Restraint loading for cold empty line.

Posted by: GGM

Restraint loading for cold empty line. - 10/25/07 02:50 PM

I recently had a case where the cold shutdown condition caused the highest restraint loading. This is not correct because the line is empty of fluid in the cold case. I would typically set up my load conditions as:

1) W+T1+P1 (Hot operating)
2) W+T2 (Cold shutdown)
3) W+P1 (SUS)
4) W (pipe + fluid weight)
5) C1-C3 (Stress range from install to hot operating)
6) C 2-C4 (Stress range from install to cold)
7) C5-C6 (Stress range cold to hot)

I don't see anyway that I could change the load cases or fluid density to produce both hot and true cold restaint loading in a single run. Anyone have any ideas?
Posted by: Richard Ay

Re: Restraint loading for cold empty line. - 10/25/07 02:57 PM

Use "WNC" instead of "W" in the appropriate load cases.

(WNC is "weight no contents".)
Posted by: GGM

Re: Restraint loading for cold empty line. - 10/26/07 08:58 AM

Thanks Richard, very easy solution!