Pipe Tolerances on OD & ID
Pipe Tolerances on OD & ID
(OP)
What are the size tolerances on OD & ID of say 8 Nom SCH 40 pipe.
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Pipe Tolerances on OD & ID
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RE: Pipe Tolerances on OD & ID
It depends on several factors.
According to ASME B36.10M it depends upon the Standard to which the pipe is being procured.
Assume that your pipe is ASTM SA-106 Seamless carbon steel pipe: There is a permissible variation (in the SA-106 specification of the ASME B&PV Code, Section II) on weight per foot, diameter and thickness.
Considering diameter and wall thickness: if you are procuring NPS 8, Schedule 40 pipe to ASME Standard SA-106, the outside diameter may vary no more than 1/16 inch over and 1/32 inch under the specified OD of 8.625 inch. The minimum wall thickness at any point shall not be more than 12.5 percent under the nominal thickness specified.
So you have to look at the specification for the specific pipe that you are procuring.
Regards, John.
RE: Pipe Tolerances on OD & ID
RE: Pipe Tolerances on OD & ID
+/-1% OD tolerance is common for pipe standards e.g. in Europe and so common practice also for many pipe manufacturers outside U.S.
RE: Pipe Tolerances on OD & ID