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purushpiping
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Join Date: Aug 2009
Posts: 13

Outer Diameter of Pipe

04/03/2010 6:28 AM

Thanks for the responses over the captioned subject.I am also aware that by knowing thw flow and velocity we can find only th ID of the pipe.

I have received a piping calc from our vendor, in the sheet they have first calculated the OD of the pipe and the thickness of the pipe was calculated from the ASME B31.1

tm=PD/2(SE+PY)+A where D is the outer dia.

How they are fixing the OD first and calculated thickness.?
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Hendrik
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#1

Re: Outer Diameter of Pipe

04/03/2010 9:30 AM

It is normal for sales to work on nominal sizes and class. The calculations are done for them by computer program or friction chart actually working on ID.

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Anonymous Poster
#2

Re: Outer Diameter of Pipe

04/03/2010 12:01 PM

They are fixing the OD because that is the way to do it (standard available pipe).

By all means, if you want to perform a different calculation and come up with a 9" NPS pipe (9.5" OD?) go ahead. (Good luck getting any fittings that will match up to that custom pipe: flanges, elbows, tee's, .... )
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