API 653 EXAM 3 QUESTIONS AND CORRECT ANSWERS ALREADY PASSED

what is the minimum thickness for a tank floor plate with no means for leak detection or secondary containment if an RBI program is not in place - ANSWERS 0.1 inch reference table 4.4 API 653 when a full hydrostatic test is required, it shall be held for - ANSWERS 24-hours reference 12.3.1 API 653 how many radiographs shall be taken in a square 2 in x 24 in but welded insert play in a 1-inch thick shell - ANSWERS 6 total one horizontal one vertical one in each corner : reference 12.2.1.6.2 API 653 what is the minimum number of radiographs that shall be taken on a circular but welded insert plate in a shell 1/2 in thick - ANSWERS one : reference 12.2.16 .1 API 653 how much time do you need to keep the radiographs of a reconstructed tank - ANSWERS 1 year reference 13.2.3 API 653 who should conduct visual inspection and review and NDE results? - ANSWERS the authorized inspector how much time should the operator keep the cathodic protection records - ANSWERS 5 years minimum diagnostic length of a radiograph is - ANSWERS 6 inches the total metal lost / the period of time over which the metal loss occurred is the - ANSWERS corrosion rate the presence of rock under the steel bottom of an AST would have what effect - ANSWERS promote severe Underside corrosion when do you use thin-film linings - ANSWERS when the tank is new or has light corrosion a formal visual external inspection by an authorized inspector shall be made - ANSWERS at least every five years or RCA / 4N years whichever is less radiographic density shall be check by densitometer calibrated on a step wedge film traceable to - ANSWERS a National Standard a welder deposits more metal than Allowed by the WPS what should be done - ANSWERS re-qualify the welder what is the maximum critical length for plate thickness determination - ANSWERS 40 inches when is it necessary for a hydrostatic test on a reconstructed tank - ANSWERS always between thin film and thick film Linings which lining is best for crude oil tank that operates at 190 degrees F - ANSWERS thin film what is the maximum spacing for MT prods - ANSWERS 8 inches what is the height of the lead symbol B that shall be attached to the back of each film holder during each exposure to determine if Backscatter radiation is exposing the film - ANSWERS 1/2 inch any work on a tank that changes its physical dimensions or configuration is called an - ANSWERS alteration which Annex of API 653 provides guides about above ground storage tanks inspector certification - ANSWERS Annex D