46 C.F.R. § 54.10-5 Maximum allowable working pressure (reproduces UG–98).
Title 46 - Shipping
(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 §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 levels pertinent to this part of the regulations. It includes reference to section VIII of the ASME Code for definitions and explanations.
Title 46: Shipping
PART 54—PRESSURE VESSELS
Subpart 54.10—Inspection, Reports, and Stamping
§ 54.10-5 Maximum allowable working pressure (reproduces UG–98).
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 (§ 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 § 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.
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