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#13935 - 10/25/07 02:50 PM Restraint loading for cold empty line.
GGM Offline
Member

Registered: 11/06/06
Posts: 20
Loc: Alberta, Canada
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?
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GGM

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#13936 - 10/25/07 02:57 PM Re: Restraint loading for cold empty line. [Re: GGM]
Richard Ay Offline
Member

Registered: 12/13/99
Posts: 6226
Loc: Houston, Texas, USA
Use "WNC" instead of "W" in the appropriate load cases.

(WNC is "weight no contents".)
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Regards,
Richard Ay - Consultant

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#13957 - 10/26/07 08:58 AM Re: Restraint loading for cold empty line. [Re: Richard Ay]
GGM Offline
Member

Registered: 11/06/06
Posts: 20
Loc: Alberta, Canada
Thanks Richard, very easy solution!
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GGM

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