Deck 24: Pipe Threads

Question 1

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

Answer 1

True

Question 2

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

Answer 2

True

Question 3

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

Answer 3

True

Question 4

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

Question 5

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

A)NPSC
B)NPSM
C)NPAL
D)NPSF
E)NPSI

Question 6

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

Question 7

The thread specification on a drawing should include:

A)The number of threads per inch
B)The thread series
C)The thread form
D)All of the above

Question 8

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

Question 9

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

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

Question 10

All pipe threads are tapered.

Question 11

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.

Question 12

NPT threads:

A)Are straight threads
B)Are tapered threads
C)May be straight or tapered

Question 13

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

A)NPSC
B)NPSM
C)NPAL
D)NPSF
E)NPSI

Question 14

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

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

Question 15

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

Question 16

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

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

Question 17

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

A)NPSC
B)NPSM
C)NPAL
D)NPSF
E)NPSI