[Federal Register Volume 83, Number 108 (Tuesday, June 5, 2018)]
[Notices]
[Pages 26144-26148]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-11988]


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DEPARTMENT OF TRANSPORTATION

Pipeline and Hazardous Materials Safety Administration

[Docket No. PHMSA-2017-0142; Notice No. 2017-11]


Hazardous Materials: Notice of Updated Rail Tank Car Thermal 
Protection Systems List

AGENCY: Pipeline and Hazardous Materials Safety Administration (PHMSA), 
Department of Transportation (DOT).

ACTION: Notice and request for comments.

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SUMMARY: The Pipeline and Hazardous Materials Safety Administration 
(PHMSA) issues this notice in coordination with the Federal Railroad 
Administration (FRA) to notify the public of four systems that have 
been added to the thermal protection systems list since its most recent 
publication, as well as to solicit comments or updates to information 
on the current list. The thermal protection systems included on the 
list are compliant and are acceptable for use, without further test 
verification, on U.S. Department of Transportation (DOT) specification 
tank cars. DOT manages the list through the PHMSA Records Center and 
periodically publishes an updated list in the Federal Register for 
public awareness.

DATES: Interested persons are invited to submit comments on or before 
September 4, 2018.

ADDRESSES: You may submit comments identified by Docket No. PHMSA-2017-
0142 via any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the online instructions for submitting 
comments.
     Fax: 1-202-493-2251.
     Mail: Docket Operations, U.S. Department of 
Transportation, West Building, Ground Floor, Room W12-140, Routing 
Symbol M-30, 1200 New Jersey Avenue SE, Washington, DC 20590.
     Hand Delivery: Docket Operations, Room W12-140 on the 
ground floor of the West Building, 1200 New Jersey Avenue SE, 
Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, 
except Federal holidays.
    Instructions: All submissions must include the agency name and 
docket number for this notice. Internet users may access comments 
received by DOT at: http://www.regulations.gov. Please note that 
comments received will be posted without change to http://www.regulations.gov including any personal information provided.
    Privacy Act: In accordance with 5 U.S.C. 553(c), DOT solicits 
comments from the public. DOT posts these comments, without edit, 
including any personal information the commenter provides, to http://www.regulations.gov, as described in the system of records notice (DOT/
ALL-14 FDMS), which can be reviewed at http://www.dot.gov/privacy.

FOR FURTHER INFORMATION CONTACT: 
    Pipeline and Hazardous Materials Safety Administration: Leonard 
Majors, Sciences, Engineering and Research Division (PHH-22), U.S. 
Department of Transportation, Pipeline and Hazardous Materials Safety 
Administration, 1200 New Jersey Avenue SE, East Building, 2nd Floor, 
Washington, DC 20590-0001, Telephone (202) 366-4545, 
[email protected].
    Federal Railroad Administration: Dr. Phani Raj, Hazardous Materials 
Division, Office of Railroad Safety (FRA-RRS-12), U.S. Department of 
Transportation, Federal Railroad Administration, 1200 New Jersey Avenue 
SE, West Building, 3rd Floor, Washington, DC 20590-0001, Telephone 
(202) 493-6306, [email protected].

SUPPLEMENTARY INFORMATION: 

Table of Contents

I. Executive Summary
II. Background
III. A List of Thermal Protection Systems Excepted From Test 
Verification
IV. Revisions to the List of Thermal Protection Systems Excepted 
From Test Verification

I. Executive Summary

    The Pipeline and Hazardous Materials Safety Administration (PHMSA) 
issues this notice in coordination with the Federal Railroad 
Administration (FRA) to notify the public of four systems that have 
been added to the thermal protection systems list since its most recent 
publication, as well as to solicit comments or updates to information 
on

