[Federal Register Volume 59, Number 107 (Monday, June 6, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-13537]


[[Page Unknown]]

[Federal Register: June 6, 1994]


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DEPARTMENT OF TRANSPORTATION

Coast Guard

46 CFR Part 40 and 154

[CGD 82-058]

 

Safety Standards for Self-Propelled Vessels Carrying Bulk 
Liquefied Gases

AGENCY: Coast Guard, DOT.

ACTION: Notice of proposed rulemaking.

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SUMMARY: The Coast Guard proposes to amend its regulations concerning 
safety standards for self-propelled vessels carrying bulk liquefied 
gases. These amendments are necessary because the International 
Maritime Organization (IMO) Code on which many of these regulations are 
based has been amended. This proposal would make the changes necessary 
to align these regulations with the IMO Code and to clarify certain 
provisions in the existing regulations.

DATES: Comments must be received on or before August 5, 1994.

ADDRESSES: Comments may be mailed to the Executive Secretary, Marine 
Safety Council, (G-LRA/3406) (CGD 82-058), U.S. Coast Guard 
Headquarters, 2100 Second Street SW., Washington, DC 20593-0001, or may 
be delivered to room 3406 at the same address between 8 a.m. and 3 
p.m., Monday through Friday, except Federal holidays. The telephone 
number is (202) 267-1477. Comments on collection-of-information 
requirements must be mailed also to the Office of Information and 
Regulatory Affairs, Office of Management and Budget, 725 17th Street 
NW., Washington, DC 20503, ATTN: Desk Officer, U.S. Coast Guard.
    The Executive Secretary maintains the public docket for this 
rulemaking. Comments will become part of this docket and will be 
available for inspection or copying at room 3406, U.S. Coast Guard 
Headquarters between 8 a.m., Monday through Friday, except Federal 
holidays.
    A copy of the material listed in ``Incorporation by Reference'' of 
this preamble is available for inspection at room 1218, U.S. Coast 
Guard Headquarters.

FOR FURTHER INFORMATION CONTACT: Mr. Thomas J. Felleisen, Hazardous 
Materials Branch, Office of Marine Safety, Security and Environmental 
Protection, (202) 267-1217.

SUPPLEMENTARY INFORMATION:

Requests for Comments

    The Coast Guard encourages interested persons to participate in 
this rulemaking by submitting written data, views, or arguments. 
Persons submitting comments should include their names and addresses, 
identify this rulemaking (CGD 82-058) and the specific section of this 
proposal to which each comment applies, and give the reason for each 
comment. The Coast Guard requests that two copies of all comments and 
attachments be submitted in an unbound format, no larger than 8\1/2\ by 
11 inches, suitable for copying and electronic filing. Persons wanting 
acknowledgement of receipt of comments should enclose a stamped, self-
addressed postcard or envelope.
    The Coast Guard will consider all comments received during the 
comment period. It may change this proposal in view of the comments.
    The Coast Guard plan no public hearing. Persons may request a 
public hearing by writing to the Marine Safety Council at the address 
under ADDRESSES. The request should include reasons why a hearing would 
be beneficial. If it determines that the opportunity for oral 
presentations will aid this rulemaking, the Coat Guard will hold a 
public hearing at a time and place announced by a later notice in the 
Federal Register.

Dafting Information

    The principal persons involved in drafting this document are Mr. 
Thomas J. Felleisen, Project Manager, and Mr. Stephen H. Barber, 
Project Counsel, Office of Chief Counsel.

Background and Purpose

    On November 12, 1975, the Inter-Governmental Maritime Consultative 
Organization (now the International Maritime Organization or IMO) 
adopted the ``Code for Construction and Equipment of Ships Carring 
Liquefied Gases in Bulk'' (Gas Carrier Code), Resolution, A.328 (IX) 
without amendments. Coast Guard regulations based on this code were put 
into effect May 3, 1979 (44 25986), Since 1975, the Gas Carrier Code 
has been amended four times: April 19, 1978 (see Maritime Safety 
Committee (MSC) XXXVIII/22), May 8, 1979 (see MSC XL/26), May 20, 1980 
(see MSC/Cir. 284), and June 14, 1983 (see MSC/Cir. 356).
    IMO's amendments to the Gas Carrier Code include corrections and 
clarifications, incorporation of standards for new or novel containment 
systems, improvement of the carriage requirements for several of the 
more hazardous cargoes, expansion of the list of chemicals to which the 
code applies, and revisions to align the Gas Carrier Code with the 
``International Code for the Construction and Equipment of Ships 
Carrying Dangerous Chemicals in Bulk'' (IBC) and the ``International 
Code for the Construction and Equipment of Ships Carrying Liquefield 
Gases in Bulk'' (IGC).
    These amendments were developed by the IMO Subcommittee on Bulk 
Chemicals, the body responsible for maintenance of the Code. The Coast 
Guard actively participated in the development of these changes to the 
Gas Carrier Code by submitting position papers when the amendments were 
proposed. This rulemaking would revise the Coast Guard regulations in 
46 CFR part 154 to reflect these amendments.
    One of the most notable revisions would be the inclusion of 
standards for internal insulation tanks in new Secs. 154.454 through 
154.458, as well as in several existing sections. These standards would 
be included in order to bring the U.S. regulations for liquefied gas 
vessels in line with the Gas Carrier Code.
    Part 154 would be revised to include carriage requirements for 
seven cargoes previously regulated only under 46 CFR part 153. The 
cargoes are diethly ether, a mixture of ethylene oxide and propylene 
oxide containing not more than 30% ethylene oxide, isoprene, 
isopropylamine, monoethyamine, propylene oxide, vinyl ethyl ether, and 
vinylidene chloride. These cargoes are being added in order to bring 
the U.S. regulations for liquefied gas vessels in line with the Gas 
Carrier Code.
    Several sections of part 154 would be revised to clarify 
misinterpreted provisions. These are in Secs. 154.630, 154.901, 
154.1831, 154.1832, and 154.1834. See ``Section-by-Section Discussion 
of Proposed Changes'' for the details of each clarification.

