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API Piping Inspector Sample Questions:
1. A piping system started with a wall thickness of 0.375 inches. Over a five year period the wall thickness is now 0.1".
What is the long term corrosion rate?
A) Not enough information given
B) 550 Inches per year
C) 0.005 inches per year
D) 0.055 inches per year
2. A leak test is an alternative to inspection of buried piping.
What is the minimum liquid pressure to adequately conduct this test?
A) 1 1/4 times the MAWP
B) 1 1/2 times the MAWP
C) Actual MAWP
D) 10% greater than MAWP
3. Determine the MAWP of the following piping system , at the next inspection, based on the following Design pressure/temperature Pipe description Outside diameter of pipe, D Thickness determined from Inspection Observed Corrosion Rate Next planned inspection 100 psig/100°F NPS 20, Sch. std, A 106 B 20"
0.280"
0.02 inches/year 5 Years
MAWP=
A) 723 psig
B) 550 psig
C) 125 psig
D) 160 psig
4. A DC yoke shall have a lifting power of at least
A) 10 lbs.
B) 8 lbs.
C) 40 lbs.
D) 5 lbs.
5. What the MAWP is recalculated, the wall thickness used shall be the actual thickness minus:
A) The estimated corrosion loss before the date of the next inspection
B) Twice the estimated corrosion loss before the date of the next inspection
C) The estimated corrosion loss before the date of the next inspection
D) Three times the estimated corrosion loss before the date of the next inspection
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: D | Question # 3 Answer: D | Question # 4 Answer: C | Question # 5 Answer: B |
By Barton