[[Page 26145]]

the current list. The thermal protection systems included on the list 
have passed the pool fire and torch fire tests specified in appendix B 
to 49 CFR part 179 and are acceptable for use, without further test 
verification, on certain U.S. Department of Transportation (DOT) 
specification tank cars. The list is maintained and updated in the 
PHMSA Records Center in accordance with Sec.  179.18.
    The thermal protection systems list was last published in the 
Federal Register on May 13, 1993 (Notice No. 93-12; 58 FR 28436). PHMSA 
is issuing this notice to inform the public of four thermal protection 
systems that have been added to the list since the previous notice was 
published in the Federal Register and to solicit comments or updates to 
the information on the current list. Information updates may include, 
but are not limited to, the following: Company name and location 
changes; material or tradename updates; and information on the use of 
these systems.
    PHMSA is providing a 90-day comment period for responses and will 
publish a future Federal Register notice to address the information 
received and update the list with revisions, if necessary. This notice 
is not a rulemaking action, as it simply provides the rail industry 
with the information necessary to equip DOT specification rail tank 
cars. PHMSA will continue to maintain the list of thermal protection 
systems in the PHMSA Records Center and will also post a copy of the 
list to our website at http://www.phmsa.dot.gov, where future additions 
and revisions will be published.

II. Background

    Thermal protection systems, when required by regulation for DOT 
specification tank cars, must meet the requirements of the Hazardous 
Materials Regulations (HMR). To qualify, the thermal protection system 
must conform to the performance standard and demonstrate such 
compliance through analysis of pool fire and torch fire tests required 
by Sec.  179.18. Thermal protection systems that no longer require 
testing must demonstrate successful testing as specified in appendix B 
to 49 CFR part 179--Procedures for Simulated Pool and Torch-Fire 
Testing. Specifically, the procedures are designed to measure the 
thermal effects of new or untried thermal protection systems and to 
test for system survivability when exposed to pool fire and torch fire 
environments.
     Pool Fire Simulation Test: Must be run for a minimum of 
100 minutes. The thermal protection system covers a specified steel 
plate that meets the requirements of paragraph 2a(2) in appendix B to 
49 CFR part 179. The thermal protection system is exposed to a 
simulated pool fire as specified in appendix B to 49 CFR part 179, and 
it must retard the heat flow to the plate so that none of the 
thermocouples on the non-protected side of the plate indicate a plate 
temperature in excess of 427 [deg]C (800 [deg]F).
     Torch Fire Simulation Test: Must be run for a minimum of 
30 minutes. The thermal protection system covers a specified steel 
plate that meets the requirements of paragraph 3a(2) in appendix B to 
49 CFR part 179. The thermal protection system is exposed to a 
simulated torch fire as specified in appendix B to 49 CFR part 179, and 
it must retard the heat flow to the plate so that none of the 
thermocouples on the backside of the bare plate indicate a plate 
temperature in excess of 427 [deg]C (800[emsp14][deg]F).
    When the HMR require a thermal protection system on a tank car, the 
tank car must have sufficient thermal resistance so that there will be 
no release of any lading within the tank car, except release through 
the pressure release device (Sec.  179.18(a)). Compliance with these 
requirements is verified by analyzing the fire effects on the entire 
surface of the tank car (Sec.  179.18(b)). The analysis must consider 
the fire effects on and heat flux through tank discontinuities, 
protective housings, underframes, metal jackets, insulation, and 
thermal protection. A complete record of each analysis shall be made, 
retained, and--upon request--made available for inspection and 
replication by an authorized representative of DOT.
    DOT maintains a list of thermal protection systems that comply with 
the requirements of appendix B to 49 CFR part 179 and no longer require 
test verification (Sec.  179.18(c)). FRA receives test data from 
manufacturers to validate that the thermal protection systems meet the 
HMR requirements. PHMSA and FRA evaluate the test data to determine 
whether the system is appropriate for inclusion on the list. Once 
accepted, the material characteristics and the information necessary to 
apply any of the systems on this list to DOT specification rail tank 
cars is communicated to the public. This information is available in 
the PHMSA Records Center, Pipeline and Hazardous Materials Safety 
Administration, East Building, 1200 New Jersey Avenue SE, Washington, 
DC 20590-0001.
    The current thermal protection systems list was most recently 
published in the Federal Register on May 13, 1993, in Notice No. 93-12 
(58 FR 28436). To add a thermal protection system to the list, persons 
must provide test data and technical specifications showing that the 
system successfully passes the pool and torch fire tests required by 
appendix B to 49 CFR part 179. This information may be submitted to 
FRA's Hazardous Materials Division, Office of Railroad Safety. See FOR 
FURTHER INFORMATION CONTACT.

