Troubleshooting
Model API 3171 Installation, Operation, and Maintenance Manual
53
Troubleshooting
Troubleshooting
Operation troubleshooting
Symptom
Cause
Remedy
The pump is not delivering
liquid.
The pump is not primed.
Make sure the pit is filled with liquid above the
casing. On dry pit units, the casing and suction
pipe must be completely filled.
The discharge head it too high.
Check the total head, particularly friction loss.
The motor speed is too low.
Check the motor speed.
The suction line is clogged.
Remove the obstructions.
The impeller, discharge pipe, or strainer is
clogged.
Remove obstructions or back-flush the pump.
The shaft is rotating in the wrong direction.
Change the rotation. The rotation must match the
arrow on the bearing housing or pump casing.
The suction lift is too high.
Shorten the suction pipe.
The amount of available NPSH is not suffi-
cient.
Check the amount of NPSH available and required
and adjust accordingly.
The pump is not producing
the rated flow or head.
The shaft is rotating in the wrong direction.
Change the rotation. The rotation must match the
arrow on the bearing housing or pump casing.
The discharge head is higher than expected.
Check the total head, particularly friction loss.
The impeller, discharge pipe, or strainer is
clogged.
Remove obstructions or back-flush the pump.
The motor speed is too low.
Check the motor speed.
The suction line is clogged.
Remove the obstructions.
The suction lift is too high.
Shorten the suction pipe.
The impeller is worn or broken.
Inspect and replace the impeller if necessary.
The suction line has air or vapor pockets.
Rearrange the piping in order to eliminate air
pockets.
The amount of available NPSH is not suffi-
cient.
Check the amount of NPSH available and required
and adjust accordingly.
The pump starts and then
stops pumping.
The pump is not primed.
Re-prime the pump and check that the pump and
suction line are full of liquid.
The float controls are not adjusted properly.
Check the float controls.
The strainer is clogged.
Check the sump for large items that the pump may
be picking up. Check if the bearings are running
hot.
The suction line has air or vapor pockets.
Rearrange the piping in order to eliminate air
pockets.
The suction line has an air leak.
Repair the leak.
The bearings are running
hot.
The pump and driver are not aligned properly. Realign the pump and driver.
There is not sufficient lubrication.
Check the lubricant for suitability and level.
The lubrication was not cooled properly.
Check the cooling system.
The pump is noisy or vi-
brates.
The pump and driver are not aligned properly. Realign the pump and driver.
The impeller is partly clogged.
Back-flush the pump in order to clean the impeller.
The impeller or shaft is broken or bent.
Replace the impeller or shaft as necessary.
The foundation is not rigid.
Tighten the hold-down bolts of the pump and
motor. Make sure that the base plate is properly
grouted without voids or air pockets.
The bearings are worn.
Replace the bearings.
Rotating parts are loose, broken, or rubbing
against each other.
Replace parts as necessary.
The suction or discharge piping is not an-
chored or properly supported.
Anchor the suction or discharge piping as neces-
sary according to recommendations in the Hy-
draulic Institute Standards Manual.
The pump is cavitating.
Locate and correct the system problem.
Содержание Goulds Pumps API 3171
Страница 1: ...Installation Operation and Maintenance Manual Model API 3171 ...
Страница 2: ......
Страница 63: ......