API 653 Exam Chapter 9

API 653 Exam Chapter 9 – Tank Repairs and Alterations

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1.

Q1. API 653: repair of defects in shell plate material
Which of the following is not an acceptable method of repairing a corroded area on a shell plate that is at its minimum design thickness?

 (a) Grinding out the corroded area to a smooth contour

 (b) Applying for a lap-welded patch plate over the defective region

 (c) Repairing the defective region with weld metal

 (d) Replacing the corroded region with a butt-welded insert plate

2.

Q2. API 653: repair of defective welds
Which of the following imperfections must always be repaired?

 (a) Existing weld reinforcement in excess of API 650 acceptance criteria

 (b) Existing weld undercut

 (c) Arc strikes either in or adjacent to welded joints

 (d) All of the above

3.

Q3. API 653: addition or replacement of shell penetrations
A new nozzle is to be installed in an existing shell. The nozzle is 4 in NPS. The shell is 5/8 in thick and does not meet the current design metal temperature criteria. How must the nozzle be installed?

 (a) With a butt-welded insert plate with a minimum diameter of 16 in

 (b) With a butt-welded insert plate with a minimum diameter of 8 in

 (c) With a butt-welded insert plate with a minimum diameter of 6 in

 (d) A nozzle cannot be installed under these circumstances

4.

Q4. API 653: addition or replacement of shell penetrations
A new nozzle is to be installed in an existing shell. The nozzle is 1 in NPS. The shell is 3/8 in thick. How must the nozzle be installed?

 (a) It can be installed directly into the shell

 (b) A nozzle cannot be installed under these circumstances

 (c) With a butt-welded insert plate with a minimum diameter of 2 in

 (d) With a butt-welded insert plate with a minimum diameter of 13 in

5.

Q5. API 653: repairing tank bottoms
A welded-on patch plate has been used to repair a defect within the critical zone on the tank bottom. Which of the following situations would be unacceptable?

 (a) The patch plate is 5/16 in thick

 (b) The bottom plate at the perimeter weld is 1/5 in thick

 (c) The plate perimeter weld has two weld passes

 (d) The patch plate is tombstone shaped and within 6 in of the shell

6.

Q6. API 653: repairing tank bottoms
A welded-on patch plate is not permitted in the critical zone of tanks operating at what temperature?

 (a) There is no stated temperature restriction

 (b) 100 °F for carbon steel and 200 °F for stainless steel

 (c) 100 °C for carbon steel and 100 °F for stainless steel

 (d) 200 °F for carbon steel and 100 °F for stainless steel

7.

Q7. API 653: replacement of entire tank bottom
A tank has its entire bottom replaced. Existing shell penetrations may not require raising if the tank material has a yield strength as follows:

 (a) ≤ 50 000 lbf/in2

 (b) >50 000 lbf/in2

 (c) ≤ 100 000 lbf/in2

 (d) >100 000 lbf/in2

8.

Q8. API 653: repair of fixed roofs
What is the minimum allowable thickness of new roof plates?

 (a) 1/4 in

 (b) 1/4 in plus corrosion allowance

 (c) 3/16 in plus corrosion allowance

 (d) 5/16 in plus corrosion allowance

9.

Q9. API 653: hot taps
Which of the following statements are true concerning hot taps?

 (a) They can only be done on tanks that do not need heat treatment

 (b) They cannot be carried out on tanks of unknown toughness

 (c) They cannot be used for openings greater than 4 in diameter

 (d) Hot taps fitted to the roof must be approved by the design engineer

10.

Q10. API 653: hot taps
What is the minimum height of liquid required above the hot tap location during hot tapping?

 (a) 12 in

 (b) 8 in

 (c) 3 feet

 (d) 5 feet

11.

Q11. API 653: minimum weld spacings
What is the minimum spacing in any direction between a hot tap
weld and adjacent nozzles in a tank 300 ft in diameter and 0.5 in thick?

 (a) 21 in

 (b) 30 in

 (c) 36 in

 (d) 42 in

12.

Q12. API 653: replacement shell plates
Which of the following statements are true when replacing entire shell plates or full height segments?

 (a) Vertical welds can be cut and re-welded in contravention of the spacing requirements in API 653 Fig. 9-1

 (b) Horizontal welds can be cut and re-welded

 (c) Horizontal welds must be cut at least 6 in beyond the new vertical weld

 (d) Horizontal joints must be welded prior to vertical joints

13.

Q13. API 653: shell repairs using lap-welded patches
Lap-welded patches must have rounded corners. What size corner radius should be used?

 (a) 1-inch maximum

 (b) 1-inch minimum

 (c) 2 inches maximum

 (d) 2 inches minimum

14.

Q14. API 653: NDE requirements
As well as section 12, is there is a summary list of the NDE requirements of API 653 hidden away?

 (a) Annex B

 (b) Annex F

 (c) Annex G

 (d) Annex H

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9.11 Repair and alterations: practice questions

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