III. A List of Thermal Protection Systems Excepted From Test 
Verification

    The two previous lists of thermal protection systems excepted from 
test verification were published in the Federal Register on May 13, 
1993 (58 FR 28436) and January 31, 1986 (51 FR 4063). The current list 
identifies thermal protection systems by their 1993 system application 
number, with the 1986 system application number shown in parentheses, 
if applicable. Furthermore, the four new systems that have been 
approved by DOT since 1993 are: Nutec Fibratec SA de CV of Mexico's \1/
2\-Inch Thick Ceramic Fire Blanket; Jotun Paints, Inc.'s Jotachar JF750 
Intumescent Paint; Premier Refractories' Cer-Wool FP Blanket; and 
Thermal Ceramics' Superwool Plus Insulation Tank Car Blanket. The 
current list of thermal protection systems is as follows:

1. Carborundum Company, Niagara Falls, New York

Fiberfrax
     System Application 01 (6): Apply 1.651 cm (0.65 inches) 
minimum thickness Fiberfrax thermal protection (density >=72.1 kg/m\3\ 
(4.5 lbs/ft\3\), then an 11-gauge steel jacket.
     System Application 02 (22): (<288 [deg]C) Apply 1.27 cm 
(0.5 inch) minimum thickness Fiberfrax thermal protection (density 
>=72.1 kg/m\3\ (4.5 lbs/ft\3\)), compressed no less than 0.635 cm (0.25 
inch) with froth-in-place rigid urethane foam, then an 11-gauge steel 
jacket. The total thickness of the Fiberfrax thermal protection and the 
urethane foam combination must be at least 5.08 cm (2.0 inches).
     System Application 03 (23): (<288 [deg]C) Apply 2.54 cm 
(1.0 inch) minimum thickness Fiberfrax thermal protection (density 
>=72.1 kg/m\3\ (4.5 lbs/ft\3\)), compressed no less than 1.372 cm (0.54 
inches) with froth-in-place rigid urethane foam, then an 11-gauge steel 
jacket. The total thickness of the Fiberfrax thermal protection and the 
urethane foam combination must be at least 5.08 cm (2.0 inches).

[[Page 26146]]

     System Application 04 (24): (<288 [deg]C) Apply 1.27 cm 
(0.5 inch) minimum thickness Fiberfrax thermal protection (density 
>=68.9 kg/m\3\ (4.3 lbs/ft\3\)), then apply 10.16 cm (4.0 inches) 
minimum thickness glass fiber insulation compressed to 8.89 cm (3.5 
inches), and then an 11-gauge steel jacket.
     System Application 05 (29): Apply 1.27 cm (0.50 inch) 
minimum thickness Fiberfrax thermal protection (density >=72.1 kg/m\3\ 
(4.5 lbs/ft\3\)), then an 11-gauge steel jacket.
     System Application 06: Persons may use this system 
provided the tank car is constructed from at least 1.905 cm (0.75 inch) 
carbon steel plate. Apply 1.27 cm (0.50 inch) minimum thickness 
Fiberfrax thermal protection and the glass fiber insulation combination 
must be at least 8.89 cm (3.5 inches).

2. Courtaulds Aerospace, Incorporated, Des Plaines, Illinois

Thermal Shield Coating
    System Application 01 (4): Apply 0.002 cm (\7/10\-mil) primer (a 
2:1 ratio by volume of 513-003 base component and 9110x350 activator 
component). Next, apply 0.597 cm (235 mils) of Thermal Shield Coating 
(a nominal 5:1 ratio by volume of 821x359 base component and 9110x407 
activator component) to the primed surface, then 0.005 cm (2 mils) of 
topcoat (a 2:1 ratio by volume of 821x317 base component and 9110x376 
activator component).

