How to detect cavitation from changes in the pressure gauge reading behind the pump
Thread Content
There is a 12.5-ton, 50-meter-long small water pump, with the piping before and after the pump being DN50 in diameter. Upon starting up, it was observed that the reading on the 1MPA pressure gauge fluctuated between two values. Another phenomenon was that when the valve was slightly loosened, the pressure dropped to 0.42MPA before gradually rising back to 0.52MPA. This behavior occurred several times. Since the pump is part of a primary/backup system, the same situation arose when the backup pump was used as well; the vibration and temperature levels of both the pump and the motor were normal. Inspection revealed a leak at the water supply inlet of the tank. Could cavitation be causing problems with the pressure gauge?
The presence of air in the inlet pipeline may be due to a poor seal in the inlet pipeline, or because the pipeline is too long or too thin. In the case of normal cavitation, the sound of the pump can be heard