Common Problem

Malfunction

Reasons

Processing methods

 High water level in 1. pump

 Ø check and adjust water level to normal level

Initiation difficulties

 2. power supply issues

 Ø check for power or short circuit

 Killed during commissioning or operation

 3. scaling is serious

 Ø removal or pickling

 4. packing gland is too tight

 Ø relief gland bolts

 5. rust on internal parts

 Ø force the rotor and wash it with oxalic acid

 6. foreign body stuck in pump rotor

 Ø water scour and open check

1. Control Cabinet Current Protection Adjustment

Adjust Ø current rating of thermal relay

 Motor short circuit or overload

 2. winding

 Ø check motor winding

 3. fluid flow is too high

 Ø water intake valve reduces working fluid flow

 4. exhaust pressure is too high

 Ø reduce exhaust pressure to specified range

 5. high liquid content in inhaled gases

 Add separator at Ø entrance and reduce working fluid flow

1. scaling is serious

Ø removal and removal of active pickling

Low vacuum

 2. belt slip causes speed drop

 Ø tighten belt

 3. Insufficient or excessive supply of water

 Ø regulating water supply and reducing working fluid temperature

 4. vacuum leakage

 Ø check for leakage in packing line and pump clearance

 5. vacuum table shows incorrect

 Ø replacement of vacuum gauge

 6. valve plate

 Ø replacement valve plate

1. high temperatures lead to cavitation

Ø use of cooling water

 2. gas friction or ejection

 Ø the vent out

High vibration and noise

 3. axis alignment is not good

 Ø re-neutralize lock

 4. anchor bolts loose

 Ø tighten anchor bolts

 5. fluid flow is too high

 Ø installed orifice flowmeter to reduce flow

 6. suction tube is too thin

 Ø use a thicker tube wall

1. belt is too tight

Ø relax belt properly

 2. motor reducer water ring pump misalignment

 Ø re-entry

 Heating at the bearing

 3. lubricating grease lacking or excessive

 Ø Improved lubrication conditions

 Improper installation of 4. bearings

 Ø adjustment bearings

 5. bearings rusted, raceways scratched

 Ø replacement of new bearings