What causes vibration in the inlet pipeline of a centrifugal compressor?

What model are you using? It seems that the pressure in the imported pipe is too high; if it has a filter, try changing the design of that filter

Personal opinion: Whether mechanical resonance occurred in the pipeline. It may be the impact force of airflow pulsations that causes mechanical vibration in the pipeline. This is addressed by adding new supports to the piping system and reinforcing the existing supports.

Analysis of the causes of vibration in imported pipelines; I would like to share with you the actual findings regarding the causes of vibration in the compressors at our factory, in the hope that it may provide some insights. Below are the specific analysis results. Appendix: Analysis of the reasons for vibration in the after-cooler of Air Compressor #10 at Station 2: The Air Compressor #10 at Station 2 is a product of Liuzhou Air Compressor Factory; it was installed in 1996 and put into operation in the same year. The aftercooler for this machine is not part of Liu Kong’s supply scope; it is instead spare parts that are in our factory’s inventory. Since its commissioning, this machine has suffered from the problem of high exhaust temperature. After analysis, the cause was found to be insufficient cooling area of the aftercooler; therefore, the workshop replaced the aftercooler in the second half of 1999 to increase its cooling area. After the project was implemented, the exhaust temperature decreased. However, the unit began to vibrate, with the vibration amplitude exceeding the specified values, which posed a threat to the safe operation of the unit. As a result, on October 17, relevant personnel tested the vibration frequency of the unit and analyzed its vibration patterns. A data collector was used to measure the vibration frequency of the unit; the test locations were the high-pressure cylinder, exhaust pipe, and aftercooler of the main engine, and the measured vibration frequency in all cases was 115 Hz. Based on the analysis of the above data, the vibration of this unit is caused by resonance between the pulsation frequency of the main engine and the natural frequencies of the exhaust pipe and the aftercooler. The solution is to arrange the piping system appropriately based on the resonance frequency, so as to counteract the pulsations of the main unit and achieve a satisfactory vibration reduction effect.

When temperatures rise in summer, the amount of air cannot increase. This is normal. As the temperature rises, gas molecules become more active, resulting in a decrease in the number of molecules per unit volume, which in turn means a reduction in flow rate. The basic method to solve the above problem: reduce the temperature of the inlet air. Specific methods: 1. Increase the water flow rate to the inlet cooler. 2. Lower the temperature of the circulating water. 3. Install spray pipes outside the inlet pipeline

Thank you all for your feedback~ However, as the temperature rises the air volume decreases, so why is the inlet pipeline vibrating? The pressure difference of the accompanying air filter has reached the alarm level, but the automatic backwashing effect is not very good; this must be one of the reasons If the performance of the filter improves, will this phenomenon be eliminated? The cooler has a good heat exchange performance, with a temperature difference that is within normal limits.

Compressor inlet temperature: as the gas volume increases, the mass per unit volume decreases, so the mass flow rate drops. When the amount of intake air decreases to a certain level, the compressor will experience surge. When the air volume entering the compressor decreases and the negative pressure increases, the inlet pipeline vibrates. Finding a way to reduce the temperature of the incoming gas will eliminate the vibration.