Section-by-Section Discussion of Proposed Changes

    The following is a section by section explanation of the proposed 
changes.
    1. 46 CFR part 40 would be removed. See the discussion in this 
section of the preamble on Sec. 154.1745.
    2. Existing Sec. 154.1, Incorporation by reference, would be moved 
to new Sec. 154.8 and revised to conform to current formatting 
practices.
    3. The following sections would be revised to include requirements 
from the amended Gas Carrier Code applicable to internal insulation 
tanks: Secs. 154.7, 154.235, 154.350, 154.454 through 154.459, 154.468, 
154.615, and 154.902.
    4. The following sections would be revised to update references to 
other sections of this chapter and to incorporated material and to 
correct spelling errors: Secs. 154.12, 154.15, 154.151, 154.174, 
154.176, 154.188, 154.195, 154.420, 154.439, 154.440, 154.448, 154.471, 
154,1005, 154.1020, 154.1115, 154.1135, 154.1735, 154.1800, 154.1803, 
and 154.1820.
    5. Section 154.19 would be revised to refer to the International 
Code for the Construction and Equipment of Ships Carrying Liquefied 
Gases in Bulk and to correct the date on the Gas Carrier Code for 
Existing Ships. The correct date is 1976.
    6. Section 154.170 would be revised in accordance with an amendment 
to the Gas Carrier Code which sets the design temperature of the 
primary and secondary cargo tank barriers. Also, paragraph (a) would be 
revised to comply with present procedures for incorporating material by 
reference.
    7. Table 1 (Sec. 154.172) would be revised to align it with the Gas 
Carrier Code by including higher tensile steel grades AH, DH, and EH 
for vessels designed for prolonged exposure to low service 
temperatures. The revisions to this table also would allow the use of 
grade A steel for design temperatures of down to -5  deg.C for 
thicknesses of up to 15mm. The reference in the table to an American 
Bureau of Shipping (ABS) standard would be updated.
    8. Section 154.300 would be revised to allow category A machinery 
spaces, for example spaces for bow thruster machinery, to be located 
forward of hold spaces if specially approved by the Commandant (G-MTH).
    9. Section 154.315 would be revised to allow the Coast Guard to 
accept arrangements where the cargo pump room or cargo compressor room 
is located outside of the cargo area, as ``cargo area'' is defined in 
Sec. 154.7, if the limits of the cargo area are extended to include the 
cargo pump or compressor room and the areas below those spaces. The 
Coast Guard has accepted these arrangements in the past, but only on a 
case by case basis. In granting those acceptances, the Coast Guard used 
the same criteria that is contained in the amendments to the Gas 
Carrier Code which this notice proposes to adopt. Proposed Sec. 154.315 
continues to exceed the Gas Carrier Code in that the Gas Carrier Code 
allows cargo pump and compressor rooms to be located below the weather 
deck. The Coast Guard takes the position that locating the cargo pump 
and cargo compressor rooms on the weather deck reduces the likelihood 
of permitting vapor accumulation in those rooms. Of course, such 
arrangements would be considered under the provisions of Sec. 154.32 on 
equivalents. This is consistent with the amendments to the Gas Carrier 
Code which require special approval for specified locations of the 
cargo pump and cargo compressor rooms.
    Section 154.315 also would be revised to require that personnel 
wearing protective clothing have complete access to cargo pump and 
compressor rooms and are able to operate all valves necessary for cargo 
handling.
    10. Section 154.320 would be revised to align it with the Gas 
Carrier Code by specifying allowable openings for cargo control 
stations not having access to accommodation, service, or control 
spaces.
    11. Section 154.330 would be revised to align it with the Gas 
Carrier Code by allowing less stringent requirements for openings to 
accommodation, service, or control spaces on vessels dedicated to 
cargoes which are neither toxic nor flammable.
    12. Section 154.340 would be revised to clarify what is considered 
to be an acceptable access to gas-dangerous spaces, such as duct keels 
and ballast compartments, and also to clarify that entry into fuel oil 
tanks must not be necessary in order to perform inspections of the 
inner hull in the cargo area. These revisions correspond to amendments 
made to the Gas Carrier Code.
    13. Section 154.345 would be revised to make it clear when airlocks 
are required. The proposal also would prohibit essential electrical 
equipment which is non-explosion proof from being in a space protected 
by an airlock. This is necessary because non-explosion proof electrical 
equipment in such a space must be automatically deenergized upon 
pressure loss in the space.
    14. Section 154.350 would be revised, as was the Gas Carrier Code, 
to waive the requirement for liquid leak detection for certain spaces 
in internal insulation cargo containment systems, provided that those 
spaces are completely filled with approved insulation.
    15. Section 154.407 would be revised to designate the liquid height 
as ``ZB'' and to clarify that the definition of ZB does not 
include small tank domes which are not considered part of the accepted 
total volume of the cargo tank. This amendment is consistent with the 
Gas Carrier Code.
    16. As discussed earlier, Secs. 154.454 through 154.458 would be 
added to address the use of internal insulation tanks, as allowed by 
the amended Gas Carrier Code. The design of each of these tanks would 
be required to be approved by the Coast Guard.
    17. As stated earlier, table 3 in Sec. 154.459 would be revised to 
include requirements for internal insulation tanks.
    18. Under Sec. 154.468, information on certain properties of the 
insulation material used in internal insulation tanks would be required 
to be submitted to the Coast Guard for approval. These properties were 
added to the list of insulation properties required to be tested for 
internal insulation tanks under the Gas Carrier Code.
    19. Section 154.519 would be revised to clarify that any cargo 
piping component capable of being isolated in the liquid full condition 
must be fitted with a relief valve.
    20. Section 154.522 would be revised in accordance with the amended 
Gas Carrier Code to allow relaxations approved by the Commandant (G-
MTH) of the minimum design temperature of open ended piping inside 
cargo tanks.
    21. The table in Sec. 154.610 would be revised to raise the 
required test temperature for material in the thickness range of 30 to 
40mm from -40  deg.C to -20  deg.C, in accordance with the amended Gas 
Carrier Code.
    22. Section 154.630 would be revised to clarify that the minimum 
yield strength used in the specified calculations must be the yield 
strength of the aluminum alloy in the annealed condition. This section 
currently makes reference only to the minimum tensile strength.
    23. Section 154.901 would be revised to clearly state that the 
cargo tank atmosphere is never permitted to be in the flammable range. 
It is necessary to prevent a flammable atmosphere from developing on a 
liquefied gas vessel because there are no requirements prohibiting 
sources of ignition from being present. These vessels are designed and 
operated based on the assumption that a flammable atmosphere will never 
be present.
    24. Section 154.1110 would be revised to include storerooms 
containing high fire risk items in the area to be protected by the 
water spray system and to clarify that each area listed is required to 
be covered by at least two jets of water. These amendments are in line 
with the amended Gas Carrier Code.
    25. Section 154.1115 would be revised to include guidance for 
determining the required capacity of the water spray systems. This 
revision is based on amendments to the Gas Carrier Code.
    26. Section 154.1320 would be revised to indicate that the pressure 
referred to is the design vapor pressure and not the MARVS. This was 
also clarified in the amendments to the Gas Carrier Code.
    27. New Sec. 154.1327 would provide a formula for determining the 
maximum acceptable shutdown time once the emergency shutdown valve is 
activated. This maximum would represent the time until the tank becomes 
liquid full. This is consistent with amendments to the Gas Carrier 
Code.
    28. Section 154.1343 would be added to require the installation of 
detectors, as required in the amended Gas Carrier Code, for determining 
when a leak has occurred in the primary barrier. The detectors need 
only indicate that there is a leak. They need not be able to pinpoint 
that leak.
    29. Existing Sec. 154.1400 would be revised and Secs. 154.1401 and 
154.1402 added to clearly indicate the required safety equipment for 
all vessels and the additional equipment required for vessels carrying 
flammable and toxic cargoes. These revisions correspond to amendments 
to the Gas Carrier Code.
    30. Section 154.1405 would be revised, as was the Gas Carrier Code, 
to clearly indicate that respiratory and eye protection equipment 
intended for use as emergency escape equipment be so marked and never 
be used for fire fighting or cargo handling. This section also would 
prohibit the use of filter-type respiratory equipment.
    31. Section 154.1705 would be updated to include requirements for 
cargoes added to bring these regulations in line with the Gas Carrier 
Code.
    32. Section 154.1718 would be added to require that cargo spaces 
with submerged electric cargo pumps be inerted when any of the sever 
high vapor pressure cargoes are carried. This is required by the 
amended Gas Carrier Code.
    33. Section 154.1720 would be updated to include the new cargoes 
for which indirect refrigeration is required. This is based on 
amendments to the Gas Carrier Code.
    34. Sections 154.1721 through 154.1724 would be added to include 
requirements for separate piping systems for toxic products, flame 
screens on vent outlets, cargo tank quantity limitations, and vapor 
return connections. These requirements are based on the amended Gas 
Carrier Code.
    35. Section 154.1745 would be revised to include all of the 
requirements from 46 CFR part 40 for vinyl chloride transfer 
operations. Existing Sec. 154.1745 references part 40, but there is no 
reason to have part 40's requirements contained in a separate part. As 
part 50 addresses only vinyl chloride, this proposal would remove all 
of part 40 and transfer its requirements to part 154.
    36. Section 154.1760 would be revised to address the problem of 
stress corrosion cracking as it is addressed in the Gas Carrier Code.
    37. Section 154.1765 would be added to set forth the requirements 
for the carriage of diethyl ether and vinyl ethyl ether in accordance 
with the amended Gas Carrier Code.
    38. New Secs. 154.1770 and 154.1775 would be added to set forth the 
requirements for the carriage of propylene oxide and mixtures of 
ethylene oxide and propylene oxide which contain no more than 30% 
ethylene oxide by weight. These requirements are consistent with the 
amended Gas Carrier Code.
    39. Section 154.1818 would be revised to add new products to the 
list of products which may be carried if the shipper certifies that 
they are inhibited. This revision is in accordance with the amended Gas 
Carrier Code.
    40. Section 154.1831 would be revised to list the qualifications of 
the person in charge of cargo transfer operations. Section 155.710 of 
33 CFR, as referenced in proposed paragraph (a), was amended by a 
separate Coast Guard rulemaking (CGD 86-034; ``Hazardous Materials 
Pollution Prevention'') applying Sec. 155.710 to hazardous materials 
transfers as well as to oil transfers.
    41. Section 154.1832 would be added to clarify the necessary 
separation of cargo containment systems for incompatible cargoes. This 
section is being proposed to ensure that incompatible cargoes are not 
allowed to come in contact with each other on the vessel.
    42. Section 154.1834 would be revised to clarify the 
responsibilities of the person in charge of cargo transfer operations 
to ensure that the proper piping is used and to ensure that cargo 
vapors are properly handled.
    43. Section 154.1850 would be revised to focus attention on the 
special problems caused by the gas absorbing qualities of internal 
insulation materials. This is in accordance with the amended Gas 
Carrier Code.
    44. Section 154.1870 would be revised to update the list of cargoes 
which are prohibited from being transferred via bow or stern loading 
piping. This revision is based on the amendments to the Gas Carrier 
Code.
    45. Section 154.7 and the table 4 following existing Sec. 154.1872 
would be revised to include the minimum requirements for the new 
cargoes added in accordance with the amended Gas Carrier Code and to 
update existing requirements and references.

Incorporation by Reference

    The following material would be incorporated by reference in 
Sec. 154.8:

American Bureau of Shipping (ABS) Rules for Building and Classing Steel 
Vessels, 1992.
American National Standards Institute (ANSI) Z87.1-1989 Practice for 
Occupational and Educational Eye and Face Protection, 1989.
ANSI Z89.1-1986 Protective Headwear for Workers, 1986.
American Society for Testing and Materials (ASTM) A 20/A 20M-92a 
Standard Specifications for General Requirements for Steel Plates for 
Pressure Vessels, 1992.
ASTM F1017-92 Standard Specification for Flashlights on Vessels, 1992.
International Maritime Organization (IMO) Code for the Construction and 
Equipment of Ships Carrying Liquefied Gases in Bulk, 1975, as amended 
(1983 edition).
IMO Code for Existing Ships Carrying Liquefied Gases in Bulk, 1976.
IMO International Code for the Construction and Equipment of Ships 
Carrying Liquefied Gases in Bulk, 1983.
IMO Medical First Aid Guide for Use in Accidents Involving Dangerous 
Goods.
IMO Resolution A.328, Code for the Construction and Equipment of Ships 
Carrying Liquefied Gases in Bulk, 1975.
Underwriters Laboratories, Inc. (UL) No. 783, Standard for Electric 
Flashlights and Lanterns for Use in Hazardous (Classified) Locations, 
1993.

    Copies of the material are available for inspection where indicated 
under ADDRESSES. Copies of the material are available from the sources 
listed in Sec. 154.8.
    Before publishing a final, the Coast Guard will submit this 
material to the Director of the Federal Register for approval of the 
incorporation by reference.

Regulatory Evaluation

    This proposal is not a significant regulatory action under section 
3(f) of Executive Order 12866 and does not require an assessment of 
potential costs and benefits under section 6(a)(3) of that order. It 
has not been reviewed by the Office of Management and Budget. It is not 
significant under the Department of Transportation (DOT) regulatory 
policies and procedures (44 FR 11040; February 26, 1979). The Coast 
Guard expects the economic impact of this proposal to be so minimal 
that a full Regulatory Evaluation under paragraphs 10e of the DOT 
regulatory policies and procedures is unnecessary.
    These proposed regulations would apply only to ``new gas vessels'', 
as the term is defined in Sec. 154.7. No currently operating ``new gas 
vessels'' would be affected. There are presently no U.S. flag ``new gas 
vessels'', and currently operating foreign ``new gas vessels'' already 
meet the similar requirements of the Gas Carrier Code.
    The impact of this proposal on U.S. flag vessels constructed in the 
future is also anticipated to be minimal, because the major part of 
this proposal allows for the carriage of cargoes previously required to 
be carried on chemical tankers and for the addition of an alternative, 
less expensive, cargo containment system.
    As stated above, the impact on foreign flag vessels built in the 
future will continue to be minimal because these vessels will already 
comply with the requirements of the Gas Carrier Code.