3. Fibrex, Incorporated, Aurora, Illinois

A. Tank Wrap Insulation
    System Application 01 (8): Apply 3.81 cm (1.5 inches) minimum 
thickness Tank Wrap Insulation (density >=96.1 kg/m\3\ (6 lbs/ft\3\)), 
compressed to 2.54 cm (1.0 inch), then an 11-gauge steel jacket.
B. Tank Car Insulation
    System Application 01 (25): (<288 [deg]C) Apply 3.81 cm (1.5 
inches) minimum thickness Tank Car Insulation (density >=96.1 kg/m\3\ 
(6 lbs/ft\3\)), and 7.62 cm (3.0 inches) minimum thickness glass fiber 
insulation compressed to 6.35 cm (2.5 inches), then an 11-gauge steel 
jacket.

4. Holmes, Insulation Limited, Ontario, Canada

HILBLOK 1212
    System Application 01 (7): Apply 2.54 cm (1.0 inch) minimum 
thickness of HILBLOK 1212 (density >=200.2 kg/m\3\ (12.5 lbs/ft\3\)), 
then an 11-gauge steel jacket.

5. Nutec Fibratec SA de CV of Mexico

\1/2\-Inch Thick Ceramic Fire Blanket
    System Application 01: Apply 12.7 mm (0.50 inches) minimum 
thickness \1/2\-inch thick Ceramic Fire Blanket manufactured by Nutec 
Fibratec SA de CV of Mexico with an average mass density equal to or 
greater than 99.0 kg/m\3\ (6.18 lb/ft\3\), and then apply a 3.18 mm 
thick (11-gauge) steel jacket.

6. Jotun Paints, Inc., Belle Chasse, Louisiana

Jotachar JF750 Intumescent Paint
    System Application 01: Apply 5.0 mm (0.20 inches) minimum thickness 
Jotachar JF750 Intumescent Paint manufactured by Jotun Paints, Inc. The 
coating is a proprietary mixture of two products, Jotachar JF750 Comp A 
and Jotachar JF750 Comp B that is applied in two coats for a nominal 
thickness of 5.0 mm (0.20 inches).

7. Premier Refractories, Erwin, Tennessee

Cer-Wool FP Blanket
    System Application 01: (<288[deg]C) Apply 1.17 cm (0.46 inches) 
minimum thickness Cer-Wool FP Blanket (weight per unit area >=1.04 kg/
m\2\ (0.21 lbs/ft\2\)), then apply 10.16 cm (4.0 inches) minimum 
thickness fiber insulation (density >=11.1 kg/m\3\) compressed to 8.89 
cm (3.5 inches), and then an 11-gauge steel jacket.

8. Rock Wool Manufacturing, Leeds, Alabama

Delta Board
    System Application 01 (1): Apply 2.54 cm (1.0 inch) minimum 
thickness of Delta Board (density >=192.2 kg/m\3\ (12 lbs/ft\3\)), then 
an 11-gauge steel jacket.

