Hello,

I want to hear any advise about workflow for harmonic dynamic analysis of existing piping connect to reciprocating compressor.

There is piping vibration issue at site, a third party had processed vibration velocity measurement versus frequencies base on EI guideline and the lines are falling in concern/problem categories which require further assessment

Below is as far as I know:

#1:
The lines/system have to be modeled by CII with accurate in boundary conditions (support stiffness, clearance, friction, nonlineae support, etc.) then calculate MNF. But there will be error margin -/+20%. Should experiment modal analysis is preffered? How the modal test results will be handle after that?

#2:
Process to measure displacements at some test point locations. But at which frequencies?

#3
Input measured displacements into CII model as Harmonic Displacements. And compare calculated stress with endurance limit of the material.

Looking for comments