Dear Marchie,
You should avoid coincidence of mechanical natural frequencies with 10 harmonics of compressor. A simplified analysis of the piping system shall be performed to determine critical piping lengths that may be in resonance with acoustical harmonics.
Make sure that there is adequate separation between the fundamental running speed of the compressor and its harmonics and the mechanical natural frequencies of the system. 15% separation is reasonable.
Compressor harmonics are RPM/60 times 1,2,3,...,10.
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Regards,
Farhad Salehi
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