NPS
NPS
(OP)
hi all, please is there any formular or method i can apply to get the outside diameter of a pipe given the norminal pipe size.without the aid of a table.
thanks
thanks
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RE: NPS
http://virtualpipeline.spaces.msn.com
"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain
RE: NPS
No there is no equation because there is no rational reason. We have what we have (from the old IPS days) and it has been that way so long that we cannot change it now.
BigInch, you will love this one (I got it from a thread in the ASME Code discussion):
Interpretation: 2-10
Subject: Outside Diameter Tolerances
Date Issued: July 3, 1990
Question (1): Does B16.5-1988 have any requirements for tolerances on flange outside diameters?
Reply (1): No.
Question (2): Why not?
Reply (2): The ASME B16 Committee does not respond to questions about rationale for requirements.
John
RE: NPS
RE: NPS
I've archived it for future reference.
http://virtualpipeline.spaces.msn.com
"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain
RE: NPS
RE: NPS
Thanks that is a good one.
John
RE: NPS
If you eliminate the infrequently used sizes, e.g. 2 1/2 etc., you are down to 13 sizes or so. 10" and 12" have ODs 0.750 larger than the nominal ID. That is, 12" pipe has an OD of 12.750. 6" and 8" have ODs 0.625 larger than the nominal ID.
That brings you down to 11 sizes or so to remember. The numbers get odder as you go down in pipe size due to historical factors, but I it not a huge task to memorize them.
RE: NPS