Installation and operating instructions Wilo
–
SCPV pumps
21
9 Maintenance
Maintenance and repair work should be
carried out by qualified personnel only.
WARNING! Danger of electric shock!
Any danger from electrical current should
be ruled out.
•
The pump should be electrically isolated
and secured against unauthorized switch-
on prior to any maintenance or repair work.
•
Any damage to the connection cable
should always be rectified by a qualified
electrician only.
WARNING! Risk of scalding!
At high fluid temperatures and system
pressures, allow the pump to cool down
first and then depressurize the system.
9.1 Routine maintenance and frequency of
inspection
Centrifugal pump requires very little routine
maintenance; however, serious troubles can
be often avoided by regular observation and
analysis of various working parameters. Some
of the routine maintenance checks for this
purpose are as under:
To keep daily logbook records of working
parameters like suction and discharge pressure,
flow rate, current drawn, bearing temperature,
etc. These parameters should be recorded twice
a shift. Any sudden change should be a signal for
investigation. Refer Section Maintenance &
Inspection log.
Check bearings for normal temperature. See
8.3.3
Vibration & sound level readings should be taken
once in a fortnight and values compared with
that of previous records.
Check that there is sufficient leakage from the
gland packing to ensure proper cooling and
lubrication. (If applicable) For mechanical seal,
check that there is no visible leakage.
For any abnormality observed from the visual/
manual inspection and through maintenance &
inspection logs, stop the pump and investigate.
Fault finding - Many of the common faults
which occur on centrifugal pumps and which can
be diagnosed by observations are given in the
chart under section 10 Faults, causes and
remedies.
Routine maintenance
Parts
Action
Period
Remarks
Mechanical Seal
Check for Leakage
Daily
5.6 gm/hr per pair of seal face
Gland Packing
Check for Leakage
Daily
10 to 120 drops/min
Check for Leakage
Half yearly
If required replace with new pickings
Bearings
Check temperature
Weekly
Bearings are greased for life and are
maintenance free
Suction Pressure
Check Pressure
Daily
Discharge Pressure
Check Pressure
Daily
Flushing
Check Flow
Weekly
Flow through the Flushing pipes must be
clear and continuous
Vibration
Vibration
Weekly
Voltage and Current
Check for the rated values
Weekly
Rotating element
Check the rotating for wear
Yearly
Clearances
Check the clearances
between neck ring and
Yearly
If value of clearance is more, neck ring
should be replaced
Total Dynamic Head
Check Suction and Discharge
TDH
Yearly
Alignment
Check the alignment of pump
with motor
Half yearly
For reference use pump motor GA Drawing