9. Textron Specialty Materials, Lowell, Massachusetts

Chartek 59
     System Application 01 (3): Apply 0.008 cm (3 mils) of 
primer (Military Standard MIL-P-5219B), then apply a 2.54 cm (1.0 inch) 
hexagonal, 22-gauge, wire mesh to the primed surface. Next, apply 0.457 
cm (180 mils) Chartek 59 thermal protection, then 0.008 cm (3 mils) of 
AMERCOAT 383 (Brea, California) to the cured surface.
     System Application 02 (18): (<288 [deg]C) Apply 5.08 cm 
(2.0 inches) minimum thickness polyurethane foam then an 11-gauge steel 
jacket, then apply 0.005 cm (2 mils) minimum of primer (Military 
Standard MIL-P-52192B, Mobile 13-R-56, or equivalent) to the clean 
surface. Next, apply 0.53 cm (210 mils) minimum thickness of Chartek 59 
thermal protection to the cured surface.
     System Application 03 (19): (<288 [deg]C) Apply 5.08 cm 
(2.0 inches) minimum thickness glass fiber then an 11-gauge steel 
jacket, then apply 0.005 cm (2 mils) minimum of primer (Military 
Standard MIL-P-52192B, Mobile 13-R-56, or equivalent) to the clean 
surface. Next, apply 0.46 cm (180 mils) minimum thickness of Chartek 59 
thermal protection to the cured surface.
     System Application 04 (21): (<288 [deg]C) Apply 5.08 cm 
(2.0 inches) minimum thickness polyurethane foam then an 11-gauge steel 
jacket, then apply 0.005 cm (2 mils) minimum of primer (Military 
Standard MIL-P-52192B, Mobile 13-R-56, or equivalent) to the clean 
surface. Next, apply 0.46 cm (180 mils) minimum thickness of Chartek 59 
thermal protection to the cured surface.
     System Application 05 (30): (<288 [deg]C) Apply 0.008 cm 
(3 mils) of primer (Military Standard MIL-P- 52192B) to the clean 
surface. The use of a primer is optional when facilities complete the 
surface preparation and coating operations within six hours and the 
atmosphere has a dew point above 3 [deg]C (37.4[emsp14][deg]F). When 
desired, applicators may place a 2.54 cm (1.0 inch) hexagonal 22-gauge 
wire mesh to the primed surface. Next, apply 0.457 cm (180 mils) of 
Chartek 59 thermal protection to the cured surface, then apply 0.008 cm 
(3 mils) of an AMERCOAT 383 topcoat (Brea, California) to the Chartek 
59 thermal protection to the cured surface.
     System Application 06 (31): (<288 [deg]C) Apply 5.08 cm 
(2.0 inches) minimum thickness polyurethane foam then an 11-gauge steel 
jacket, then apply 0.005 cm (2 mils) minimum of primer (Military 
Standard MIL-P-52192B, Mobile 13-R-56, or equivalent) to the clean 
surface. When desired, applicators may place a 2.54 cm (1.0 inch) 
hexagonal 22-gauge wire mesh to the primed surface. Next, apply 0.46 cm 
(180 mils) minimum thickness of Chartek 59 thermal protection to the 
cured surface.
     System Application 07 (34): (<288 [deg]C) Apply 5.08 cm 
(2.0 inches) minimum thickness glass fiber insulation then an 11-gauge 
steel jacket, then apply 0.005 cm (2 mils) minimum of a polyamide epoxy 
primer (Military Standard MIL-P-52192B, Mobile 13-R-56, or equivalent) 
to the clean surface. When desired, applicators may place a 2.54 cm 
(1.0 inch) hexagonal 22-gauge wire mesh to the primed surface. Next, 
apply 0.46 cm (180 mils) minimum thickness of Chartek 59 thermal 
protection to the cured surface.

[[Page 26147]]

     System Application 08: Apply 0.008 cm (3 mils) of primary 
(Military Standard MIL-P-5219B), then apply a 2.54 cm (1.0 inch) 
hexagonal, 22-gauge, wire mesh to the primed surface. Next, apply 0.46 
cm (180 mils) Chartek 59 thermal protection, then apply 0.008 cm (3 
mils) of AMERCOAT (Brea, California) to the Chartek 59 thermal 
protection to the cured surface.