Small Entities

    Under the Regulatory Flexibility Act (5 U.S.C. 501 et seq.), the 
Coast Guard must consider whether this proposal, if adopted, will have 
a significant economic impact on a substantial number of small 
entities. ``Small entities'' may include (1) small businesses and not-
for-profit organizations that are independently owned and operated and 
are not dominant in their fields and (2) governmental jurisdictions 
with populations of less than 50,000.
    These proposals would apply only to liquefied gas vessels, all of 
which are large in size and owned by large corporations.
    Therefore, the Coast Guard certifies under 5 U.S.C. 605(b) that 
this proposal, if adopted, will not have a significant economic impact 
on a substantial number of small entities. If, however, you think that 
your business or organization qualifies as a small entity and that this 
proposal will have a significant economic impact on your business or 
organization, please submit a comment (see ADDRESSES) explaining why 
you think it qualifies and in what way and to what degree this proposal 
will economically affect it.

Collection of Information

    Under the Paperwork Reduction Act (44 U.S.C. 3501 et seq.), the 
Office of Management and Budget (OMB) reviews each proposed rule that 
contains a collection-of-information requirement to determine whether 
the practical value of the information is worth the burden imposed by 
its collection. Collection-of-information requirements include 
reporting, recordkeeping, notification, and other, similar 
requirements.
    This proposal contains collection-of-information requirements in 
the following section: Sec. 154.15. The following particulars apply:

DOT No: 2115.
OMB Control No: 2115-0113.
Administration: U.S. Coast Guard.
Title: Safety Standards for Self-Propelled Vessels Carrying Bulk 
Liquefied Gases.
Need for Information: To prevent the uncontrolled release of cargo by 
liquefied gas carriers.
Proposed Use of Information: To verify compliance with safety 
regulations.
Frequency of Response: 1 per respondent per year.
Burden Estimate: 10 hours per year.
Respondents: Designers of cargo containment systems; eight worldwide
Form(s): No specific forms. Information supplied from existing plans 
and drawings used for designing a cargo containment system.
Average Burden Per Respondent: 10 hours per year.

    The Coast Guard has submitted the requirements to OMB for review 
under section 3504(h) of the Paperwork Reduction Act. Persons 
submitting comments on the requirements should submit their comments 
both to OMB and to the Coast Guard where indicated under ADDRESSES.

Federalism

    The Coast Guard has analyzed this proposal under the principles and 
criteria contain in Executive Order 12612 and has determined that this 
proposal does not have sufficient federalism implications to warrant 
the preparation of a Federalism Assessment.

Environment

    The Coast Guard considered the environmental impact of this 
proposal and concluded that, under paragraph 2.B.2 of Commandant 
Instruction M16475.1B, this proposal is categorically excluded from 
further environmental documentation. There is no environmental impact 
associated with these expanded safety requirements. A ``Categorical 
Exclusion Determination'' is available in the docket for inspection or 
copying where indicated under ADDRESSES.

List of Subjects

46 CFR Part 40

    Cargo vessels, Hazardous materials transportation, Marine safety, 
Occupational safety and health, Seamen, Vinyl chloride.

46 CFR Part 154

    Cargo vessels, Gases, Hazardous materials transportation, Marine 
safety, Reporting and recordkeeping requirements.

    For the reasons set out in the preamble, the Coast Guard proposes 
to amend 46 CFR parts 40, and 154 as follows:

PART 40--[REMOVED AND RESERVED]

    1. Part 40 is removed and reserved.

PART 154--SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK 
LIQUEFIED GASES

    2. The authority citation for part 154 continues to read as 
follows:

    Authority: 46 U.S.C. 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 
Comp., p. 277; 49 CFR 1.46.


Sec. 154.1  [Removed]

    3. Section 154.1, Incorporation by reference, is removed.
    4. In Sec. 154.7, revise the section heading, and the introductory 
text and paragraph (a) of the definition for ``Gas-dangerous space''; 
remove from the list under the definitions of ``Flammable cargoes'' and 
``Toxic cargoes'' the word ``Ethylamine''; add, in alphabetical order, 
to the list under ``Flammable cargoes'', the cargoes ``Diethyl ether'', 
``Propylene oxide-ethylene oxide mixture'', ``Isoprene'', 
``Isopropylamine'', ``Monoethylamine'', ``Propylene oxide'', ``Vinyl 
ethyl ether'', and ``Vinylidene chloride''; add, in alphabetical order, 
to the list under ``Toxic cargoes'', the cargoes ``Diethyl ether'', 
``Propylene oxide-ethylene oxide mixture'', ``Isopropylamine'', 
``Monoethylamine'', ``Propylene oxide'', ``Vinyl ethyl ether'', and 
``Vinylidene chloride''; and add definitions for the words ``Boil-off 
gas'', ``Category A machinery space'', ``Internal insulation tank'', 
``Membrane'', and ``Oil fuel unit'' to read as follows:


Sec. 154.7  Definitions and abbreviations.

* * * * *
    Boil-off gas means the vapor produced by cargo evaporation at 
ambient temperatures of 45  deg.C still air and 32  deg.C still water.
* * * * *
    Category A machinery space means Category A machinery space as 
defined in Sec. 30.10-6a of this chapter.
* * * * *
    Gas-dangerous space means a space where gas may be present and 
includes the following spaces:
    (a) A space in the cargo area which is not arranged or equipped in 
a manner to ensure that the space's atmosphere is maintained at all 
times in a gas safe condition.
* * * * *
    Internal insulation tank means a non-self supporting cargo tank 
consisting of thermal insulation materials which contribute to cargo 
containment and which are supported by the structure of the adjacent 
inner hull or of an independent tank.
* * * * *
    Membrane means a non-self supporting metallic, nonmetallic or 
composite material that is liquid tight and no thicker than 10 mm 
(0.394 in).
* * * * *
    Oil fuel unit means a unit as defined in Sec. 30.10-48a of this 
chapter.
* * * * *
    5. Section 154.8 is added to read as follows:


Sec. 154.8  Incorporation by reference.

    (a) Certain material is incorporated by reference into this part 
with the approval of the Director of the Federal Register under 5 
U.S.C. 552(a) and 1 CFR part 51. To enforce any edition other than that 
specified in paragraph (b) of this section, the Coast Guard must 
publish notice of change in the Federal Register, and the material must 
be available to the public. All approved material is available for 
inspection at the Office of the Federal Register, 800 North Capitol 
Street NW., suite 700, Washington, DC, and at U.S. Coast Guard, Marine 
Technical and Hazardous Materials Division, room 1218, 2100 Second 
Street SW., Washington, DC 20593-0001, and is available from the 
sources indicated in paragraph (b) of this section.
    (b) The material approved for incorporation by reference in this 
part and the sections affected are as follows:

American Bureau of Shipping (ABS):                                                                              
  Two World Trade Center, 106th Floor, New York, NY 10048. Rules for                                            
   Building and Classing                                                                                        
  Steel Vessels, 1992................................................  154.170; 154.172; 154.174; 154.176;      
                                                                        154.188; 154.195; 154.420; 154.421;     
                                                                        154.439; 154.440.                       
American National Standards Institute (ANSI):                                                                   
  1430 Broadway, New York, NY 10018.                                                                            
  ANSI Z87.1-1989, Practice for Occupational and Educational Eye and   154.1400; 154.1401; 154.1402.            
   Face Protection, 1989.                                                                                       
  ANSI Z89.1-86, Protective Headwear for Workers, 1986...............  154.1400; 154.1401; 154.1402.            
American Society for Testing and Materials (ASTM):                                                              
  1916 Race Street, Philadelphia, PA 19103.                                                                     
  A 20/A 20M-92a, Standard Specification for General Requirements for  154.610.                                 
   Steel Plates for Pressure Vessels, 1992.                                                                     
  ASTM F 1014-92, Standard Specification for Flashlights on Vessels,   154.1400.                                
   1992.                                                                                                        
International Maritime Organization:                                                                            
  4 Albert Embankment, London SE1 75R, U.K.                                                                     
  Code for the Construction and Equipment of Ships Carrying Liquefied  154.19.                                  
   Gases in Bulk, 1975, as amended (1983 edition).                                                              
  Code for Existing Ships Carrying Liquefied Gases in Bulk, 1976.....  154.19; 154.24.                          
  International Code for the Construction and Equipment of Ships       154.19.                                  
   Carrying Liquefied Gases in Bulk, 1983.                                                                      
  Medical First Aid Guide for Use in Accidents Involving Dangerous     154.1435; 154.1440.                      
   Goods.                                                                                                       
  Resolution A. 328, Code for the Construction and Equipment of Ships  154.24.                                  
   Carrying Liquefied Gases in Bulk, 1975.                                                                      
Underwriters Laboratories, Inc.:                                                                                
  333 Pfingsten Rd., Northbrook, IL 60062.                                                                      
  UL No. 783 Standard for Electric Flashlights and Lanterns for Use    154.1400; 154.1401; 154.1402.            
   in Hazardous (Classified) Locations, 1993.                                                                   
                                                                                                                

    6. In Sec. 154.12, paragraphs (e)(2), (4), (7), and (26) are 
revised to read as follows:


Sec. 154.12  Existing gas vessel: Endorsements and requirements.

* * * * *
    (e) * * *
    (2) Section 154.320 (b) and (d).
* * * * *
    (4) Section 154.340(e).
* * * * *
    (7) Section 154.519(b)(2).
* * * * *
    (26) Sections 154.1110 through 154.1130, except Secs. 154.1115(c), 
154.1120(b), and 154.1125 (c) and (f).
* * * * *
    7. In Sec. 154.15, paragraph (b)(1) is revised to read as follows:


Sec. 154.15  U.S. flag vessel; Endorsement application.

* * * * *
    (b) * * *
    (1) Calculations for hull design required by part 172, subpart G, 
of this chapter;
* * * * *
    8. In Sec. 154.19, paragraph (a) is revised to read as follows:


Sec. 154.19  U.S. flag vessel: IMO certificate issuance.

    (a) The Coast Guard Officer in Charge, Marine Inspection, issues an 
IMO Certificate to a U.S. flag vessel, when requested by the owner or 
representative, if the vessel meets the requirements of this part and--
    (1) For a gas vessel the construction of which began on or after 
July 1, 1986, meets the International Code for the Construction and 
Equipment of Ships Carrying Liquefied Gases in Bulk;
    (2) For a gas vessel contracted for construction on or after 
October 31, 1976 and constructed before July 1, 1986, meets the Code 
for the Construction and Equipment of Ships Carrying Liquefied Gases in 
Bulk, 1975, as amended (1983 edition); or
    (3) For a gas vessel constructed before October 31, 1976, meets the 
Code for Existing Ships Carrying Liquefied Gases in Bulk.
* * * * *

Subpart B  [Amended]

    9. The heading to subpart B is revised to read ``Subpart B--
Inspections''.


Sec. 154.151  [Amended]

    10. In Sec. 154.151(c) introductory text, remove ``Sec. 154.5(b)'' 
and add, in its place, ``Sec. 154.22(b)''.
    11. In Sec. 154.170, in paragraph (a), remove the words after 
``material standards'' and add, in their place, the words ``in Rules 
for Building and Classing Steel Vessels''; and revise paragraphs 
(b)(3)(ii) and (b)(3)(iii) to read as follows:


Sec. 154.170  Outer hull steel plating.

