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#53618 - 03/26/13 01:38 AM [HELP]Why do I get the two different result in releif load?
cacusies Offline
Member

Registered: 09/18/10
Posts: 11
Loc: China
Hello everyone (especially Richard Ay),

I am confused with the "Relief Load Synthesis" result which is the force of "thrust at valve pipe/vent pipe interface"&"thrust at vent pipe exit".

My input data are as follows: line tem. 500C,design pressure 7460Kpa,orivice ID 30mm,relief valve piping 96mm,vent stack length 6700mm, ratio of gas specific heats 1.3,gas constant 461.5 N.m./Kg./deg.K

I got the result which showed the interface force:9237N and the ventpipe exit force:4714N.

However, I check the result using the method of ASME B31.1 nonmandatory appendice II, which I got the F1 result:
5186N. This data is more nearly to the vent pipe exit force caculated by CAESAR II.
The input data of caculation by 31.1 is as the same as CAESAR II, which W = 12.4 lbm/sec (from caesar ii), A1=15.23in^2,h0=1463.37btu/lbm

How can I select for the piping stress caculation?

Thank first!


Edited by cacusies (03/26/13 01:51 AM)

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#53651 - 03/27/13 07:22 AM Re: [HELP]Why do I get the two different result in releif load? [Re: cacusies]
Richard Ay Offline
Member

Registered: 12/13/99
Posts: 6226
Loc: Houston, Texas, USA
There is nothing to select. You decide which load you want to analyze with, and specify this value in the dynamic (force set) analysis.
_________________________
Regards,
Richard Ay - Consultant

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