Thumb Rule to Identify the schedule number of pipe by direct measurement

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Dec 12, 2012, 1:43:15 AM12/12/12
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Thumb Rule to Identify the schedule number of pipe by direct measurement

 

Add three inches to the actual inside diameter; divide this

by the wall thickness; the schedule number can then be identified

by the following table:

 

Schedule 30          40 to 50

Schedule 40          29 to 39

Schedule 60          25 to 29

Schedule 80          20 to 23

Schedule 100        16 to 18

Schedule 120        13 to 15

Schedule 140        11 to 13

Schedule 160        9 to 11

 

Example. Pipe measures 12.5 inches inside diameter, wall

thickness .75 inch; 15.5/.75 = 20.2; pipe is Schedule 80, 14

inches outside diameter.

 

Note:

 

The rule fails on small diameter pipe (under 6 inches), and

also on schedules 10 and 20, because of the use of “standard”

thicknesses in this range.



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