GRISWOLD PUMP COMPANY Pump Operation Page 18
Installation, Operation and Maintenance Manual
Griswold Model 811
Griswold Pump Company Pump Operation Page 20
DO NOT operate the pump below minimum rated flows or with suction and/or discharge
valve closed. These conditions may create an explosive hazard due to vaporization of
pumpage and can quickly lead to pump failure and physical injury.
Systems on Suction Lift with Foot Valve
See illustration at left. Note vent location above
pump discharge nozzle.
For initial start-up when discharge system is
empty, it may be necessary to provide prime with
an external, or outside, water source. Once the
discharge system is full, re-priming may be done
with a bypass as shown.
With vent open, furnish water into the pump and
suction piping with either a bypass line from the
discharge system or from an outside source.
Once liquid escapes from the vent, the pump and
suction pipe should be full of liquid (primed).
Systems on Suction Lift without Foot Valve
This will require a source of vacuum (vacuum pump or eductor) to lift water/liquid up through
the suction piping AND the pump. Vacuum connection must be located above the pump
discharge to completely prime. Once liquid is pulled through the vacuum connection, prime is
achieved.
Starting the Pump
1. Re-check motor to ensure that connections are correct. Check that thermal overload
relays are properly sized and set for operation.
2. Ensure that the coupling guard and all other safety-related devices and instrumentation
are in place and in working order.
3. Be sure that the suction isolation valve is completely open. Never use the suction valve
to control flow. This can/will lead to “starving” the pump, causing cavitation and
vibration and will result in damage to the pump.
4. If pump handles pumpage at temperature greater than 200
0
F, the pump should be
gradually warmed until its temperature is within 100
0
F of intended operating temperature.
Heating rate should not exceed 2.5
0
F per minute.
5. Ensure that all flushing and cooling lines, as applicable, are attached and operational.
6. Discharge valve should be “cracked” open.
WARNING
FIGURE 11
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