[Title 46 CFR 54.10-5]
[Code of Federal Regulations (annual edition) - October 1, 2006 Edition]
[Title 46 - SHIPPING]
[Chapter I - COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)]
[Subchapter F - MARINE ENGINEERING]
[Part 54 - PRESSURE VESSELS]
[Subpart 54.10 - Inspection, Reports, and Stamping]
[Sec. 54.10-5 - Maximum allowable working pressure (reproduces UG-98).]
[From the U.S. Government Publishing Office]
46SHIPPING22006-10-012006-10-01falseMaximum allowable working pressure (reproduces UG-98).54.10-5Sec. 54.10-5SHIPPINGCOAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)MARINE ENGINEERINGPRESSURE VESSELSInspection, Reports, and Stamping
Sec. 54.10-5 Maximum allowable working pressure (reproduces UG-98).
(a) The maximum allowable working pressure for a vessel is the
maximum pressure permissible at the top of the vessel in its normal
operating position at the operating temperature specified for that
pressure. It is the least of the values found for maximum allowable
working pressure for any of the essential parts of the vessel by the
principles given in paragraph (b) of this section and adjusted for any
difference in static head that may exist between the part considered and
the top of the vessel. (See UA-60 (a) of the ASME Code.)
(b) The maximum allowable working pressure for a vessel part is the
maximum internal or external pressure, including the static head
thereon, as determined by the rules and formulas in this Division (ASME
Code), together with the effect of any combination of loadings listed in
UG-22 of the ASME Code (see Sec. 54.01-30) which are likely to occur,
for the designated coincident operating temperature, excluding any metal
thickness specified as corrosion allowance. (See UG-25 of the ASME
Code.)
(c) Maximum allowable working pressure may be determined for more
than one designated operating temperature, using for each temperature
the applicable allowable stress value.
Note: Table 54.10-5 gives pictorially the interrelation among the
various pressure
[[Page 154]]
levels pertinent to this part of the regulations. It includes reference
to section VIII of the ASME Code for definitions and explanations.
Table 54.10-5--Pictorial Inter-Relation Among Various Pressure Levels With References to Specific Requirements
\1\
----------------------------------------------------------------------------------------------------------------
Pressures upon which
Pressure differential, psi \2\ Test pressures \3\ Relief device pressure relief device flow
settings capacity is based
----------------------------------------------------------------------------------------------------------------
Burst proof test (UG- ......................
101(m) of ASME Code).
Yield proof test (UG- ......................
101(j) of ASME Code).
Standard hydrostatic ......................
test (UG-99 of ASME
Code).
....................... ...................... Fire exposure, 120%
MAWP.
Pneumatic test (UG-100 ......................
of ASME Code).
....................... Rupture disk burst
(Sec. 54.15-13).
....................... ...................... Normal, 110% MAWP.....
------------------------------------
Maximum allowable Maximum allowable Maximum allowable
working pressure working pressure working pressure
(MAWP), UG-98 and UA- (MAWP), UG-98 and UA- (MAWP), UG-98 and UA-
60(a) of ASME Code. 60(a) of ASME Code. 60(a) of ASME Code.
------------------------------------
Design pressure, UG-21, Design pressure, UG-21 Design pressure, UG-21
and UA-60(b) of ASME and UA-60(b) of ASME and UA-60(b) of ASME
Code. Code. Code.
....................... Safety or relief value
setting (UG-133 of
ASME Code).
Operating pressure (UA- Operating pressure (UA- Operating pressure (UA-
60(f) of ASME Code). 60(f) of ASME Code). 60(f) of ASME Code).
----------------------------------------------------------------------------------------------------------------
\1\ For basic pressure definitions see Sec. 52.01-3(g) of this subchapter.
\2\ For pressure differentials above 3,000 pounds per square inch (p.s.i.), special requirements may apply.
\3\ For the basis for calculating test pressures, see UA-60(e) of the ASME Code.