* * * * *
    (b) * * *
    (3) * * *
    (ii) For cargo containment systems with secondary barriers, the 
temperature of the secondary barrier is the cargo boiling temperature 
at atmospheric pressure; and
    (iii) For cargo containment systems without secondary barriers, the 
temperature of the primary barrier is the cargo carriage temperature.
    12. Following Sec. 154.172, by revising table 1 to read as follows:


Sec. 154.172  Contiguous steel hull structure.

* * * * * 

Table 1.--Minimum Temperature, Thickness, and Steel Grades in Contiguous
                            Hull Structures                             
------------------------------------------------------------------------
     Minimum             Maximum thickness (mm) for steel grades        
  temperature (  -------------------------------------------------------
     deg.C)         A       B       D       3       AH      DH      EH  
------------------------------------------------------------------------
0 and above ....    ``Rules for Building and Classing Steel Vessels''   
-5 and below -0.      15      25      30      50      25      45      50
-10 and below -5       X      20      25      50      20      40      50
-20 and below -                                                         
 10.............       X       X      20      50       X      30      50
-30 and below -                                                         
 20.............       X       X       X      40       X      20      40
Below -30 ......       In accordance with Sec. 154.615 of this part     
------------------------------------------------------------------------
``X'' means steel grade is not used.                                    

Secs. 154.174, 154.176, 154.188, and 154.195  [Amended]

    13. In Secs. 154.174(a), 154.176(a), 154.188, and 154.195(b), 
remove the words ``of the American Bureau of Shipping published in 
``Rules for Building and Classing Steel Vessels '', 1981'' and add, in 
their place, the words ``in Rules for Building and Classing Steel 
Vessels''.
    14. In Sec. 154.235, redesignate paragraph (d) as paragraph (e) and 
add a new paragraph (d) to read as follows:


Sec. 154.235  Cargo tank location.

* * * * *
    (d) In vessels having internal insulation tanks, the extent of 
damage must be measured to the supporting tank plating.
* * * * *
    15. In Sec. 154.300, redesignate the introductory text and 
paragraphs (a), (b), and (c) as paragraphs (a), (a)(1), (a)(2), and 
(a)(3), respectively, and add a new paragraph (b) to read as follows:


Sec. 154.300  Segregation of hold spaces from other spaces.

* * * * *
    (b) Hold spaces must be located forward of Category A machinery 
spaces, unless specially approved by the Commandant (G-MTH).
    16. In Sec. 154.315, revise paragraph (a); redesignate paragraph 
(b) as paragraph (f); and add new paragraphs (b), (c), (d), (e), (g), 
and (h) to read as follows:


Sec. 154.315  Cargo pump and cargo compressor rooms.

    (a) Cargo pump rooms and cargo compressor rooms must be located 
above the weather deck.
    (b) Cargo pump rooms and cargo compressor rooms must be located 
between the after end of the aftermost hold space and the forward end 
of the forwardmost hold space, unless otherwise permitted by the 
Commandant (G-MTH).
    (c) When cargo compressor rooms are permitted under paragraph (b) 
of this section to be located at the after end of the aftermost hold 
space or at the forward end of the forwardmost hold space, the limits 
of the cargo area must be extended to include the cargo pump rooms and 
the cargo compressor rooms for the full beam and depth of the ship.
    (d) Where the limits of the cargo area are extended under paragraph 
(c) of this section, the bulkhead which separates the cargo pump rooms 
or cargo compressor rooms from accommodation, service, or control 
spaces or Category A machinery spaces must be located so as to prevent 
gas from entering these spaces through a single failure of a bulkhead.
    (e) For the purposes of fire protection, cargo compressor rooms are 
treated as cargo pump rooms.
    (f) * * *
    (g) Cargo pump rooms and cargo compressor rooms must be arranged to 
allow unrestricted access by personnel wearing protective clothing and, 
in the event of injury, to allow unconscious personnel to be removed.
    (h) All valves necessary for cargo handling must be readily 
accessible to personnel wearing protective clothing.
    17. In Sec. 154.320, redesignate paragraph (c) as paragraph (d) and 
add a new paragraph (c) to read as follows:


Sec. 154.320  Cargo control stations.

* * * * *
    (c) If a cargo control station has no access to an accommodation, 
service or control space, the openings from the cargo area must comply 
with Sec. 154.345.
* * * * *
    18. In Sec. 154.330, paragraph (g) is added to read as follows:


Sec. 154.330  Openings to accommodation, service, or control spaces.

* * * * *
    (g) Vessels dedicated to cargoes which are neither toxic nor 
flammable may have openings to accommodation, service, or control 
spaces which do not meet the requirements of paragraphs (a) through (f) 
of this section, if specially approved by the Commandant (G-MTH).
    19. In Sec. 154.340, revise the introductory text of paragraph (b); 
redesignate paragraphs (c), (d), (e), and (f), as paragraphs (d), (e), 
(f), and (g), respectively; revise redesignated paragraph (f); and add 
a new paragraph (c) to read as follows:


Sec. 154.340  Access to tanks and spaces in the cargo area.

* * * * *
    (b) Each access into or through a void space or other gas-dangerous 
space in the cargo area, except for spaces separated by a single 
gastight boundary from a hold or a space with a secondary barrier, must 
-- * * *.
    (c) Spaces separated by a single gastight boundary from a hold or a 
space with a secondary barrier must be provided with either a direct 
access from the weather deck or an indirect access from the weather 
deck which does not include an enclosed gas-safe space.
* * * * *
    (f) The inner hull in the cargo area must be accessible for 
inspection from at least one side without the removal of any fixed 
structure or fitting. If a visual inspection is possible only at the 
outer face of the inner hull, the inner hull must not be a fuel oil 
tank boundary wall.
* * * * *
    20. In Sec. 154.345, revise paragraph (a) and add paragraph (d) to 
read as follows:


Sec. 154.345  Air locks.

    (a) Access through doors, gas tight or otherwise, is not permitted 
from a gas-safe space to a gas-dangerous space; except that, access to 
service spaces forward of the cargo area through air locks, under this 
section, which open on the weatherdeck, may be permitted when 
accommodation spaces are aft.
* * * * *
    (d) Emergency fire pumps and non-explosion proof electrical 
equipment for maneuvering, anchoring, or mooring the vessel must not be 
located in spaces protected by air locks.
    21. In Sec. 154.350, revise the section heading; redesignate 
paragraph (d) as paragraph (e); add new paragraphs (d) and (f); and 
revise redesignated paragraph (e) to read as follows:


Sec. 154.350  Bilge, ballast, and fuel oil systems in the cargo area.

* * * * *
    (d) For internal insulation tanks, paragraphs (a), (b), and (c) of 
this section do not apply to the following spaces, provided that the 
spaces are completely filled with insulation approved under 
Sec. 154.467:
    (1) Interbarrier spaces.
    (2) Spaces between the secondary barrier and the inner hull.
    (3) Spaces between the secondary barrier and independent tank 
structures.
    (e) Spaces in the cargo containment portion of the vessel, except 
ballast spaces and gas-safe spaces, must not connect to pumps in the 
main machinery space. Pump vents must not be open to machinery spaces.
    (f) Duct keels may be connected to pumps in the machinery space 
if--
    (1) The connections are led directly to the pumps;
    (2) The discharge from the pumps is led directly overboard; and
    (3) There are no valves or manifolds in either line which could 
connect the line from the duct keel to lines serving gas-safe spaces.
    22. In Sec. 154.407(a), remove ``Z8'' wherever it appears and 
add, in its place, ``ZB'' and revise the definition of ``ZB'' 
to read as follows:


Sec. 154.407  Cargo tank internal pressure head.

    (a) * * *
    ``ZB'' = largest liquid height (m) above the point where the 
pressure is to be determined in the  direction (see figure 2). 
Small tank domes not considered to be part of the accepted total volume 
of the cargo tank need not be considered when determining ``ZB'';
* * * * *


Secs. 154.420 and 154.439  [Amended]

    23. In Sec. 154.420(a) and Sec. 154.439 introductory text, remove 
the words ``of the American Bureau of Shipping published in ``Rules for 
Building and Classing Steel Vessels'', 1981'' and add, in their place, 
the words ``in Rules for Building and Classing Steel Vessels.''


Sec. 154.421  [Amended]

    24. In Sec. 154.421, remove ``, 1981''.
    25. In 154.440, paragraph (c) is revised to read as follows:


Sec. 154.440  Allowable stress.

* * * * *
    (c) For an internal pressure head that meets Sec. 154.439(a), tank 
plating must meet the deep tank standards in Rules for Building and 
Classing Steel Vessels.


Sec. 154.448  [Amended]

    26. In Sec. 154.448(b), remove the word ``its'' before the word 
``support''.
    27. Before the undesignated heading ``SECONDARY BARRIER'', add a 
new undesignated heading and Secs. 154.454 through 154.458 to read as 
follows:

Internal Insulation Tanks


Sec. 154.454  General.

    (a) The design of an internal insulation tank and its supporting 
hull structure or independent tank structure must be specially approved 
by the Commandant (G-MTH).
    (b) Internal insulation tanks must be made of materials that 
withstand the combined strains calculated under Sec. 154.457(a).


Sec. 154.455  Design vapor pressure.

    The design vapor pressure (P deg.) of an internal insulation tank 
must not exceed 25.4 kPa gauge (3.55 psig). For internal insulation 
tanks supported by the hull structure, the Commandant (G-MTH) may 
specially approve a P deg. between 24.5 kPa gauge (3.55 psig) and 69 
kPa gauge (10 psig). For internal insulation tanks supported by 
independent tank structures, the Commandant (G-MTH) may specifically 
approve a P deg. greater than 69 kPa gauge (10 psig).


Sec. 154.456  Internal insulation tank system design.

