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ASME B31.3 Process Piping Distortion (Dent) tolerance

ASME B31.3 Process Piping Distortion (Dent) tolerance

ASME B31.3 Process Piping Distortion (Dent) tolerance

(OP)
I am looking in ASME B31.3 for the distortion (dent) tolerance on process piping and have been unsuccessful. Please help in locating the section(s) which give the tolerance. Thank you.

RE: ASME B31.3 Process Piping Distortion (Dent) tolerance

I have not found any definition in B31.3, but in the gas code dents are defined in B31.8 Section 841.243 as follows,

Quote:


(c) All dents that affect the curvature of the pipe at the longitudinal weld or any circumferential weld shall
be removed. All dents that exceed a maximum depth of
1⁄4 in. in pipe NPS 12 and smaller or 2% of the nominal
pipe diameter in all pipe greater than NPS 12 shall not
be permitted in pipelines or mains intended to operate
at hoop stress levels of 40% or more of the specified
minimum yield strength. When dents are removed, the
damaged portion of the pipe shall be cut out as a cylinder.
Insert patching and pounding out of the dents is
prohibited.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: ASME B31.3 Process Piping Distortion (Dent) tolerance

(OP)
Thank you for the help and quick response.

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