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START UP PROCEDURES
NOTICE:
Consult the "General Pump Troubleshooting" section of
this manual if difficulties during start up are experienced.
1. Start the motor. Priming should occur within one minute.
2. Check the suction and discharge pressure to see if the
pump is operating within the expected conditions.
Record pressures in the ‘Initial Start Up Information’
section.
3. Check for leakage from the piping and equipment.
4. Check for overheating, excessive noise or vibration of the
pump, reducer, and motor.
5. Check the flow rate to ensure the pump is operating
within the expected parameters. Record flow rate in the
‘Initial Start Up Information’ section.
6. Check the pressure setting of the relief valve by briefly
closing a valve in the discharge line and reading the
pressure gauge. This pressure should be 20 psi (1.4 bar)
higher than the maximum operating pressure.
Do not run the pump for more than 10-15 seconds
with the discharge valve completely closed.
If adjustments need to be made, refer to "Relief Valve
Setting & Adjustment."
Incorrect settings of the pressure relief
valve can cause pump component
failure, personal injury, and property
damage.
Hazardous pressure
can cause personal
injury or property
damage
RUNNING THE PUMP IN REVERSE
ROTATION
NOTICE:
Pump should be operated in reverse rotation for no more
than 10 minutes and only when a separate pressure relief
valve is installed to protect the pump from excessive
pressure.
It may be desirable to run the pump in reverse rotation for
system maintenance. The pump will operate satisfactorily in
reverse rotation for a LIMITED time,
at a reduced
performance level.
FLUSHING THE PUMP
NOTICE:
If flushing fluid is to be left in the pump for an extended
time, it must be a lubricating, non-corrosive fluid. If a
corrosive or non-lubricating fluid is used, it must be
flushed from the pump immediately.
1. To flush the pump, run the pump with the discharge
valve open and the intake valve closed. Bleed air into
the pump through the intake gauge plug hole or through
a larger auxiliary fitting in the intake piping. Pump air
for 30 second intervals to clean out most of the
pumpage.
2. Run a system compatible flushing fluid through the
pump for one minute to clear out the remainder of the
original pumpage. The valve in the discharge line
should be restricted to build up 10 psi (0.7 bar) to force
flushing liquid through the bearing seal chamber.
3. To remove the flushing fluid, follow step 1 above.
NOTICE:
After flushing the pump some residual fluid will remain
in the pump and piping.
NOTICE:
Properly dispose of all waste fluids in accordance with
the appropriate codes and regulations.
PUMP RELIEF VALVE
NOTICE:
The pump internal relief valve is designed to protect the
pump from excessive pressure and must not be used as
a system pressure control valve.
XLW series pumps are fitted with an internal pressure relief
valve that bypasses back to the suction side of the pump.
Pumping volatile liquids under suction lift may cause
cavitation. Partial closing of the discharge valve WILL result
in internal relief valve chatter and is NOT recommended. For
these applications, install an external system pressure
control valve, and any necessary bypass piping, back to the
storage tank.
A system pressure control valve is also recommended when
operating for extended periods (more than 15 seconds)
against a closed discharge valve.