I am analysing a piping system connected to a STATIC vessel, due to chemical reaction with in this vessel, it generate lots of vibration which get transmitted to connected piping. To assess the effect of vibration on the piping life (Fatigue), client arranged the vibration measurement of the vessel (near the piping connection).

Normally vibration aspect is analysed Harmonic analysis but in this case since there is no rotating machine involved, forcing frequency is not known.

Hence I think response spectra analysis is much suitable in this case as the piping is supported significantly on the Vessel.

I want to seek opinion of the knowledgeable community. Please comment