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Exam
: API-570
Title
: Piping Inspector
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1.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 2, Sch.80, A 106 B
2.375”
0.190”
0.03 inches/year 5 Years
MAWP:
A. 674 psig
B. 323 psig
C. 125 psig
D. Metal loss exceeds the requirements for 5 year inspection interval
Answer: A
2.What is the pressure design thickness of NPS 10, A516 Gr.65 Type 22 pipe that operate at 1200
psig/750°F
A. 0.432”
B. 0.46”
C. 0.928”
D. Not enough information given
Answer: B
3.A leak test is an alternative to inspection of buried piping.
What is the minimum liquid pressure to adequately conduct this test?
A. 1 1/2 times the MAWP
B. 1 1/4 times the MAWP
C. 10% greater than MAWP
D. Actual MAWP
Answer: C
4.For a single wall material thickness, over 0.375” through 0.50”, what is the hole type designation for a
source side penetrameter
A. 15
B. 17
C. 20
D. 25
Answer: B
5.Give the corresponding “P” number for SA 414 Gr.A material
A. 1
B. 2
C. 3
D. 11B
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Answer: A
6.On a class 1500 NPS 4 blind flange, what is the minimum thickness permitted?
A. 1.12”
B. 1.88”
C. 2.12”
D. 2.88”
Answer: C
7.For 1 1/4” thick carbon steel, what is the recommended preheat temperature?
A. 300°F
B. 235°F
C. 175°F
D. None
Answer: C
8.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. 160 psig
B. 550 psig
C. 723 psig
D. 125 psig
Answer: A
9.What is the inspection interval for buried piping without cathodic protection, the soil resistivity is 6,500
ohm-cm?
A. 10 years
B. 15 years
C. 5 years
D. whenever a leak is suspected
Answer: A
10.What is the maximum length allowed for individual slag trapped in a weld in a Severe Cyclic Conditions
piping system?
A. >TW X 3
B. £TW / 3
C. ³12T
D. 3/23”
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Answer: B
11.What is the design thickness of NPS 2 ½, SA106 Gr.B pipe that operates at 25 psi / 200°F
A. 0.275”
B. 0.100”
C. 0.002”
D. not enough information given
Answer: C
12.With respect to Category ‘D’ service, what is the maximum allowable undercut for a branch
connection?
A. Zero (no evident imperfections)
B. £ 1/32”
C. £ 1 mm
D. Both B and C
Answer: D
13.What is the test pressure of a metallic piping system whose design temperature is above the test
temperature using the following conditions? NPS 6, SA106 Gr.B, 100 psi / 800°F
A. 150 psi
B. 450 psi
C. 278 psi
D. Test temperature verses design temperatures are not different
Answer: C
14.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/750°F
NPS 6, A285 C EFW, Straight Seam(No radiography) 6 5/8” 0.280”
0.01 inches/year 5 Years
MAWP=
A. 522 psig
B. 487 psig
C. 878 psig
D. 125 psig
Answer: A
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