API 653 Recertification Quiz with100% Correct Answers

API 653 Recertification Quiz with100% Correct Answers The perimeter welds on a welded-on patch plate in the critical zone should be ? - ANSWER -Two-pass and examined visually and by either MP or PT. Existent welds on a tank shell are found to e closer than allowed by API 650 (7th Edition). Under what conditions can these welds be considered to be acceptable for continued service? - ANSWER -Examined by MP inspection with no rejectable indications. The requirements of which standard shall be considered in the evaluation and alteration to the tank roof and roof-to-shell junction ? - ANSWER -Current applicable standard Welding procedure for ladder and platform assemblies, but not their attachment to the tank? - ANSWER -Shall comply with either AWS D1.1, AWS D1.6 or ASME Code Section IX. In floating roof tanks, shell nozzles without internal piping within operating range of the floating roof shall be supplied? - ANSWER -Flush on the inside of the tank. The attachment welds of new lap-welded shell patch plates shall be examined by: - ANSWER -Visually and by either MP or PT What is the minimum external projection outside the shell for bottom plates in a new tank? - ANSWER -2 inches Subject to the purchaser's approval, where normalized plates are required? - ANSWER -Thermo mechanical control process (TMCP) plates may be used. During welding operations the inspector should confirm - ANSWER -The welding parameters are supported by the WPS and WPQ If a release prevention system utilizing a nonconductive, impervious external liner is installed under a new tank, what should be done? - ANSWER -Anodes shall be placed between the external liner and the tank bottom in a conductive material. The activity that is used to a currently determine the remaining bottom thickness in areas where indications are found it is called? - ANSWER -Sizing (Proc up) Minimum dimension of a shell flash patch? - ANSWER -12" Max size of shell Lap-patch? - ANSWER -48"x72" Minimum repair plate dimension? - ANSWER -4" The likelihood of caustic stress corrosion cracking can be reduce by: - ANSWER -Stress relieving Scribe the flexible joint across the two moving faces and raise end of swing line to check? - ANSWER -Joints freedom of movement Minimum size of bottom lap-patch that does not cross a bottom seam? - ANSWER -6" Minimum amount of shell UT on shell plate? - ANSWER -At least 5 equally spaud areas for UT. On fixed roof, planks long enough to span at least - ANSWER -Two roof raffer At what PH does a thin iron sulfide layer deposit on the steel and provides some protection to corrosion - ANSWER - 4.5 Max Temperature for Coal tar Epoxy - ANSWER -120F to 170F where gas-tight roofs are required - ANSWER -Leak testing may be accomplished The present of clay, wood, gravel, or crushed stores as contaminants in a sand pad may cause - ANSWER -Pitting corrosion at each point of contact Holiday testing of thin-film linings should be performed with? - ANSWER -Low voltage wet sponge detector Anchor bolts that's have distortions or excessive cracking may be indications of: - ANSWER -Serious foundation settlement or a Tank overpressure uplift condition. what happen when concrete has been exposed to sufficiently high temperature for a period of time. - ANSWER -Loss of water of hydration (Calcining) The permeability of a leak detection barrier shall not exceed - ANSWER -1 × 10 7 cm (4 × 10-5 mils) per second Per API 653 , with of the following is required when converting an existing tank to When installing a new nozzle in a tank of unknow material, what stress value should be used to calculate the required shell thickness and reinforcement? - ANSWER -20,000 lbf/in2 In regards to underside corrosion on tank bottoms, the corrosion rate of steel in a wet environment. - ANSWER -may double with every 18 °F increase in temperature above 77 °F. Grade 350W/50W is acceptable for tank plate to a maximum thickness of: - ANSWER -45mm (1.75in) if fully killed and made to a fine grain practice. If an RBI assessment has been conducted and the tank has a release prevention barrier, the maximum initial inspection interval is: - ANSWER -25 years As an alternative to the procedures in API 653 for the evaluation of any thinning of the tank shell below minimum required wall thickness may be evaluated for continued service using which code? - ANSWER -API RP 579, section 4, 5 or 6. When welding on a tank shell constructed of Group I steel that is greater than 1.5 inches thick below what minimum metal temperature ?preheat? - ANSWER 200°F When evaluated an existing temperature services tank, which has a successful service history of operation but was not originally designed and constructed to the requirement of API 650, appendix M, which condition temperature has to be used? - ANSWER -The max Operating Temperature shall not exceed the temperature at