    An internal insulation tank must be designed for the following:
    (a) Any static and dynamic loads with respect to--
    (1) Fatigue failure;
    (2) Crack propagation from both free and supported surfaces;
    (3) Adhesive and cohesive strength;
    (4) Compressive, tensile, and sheer strength; and
    (5) Water ballast in spaces adjacent to the inner hull forming the 
supporting structure of the internal insulation tank.
    (b) Combined strains from static, dynamic, and thermal loads.
    (c) Compatibility of the tank insulation material with the 
deflections of the vessel's inner hull or independent tank structures.


Sec. 154.457  Calculations.

    The tank design load calculations for an internal insulation tank 
must include the following:
    (a) The combined strains from static, dynamic, and thermal loads.
    (b) The response of the internal insulation tank, its cargo, its 
supporting structures, and any ballast adjacent to the supporting 
structure of the internal insulation tank to the vessel motion and 
acceleration under worst weather conditions. Calculations for a similar 
vessel may be submitted to meet the requirements of this paragraph.
    (c) Plastic deformation and fatigue life resulting from static and 
dynamic loads in the insulation and in the supporting hull structure or 
independent tank structure.


Sec. 154.458  Model test.

    (a) A test must be performed to determine whether the primary and 
secondary barriers of an internal insulation tank, including corners, 
joints, pump mounts, piping penetrations, and other critical areas, are 
capable of withstanding the combined strains from the static, dynamic, 
and thermal loads calculated under Sec. 154.457(a).
    (b) Combined tension and fatigue tests must be performed to 
evaluate crack behavior of the insulation material in the event a 
through crack develops in the inner hull or independent tank structure.
    (c) Analyzed data from the tests under paragraphs (a) and (b) of 
this section must be submitted to the Commandant (G-MTH) for 
acceptance.
    28. In Sec. 154.459, add a new entry and new footnotes to table 3 
to read as follows:


Sec. 154.459  General.

* * * * *

                                                         Table 3.--Secondary Barriers for Tanks                                                         
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                    Cargo temperature (T) at atmospheric pressure                                       
         Tank type         -----------------------------------------------------------------------------------------------------------------------------
                               T-10 deg.C(14 deg.F)       T<-10 deg.C(14 deg.F)-55 deg.C(-67 deg.F)       T<-55 deg.C(-67 deg.F)  
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                                        
                                                                      * * * * * * *                                                                     
Internal insulation:                                                                                                                                    
Type 1\2\.................  ......do............................  Complete secondary barrier...............................  Complete secondary barrier.
Type 2\3\.................  ......do............................  Complete secondary barrier is incorporated...............  Complete secondary barrier 
                                                                                                                              is incorporated.          
--------------------------------------------------------------------------------------------------------------------------------------------------------
* * * * *                                                                                                                                               
\2\Type 1 tanks are tanks in which insulation or a combination of the insulation and one or more liners* function as a primary barrier. The inner hull  
  or independent tank structure functions as the secondary barrier when required.                                                                       
\3\Type 2 tanks are tanks in which the insulation or a combination of the insulation and one or more liners* function as both the primary and secondary 
  barrier, and where these barriers are clearly distinguishable.                                                                                        
*A liner, as used in footnotes 2 and 3, means a thin, non-self supporting metallic, nonmetallic or composite material which forms part of an internal   
  insulation tank in order to enhance its fracture resistance or other mechanical properties. A liner differs from a membrane in that a liner is not    
  intended by itself to function as a liquid barrier.                                                                                                   

    29. Before the undesignated heading ``SUPPORT SYSTEM'', add 
Sec. 154.464 to read as follows:


Sec. 154.468  Submission of insulation information for internal 
insulation tanks.

    (a) In addition to the information required in Sec. 154.467, 
information on the following properties of the insulation materials 
which contribute to cargo containment in internal insulation tanks must 
be submitted to the Commandant (G-MTH) for special approval:
    (1) Bonding (adhesive and cohesive strength).
    (2) Resistance to cargo pressure.
    (3) Fatigue and crack propagation.
    (4) Compatibility with cargo constituencies and with any other 
agency normally expected to come in contact with the insulation.
    (5) Gas desorbing.
    (b) The influence of the presence of water and water pressure on 
the insulation properties must be taken into account.
    (c) The properties listed in paragraph (a) of this section must 
be--
    (1) Obtained after simulation of aging and thermal cycling; and
    (2) Tested for in the temperature range between the expected 
maximum temperature in service and 5  deg.C (8  deg.F) below the 
minimum design temperature, but no lower than -196  deg.C (-321 
deg.F).
    30. Section 154.471(a)(3) is revised to read as follows:


Sec. 154.471  Design criteria.

    (a) * * *
    (3) To withstand a collision force, in the forward direction, equal 
to at least one-half of the weight of the cargo tank and cargo and, in 
the aft direction, equal to at least one-quarter of the weight of the 
cargo tank and cargo; and
* * * * *
    31. In Sec. 154.519, paragraph (c) is added to read as follows:


Sec. 154.519  Piping relief valves.

* * * * *
    (c) All pipelines or components which may be isolated in a liquid 
full condition must have a relief valve.
    32. In Sec. 154.522(a), revise the introductory test to read as 
follows:


Sec. 154.522  Materials for piping.

    (a) The materials for piping systems must meet Sec. 154.625 for the 
minimum design temperature of the piping; except that, the material for 
open-ended vent piping, open-ended piping inside the cargo tanks 
(excluding discharge piping), and all piping inside membrane and 
semimembrane tanks may be specially approved by the Commandant (G-MTH) 
if--
* * * * *
    33. In Sec. 154.610, in paragraph (c), remove ``ASTM A-20-75'' and 
add, in its place, ``ASTM A 20/A 20 M-83'' and, in paragraph (i), 
revise the table to read as follows:


Sec. 154.610  Design temperature not colder than 0 deg.C (32 deg.F)

* * * * *
    (i) * * *

------------------------------------------------------------------------
                  Material thickness                    Test temperature
------------------------------------------------------------------------
t  20 mm (0.788 in.)......................  0 deg.C (32      
                                                        deg.F)          
20 < t  40 mm (1.576 in.).................  -20 deg.C (-4    
                                                        deg.F)          
------------------------------------------------------------------------

    34. In Sec. 154.615, designate the text as paragraph (a) and add a 
new paragraph (b) to read as follows:


Sec. 154.615  Design temperature below 0 deg.C (32 deg.F) and down to 
-55 deg.C (-67 deg.F).

* * * * *
    (b) Insulation materials forming a secondary barrier must be 
approved under Sec. 154.468.
    35. In Sec. 154.630, paragraph (b) is revised to read as follows:


Sec. 154.630  Cargo tank material.

* * * * *
    (b) For aluminum alloy cargo tanks with welded connections, the 
minimum yield strength (Y) and the minimum tensile 
strength (B) for the calculations under Secs. 154.440, 
154.447, and 154.450 must be the minimum respective value of the alloy 
in an annealed condition.
* * * * *
    36. In Sec. 154.901(c), add a sentence at the end of the paragraph 
to read as follows:


Sec. 154.901  Atmospheric control within cargo tanks and cargo piping 
systems.

* * * * *
    (c) * * *. No flammable mixture is permitted at any time within the 
cargo tank.
* * * * *
    37. In Sec. 154.902, paragraph (e) is added to read as follows:


Sec. 154.902  Atmospheric control within hold and interbarrier spaces.

* * * * *
    (e) For internal insulation tanks, atmospheric control is not 
required for interbarrier spaces and spaces between the secondary 
barrier and the inner hull or independent tank structures which are 
completely filled with insulation approved under Sec. 154.468
    38. In Sec. 154.1005, paragraphs (c) and (d) are revised to read as 
follows:


Sec. 154.1005  Equipment approval.

* * * * *
    (c) Electrical equipment that is required to be intrinsically safe 
under Sec. 154.1010 must comply with Sec. 111.105-11 of this chapter.
    (d) Electrical equipment that is required to be explosion proof 
under Sec. 154.1010 must comply with Sec. 111.105-9 of this chapter.


Sec. 154.1020  [Amended]

    39. In Sec. 154.1020, remove ``Sec. 154.230(a)'' and add, in its 
place ``Sec. 154.200''.
    40. In Sec. 154.1110, redesignate the introductory text and 
paragraphs (a) through (h) as paragraphs (a) and (a)(1) through (a)(8), 
respectively; revise redesignated paragraphs (a)(6) and (a)(7); and add 
paragraphs (b) and (c) to read as follows:


Sec. 154.1110  Areas protected by system.

    (a) * * *
    (6) Each boundary facing the cargo area of each superstructure that 
contains storerooms containing high fire risk items or accommodation, 
service, or control spaces;
    (7) Each boundary facing the cargo area of each deckhouse that 
contains storerooms containing high fire risk items or accommodation, 
service, or control spaces; and
* * * * *
    (b) Every area under paragraph (a) of this section also must be 
covered by at least two jets of water from the fire main system.
    (c) Boundaries of unmanned forecastle structures not containing 
high fire risk items or equipment do not require water spray protection
    41. In Sec. 154.1115, redesignate paragraph (b) as paragraph (c); 
add a new paragraph (b); and revise redesignated paragraph (c) to read 
as follows:


Sec. 154.1115  Discharge.

* * * * *
    (b) For structures not having clearly defined horizontal or 
vertical surfaces, the capacity of the water spray system must be 
determined by the greater of the following;
    (1) The projected horizontal surface multiplied by 10,000 cm\3\/
m\2\/min (0.25 gpm/ft.\2\).
    (2) The actual surface multiplied by 4,000 cm\3\/m\2\/min (0.10 
gpm/ft.\2\).
    (c) The water spray protection under Sec. 154.1110 (a)(4) and 
(a)(5) must cover an area in a horizontal plane extending at least 0.5 
m (19 in.) in each direction from the pipes, fittings, and valves or 
must cover the area of the drip tray, whichever is greater.
    42. In Sec. 154.1135, paragraphs (d)(1) and (d)(2) are revised to 
read as follows:


Sec. 154.1135  Pumps.

* * * * *
    (d) * * *
    (1) The areas in Secs. 154.1110 (a)(6) through (a)(8) and 
154.1115(c); and
    (2) The largest section that includes the required protection under 
Sec. 154.1110(a)(1), (a)(2), and (a)(3).
    43. In Sec. 154.1320, paragraph (a)(1) is revised to read as 
follows:


Sec. 154.1320  Sighting ports, tubular gauge glasses, and flat plate 
type gauge glasses.

