Liquid ring vacuum pump vexations

By OEM Update Editorial October 8, 2018 2:46 pm IST

Toshniwal’s liquid ring vacuum pump (LRVP) repeatedly tripped during high pressure, high flow conditions at start-up. Though the pump started working, it was noisy. On inspection, it was noticed that the pump was installed backwards. After reversing the direction of the pump, the motor became extremely hot and gave out low vacuum.

We’re operating at 300 torr with water. Why did this happen?
Solutions
Installing and operating a LRVP backwards will severely impact its operation. Since the vapour inlet port is several times larger than the outlet port, the smaller discharge port will cause a restriction and impede the flow of vapours into the LRVP. The resulting turbulence will create unusual noises.

The high motor temperature indicates high horsepower draw. Ampere readings can be taken off the motor leads to verify the approximate horsepower draw.

High draw is often the result of:
• High discharge pressure.
• Mechanical problems such as a bad bearing, foreign object or product buildup inside the machine.

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