Troubleshooting; Operation Troubleshooting - Goulds Pumps 3700 Installation, Operation And Maintenance Manual

Troubleshooting

Operation troubleshooting

Symptom
The pump is not delivering
liquid.
The pump is not producing
the rated flow or head.
The pump starts and then
stops pumping.
The bearings are running
hot.
The pump is noisy or vi-
brates.
The stuffing box is leaking
excessively.
The motor requires exces-
sive power.
Model 3700, API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Installation, Operation, and Maintenance 101
Manual
Cause
The pump is not primed.
The suction line is clogged.
The impeller is clogged.
The shaft is rotating in the wrong direction.
The foot valve or suction pipe opening is not
submerged enough.
The suction lift is too high.
The gasket or O-ring has an air leak.
The stuffing box has an air leak.
The impeller is partly clogged.
The clearance between the impeller and the
pump casing is excessive.
The suction head is not sufficient.
The impeller is worn or broken.
The pump is not primed.
The suction line has air or vapor pockets.
The suction line has an air leak.
The pump and driver are not aligned properly. Realign the pump and driver.
There is not sufficient lubrication.
The lubrication was not cooled properly.
The pump and driver are not aligned properly. Realign the pump and driver.
The impeller is partly clogged.
The impeller or shaft is broken or bent.
The foundation is not rigid.
The bearings are worn.
The suction or discharge piping is not an-
chored or properly supported.
The pump is cavitating.
The packing gland is not adjusted properly.
The stuffing box is not packed properly.
The mechanical seal parts are worn.
The mechanical seal is overheating.
The shaft sleeve is scored.
The discharge head has dropped below the
rated point and is pumping too much liquid.
The liquid is heavier than expected.
The stuffing-box packing is too tight.
Rotating parts are rubbing against each other. Check the parts that are wearing for proper
The impeller clearance is too tight.
Remedy
Re-prime the pump and check that the pump and
suction line are full of liquid.
Remove the obstructions.
Back-flush the pump in order to clean the impeller.
Change the rotation. The rotation must match the
arrow on the bearing housing or pump casing.
Consult an ITT representative for the proper sub-
mersion depth. Use a baffle in order to eliminate
vortices.
Shorten the suction pipe.
Replace the gasket or O-ring.
Replace or readjust the mechanical seal.
Back-flush the pump in order to clean the impeller.
Adjust the impeller clearance.
Make sure that the suction-line shutoff valve is
fully open and that the line is unobstructed.
Inspect and replace the impeller if necessary.
Re-prime the pump and check that the pump and
suction line are full of liquid.
Rearrange the piping in order to eliminate air
pockets.
Repair the leak.
Check the lubricant for suitability and level.
Check the cooling system.
Back-flush the pump in order to clean the impeller.
Replace the impeller or shaft as necessary.
Tighten the hold-down bolts of the pump and
motor. Make sure the baseplate is properly
grouted without voids or air pockets.
Replace the bearings.
Anchor the suction or discharge piping as neces-
sary according to recommendations in the Hy-
draulic Institute Standards Manual.
Locate and correct the system problem.
Tighten the gland nuts.
Check the packing and repack the box.
Replace the worn parts.
Check the lubrication and cooling lines.
Machine or replace the shaft sleeve as necessary.
Install a throttle valve. If this does not help, then
trim the impeller diameter. If this does not help,
then contact your ITT representative.
Check the specific gravity and viscosity.
Readjust the packing. If the packing is worn, then
replace the packing.
clearances.
Adjust the impeller clearance.
Troubleshooting