Applies To
	Product(s):	AutoPIPE
	Version(s):	2004, XM, V8i
	Environment:	N/A
	Area:
	Subarea:
	Original Author:	Bentley Technical Support Group
	Date Logged & Current Version	June 2015 09.06.02.06

Problem:

With ASME B31.1 piping code, which equation does the program uses for thermal stress in AutoPIPE?

There are two equations that address the thermal stress in the power piping code and the process piping code. Both equations are listed  in ASME B31.1 Power piping code and B31.3. Process piping code. One is very conservative eq. 1A.  The second eq. 1.B.  Is  much more liberal. The reason i am asking this question is that if your system fails eq. 1A does not mean that the  system actually fails until it fails eq 1b.

Answer:

To the CAE development team, ASME Eq 1b is know as Sustain Load Margin. AutoPIPE has a feature under Tools> Model Options> Results> Sustain Margin that always includes, only includes when needed, or to never be considered in a model analysis. See online help for more details on this feature. 

If you do not know about these settings, suggest that you take some time and review each one as they are very important to your analysis results.

See Also

Bentley AutoPIPE

External Links

Bentley Technical Support KnowledgeBase

Bentley LEARN Server

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