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Pump Cavitation
Troubleshooting
Tutorial

Suction Cavitation


Suction Cavitation occurs when the Net Positive Suction Head Available to the pump is less than what is Required ------------ NPSHA < NPSHR.

Symptoms


1. The pump sounds like it is pumping rocks!

2. High Vacuum reading on suction line

3. Low discharge pressure/High flow

Causes

1. Clogged suction pipe

2. Suction line too long

3. Suction line diameter too small

4. Suction lift too high

5. Valve on Suction Line only partially open

Remedies

1. Remove debris from suction line

2. Move pump closer to source tank/sump

3. Increase suction line diameter

4. Decrease suction lift requirement

5. Install larger pump running slower which will decrease the Net Positive Suction Head Required by the pump(NPSHR)

6. Increase discharge pressure

7. Fully open Suction line valve


Discharge Cavitation


Discharge Cavitation occurs when the pump discharge head is too high where the pump runs at or near shutoff.

Symptoms

1. The pump sounds like it is pumping rocks!

2. High Discharge Gauge reading

3. Low flow

Causes

1. Clogged discharge pipe

2. Discharge line too long

3. Discharge line diameter too small

4. Discharge static head too high

5. Discharge line valve only partially open

Remedies

1. Remove debris from discharge line

2. Decrease discharge line length

3. Increase discharge line diameter

4. Decrease discharge static head requirement

5. Install larger pump which will maintain the required flow without discharge cavitating

6. Fully open discharge line valve


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