Maintenance; Routine Maintenance And Frequency Of Inspection - Wilo SCPV Installation And Operating Instructions Manual

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
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
Routine maintenance
Parts
Mechanical Seal
Gland Packing
Bearings
Suction Pressure
Discharge Pressure
Flushing
Vibration
Voltage and Current
Rotating element
Clearances
Total Dynamic Head
Alignment
Installation and operating instructions Wilo – SCPV pumps
and system
Action
Check for Leakage
Check for Leakage
Check for Leakage
Check temperature
Check Pressure
Check Pressure
Check Flow
Vibration
Check for the rated values
Check the rotating for wear
Check the clearances
between neck ring and
Check Suction and Discharge
TDH
Check the alignment of pump
with motor
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
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.
Period Remarks
Daily
5.6 gm/hr per pair of seal face
Daily 10 to 120 drops/min
Half yearly If required replace with new pickings
Weekly Bearings are greased for life and are
maintenance free
Daily
Daily
Weekly Flow through the Flushing pipes must be
clear and continuous
Weekly
Weekly
Yearly
Yearly If value of clearance is more, neck ring
should be replaced
Yearly
Half yearly For reference use pump motor GA Drawing
&
proper cooling and
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