Hi,

I am performing fatigue analysis for a flow-line as part of a support modification project.

I have used the stress range curve for a F2 weld, as defined in BS7608. The model fails at a node associated with a support, i.e. there is no weld local.

I was wondering if it was acceptable to define different fatigue curves throughout a CII model.

The highest class defined in Table 7 of BS7608 is 'C'. Does anyone know if there are any appropriate curves for seamless pipe without welds? Or should I use a class C curve?

Best Regards,
Peter

You should be able to do this. At the appropriate point in the model, check the "Allowable Stress" checkbox and define new fatigue data. (Make sure you check the results.)

Thanks for the quick reply Richard.

Best Regards,
Peter