Very interesting discussion, Thanks to all,
Dear 09091960,
Do you mind to share the output (KP, depht, length, WT, ...) from IP with us? I am working on something and need it badly.
Thanks in advance,
I think you can calculate the stresses based on Leff. which is the length of the pipe with simiar behaviour but for fix-fix (or pin-pin i can't remember)
For external pressure design we need to know maximum difference between external and internal pressure. So, the phenomena such as Tide, Wave, and storme surge should be considered for calculating the external pressure. For internal pressure the minimum pressure the the condition of interest...