10. Thermal Ceramics, Augusta, Georgia

A. Kaowool Tank Car Blanket
     System Application 01 (5): Apply 2.54 cm (1.0 inch) 
minimum thickness of Kaowool Tank Car Blanket (density >=32.7 kg/m\3\ 
(2.04 lbs/ft\3\)), then an 11-gauge steel jacket.
     System Application 02 (10): Apply 1.32 cm (0.52 inches) 
minimum thickness of Kaowool Tank Car Blanket (density >=76.9 kg/m\3\ 
(4.8 lbs/ft\3\)), then an 11-gauge steel jacket.
     System Application 03 (32): (<288 [deg]C) Apply 2.54 cm 
(1.0 inch) minimum thickness of Kaowool Tank Car Blanket (density 
>=72.1 kg/m\3\ (4.5 lbs/ft\3\)), then apply 10.16 cm (4.0 inches) of 
glass fiber insulation compressed to 7.62 cm (3.0 inches), then an 11-
gauge steel jacket.
     System Application 04 (33): (<288 [deg]C) Apply 1.321 cm 
(0.52 inches) minimum thickness of Kaowool Tank Car Blanket (density 
>=76.9 kg/m\3\ (4.8 lbs/ft\3\)), then apply 10.16 cm (4.0 inches) of 
glass fiber insulation compressed to 8.89 cm (3.5 inches), then an 11-
gauge steel jacket.
     System Application 05 (35): (<288 [deg]C) Apply 2.54 cm 
(1.0 inch) minimum thickness of Kaowool Tank Car Blanket (density 
>=72.1 kg/m\3\ (4.5 lbs/ft\3\)), then apply 10.16 cm (4.0 inches) of 
glass fiber insulation compressed to 7.62 cm (3.0 inches), then an 11-
gauge steel jacket.
     System Application 06 (36): (<288 [deg]C) Apply 1.321 cm 
(0.52 inches) minimum thickness of Kaowool Tank Car Blanket (density 
>=76.9 kg/m\3\ (4.8 lbs/ft\3\)), then apply 10.16 cm (4.0 inches) of 
glass fiber insulation compressed to 8.89 cm (3.5 inches), and then an 
11-gauge steel jacket.
     System Application 07: Apply 2.54 cm (1.0 inch) minimum 
thickness of Kaowool Tank Car Blanket (density >=64.1 kg/m\3\ (4 lbs/
ft\3\)), then an 11-gauge steel jacket having an annular space of 1.016 
cm (0.4 inches) between the thermal protection and the steel jacket.
B. Cerawool Tank Car Blanket
     System Application 01 (9): Apply 1.524 cm (0.6 inch) 
minimum thickness of Cerawool Tank Car Blanket (density >=64.1 kg/m\3\ 
(4 lbs/ft\3\)), then an 11-gauge steel jacket having an annular space 
of 1.016 cm (0.4 inches) between the thermal protection and the jacket.
     System Application 02: Apply 2.54 cm (1.0 inch) minimum 
thickness of Cerawool Tank Car Blanket (density >=54.9 kg/m\3\ (3.43 
lbs/ft\3\)), and 5.08 cm (2.0 inches) minimum thickness polyurethane 
foam, then an 11-gauge steel jacket.
C. Superwool Plus Insulation Tank Car Blanket
     System Application 01: Apply 12.7 mm (0.50 inches) minimum 
thickness Superwool Plus Insulation Tank Car Blanket with an average 
mass density >=60.2 kg/m\3\ (3.76 lbs/ft\3\), then apply 101.6 mm (4.0 
inches) minimum thickness of glass fiber insulation with density >=12.0 
kg/m\3\ (0.75 lbs/ft\3\). The insulation components are compressed to 
101.6 mm (4.0 inches), and then apply a 3.18 mm thick (11-gauge) steel 
jacket.
     System Application 02: Apply 12.7 mm (0.50 inches) minimum 
thickness Superwool Plus Insulation Tank Car Blanket with an average 
mass density equal to or greater than of 60.2 kg/m\3\ (3.76 lbs/ft\3\), 
and then apply a 3.18 mm thick (11-gauge) steel jacket over the 
insulation.

