API 653 Questions and Answers
1) __________ is a change from previous operating conditions involving different properties of the stored product such as specific gravity or corrosivity and / or different service conditions of temperature and / or pressure”
(a) Re-rating; (b) Change in service;
(c) Repair; (d) Reconstruction
REF : API-653, – 1.5.4
ANS : (b)
2) A __________ is a device used to determine the image quality of a radiograph.
(a) A step wedge comparison film; (b) A densitometer;
(c) A penetramter (d) All of the above.
REF : Section V, T-233
ANS : (c)
3) A corroded roof plate is found to have an average thickness of 0.1″ measured over an area of 100 sq. inches. This area shall be :-
(a) Repaired or replaced; (b) Found to be acceptable;
(c) Repair is prohibited; (d) Replacement is mandated
REF : API-653, 2.2.1.2
ANS : (b)
4) A double-welded butt joint is defined as :-
(a) A joint between two members that intersect at an angle between 0 degrees (a butt joint) and 90 degrees (a corner joint).
(b) A joint between two abutting parts lying in approximately the same plane that is welded from both sides.
(c) A joint whose size is equal to the thickness of the thinner jointed member.
(d) A joint between two overlapping members in which the overlapped edge is welded.
REF : 650 3.1.1.1
ANS : (b)
5) An external floating roof shall be provided with atleast one manhole having a minimum inside diameter of __________ inches.
(a) 18; (b) 15; (c) 24; (d) 30.
REF : 650 APP. C. 3.11
ANS : (c)
6) A formal Visual External inspection by a qualified inspector shall be done atleast :-
(a) Every 5 years of ¼ CR life whichever is less
(b) Every 5 years of ½ CR life whichever is less
(c) Every 2 years
(d) Every 1- years or ¼ CR life whichever is greater
REF : 653 4.3.2.1
ANS : (a)
7) A full hydrostatic test (when required) shall be held for __________ hours :-
(a) 24; (b) 8; (c) 18; (d) 12
REF : 653 10.3.1.1
ANS : (a)
8) A full-fillet weld is a weld that :-
(a) not less than 1/3 the thinner plate;
(b) the legs equal the thickness of the thinner plate;
(c) the largest isosceles triangle that can be inscribed within the cross section of the weld
(d) is atleast the thickness of the thicker plate
REF : API 650 3.1.1.7
ANS : (b)
9) A hot tap in a 1.25″ thick tank with a minimum metal temperature of 65oF at time of hot tap, without having material toughness data is :-
(a) not permitted; (b) permitted
(c) not enough information; (d) not addressed by the code
REF : API 653 – 7.13.4 & Fig. 7-5
ANS : (a)
10) A hydrostatic test for a relocated tank :-
(a) may be waived by the Owner / Operator; (b) is required;
(c) may be waived by the Inspector; (d) is not necessary
REF : 653 10.3.1.1 (a)
ANS : (b)
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