API 653 Question Bank (API 653 QB001)

Follow same instructions which is said in API 570 and API 510 Questions Banks

1. The complete or partial removal and replacement of more than 12 inches of a vertical weld joining shell plates is considered a:

(a) minor alteration;

(b) minor repair;

(c) major alteration;

(d) major repair.

2. A single film technique was used to make a radiograph using a Cobalt-60 source. The minimum permitted density in the area of interest is:

a. 4.0

b. 1.8

c. 2.0

d. 1.3

3. Cathodic protection is achieved by directing the flow of current from:

a. A cathode to anode

b. An anode to cathode

c. Both installations are acceptable

d. Neither of a and b

4. __________ 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

5. Describe how a liquid penetrant examination should be performed in order to detect discontinuities which are open to the surface.

a. Clean the part, apply the developer, apply the penetrant, remove excess penetrant, inspect the part, clean the part

b. Clean the part, apply penetrant, remove excess penetrant, apply the developer, inspect the part, clean the part

c. Clean the part, apply the developer, apply the penetrant, inspect the part, remove excess penetrant, clean the part

d. Clean the part, apply the developer, apply the penetrant, inspect the part, clean the part

6. A radiographic technique in which radiation passed through two walls and both the walls are viewed on the same radiograph (double wall, double image – ellipse) the limitation for the outside diameter is:

a. 3-1/2”

b. 2”

c. 4”

d. Any diameter possible

7. Information needed when determining the rate of corrosion:

a. Original thickness or last inspection thickness

b. Current thickness

c. Length of time in service

d. All the above

8. The maximum acceptable undercutting for base metal in reconstructed tank for horizontal welds is:

(a) 1/64";

(b) 1/32";

(c) 1/16";

(d) 1/8" 

9. Tank was inspected in 1985 and the thickness was observed to be 0.32 inch. The thickness observed during inspection in 1995 was 0.30 inch. What is corrosion rate?

a. 2 mpy

b. 20 mpy

c. 0.2 mpy

d. 1 mpy

10. If remaining corrosion allowance (RCA) at present is 0.05 inch, the next thickness inspection due for above tank shall not be later than:

a. 10 years

b. 15 years

c. 6 years 

d. 12.5 years

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