Goulds Pumps VIT - IOM - Manual (Page 67)

Troubleshooting
Operation troubleshooting
Symptom Cause Remedy
Pump does not start. The electrical circuit is open or not complete. Check the circuit and make any necessary
corrections.
The impellers are binding against the bowls. Reset the impeller adjustment. See Installation
for details.
The electric driver is not receiving enough
voltage.
Make sure that the driver is wired correctly and
receiving full voltage.
The motor is defective. Consult an ITT representative.
The pump is not delivering liquid. The bowl assembly is not submerged enough. Adjust the liquid level in the sump as necessary.
The suction strainer is clogged.
Remove the obstructions.
There is an obstruction in the liquid passage. Pull the pump and inspect the impeller and bowl.
The discharge head is not properly vented. Open the vent.
The pump is not producing the
rated flow or head.
The impellers are not rotating fast enough. Make sure that the driver is wired correctly and
receiving full voltage.
The impellers are rotating the wrong
direction.
Make sure the impellers are spinning
counterclockwise when viewed from above.
Check the engagement of the motor coupling.
The total pump head is too high. Check the pipe friction losses. Use larger
discharge piping.
The liquid passages are partially obstructed. Inspect the impellers and bowls and remove
any obstructions.
There is cavitation. Insufficient NPSH is available.
The impellers are too high (semi-open
construction only).
Reset the impeller adjustment. See Installation
for details.
There is not enough pressure. The impellers are not rotating fast enough. Make sure that the turbine is receiving full
steam pressure.
The liquid passage is obstructed. Inspect the impellers and bowls and remove
any obstructions.
The impellers are rotating the wrong
direction.
Make sure the impellers are spinning
counterclockwise when viewed from above.
Check the engagement of the motor coupling.
The impellers are too high (semi-open
construction only).
Reset the impeller adjustment. See Installation
for details.
The pump starts and then stops
pumping.
Excessive power is required. Use a larger driver. Consult an ITT
representative.
The pump is pumping a higher viscosity or
different specific gravity liquid than it was
designed to handle.
Test the liquid for viscosity and specific
gravity. Consult an ITT representative.
Critical parts have experienced mechanical
failure.
Check the bearings, wear rings, and impellers
for damage. Any irregularities in these parts
will cause a drag on the shaft. Replace any
damaged parts as necessary.
The impellers are rotating too fast. Check the frequency on the motor.
The pump and driver are misaligned. Realign the pump and driver.
The discharge head is not properly vented. Open the vent.
Troubleshooting
Model VIT Installation, Operation, and Maintenance 65