API 653 Question Bank (API 653 QB001)

1. A corroded area of a tank bottom plate is repaired by welding overlay. There is no change in the rating and no change is made on the nameplate. Which of the following is the correct term to describe this process?

a. Reconstruction 

b. Repair

c. Alteration

d. None of the above

12. The maximum interval between internal inspections shall not exceed ____ years when corrosion rate is known:

(a) 10;

(b) 20;

(c) 5;

(d) 15.

13. Hot taps are not permitted under which of the following conditions?

a. On plates requiring PWHT.

b. On ultrasonically sound plate

c. On tanks with dia. more than 80 feet.

d. None of the above.

14. A tank of 160 ft diameter is to be checked for shell settlement. Minimum number of equally spaced settlement points to be checked will be:

a. 16

b. 20

c. 24

d. 12

15. For a tank made by reconstruction, under what circumstances may a new shell-to-bottom weld be exempt from hydrostatic testing?

a.  When the root pass has been visually inspected and the final weld is fully examined, visually and radiographically.

b.  Reconstructed tank is never exempted from hydrostatic testing.

c.  When the root pass has been visually inspected and the final weld is fully examined, visually and by vacuum box.

d. When the welding method has been reviewed and approved by an engineer experienced in tank design in accordance with API Standard 650.

16. In atmospheric conditions, bottom coatings may be applied if the steel temperature is:

a. 2°F above the dew point

b. 5°F below the dew point.

c. 10°F above the dew point.

d. At the dew point.

17. Procedure qualification for welding during repair of tanks is done in accordance with:

a. AWS D1.1

b. API 1104

c. ASME Section IX

d. All of the above

18. Widely scattered pits may be ignored under the following conditions 

a. Where the service fluid is corrosive or hard to hold.

b. If sum of pit lengths along any 8” vertical line does not exceed 2”

c. When no pit has depth which results in the minimum thickness being less than one-half the minimum acceptable thickness of the shell plate exclusive of corrosion allowance

d. b and c

19. For verification of radiographic sensitivity and image quality, which of the following   are used:

a. Cassettes 

b. Penetrameters

c. Cameras

d. Collimators

20. Internal corrosion in the vapour space above liquid level occurs due to:

a. Hydrogen Sulphide vapour      

b. Water vapour 

c. Oxygen                                     

d. Any combination of the above three

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