ITT GOULDS PUMPS 3410, Инструкция по установке, эксплуатации и обслуживанию

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Symptom Cause Remedy
2. Sub-cool the suction piping at the inlet to
lower the temperature of liquid that is en-
tering the pump.
3.
Pressurize the suction vessel.
The impeller or wear rings are worn or
broken. Inspect the impeller and wear rings and replace if
any of the following conditions are present:
• The impeller or wear rings are damaged.
• The vane sections are severely eroded.
• The wear ring clearance is three times nor-
mal.
The foot valve is too small or partially
obstructed. Check the valve and replace with the correct size if
necessary.
The suction inlet is not submersed
deep enough. If the inlet cannot be lowered or if the problem per-
sists after the inlet is lowered, then chain a board
to the suction pipe. The board will be drawn into
the eddies and smother the vortex.
The shaft is rotating in the wrong direc-
tion. Change the rotation. The rotation must match the
arrow on the bearing housing or pump casing.
The system static head is too high. Check with ITT to determine whether a larger im-
peller can be used. If not, then you can cut pipe
losses, increase the speed, or both. Do not over-
load the driver.
The mechanical seal is worn or broken. Repair or replace the seal as necessary.
The liquid passages are obstructed.
Make sure that the suction and discharge valves
are fully open. Disassemble the pump and inspect
the passages and casing. Remove the obstruction.
Air or gases are trapped in the liquid. Consult with ITT.
The pump starts and
then stops pumping. The suction lift is too high. Check for obstructions at the inlet and make sure
the suction valves are open. Check for pipe friction
losses. Use a vacuum or compound gauge to
check the NPSH available.
The impeller is clogged. Back-flush the pump in order to clean the impeller.
The suction piping has air leaks. Check the suction piping for air pockets and air
leaks.
The stuffing box has air leaks. Check the packing or seal and replace if necessa-
ry. Check for the proper amount of lubrication.
There is not enough suction head for
hot or volatile liquids. Consult with ITT about increasing the suction head.
The foot valve or suction pipe opening
are not submerged enough. Consult an ITT representative for the proper sub-
mersion depth. Use a baffle in order to eliminate
vortices.
Air or gases are trapped in the liquid. Consult with ITT.
The casing gasket is damaged. Check the gaskets and replace if necessary.
The bearings are run-
ning hot. The shaft is bent. Straighten the shaft or replace it if necessary.
The bearings are worn out or improper-
ly lubricated. Inspect the bearings and replace them if necessa-
ry.
There is excessive pipe strain on the
pump casing. Relieve the strain and check the alignment. Con-
sult ITT if necessary.
The pump and driver are not aligned
properly. Realign the pump and driver.
The lubrication has not been applied
properly. Check the lubricant for suitability and level.
7.1 Troubleshooting
Model 3410 Installation, Operation, and Maintenance Manual 75