Operation | Priming | Starting | Shutdown
7
OPERATION
PRE-START CHECKS
Before initial start of the pump, make the
following inspections:
1. Check alignment between pump and motor.
2. In the desired direction, check rotation each
time motor leads have been disconnected.
3. Check all connections to motor and starting
device with wiring diagram. Check voltage,
phase, and frequency on motor nameplate with
line circuit.
4. Check suction and discharge piping and
pressure gauges for proper operation.
5. Turn rotating element by hand to assure that it
rotates freely.
6. Check impeller clearance.
7. Assure that pump bearings are properly
lubricated.
8. Assure that pump is full of liquid.
PRIMING
If the pump is installed with a positive head on the
suction, it can be primed by opening the suction
and vent valve and allowing the liquid to enter the
casing.
If the pump is installed with a suction lift, priming
must be done by other methods such as foot
valves, ejectors, or by manually filling the casing
and suction line.
NOTE: Under either condition, the pump must be
completely filled with liquid before starting. The
pump must not be run dry in the hope it will prime
itself.
STARTING
1. Close drain valves.
2. Fully open all valves in the suction and
discharge lines.
3. If pumped fluid is dirty, these lines should
always be left open except when using double
mechanical seals.)
4. Prime the pump.
NOTE: If the pump does not prime properly, or
loses prime during start-up, it should be shut down
and the condition corrected before the procedure
is repeated.
5. (Pumps moving high temperature liquids).
Open the warm-up valve to circulate liquid for
preheating. Close the valve after the pump is
warmed up.
6. Start the pump driver (turbines and engines
may require warming up; consult the
manufacturer's instructions).
7. When the pump is operating at full speed,
check to see that the check valve has opened
up. Check valve must open 5 seconds or less
after start-up to prevent damage to pump by
operating at zero flow.
8. Adjust the seal water valves to produce the
recommended pressure for either the
mechanical seal or packed stuffing box.
Note: The valve in the discharge line should always
be closed when the pump is started. The excessive
current required by the motor to start under full
load will in time cause motor trouble.
SHUTDOWN
The following steps will take care of most normal
shutdowns of the pump. Make any further adjust-
ments of process piping, valves, etc., as required.
If the pump is to be removed from service for an
extended period of time, refer to "Storage", and
"Freeze Protection".
1. Close the discharge valve slowly.
Note: When stopping pump, always close discharge
valve first.
2. Shut down the driver (consult manufacturer’s
instructions for special operations).
3. Close seal water valves. (If pumped liquid is
dirty, or if in leakage is to be prevented, these
lines should always be left open, except when
the pump is completely drained.)
4. Open drain valves as required.
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