Low
Capacity |
| Possible
Causes | |
What To Do
| |
|
Pump speed too slow | |
Use tachometer to determine pump speed. Adjust speed. |
|
|
Low voltage | |
Check motor speed. |
|
|
Differential pressure too high | |
Restriction in discharge piping or discharge piping is too small. |
|
|
Bypass valve stuck open or set too low | |
Check capacity with by-pass line closed using manual valve. Re-adjust, repair
or replace valve. |
|
|
Clogged strainer | |
Clean strainer. |
|
|
Suction pipe too small or restricted | |
Indicated by pump inlet pressure dropping several pounds when pump is started.
Remove restriction or modify piping. |
|
|
Worn blades/vanes | |
Replace blades/vanes. |
|
|
Worn sideplates | |
Replace/Reverse sideplates. |
|
|
Blade/Vane sticking | |
Remove blades/vanes and clean out foreign matter. Check material compatibility
or replace blades if swollen. |
|
|
Broken blade/vane drivers | |
Replace. |
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