Hi,

the purpose is to improve the actual pipe supporting, some components shall be replaced so a new calculation has to be done.

As I have no information regarding the realistic situation of the pipes (permanent strain, corrosion...) I aggre with you mariog that It would be correct to assume some conservative hypothesis like increasing number of cycles, or reducing the pipe thickness, corrosion allowance...

Anyway, I will check ASME FFs1 and API 579.

Thanks to everyone for your support.

Regards