For a FPSO topside engineering, the inertial accelerations in normal operation (rolling, pitching & heaving) are considered by structural design of all modules as 0.143g, 0.347g & 0.57g respectively. For extreme sea condition, it is 0.265g, 0.693g & 0.886g respectively.

I think due to structural dampening & friction at pipe support(except at anchor) the accelerations will be less on piping. If so, how to find out reduced acceleration for piping stress analysis. Please guide.
Regards,