    (a) * * *
    (1) The tank has a design vapor pressure that is less than 69 kPa 
gauge (10 psig);
* * * * *
    44. Section 154.1327 is added to read as follows:


Sec. 154.1327  Valve closing time.

    (a) The closing time (i.e. the time from shutdown signal initiation 
to complete valve closure) of valves under Sec. 154.1325 must not be 
greater than--

TP06JN94.000

U=ullage volume at operating signal level m\3\.
LR=maximum loading rate agreed on m\3\/h.

    (b) The loading rate must be adjusted to limit the surge pressure 
on valve closure to an acceptable level.
    45. Section 154.1343 is added to read as follows:


Sec. 154.1343  Leak detection.

    (a) All cargo containment systems requiring a secondary barrier 
must be provided with permanently installed instrumentation to detect--
    (1) Failure of the primary barrier to be liquid tight at any 
location; or
    (2) Contact of liquid cargo with the secondary barrier at any 
location.
    (b) The instrumentation required in paragraph (a) of this section 
must be the appropriate gas detection equipment under Sec. 154.1345 and 
need not be capable of detecting the exact location of the leak.
    46. Section 154.1400 is revised to read as follows:


Sec. 154.1400  Safety equipment; All vessels.

    (a) Instead of the equipment under Sec. 35.30-20 of this chapter, 
each vessel must have two fireman's outfits and two sets of personnel 
safety equipment on board.
    (b) Each fireman's outfit must consist of the following:
    (1) A pressure-demand, open circuit, self-contained breathing 
apparatus approved by the Mining Safety and Health Administration 
(MSHA) and by the National Institute for Occupational Safety and Health 
(NIOSH), and having at a minimum a 30 minute air supply and a full 
facepiece.
    (2) A steel-cored lifeline.
    (3) A three-cell, explosion proof flashlight manufactured to UL No. 
783-79 with an Underwriters' Laboratories label for Class I, Division 
1, and the Electrical Hazard Group listed in table 4 of this part for 
each cargo carried.
    (4) A fire axe.
    (5) A helmet that meets ANSI Z89.1-86.
    (6) A set of boots and gloves that are made of rubber or other 
electrically non-conductive material.
    (7) A set of goggles that meets ANSI Z87.179.
    (8) An outfit that protects the skin from scalding steam and the 
heat of fire and that has a water resistant outer surface.
    (c) Each set of personnel safety equipment must consist of the 
following:
    (1) A pressure-demand, open circuit, self-contained breathing 
apparatus approved by the Mining Safety and Health Administration 
(MSHA) and by the National Institute for Occupational Safety and Health 
(NIOSH), and having at a minimum a 30 minute air supply and a full 
facepiece.
    (2) A steel-cored lifeline.
    (3) A three-cell, explosion proof flashlight manufactured to UL No. 
783-79 with an Underwriters' Laboratories label for Class I, Division 
1, and the Electrical Hazard Group listed in table 4 of this part for 
each cargo carried.
    (4) A helmet that meets ANSI Z89.1-86.
    (5) A set of boots and gloves that are made of rubber or other 
electrically non-conductive material.
    (6) A set of goggles that meets ANSI Z87.179.
    (7) A chemically protective outfit that protects the wearer from 
the particular personnel hazards presented by the cargo vapor.
    (d) Each vessel must have a spare air supply consisting of at least 
one of the following:
    (1) One fully-charged air cylinder unit for each self-contained 
breathing apparatus required under paragraph (b) or (c) of this 
section, each air cylinder unit having at least a thirty minute supply 
of air with--
    (i) An air compressor capable of supplying high pressure air of the 
proper purity for recharging the cylinders; and
    (ii) A charging manifold capable of recharging two air cylinder 
units simultaneously.
    (2) Ten fully-charged air cylinder units, each with at least a 
thirty minute supply of air.
    (3) A low pressure-supplied air line system with--
    (i) Hose connections compatible with the self-contained breathing 
apparatus;
    (ii) Sufficient high pressure air capacity to supply, through 
pressure reduction devices, low pressure air to two persons for at 
least one hour; and
    (iii) An air compressor capable of supplying high pressure air of 
the purity for recharging the self-contained breathing apparatus and 
all fixed air bottles, if any.
    47. Section 154.1401 is added to as follows:


Sec. 154.1401  Safety equipment: Vessels carrying flammable cargoes.

    (a) Each vessel that has a cargo capacity of from 2,000 m\3\ 
through 5,000 m\3\ and that is carrying a cargo designated with an 
``I'' or ``I&T'' in the ``Vapor detection'' column of table 4 of this 
part must have the safety equipment required under Sec. 154.1400 and 
two additional fireman's outfits as described in Sec. 154.1400(b).
    (b) Each vessel that has a cargo capacity of 5,000 m\3\ or more and 
that is carrying a cargo designated with an ``I'' or ``I&T'' in the 
``Vapor detection'' column of table 4 this part must have the safety 
equipment required under Sec. 154.1400 and three additional fireman's 
outfits as described in Sec. 154.1400(b).
    48. Section 154.1402 is added to read as follows:


Sec. 154.1402  Safety equipment: Vessels carrying toxic cargoes.

    (a) Each vessel that has a cargo capacity of greater than 2,000 
m\3\ and that is carrying a cargo designated with an ``T'' in the 
``Vapor Detection'' column of table 4 of this part must have the safety 
equipment required under Sec. 154.1400 and, in addition, must have the 
following:
    (1) Two sets of personnel safety equipment as described in 
Sec. 154.1400(c).
    (2) One spare fully-charged air cylinder unit for each breathing 
apparatus required under paragraph (a)(1) of this section.
    (b) Each vessel that has a cargo capacity of greater than 2,000 
m\3\ and that is carrying a cargo designated with an ``I&T'' in the 
``Vapor detection'' column of table 4 of this part must have the safety 
equipment required under Secs. 154.1400 and 154.1401. In addition, the 
vessel must have the following:
    (1) One fully-charged air cylinder unit for each breathing 
apparatus required under Sec. 154.1401.
    (2) Two chemical protective outfits that protect the wearer from 
the particular personnel hazards presented by the cargo vapor.
    49. Section 154.1405 is revised to read as follows:


Sec. 154.1405  Respiratory and eye protection.

    (a) When table 4 of this part references this section, a vessel 
carrying the listed cargo must have--
    (1) Respiratory protection and eye protection equipment for each 
person on board that protects the person from the cargo vapor for at 
least five minutes; and
    (2) Two additional sets of respiratory protection and eye 
protection equipment that are stowed in the wheel house and protect the 
wearer from the cargo vapor for at least five minutes.
    (b) The equipment in paragraph (a) of this section must be used for 
emergency escape purposes only and must be marked to indicate that it 
is not suitable for, and must not be used for, fire fighting or cargo 
handling.
    (c) Filter type respiratory protection equipment is unacceptable 
for the purposes of this section.
    50. Section 154.1705 is revised to read as follows:


Sec. 154.1705  Independent tank.

    (a) The following cargoes must be carried in an independent tank:
    (1) Diethyl ether.
    (2) Monoethylamine.
    (3) Propylene oxide.
    (4) Vinyl ethyl ether.
    (b) The following cargoes must be carried in an independent tank 
type C that meets Sec. 154.701(a):
    (1) Ethylene oxide.
    (2) Methyl bromide.
    (3) Sulfur dioxide.
    51. Section 154.1718 is added to read as follows:


Sec. 154.1718  Submerged electric cargo pumps.

    The vapor space of cargo tanks equipped with submerged electric 
cargo pumps must be inerted to a positive pressure before loading, 
during carriage, and during unloading of high vapor pressure flammable 
liquids.
    52. Section 154.1720 is revised to read as follows:


Sec. 154.1720  Indirect refrigeration.

    A refrigeration system that is used to cool acetaldehyde, ethylene 
oxide, methyl bromide, propylene oxide, mixtures of propylene oxide/
ethylene oxide, or sulfur dioxide must be an indirect refrigeration 
system that does not use vapor compression.
    53. Sections 154.1721 through 154.1724 are added to read as 
follows:


Sec. 154.1721  Piping systems for toxic products.

    The cargo piping, vent piping, and refrigeration equipment of 
acargo tank carrying isopropylamine or monoethylamine must be 
completely separate from all other piping systems on the vessel.


Sec. 154.1722  Flame screens on vent outlets.

    When table 4 of this part refers to this section, the vent outlets 
need not comply with Sec. 154.805(c) but must meet either of the 
following:
    (a) Be provided with a flame screen that--
    (1) Meets Sec. 30.10-25 of this chapter;
    (2) Is readily renewable; and
    (3) Is designed and installed so as to prevent blockage by freezing 
cargo vapors or by icing in bad weather.
    (b) Have a device approved by the Commandant (G-MTH) to prevent the 
passage of flame.


Sec. 154.1723  Maximum allowable quantity of cargo per tank.

    When table 4 of this part refers to this section, no person may 
operate a tankship that carries a cargo tank containing in excess of 
3,000 m3 (105,923 ft3) of the listed cargo.


Sec. 154.1724  Vapor return connections.

    When table 4 of this part refers to this section, connections for 
returning the expelled gases ashore during loading must be provided.


Sec. 154.1735  [Amended]

    54. In Sec. 154.1735(b)(2)(ii), remove the word ``guage'' and add, 
in its place, the word ``gauge''.
    55. Section 154.1745 is revised to read as follows:


Sec. 154.1745  Vinyl chloride: Transfer operations.

