Problem:
How does AutoPIPE Vessel calculates the Allowable Compressive Stress (fc) as per AD 2000?
Solution:
The AD-2000 code does not provide a direct calculation method or allowable value for longitudinal compressive stress (fc) used for Maximum Longitudinal Bending Stress verification.
AD-2000 Requirements
AD B6 requires that shell buckling caused by axial compressive loads be evaluated in accordance with DASt-Richtlinie 013. The code specifically states that axial loads exceeding those resulting from external pressure must be assessed using this referenced standard.
Therefore:
-
- AD-2000 does not define an allowable longitudinal compressive stress (fc).
- AD-2000 does not provide equations for calculating fc.
- The code delegates axial compression and shell buckling assessment to DASt-Richtlinie 013.
How AutoPIPE Vessel Calculates fc
Since AD-2000 does not include a direct procedure for determining allowable longitudinal compressive stress, AutoPIPE Vessel utilizes the CODAP Division 2 methodology to calculate fc.
AutoPIPE Vessel follows the buckling provisions from CODAP Division 2, Clause C9.1.4.5, which addresses compressive membrane stresses in shells.
The use of the CODAP methodology in AutoPIPE Vessel does not replace or override any AD-2000 requirement. Instead, it provides an engineering-based allowable stress value in an area where AD-2000 itself does not specify a calculation procedure.
Additional Information
For more details on the CODAP Division 2 implementation used by AutoPIPE Vessel, refer to: KB0051550 – Allowable Longitudinal Compressive Stress (fc) according to CODAP Division 2
See Also