Screw pump common faults and elimination methods

Loud vibration

1)Suction line or pump suction end leakage or blockage;

2)The suction height exceeds the suction vacuum height of the pump;

3)bearing failure

1)Eliminate air leaks or clogs;

2)Reduce suction height to reduce pipe resistance

3)bearing replacement

Large pressure fluctuation

1)Suction line or pump suction end leakage or blockage;

2)The suction height exceeds the suction vacuum height of the pump;

1)Eliminate air leaks or clogs;

2)Reduce suction height to reduce pipe resistance

• flow coast-down

1)Suction line or pump suction end leakage or blockage;

2)The suction height exceeds the suction vacuum height of the pump;

3)The speed is too low;

4)Screw sleeve, pump bushing wear;

5)Shaft seal leaks.

1)Eliminate air leaks or clogs;

2)Reduce suction height to reduce pipe resistance

3)Increase the speed;

4)Replace worn parts;

5)Repair and replace shaft seal components.

Can't pump up the volume

1)Suction line or pump suction end leakage or blockage;

2)The suction height exceeds the suction vacuum height of the pump;

3)Screw sleeve, pump bushing wear;

4)The shaft turned in reverse.

1)Eliminate air leaks or clogs;

2)Reduce suction height to reduce pipe resistance

3)Replace worn parts;

4)Adjust motor steering.

power augmentation

1)The viscosity of the conveying medium increases;

2)Severe wear inside the pump;

3)Pumps and motors are different;

4)The outlet line is blocked.

1)Temperature rise reduces viscosity;

2)Repair and replace related wear parts;

3)Correction concentricity;

4)Remove the blockage.

Pump body heating

1)Screw sleeve wear;

2)Severe wear inside the pump;

3)Pumps and motors are different;

4)The outlet line is blocked.

1)Replace worn parts;

2)Correction concentricity;

3)Remove the blockage.

Mechanical seal heating

1)The mechanical seal flushing pipe is blocked;

2)The compression of mechanical seal is too large.

1)Dredge the cleaning pipe;

2)Adjust the compression of the seal.

Mechanical seal leakage

1)Mechanical seal compression is too small;

2)Mechanical seal wear, seal element damage.

1)Adjust the compression of the seal;

2)Change seal