Pulsations, or variations in pressure, can be a major cause of reliability problems, particularly in reciprocating compressor and pump systems. These pressure variations are the result of oscillatory flow (pulsative flow) induced by the fluid (gas or liquid) transmission equipment. The pulsation levels can be dramatically amplified if acoustical natural frequencies associated with the manifold and piping system are coincident with the excitation frequencies of the equipment.
Common Problems Associated with Pulsation
- Excessive Piping Vibration
- Reduced Valve Life
- Damage to Working Components of Pumps
- Cavitation
- Reduced Compressor Capacity
To minimize the potential for pulsation induced problems in reciprocating equipment, a pulsation analysis should be performed in the design stage. EDI routinely performs acoustical analyses and is a recognized leader in this industry. Click here to learn more about EDI’s acoustical simulation capabilities.
For existing systems, pressure pulsation can be measured. This is often required to accurately diagnose vibration or performance related problems. Note that pulsation may occur at very low frequencies (a few times per second) and/or at very high frequencies (several thousand times per second) depending upon the application. Special transducers are required since it is the time-varying (dynamic) component that is of interest. Piezoelectric pressure transducers are easy to use and have high accuracy and dynamic range, but are not capable of measuring static pressure. Strain-gage type transducers can provide both static and dynamic pressure levels, but require calibration prior to each use.
EDI is equipped with all types of pressure transducers and has the experience to troubleshoot pulsation induced problems.
