| Applies To | |
| Product(s): | AutoPIPE |
| Version(s): | ALL; |
| Original Author: | Bentley Technical Support Group |
| Date Logged & Current Version | Feb. 2017 11.00.00.22 |
Problem:
Could you please explain why the maximum longitudinal stress is different between the 'General Pipe Stress' maximum longitudinal stress and the DNV (2012) code compliance maximum longitudinal stress check (Equation 40)?
Solution:
The issue here is not pipe wall thickness, but rather the way AutoPIPE calculates the longitudinal pressure stress. General stress is using actual pipe area instead of PD/4t.
When using DNV, setting the Long. Pressure (P/A/M/N) field from 'P' to 'A' fixes this issue. Again, the issue of the differences is not the thickness used - but the longitudinal pressure equation used.