Pulsation/Vibration Analysis on Piping Systems of Reciprocating Compressors/Pumps

Summary

Reciprocating compressors or reciprocating pumps may cause severe pulsation and vibration of piping systems resulting in damages of pipes, supports, foundations and instruments, or may result in unstable process operation or malfunction of instruments.
The pulsation and vibration analysis of reciprocating compressor/pump systems are required at the design stage to prevent such undesirable conditions.

Based on broad experiences and highly specialized knowledge on the design and operation of a variety of reciprocating compressor/pump systems, TOYO implements pulsation analysis as per API 618/674 and studies countermeasures for pulsation suppression when required.

Application Example of Pulsation Analysis on Reciprocating Compressor

Severe vibration with 700 micro-meter peak to peak displacement was observed at compressor cylinder head. Fig.1 shows discharge piping system of compressor final stage.
A pulsation analysis was carried out for this system. Installation of orifices and modification of pipe dimensions were implemented based on this analysis to suppress pulsation levels. These countermeasures satisfactory reduced the vibration at the compressor cylinder head and enabled continuous operation of this system.

Fig.2 and Fig.3 show analysis and measurement results of the pressure pulsation at the discharge separator. These graphs show that the analysis result fairly agrees with the measurement result.

Fig.1 Discharge Piping System at Compressor Final Stage

Fig.1 Discharge Piping System at Compressor Final Stage

Fig.2 Measurement Results of Pressure Pulsation
Fig.2 Measurement Results of Pressure Pulsation
Fig.3 Analysis Results of Pressure Pulsation
Fig.3 Analysis Results of Pressure Pulsation