Pulsafeeder Isochem RGT IOM - Manual (Page 12)

7
5. Startup and Operation
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D O NOT DEAD - HEAD
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D O NOT RUN DRY
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D O NOT OPERATE AT FLOW RATES BELOW 2-3 GPM EXCEPT MOMENTARILY
Prior to operation, recheck the suction system to be sure NPSH available to the pump is adequate.
Reference Appendix G – Performance Curves for more information. Make sure all suction
piping is air tight and clean.
If the pump is equipped with a Power Frame motor mounting arrangement, consult Appendix F
for oil fill instructions.
Turn the pump over by hand. If any mechanical binding or other trouble is detected, determine
the cause and correct.
Check that electrical service to the motor agrees with the name plate ratings. Jog to check
rotation and reconnect the motor if necessary.
T HE PUMP SHOULD NEVER BE RUN DRY . D AMAGE TO IMPELLER , BEARINGS AND
WEAR PLATES WILL RESULT . P UMPS SHOULD NEVER BE OPERATED
CONTINUOUSLY AT FLOW RATES BELOW 2 GPM ( SIZE 10) OR 3 GPM ( SIZE 12).
L OCALIZED HEATING WILL REDUCE OPERATING CLEARANCES AND CAN CAUSE
DAMAGE TO THE IMPELLER , COVER , AND / OR REAR HOUSING .
The pump must be primed before operation and any air must be vented from the casing. If foot
valves are used, the valve should be of the flapper type and sized to minimize friction loss.
Threaded and plugged vents in the pump casing can be provided as an option.
Do not operate the pump against a closed discharge, as this can cause the magnetic drive to
decouple. Decoupled operation causes high temperatures that can boil the fluid or damage the
magnet assemblies. Should de-coupling occur, stop the motor and restart after the stoppage has
been cleared. As a safety precaution, a pressure relief valve bypass system is recommended.
Ideally, the pressure relief valve can be set at a low-pressure trip point for startup, ensuring that
fluid rapidly and fully floods the pump casing.
Start the pump with the discharge valve slightly open and check for proper operation. Excessive
noise or vibration is an indication of harmful cavitation caused by insufficient NPSH. Stop the
pump, and correct the issue as required.