Installation and operating instructions Wilo
–
SCPV pumps
20
8.3.3 Normal starting and running checks
When all the foregoing pre-start checks are
satisfactory, depress the appropriate
`START' button on the control panel and run
the pump at its rated speed.
Check that the pump is rotating in the
correct direction. This is indicated by a
direction arrow on the pump casing.
Check the ammeter reading to ensure that
the motor is not being overloaded.
Check that the pumping unit is generating
not less than its rated delivery pressure
indicated in the data sheet/name plate.
CA UTION! If the pumping unit fails to generate
at least its rated delivery pressure it must be
stopped immediately, the cause ascertained, the
fault rectified and the pumping unit re-primed
before restarting.
Ensure that the stuffing box is not
overheating and that there is slight leakage
from the gland.
Check that the bearing is not overheating.
If the foregoing checks are satisfactory,
open the delivery valve slowly and bring the
pump gradually up to its rated parameters
based on pressure gauge and ammeter
readings
Check that the driving unit is not being
overloaded during valve opening.
Check vibration of pump set and ensure
that vibration level is within limits specified
in Hydraulic Institute Standard of America.
Check that noise level is within stipulated
limits
8.3.4 Sealing system
Gland packing
CA UTION! Risk of damaging the pump!
If the gland plate is too tight, the packing
stuff will be immediately damage.
At the beginning of the operation, the leak at
the gland packing should be important. It
should reduce progressively after several
hours by a balanced and reasonable
tightening the gland plate. The gland packing
must operate without excessive temperature.
The correct setting of the gland packing let a
permanent leak around 1 or 2 drops per
seconds.
If this leak is too much and cannot be adjusted
with the gland plate, the packing stuff is worn
and must be replaced.
Mechanical seal
CAUTION! Risk of damaging the pump!
A mechanical seal must never operate
without fluid and lubrication even for a
short period of time.
Insure that the pump is completely full of water
and vented before starting the pump. Small
leakages can occur during the period of
running-in, they should disappear after several
hours of operation. If the leakages don
’
t stop,
shut down the pump disassemble the mechanical
seal and control their condition.
8.3.5 Normal shutdown
WARNING! Risk of Burns!
If the fluid temperature and system pressure is high,
close the isolation valves upstream and downstream
of the pump. Initially let the pump cool.
Close the delivery valve to reduce the load on the
driving unit.
Stop the driver of the pump.
When the pump has come to rest, close the
suction-isolating valve.
Isolate any ancillary supplies.
8.3.6 Emergency Shutdown
In the event of any malfunction of the equipment,
switch off the pump set. When the pump has come to
rest, close the suction & discharge valves, isolate the
driving unit power supply & rectify the fault.