11. Thermal Sciences, Incorporated, St. Louis, Missouri

A. Thermo-lag 330-1 Subliming Material System
     System Application 01 (2): Apply 0.005 cm (2 mils) of 
Thermo-lag Primer 351, 0.127 cm (5 mils) Thermo-lag 351-EX176 Primer, 
or 0.02 cm (8 mils) of PLASITE 7156 Primer, then apply 0.419 cm (165 
mils) of Thermo-lag 330-1 Subliming Compound. Next, apply 0.013 cm (5 
mils) of Thermo-lag Topcoat 350. Thermo-lag 330-CA cure accelerator may 
be added to the above components.
     System Application 02: Apply 0.020 cm (8 mils) of 
Wisconsin Protective Coatings' Plasite 7156 (Green Bay, Wisconsin), 
then apply 0.419 cm (165 mils) of Thermo-lag 330-1 Subliming Compound. 
Next, apply 0.013 cm (5 mils) of Thermolag Topcoat 350.
B. Thermo-lag 330-3 Subliming Material System
     System Application 01 (12): Apply 5.08 cm (2.0 inches) 
minimum thickness of glass fiber then an 11-gauge steel jacket, then 
apply 0.010 cm (4 mils) minimum thickness of Thermo-lag Primer 351-3 
primer to the tank jacket. Next, apply 0.32 cm (125 mils) minimum 
thickness of Thermo-lag 330-3 Subliming Compound, and then apply 0.013 
cm (5 mils) of Thermo-lag Topcoat 350-3.
     System Application 02 (13): Apply 5.08 cm (2.0 inches) 
minimum thickness of polyurethane, then an 11-gauge steel jacket, then 
apply 0.010 cm (4 mils) minimum thickness of Thermo-lag Primer 351-3 
primer to the tank jacket, and then apply 0.32 cm (125 mils) minimum 
thickness of Thermo-lag 330-3 Subliming Compound. Next, apply 0.013 cm 
(5 mils) of Thermo-lag Topcoat 350-3.
     System Application 03 (14): Apply 5.08 cm (2.0 inches) 
minimum thickness of glass fiber then an 11-gauge steel jacket, then 
apply 0.010 cm (4 mils) minimum thickness of Thermo-lag Primer 351-3 
primer to the exterior tank jacket, and then apply 0.34 cm (135 mils) 
minimum thickness of Thermo-lag 330-3 Subliming Compound. Next, apply 
0.013 cm (5 mils) of Thermo-lag Topcoat 350-3.
     System Application 04 (16): (<288 [deg]C) Apply 5.08 cm 
(2.0 inches) minimum thickness of glass fiber then an 11-gauge steel 
jacket, then apply 0.010 cm (4 mils) minimum film thickness of Thermo-
lag Primer 351-3 primer to the tank jacket, and then apply 0.48 cm (188 
mils) minimum thickness of Thermo-lag 330-3 Subliming Compound. Next, 
apply 0.013 cm (5 mils) of Thermo-lag Topcoat 350-3.
     System Application 05 (17): (<288 [deg]C) Apply 5.08 cm 
(2.0 inches) minimum thickness of polyurethane then an 11-gauge steel 
jacket, then apply 0.010 cm (4 mils) minimum thickness of Thermo-lag 
Primer 351-3 primer to the tank jacket. Next, apply 0.48 cm (188 mils) 
minimum thickness of Thermo-lag 330-3 Subliming Compound. Next, apply 
0.013 cm (5 mils) of Thermo-lag Topcoat 350-3.
C. Thermo-lag 330-3 Subliming Material System
     System Application 01 (15): Apply 5.08 cm (2.0 inches) 
minimum thickness of polyurethane foam then an 11-gauge steel jacket, 
then apply 0.010 cm (4 mils) minimum thickness of Thermo-lag Primer 
351-3 to the tank jacket, and then apply 0.343 cm (135 mils) minimum 
thickness of Thermo-lag 330-30 Subliming Compound. Next, apply 0.013 cm 
(5 mils) of Thermo-lag Topcoat 350-3.
     System Application 02 (27): Apply 5.08 cm (2.0 inches) 
minimum thickness of glass fiber then an 11-gauge steel jacket, then 
apply 0.010 cm (4 mils) minimum thickness of Thermo-lag Primer 351-3 
primer to the tank jacket, and then apply 0.46 cm (180 mils)

[[Page 26148]]

minimum thickness of Thermo-lag 330-30 Subliming Compound. Next, apply 
0.013 cm (5 mils) of Thermo-lag Topcoat 350-3.
     System Application 03 (28): Apply 2.54 cm (1.0 inch) 
minimum thickness of polyurethane foam then an 11-gauge steel jacket, 
then apply 0.010 cm (4 mils) minimum thickness of Thermo-lag Primer 
351-3 to the tank jacket, and then apply 0.457 cm (180 mils) minimum 
thickness of Thermo-lag 330-30 Subliming Compound. Next, apply 0.013 cm 
(5 mils) of Thermo-lag Topcoat 350-3.
D. Thermo-Lag 440 Subliming Material System
    System Application 01: Apply 0.013 cm (5 mils) of Thermo-lag 351-
176 Primer to the tank surface, then apply 0.419 cm (165 mils) of 
Thermo-lag 440 Subliming Material to the surface. Next, apply 0.005 cm 
(2 mils) of Thermo-lag 350-31 Topcoat.

