Maximum Allowable Compressor Cylinder Flange Pressure Pulsation

Limit for the unfiltered peak-to-peak pulsation level measured at the compressor cylinder flange, as a percentage of average absolute line pressure

Maximum Allowable Pulsation Limits at and Beyond Line-Side Nozzles of Pulsation Suppression Devices

Limit of peak-to-peak pulsation levels at the side of the pulsation suppression device

Standing wave resonance calculator

A standing wave, also known as a stationary wave, is a wave which oscillates in time but whose peak does not move in space.

They occur inside a pipe due to interference between waves reflected back and forth from the pipe ends at the pipe acoustic natural frequency.

Standing waves don't form under just any circumstances. They require that energy is fed into a system at an appropriate frequency. When this exciting frequency equals the pipe acoustic natural frequency, resonance phenomenon occurs.

Comparing the pipe natural frequency with the main exciting frequencies generated by the compressor (i.e the multiples of compressor running speed, expressed in Hz) may help to identify possible acoustic resonances in pipe segments.

Speed of sound calculator