Dave and AGA 76,

I am new to pipe stress analysis.

AGA 76 said that the response in the pump is by mechanical vibration and then the displacement need to be included. Is that the displacement of the pipe? The displacement is measured and included in the Harmonic Analysis?

And, how one to identify flow-induced vibration and mechanical vibration?

I am working on preheater pipe by vibration and I do not know what causes the pipe to vibrate excessively.

Please advice.

Thank you.