    (a) The person in charge of a vinyl chloride transfer operation 
shall ensure that the following are complied with during that 
operation:
    (1) Cargo vapors are returned to the cargo tank or shore 
disposition for reclamation or destruction.
    (2) Continuous monitoring for vinyl chloride vapor leaks is 
conducted. Fixed or portable instrumentation may be used to ensure that 
personnel are not exposed to vinyl chloride vapor concentrations in 
excess of 1 ppm averaged over any eight hour period or 5 ppm averaged 
over any period not exceeding 15 minutes. The method of monitoring and 
measurement must have an accuracy (with a confidence level of 95%) of 
not less than plus or minus 50% from 0.25 ppm through 0.5 ppm, plus or 
minus 35% from over 0.5 ppm through 1.0 ppm, and plus or minus 25% over 
1.0 ppm.
    (3) The cargo transfer operation is discontinued or corrective 
action is initiated by the person in charge to minimize personnel 
exposure whenever a vinyl chloride vapor concentration in excess of 1 
ppm is detected. If the vinyl chloride concentration exceeds 5 ppm for 
over 15 minutes, action to reduce the leak may be continued only if 
each person in the area of the leak uses a respirator which meets the 
following:
    (i) The respirator must be approved by the Mine Safety and Health 
Administration (MSHA) under 30 CFR part 11. When filter elements are 
used, they must include approval for vinyl chloride.
    (ii) An electrically powered respirator also must meet the 
electrical engineering requirements in subchapter J of this chapter for 
the electrical hazard class and group listed in table 4 of this part.
    (4) Those portions of the cargo line that would be open to the 
atmosphere after piping is disconnected are free of vinyl chloride 
liquid and that the vinyl chloride vapor concentration in the area of 
the vinyl chloride piping disconnect points is not greater than 5 ppm.
    (5) Any restricted gauge fitted on a tank containing vinyl chloride 
is locked or sealed so that the gauge cannot be used.
    (6) A restricted gauge is not used as a means of verifying the 
reading obtained by the closed gauge or as a means of sampling.
    (b) The words ``Cancer Suspect Agent'' must be added to the warning 
sign, as required by Sec. 154.1830(f).
    (c) Signs bearing the legend ``CANCER SUSPECT AGENT IN THIS AREA--
PROTECTIVE EQUIPMENT REQUIRED--AUTHORIZED PERSONNEL ONLY'' must be 
posted whenever hazardous operations, such as tank cleaning, are in 
progress.
    (d) When vinyl chloride transfer operations are conducted, the 
vessel must be designated as a regulated area and access must be 
limited to authorized persons. A daily roster of persons authorized to 
enter the regulated area must be maintained on the vessel.
    (e) Personnel engaged in hazardous operations, such as tank 
cleaning, must be provided with, and required to wear and use, 
respirators under paragraph (a)(3) of this section. Also, protective 
garments capable of preventing skin contact with liquid vinyl chloride 
must be provided. The garments must be clean and dry for each use.
    56. In Sec. 154.1760, designate the text as paragraph (a) and add a 
new paragraph (b) to read as follows:


Sec. 154.1760  Liquid ammonia.

* * * * *
    (b) For pressure vessels and pipelines made of carbon-manganese 
steel, the oxygen content of the vapor space must be reduced to the 
minimum level practicable before the introduction of liquid ammonia at 
temperatures of greater than -20  deg.C (-4  deg.F).
    57. Sections 154.1765, 154.1770, and 154.1775 are added to read as 
follows:


Sec. 154.1765  Diethyl ether; vinyl ethyl ether.

    (a) Diethyl ether and vinyl ethyl ether cargoes must be discharged 
by deepwell pumps or by hydraulically operated submerged pumps.
    (b) When a diethyl ether or vinyl ethyl ether cargo is carried in 
independent tanks type C, inert gas displacement may be used to 
discharge the cargo if the cargo system is designed for the expected 
pressure.


Sec. 154.1770  Propylene oxide and mixtures of propylene oxide and 
ethylene oxide containing not more than 30% ethylene oxide by weight: 
Requirements for carriage.

    (a) Vessels carrying propylene oxide or a mixture of propylene 
oxide and ethylene oxide containing not more than 30% ethylene oxide by 
weight must meet the following:
    (1) Acetylene must not be present in the propylene oxide or the 
mixture of propylene oxide and ethylene oxide.
    (2) Cargo piping, vent piping, refrigeration equipment, and inert 
gas supply lines must be completely separate from piping systems for 
all other tanks, including empty tanks and cargo compressors. If the 
piping systems are not separate, they may be made separate by removing 
spool pieces, valves, and other pipe sections and installing blank 
flanges.
    (3) Valves, flanges, fittings, and accessory equipment must be made 
of steel, stainless steel, or other material specially approved by the 
Commandant (G-MTH).
    (4) Valve disk faces, seats, and other wearing parts of valves must 
be made of stainless steel containing not less than 11% chromium.
    (5) Gaskets must be constructed of spirally wound stainless steel 
with teflon or other material specially approved by the Commandant (G-
MTH). Gaskets made of neoprene or natural rubber, asbestos or asbestos 
mixed with other materials, or materials containing oxides of magnesium 
must not be used in propylene oxide containment systems.
    (6) Cargo piping must not have threaded joints.
    (7) The vessel must have an exterior water spray system under 
Sec. 154.1105 that protects the above deck cargo piping.
    (8) The vessel must have a nitrogen inerting system or on board 
nitrogen gas storage system capable of maintaining, for a period of 
thirty days at an oxygen level of 2% or less, an inert atmosphere in 
the vapor space of a tank carrying these cargoes.
    (b) Cargo tanks carrying propylene oxide which have a design vapor 
pressure of less than 0.6 Bar gauge (8.5 psig) and cargo tanks carrying 
mixtures of propylene oxide and ethylene oxide containing not more than 
30% ethylene oxide by weight which have a design vapor pressure of less 
than 1.2 Bar gauge (17.1 psig) must have a refrigeration system that 
maintains the product at a temperature below the reference temperature 
under Sec. 154.1844(b).
    (c) Cargo tanks in which the product is to be carried must meet the 
following:
    (1) Be constructed of steel or stainless steel.
    (2) For independent tanks of type C, have pressure relief valves 
settings that are--
    (i) Not less than 0.2 Bar gauge (2.8 psig);
    (ii) For propylene oxide, not more than 7.0 Bar guage (99.6 psig); 
and
    (iii) For propylene oxide and ethylene oxide mixtures, not more 
than 5.3 Bar guage (75.4 psig).
    (3) Have an automatic nitrogen make-up system that provides a 
padding of nitrogen and that does not allow the tank pressure to fall 
below 0.07 Bar guage (1.0 psig) in the event of a decrease in cargo 
temperature. Sufficient nitrogen of commercially pure quality must be 
available to satisfy this requirement. This requirement for automatic 
pressure control may be satisfied by a battery of nitrogen bottles 
connected to the cargo tank by a pressure reduction valve.
    (4) Be thoroughly cleaned, including washing or purging of 
associated piping, before other cargoes may be carried.


Sec. 154.1775  Propylene oxide and mixtures of propylene oxide and 
ethylene oxide containing not more than 30% ethylene oxide by weight: 
Transfer operations.

    (a) Propylene oxide and mixtures of propylene oxide and ethylene 
oxide containing not more than 30% ethylene oxide by weight may be 
transported only in accordance with cargo handling plans which have 
been approved by the Commanding Officer, U.S. Coast Guard Marine Safety 
Center (G-MSC). A separate cargo handling plan for each loading 
arrangement must be prepared which shows the entire piping system and 
the location of all blank flanges installed under Sec. 154.1770(a)(2). 
A copy of each approved cargo handling plan must be kept on board the 
vessel. The IMO Certificate must be endorsed to include reference to 
the approved cargo handling plans.
    (b) Before loading the product, a person acceptable to the Captain 
of the Port must perform the following:
    (1) Certify in writing that the piping separation under 
Sec. 154.1770(a)(2) has been achieved. This certification must be kept 
on board the vessel.
    (2) Fit a wire and seal to each connection between a blank flange 
and a pipeline flange to ensure that the blank flange is not 
inadvertently removed.
    (c) A list of the maximum allowable tank filling limits for each 
cargo tank, at each of the planned loading temperatures and at the 
maximum reference temperature, must be prepared and submitted to the 
Commanding Officer, U.S. Coast Guard Marine Safety Center (G-MSC) for 
approval. A copy of the approved list must be kept on board the vessel.
    (d) The master shall ensure that, before the product is loaded into 
a cargo tank--
    (1) The tank is thoroughly clean, dry, and free from rust;
    (2) The hold spaces are inerted with an inert gas that meets 
Sec. 154.1710(b)(1); and
    (3) The cargo tank vapor space is tested to ensure that the oxygen 
concentration is 2% (by volume) or less.
    (e) Cargo hoses used for the transfer of these products must be 
marked ``FOR ALKYLENE OXIDE TRANSFER ONLY''.
    (f) Filling and discharge piping must extend to within 100mm (4 in) 
of the bottom of the tank or any sump pit.
    (g) Venting of the cargo tanks to the atmosphere must not occur 
during loading or discharge. A vapor return to shore may be used during 
loading provided that the vapor return system connected to a 
containment system for the product is separate from all other 
containment systems.
    (h) The pressure in the cargo tank must be maintained above 0.07 
Bar guage (1.0 psig) during discharge operations.
    (i) The cargo must be discharged by deepwell pumps, hydraulically 
operated submerged pumps, or inert gas displacement.
    (j) Cargo pumps must be arranged to ensure that, if the discharge 
from the pump is turned off or otherwise blocked, there will not be a 
significant increase in the temperature of the cargo.
    (k) Before disconnecting the lines connecting to the shore 
facility, the pressure in liquid and vapor lines must be relieved 
through valves installed at the loading header. Liquid and vapor from 
the lines must not be discharged to the atmosphere.
    58. Section 154.1800 is revised to read as follows:


Sec. 154.1800  Operating requirements under part 35 of this chapter.

    Each vessel must operate in accordance with part 35 of this 
chapter, except for Sec. 35.30-20 of this chapter.
    59. In Sec. 154.1803, paragraph (b) is revised to read as follows:


Sec. 154.1803  Expiration of Certificates of Compliance.

* * * * *
    (b) If a vessel's IMO Certificate expires or otherwise becomes 
invalid, the vessel's Certificate of Compliance becomes invalid for the 
carriage of cargoes listed in table 4 of this part or authorized by 
special approval under Sec. 154.30. To maintain the validity of the 
Certificate of Compliance, the vessel's owner must submit a copy of the 
revised or reissued IMO Certificate to the Commanding Officer, U.S. 
Coast Guard Marine Safety Center (G-MSC).
    60. Section 154.1818, paragraph (a) is revised to read as follows:


Sec. 154.1818  Certification of inhibition.

