Supersedes 3200-326
Sep., 2015 Mar., 2016
Cornell Pump Company
5. Instructions For Pumps with Balance Line and Wear Rings
Wear rings and balance lines are vital for a successful pump operation. They perform two important
functions. First, they reduce the pressure at the stuffing box. Second, they reduce axial thrust loads.
Wear rings should be replaced if the clearance has increased to about .03" per side. Balance lines should
be kept free of obstructions and they should be replaced if they are pinched, bent, or corroded.
6. Motors
Check the power supply voltage, amperage, temperature and RPM with the motor nameplate. Review
item 2F with respect to rotation.
NOTE: Large motors must not be started and stopped more than five times per hour.
CAUTION
Whether placed inside our outside, the motor should be mounted on a base four to six inches
higher than surrounding floor level.
7. Cornell Bearing Frames
In general, the considerations for a bearing frame are the same for that of electric motors.
NOTE: If a frame is oil lubed (denoted by âKâ on serial number plate and sight gauge on the side of the
frame), put appropriate oil in per lubrication instructions. Make sure support systems are in place and
working such as special lubricants, seal water, etc.
If the pump is used in winter, provisions must be made for protection of the pump and piping from
freezing. Add a heater if necessary. If the pump is not used in the winter, the volute should be drained to
prevent damage.
WARNING
Never operate electric motors or pump equipment without all protective covers, screens and
guards properly in place. Before disconnecting any electrical wiring, shut off the main
switch and lock it out.
8. Check to make sure the screens are in place. A screen or strainer should have a free opening at least
three times the area of the suction pipe.
9. Bump start the driver and check for proper rotation. Improper rotation can be harmful to persons and
equipment.
10. Start the driver. If pump is primed or filled with liquid, the pumping will start immediately.
Cornell Centrifugal Pump Priming
A centrifugal pump is primed when all the internal passages of the pump are filled with the liquid to be
pumped. Do not operate any pump without being properly primed unless it has been specifically
designed for such operation.
When the pump is primed and the unit is started, the pumpage will start to flow immediately. If it does
not, recheck the system for complete prime and possible air leaks. Correct the deficiencies and restart.
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