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Exam 24: Pipe Threads

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Question 1

Multiple Choice

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The designation for a tapered pipe thread used for a rigid joint is:

A) NPT
B) NPTR
C) NPTF
D) PTS-SAE SHORT

E) A) and C)
F) None of the above

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Question 2

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For tapered pipe threads, the taper is not normally shown on a drawing unless needed.

A) True
B) False

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Question 3

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Pipe threads are used in applications where a pressure-tight joint or mechanical connection is required.

NPT threads:

The designation for a tapered pipe thread used for a dryseal application, if extra clearance is required is:

All pipe threads are tapered.

The designation for a straight pipe thread used for a loose fitting mechanical joint where no internal pressures exist is:

The type of joint that is assembled without a sealer, and is used in automotive, aircraft, and marine applications is a dryseal pressure-tight joint.

The thread form for straight pipe threads is the same as the American National Standard taper pipe thread.

When taper is shown on a drawing of a tapered pipe thread, it is usually exaggerated to provide clarity.

The two types of pipe threads approved as American National Standard are tapered and straight.

The designation for a tapered pipe thread used for a pressure-tight joint, using a sealer, is:

The designation for a straight pipe thread used for a dryseal joint in soft or ductile material is:

Mechanical joints are not pressure-tight; they may be rigid or loose.

Straight pipe threads have a thread angle of 60 degrees, and a taper of 0.50 inches per foot.

The designation for a straight pipe thread used for a low-pressure-tight joint is:

The thread specification on a drawing should include: