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Fittings practice questions

26 questions from the pipefitting and steamfitting practice test.

Fittings practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

Starting at which nominal pipe size does the outside diameter of steel pipe equal the nominal size?

  1. NPS 14
  2. NPS 8
  3. NPS 12
  4. NPS 10
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A. NPS 14

Through NPS 12 the outside diameter is larger than the nominal size (NPS 12 is 12.75 in OD). From NPS 14 up, the OD equals the nominal size. NPS 12 is the tempting answer because it is the last of the small-pipe series.

Reference: ASME B36.10 pipe dimensions

What is the actual outside diameter of NPS 2 steel pipe?

  1. 2.000 in
  2. 2.067 in
  3. 2.500 in
  4. 2.375 in
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D. 2.375 in

NPS 2 pipe measures 2.375 in (2-3/8 in) outside. 2.067 in is the inside diameter of Schedule 40 NPS 2, and 2.000 in is only the nominal name of the size.

Reference: ASME B36.10 pipe dimensions

What is the taper of standard NPT pipe threads?

  1. 1/4 in per foot
  2. 1/2 in per foot
  3. 3/4 in per foot
  4. 1 in per foot
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C. 3/4 in per foot

NPT threads taper 1 in 16 measured on the diameter, which is 3/4 in per foot. The taper is what wedges the threads together to form the seal as the joint is tightened.

Reference: ASME B1.20.1 pipe threads, general purpose

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