Pulsation analysis and control

Positive displacement pumps or compressors are frequently used in many different applications. They share however one common problem: due to their working principle socalled pulsations will be generated.

Positive displacement pumps or compressors are frequently used in many different applications. They share however one common problem: due to their working principle socalled pulsations will be generated. The geometry of the connected piping and equipment can further amplify these pulsations due to acoustical resonances. These resonances may deteriorate the performance of equipment or, even worse, coincide with mechanical natural frequencies of parts, eventually leading to failure. Although the principle of acoustical and mechanical resonances is simple, solutions undertaken may reveal unexpected increase of problems if one does not fully understand the interaction between pump or compressor and load cases, duties and operating cases.

Baffle silencers, housed in rectangular or cylindrical enclosures, which include one or more acoustic absorbent baffles. Constructed as a cassette, each baffle contains the absorbent material that converts noise energy into friction heat. Different types of absorbent materials are used dependent upon specifications and noise attenuation. The baffle thickness (spacing and length) has two different functions, the amount of noise attenuation and the frequencies treated.