12. United States Gypsum Company, Chicago, Illinois

A. Thermafiber Tank Car Fire Proofing
     System Application 01 (11): Apply 2.54 cm (1.0 inch) 
minimum thickness of Thermafiber Tank Car Fire proofing (density 
>=112.1 kg/m\3\ (7 lbs/ft\3\)), then an 11-gauge steel jacket.
     System Application 02 (20): (<288 [deg]C) Apply 2.54 cm 
(1.0 inch) minimum thickness of Thermafiber Tank Car Fire proofing 
(density >112.1 kg/m\3\ (7 lbs/ft\3\)), with a foil scrim polyethylene 
facing, then apply 10.16 cm (4.0 inches) of glass fiber compressed to 
7.62 cm (3.0 inches), and then an 11-gauge steel jacket.
     System Application 03 (26): (<288 [deg]C) Apply 2.54 cm 
(1.0 inch) minimum thickness of Thermafiber Tank Car Fire proofing 
(density >112.1 kg/m\3\ (7 lbs/ft\3\)), with a foil scrim polyethylene 
facing, then apply 2.54 cm (1.0 inch) minimum thickness polyurethane 
facing followed by 2.54 cm (1.0 inch) minimum thickness polyurethane 
foam, and then an 11-gauge steel jacket.
     System Application 04: (<288 [deg]C) Apply 2.54 cm (1.0 
inch) minimum thickness of Thermafiber Tank Car Fire proofing (density 
>=112.1 kg/m\3\ (7 lbs/ft\3\)), then apply 8.89 cm (3.5 inches) glass 
fiber insulation compressed to 7.62 cm (3.0 inches) and then an 11-
gauge steel jacket.
B. Inswool HP
    System Application 01: (<288 [deg]C) Apply 3.81 cm (1.5 inch) 
minimum thickness of INSWOOL HP ceramic fiber blanket (density <80.1 
kg/m\3\ (5 lbs/ft\3\)), then an 11-gauge steel jacket.

IV. Revisions to the List of Thermal Protection Systems Excepted From 
Test Verification

    Given that this list was last published in the Federal Register on 
May 13, 1993, (Notice No. 93-12; 58 FR 28436), PHMSA and FRA anticipate 
that changes have inevitably occurred since its most recent 
publication--including the potential that companies on the list have 
moved, changed tradenames, closed, merged with other companies, or have 
been purchased by other companies. Therefore, PHMSA is providing 
stakeholders with the opportunity to comment on and request revisions 
to the current list of thermal protection systems excepted from test 
verification. This notice is not a solicitation for systems not 
identified on the list. Any proposed revisions submitted in response to 
this notice must meet the criteria for revision in this section.
    For revisions to entries on the list:
     Persons requesting only a tradename change must submit 
information that the revision or change is not a new thermal protection 
system. Persons requesting further changes must submit a certification 
statement or test data and technical specifications demonstrating that 
the physical properties of the system have not changed. (See ADDRESSES 
and FOR FURTHER INFORMATION CONTACT.)
    PHMSA and FRA will evaluate the revisions and comments received in 
response to this notice, including review of certification statements, 
test data, and technical specifications demonstrating the system is 
compliance with appendix B to 49 CFR part 179. Once all comments have 
been evaluated, PHMSA will publish a follow-up notice in the Federal 
Register to provide the most up-to-date list of thermal protection 
systems excepted from test verification, including any revised entries. 
PHMSA will continue to maintain the list of thermal protection systems 
in the PHMSA Records Center and will also post a copy of the list to 
our website at http://www.phmsa.dot.gov, where future additions and 
revisions will be published.

    Signed in Washington, DC, on May 24, 2018.
William S. Schoonover,
Associate Administrator for Hazardous Materials Safety, Pipeline and 
Hazardous Materials Safety Administration.
[FR Doc. 2018-11988 Filed 6-4-18; 8:45 am]
 BILLING CODE 4910-60-P