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Section B31.1, Power Piping

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Section B31.1, Power Piping

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Friendly Note:
These practice questions and answers are here to help you test your knowledge and get more comfortable with code concepts. Keep in mind that codes like ASME and NBIC are updated from time to time. That means an answer here might not always match the latest edition. Always double-check with the current Code and your local requirements when it really counts!

Mode 1 - Chapter I, Chapter II Parts 1 & 2

Question 1.1 - Chapter II Parts 1

Q: What weld joint efficiency factor would apply when using electric resistance welded pipe?

a) .60
b) .80
c) .85
d) 1.00

c) .85

Question 1.2 - Chapter I

Q: Boiler external piping within B31.1 includes ________?

a) high-pressure, high-temperature water boilers exceeding 160 psi and 250° F
b) high-pressure, high-temperature water boilers exceeding 15 psi and 220° F
c) 10 psi steam piping
d) 200 psi water piping at 212° F minimum

a) high-pressure, high-temperature water boilers exceeding 160 psi and 250° F

Question 1.3 - Chapter II Parts 1

Q: The shortest distance from the root of a fillet weld to its face is defined as __________?

a) short span
b) the leg
c) the actual throat
d) the size of weld

c) the actual throat

Mode 2 - Chapter I, Chapter II Parts 1 & 2

Question 2.1 - Chapter II Parts 2

Q: When determining the required minimum wall thickness of straight pipe under inter­ nal pressure, what value of “Y” would apply for ferritic steels with a maximum tem­ perature of 750° F?

a) 0.3
b) 0.5
c) 0.7
d) 0.4

d) 0.4

Question 2.2 - Chapter II Parts 2

Q: When using the pressure/temperature ratings for B16.5 flanges, what maximum pressure class rating is permitted for an NPS 16 slip-on flange?

a) class 150
b) class 300
c) class 600
d) class 900

b) class 300

Question 2.3 - Chapter I

Q: Drum-type boiler [Fig. 100.1.2(b)] feedwater system piping shall meet the requirements of _______________?

a) 122.1.2
b) 122.1.5
c) 122.1.4
d) 122.1.3

d) 122.1.3

Mode 3 - Chapter II Parts 1 & 2

Question 3.1 - Chapter II Parts 1

Q: Internal design pressure shall be not less than __________________?

a) MAWP
b) 50% external design pressure 
c) operating pressure
d) MSOP

d) MSOP

Question 3.2 - Chapter II Parts 2

Q: Ferrous pipe is bent to a radius of bend 6 pipe diameters. The pipe has a schedule 40 wall thickness. What is the permitted difference between the maximum and minimum diameter after forming compared to the maximum and minimum diameters before forming?

a) 2%
b) 4%
c) 6%
d) 8%

d) 8%

Question 3.3 - Chapter II Parts 2

Q: Design temperatures for piping are established based upon __________?

a) maximum sustained condition expected
b) average metal temperature during startup
c) design temperature when safety valves lift
d) transient temperature ratio

a) maximum sustained condition expected

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