14. Stress summary Eq.9 appears to be ranging based on AutoPIPE's output report, why?


Applies To
Product(s):AutoPIPE
Version(s):ALL;
Area: Report
Date Logged
& Current Version
Oct 2023
23.00.00.230

Problem:

In the text output, as part of each stress summary, results are given at each node, eg as follows:

Point                             (Stresses in N/mm2   , Ratchet in deg C   )              Usage  
 Name                 EQ.9    EQ.10    EQ.11    EQ.12    EQ.13  Ratchet  Leakage    EQ.14   Factor  Notes
 ------           --------  -------  -------  -------  -------  -------  -------  -------  -------  -----
 
 *** Segment A  begin ***                                                       
 A00     Stress         50      140      884        -        -        -      140      442   0.0129  
         Allowable     142      283        -        -        -        -        -        -        -  
         Ratio       0.356    0.495        -        -        -        -        -        -        -
         Load Pair   55-56    52-54    52-54        -        -        -    52-54    52-54                  -

Why do the results give a load pair for equation 9? Equation 9 should not be ranging between load cases.

Solution:

Agree the range for Eqn 9 is not needed.  This was added by request to synch back to the fatigue report to figure out what load cases was causing the biggest problems. If not interesting for your review, suggest to ignore Eq 9 ranging. 

See Also

ASME BPV-III-1-ND, AutoPIPE Nuclear Piping Code FAQ

Bentley AutoPIPE