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	July 2015 09.06.02.06

Problem:

When comparing the hand calculated hoop stress results with that calculated by AutoPIPE they are different, why?

Y = 0.50, 06.24, or 0.7 

Solution:

First be sure of the calculation used by AutoPIPE is the exact same calculations used by Hand. 

Please see the following AutoPIPE help section:
Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> ASME B31.1 (2012)> Hoop stress Calculations:

User Equation 3 from Above help section

  Be sure to check the values used by AutoPIPE in the model listing report and Analysis summary:

Pipe Properties:

Analysis Summary settings:

Here is the problem, the Tools> Model Options> Y factor setting was found to be 0.40 instead of the 0.624 value used in the hand calculations.

Workaround: Updating this Y - Factor value will yield the correct Hoop stress value in AutoPIPE as calculated by hand.

 

See Also

ASME B31.1 Piping Code Calculation Issues

Comments, Questions, and Answers about Hoop code combination

Bentley AutoPIPE

External Links

Bentley Technical Support KnowledgeBase

Bentley LEARN Server

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