    (a) Except as provided in Sec. 154.1740(b), no person may operate a 
vessel carrying butadiene, isoprene, vinyl chloride, vinyl ethyl ether, 
or vinylidene chloride without carrying in the wheelhouse written 
certification from the shipper that the product is inhibited.
 * * * * *


Sec. 154.1820  [Amended]

    61. In Sec. 154.1820 introductory text, remove the word 
``wheelhoue'' and add, in its place, the word ``wheelhouse''.
    62. Section 154.1831 is revised to read as follows:


Sec. 154.1831  Person in charge of cargo transfer operations.

    (a) The master of a U.S. flag vessel shall ensure that cargo 
transfer operations are supervised by a person designated as a person 
in charge of cargo transfer operations under 33 CFR 155.710(a)(1).
    (b) The master of a foreign flag vessel shall ensure that the cargo 
transfer operations are supervised by a person who--
    (1) Holds a valid document issued by the flag nation which 
authorizes that person to serve as a person in charge of cargo transfer 
operations on board the vessel that is transferring cargo;
    (2) Is designated as a person in charge of cargo transfer 
operations by the master;
    (3) Is readily able to communicate in English, either directly or 
through an interpreter, with the person in charge of cargo transfer at 
the transfer facility; and
    (4) Has studied and understands the responsibilities described in 
this subchapter.
    63. Section 154.1832 is added to read as follows:


Sec. 154.1832  Incompatible cargo.

    (a) The person in charge of cargo transfer operations under 
Sec. 154.1831 may not authorize the loading of incompatible cargoes 
under part 150 of this chapter, unless the cargo containment systems 
meet the following:
    (1) Are separated by--
    (i) Cofferdams, other than spaces between primary and secondary 
barriers;
    (ii) Empty tanks;
    (iii) Tanks containing mutually compatible cargoes;
    (iv) Pipe tunnels; or
    (v) Void spaces.
    (2) Have separate cargo piping and venting systems.
    (b) The person in charge of cargo transfer operations may not 
authorize the loading into a tank of a cargo that is incompatible under 
part 150 of this chapter with residue left in the tank from a previous 
cargo.
    64. Section 154.1834 is revised to read as follows:


Sec. 154.1834  Cargo transfer piping.

    The person in charge of cargo transfer operations under 
Sec. 154.1831 shall ensure that--
    (a) Cargo is transferred to or from a cargo tank only through the 
vessel's cargo piping system; and
    (b) All cargo vapor or cargo tank inert gas displaced by the cargo 
loading operation is--
    (1) Managed on board the vessel to eliminate atmospheric venting; 
or
    (2) Returned to shore through the vapor return connections under 
Sec. 154.1724, if the transfer terminal has vapor return equipment 
capable of handling the vapor from the cargo tank.
    65. In Sec. 154.1850, paragraph (d) is added to read as follows:


Sec. 154.1850  Entering cargo handling spaces.

* * * * *
    (d) Before permitting hot work near internal insulation tanks, the 
gas absorbing and desorbing characteristics of the tank insulation 
material must be taken into consideration.
    66. In Sec. 154.1870(d), revise the list of chemicals to read as 
follows:


Sec. 154.1870  Bow and stern loading.

 * * * * *
    (d) * * * 
    (1) Acetaldehyde.
    (2) Ammonia, anhydrous.
    (3) Diethyl ether.
    (4) Dimethylamine.
    (5) Ethyl chloride.
    (6) Isopropylamine.
    (7) Methyl chloride.
    (8) Monethylamine.
    (9) Propylene oxide.
    (10) Vinyl chloride.
    (11) Viny ethyl ether.
    (12) Vinylidene chloride.
    67. Following Sec. 154.1872, revise table 4 and its footnotes to 
read as follows;


Sec. 154.1872  Cargo emergency jettisoning.

 * * * * *

                                                        Table 4.--Summary of Minimum Requirements                                                       
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                          Electrical                                    
                                                  Independent   Control of       Vapor                   hazard class                                   
        Cargo name\1\\2\            Ship type     tank type C   cargo tank   detection\3\   Gauging\4\   and group\5\   Special requirements in part 154
                                                   required    vapor space                                                                              
--------------------------------------------------------------------------------------------------------------------------------------------------------
Acetaldehyde.....................  IIG/IIPG      ............  Inert.......  I & T         C             1-C           1401, 1402, 1410, 1710, 1720,    
                                                                                                                        1870.                           
Ammonia, anhydrous...............  IIG/IIPG      ............  ............  T             C             1-D           1402, 1405, 1410, 1702 (b), (c) &
                                                                                                                        (e), 1760, 1870.                
Butadiene........................  IIG/IIPG      ............  Inert.......  I             R             1-B           1401, 1702 (b), (d) & (f), 1710, 
                                                                                                                        1750, 1818.                     
Butane...........................  IIG/IIPG      ............  ............  I             R             1-D           1401.                            
Butylene.........................  IIG/IIPG      ............  ............  I             R             1-D           1401.                            
Diethyl ether\6\.................  IIG/IIPG      ............  Inert.......  I & T         C             1-C           1401, 1405, 1410, 1702(b),       
                                                                                                                        1705(a), 1710, 1722-1724, 1765, 
                                                                                                                        1870(d).                        
Dimethylamine....................  IIG/IIPG      ............  ............  I             C             1-C           1401, 1402, 1405, 1410, 1702 (b),
                                                                                                                        (c) & (e), 1870.                
Ethane...........................  IIG           ............  ............  I             R             1-D           1401.                            
Ethyl chloride...................  IIG/IIPG      ............  ............  I & T         R             1-D           1401, 1402, 1870.                
Ethylene.........................  IIG           ............  ............  I             R             1-C           1401.                            
Ethylene oxide...................  IG            Yes.........  Inert.......  I & T         C             1-B           660(b)(3), 1401, 1402, 1405,     
                                                                                                                        1410, 1702 (b), (d) & (f),      
                                                                                                                        1705(b), 1710, 1720, 1725, 1730,
                                                                                                                        1870 (a) & (b).                 
Isoprene\6\......................  IIG/IIPG      ............  ............  I             R             1-D           1401, 1410, 1718, 1722, 1724,    
                                                                                                                        1728, 1818.                     
Isopropylamine\6\................  IIG/IIPG      ............  ............  I & T         C             1-D           1401, 1405, 1702 (b) & (c), 1718,
                                                                                                                        1721, 1722, 1723, 1724, 1870(d).
Methane (LNG)....................  IIG           ............  ............  I             C             1-D           703-709, 1401, 1854.             
Methyl acetylene-propadiene        IIG/IIPG      ............  ............  I             R             1-C           1401, 1735.                      
 mixture.                                                                                                                                               
Methyl bromide...................  IG            Yes.........  ............  T             C             1-D           660(b)(3), 1345 (c) & (d), 1402, 
                                                                                                                        1405, 1410, 1702 (a) & (d),     
                                                                                                                        1705(b), 1720, 1870 (a) & (b).  
Methyl chloride..................  IIG/IIPG      ............  ............  I & T         C             1-D           1401, 1402, 1702(a), 1870.       
Monoethylamine\6\................  IIG/IIPG      ............  ............  I & T         C             1-D           1401, 1402, 1405, 1702 (b) & (c),
                                                                                                                        1718, 1721, 1722, 1723, 1724,   
                                                                                                                        1870(d).                        
Nitrogen.........................  IIIG          ............  ............  O...........  C             ............  1755.                            
Propane..........................  IIG/IIPG      ............  ............  I             R             1-D           1401.                            
Propylene........................  IIG/IIPG      ............  ............  I             R             1-D           1401.                            
Propylene oxide\6\...............  IIG/IIPG      ............  Inert.......  I & T         C             1-B           1401, 1402, 1410, 1705(a), 1710, 
                                                                                                                        1720, 1722, 1723, 1724, 1770,   
                                                                                                                        1775, 1870(d).                  
Propylene oxide and ethylene       IIG/IIPG      ............  Inert.......  I & T         C             1-B           1401, 1402, 1410, 1705(a), 1710, 
 oxide mixture (30% w/w ethylene                                                                                        1720, 1722, 1723, 1724, 1770,   
 oxide)\6\.                                                                                                             1775, 1870(d).                  
Refrigerant gases................  IIIG          ............  ............  ............  R             ............  None.                            
Sulfur dioxide...................  IG            Yes.........  Dry.........  T             C             ............  660(b)(3), 1345 (c) & (d), 1401, 
                                                                                                                        1402, 1405, 1410, 1705(b), 1715,
                                                                                                                        1720, 1870 (a) & (b).           
Vinyl chloride...................  IIG/IIPG      ............  ............  I & T         C             1-D           1401, 1405, 1410, 1702 (a), (b), 
                                                                                                                        (d) & (f), 1710, 1740, 1745,    
                                                                                                                        1750, 1818, 1830(f), 1870.      
Vinyl ethyl ether\6\.............  IIG/IIPG      ............  Inert.......  I & T         C             ............  1401, 1402, 1405, 1410, 1705(a), 
                                                                                                                        1710, 1722, 1723, 1724, 1765,   
                                                                                                                        1818, 1870(d).                  
Vinylidene chloride\6\...........  IIG/IIPG      ............  Inert.......  I & T         R             1-D           1401, 1402, 1405, 1410, 1710,    
                                                                                                                        1722, 1723, 1724, 1818, 1870(d).
--------------------------------------------------------------------------------------------------------------------------------------------------------
\1\Refrigerant gases include non-toxic, non-flammable gases, such as dichlorodifluoromethane, dichloromonofluoromethane, dichlorotetrafluoroethane,     
  monochlorodifluoromethene, monochlortetrafluoroethane, and monochlortrifluoromethane.                                                                 
\2\Unless otherwise specified, a cargo may be shipped under these requirements when it contains up to 5% total acetylene.                               
\3\As used in this column, ``I'' stands for flammable vapor detection, ``T'' stands for toxic vapor detection, and ``O'' stands for oxygen detection.   
  See Secs. 154.1345 through 154.1360.                                                                                                                  
\4\As used in this column, ``C'' stands for closed gauging and ``R'' stands for restricted gauging. See Sec. 154.1300.                                  
\5\The designations used in this column are from the National Electrical Code.                                                                          
\6\This cargo is covered also by part 153 of this chapter.                                                                                              

    Dated: April 18, 1994.
A.E. Henn,
Rear Admiral, U.S. Coast Guard, Chief, Office of Marine Safety, 
Security and Environmental Protection.
[FR Doc. 94-13537 Filed 6-3-94; 8:45 am]
BILLING CODE 4910-14-M