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. |
|
| By-pass
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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