46 CFR § 54.25-8 - Radiography (modifies UW-11(a), UCS-57, UNF-57, UHA-33, and UHT-57).
(a) Full radiography is required for all Class I and Class I-L vessels regardless of thickness. (Refer to table 54.01-5(b) for applicable requirements.)
(b) Class II-L vessels shall be spot radiographed. The exemption provided in UW-11(c) of section VIII of the ASME Boiler and Pressure Vessel Code (incorporated by reference; see 46 CFR 54.01-1) does not apply. (Refer to table 54.01-5(b) for applicable requirements.)
(c) Each butt welded joint in a Class II or III pressure vessel cargo tank must be spot radiographed, in accordance with UW-52, regardless of diameter or thickness, and each weld intersection or crossing must be radiographed for a distance of at least 10 thicknesses from the intersection.