liquid ring vacuum pump Maintenance

A cigarette factory has 2EB liquid ring vacuum pumps with three sets and two-purpose equipment, which provide centralized negative pressure for 20 sets of cigarette packaging units. The main parameters of liquid ring vacuum pump are as follows: absolute suction pressure 200 kpa, suction rate 53.3 m3/min and total suction rate 106.6 m3/min under saturated air condition. Denver soft starter MCD3000 is used to control the motor start-up operation. The actual operation of vacuum gauge pressure up to - 0.07 MPa, to meet the production needs.vacuum-system-application

I. Fault Phenomena

After two years of operation, the liquid ring vacuum pump appeared abnormal sound, the starting current was too large, the suction capacity decreased significantly, and the vacuum gauge pressure dropped to - 0.03 MPa, which prevented normal production.

2. Analysis of the Causes of Failures

After inspection, it was found that the scale inside the pump body was serious. Because the working fluid is clean water at room temperature, scales are formed after long-term operation. Scaling is caused by the presence of calcium, magnesium and other carbonates in the water. After the pump is heated and heated, its solubility decreases, and the molecules combine to precipitate to form scales.water-ring-vacuum-pump

Measures taken

1. The plate rotor is flushed with 6% hydrochloric acid, then rinsed with clean water, and the pump with thicker scale is disintegrated and removed.

2. Softening water by electronic water treatment instrument.
3. Install a filter on the water supply pipeline to prevent wear of parts in the pump or blockage of impellers.liquid-ring-vacuum-pumps