Shop Inspection

An authorized inspector s first step in the shop inspection of Code vessels is to review the design. It is the manufacturer s responsibility to submit drawings, calculations, and the following design information: dimensions, plate material specifications and thickness, weld detail drawings, calculated corrosion allowance requirements, design pressure and temperature calculations [see Code Pars. UG-20 and UCS-66], impact-test exemptions if allowed [see Code Pars. UG-20(f) and UCS-66], hydrostatic testing pressure (based on the maximum allowable working pressure) and the part of the vessel to which the maximum pressure is limited, calculations for reinforcement of openings, and the design requirements for the size and type of flanges which may be used on the vessel. It is especially important to indicate whether the vessel is to be postweld heat-treated and the degree of radiography because the Code generally allows 100 percent efficiency for double-welded butt joints that are fully radiographed, 85 percent efficiency for joints that are spot-radiographed, and 70 percent efficiency for joints not radiographed. Table 5.1 lists the various inspections, tests, and examinations which are established within the Code. This list is given to assist the reader in determining when certain tests, examinations, and inspections must be made.