Maintenance; Routine Maintenance And Frequency Of Inspection - Wilo -SCP 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 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
maintenance; however, serious troubles can be often
avoided by regular observation and analysis of various
working parameters.
Routine maintenance
Parts
Mechanical Seal
Gland Packing
Bearings
Suction Pressure
Discharge Pressure
Flushing
Vibration
Voltage and Current Check for the rated values
Rotating element
Clearances
Total Dynamic Head
Alignment
NOTE:
The above Routine Maintenance checklist is for pump only. Refer Motor / Engine manufacturers manual for the respective routine
maintenance checks.
Installation and operating instructions WILO-Split Case Pumps
requires very little routine
Action
Check for Leakage
Check for Leakage
Check for Leakage
Check temperature
Check Pressure
Check Pressure
Check Flow
Vibration
Check the rotating for wear
Check the clearances between
neck ring and impeller
Check Suction and Discharge
TDH
Check the alignment of pump
with motor
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.
Period Remarks
Daily 5.6 gm/hr. per pair of seal face
Daily
40-60 drops/minute
Half yearly If required replace with new packings
Weekly If Bearing temperature exceeds 80
needs to be rectified.
Daily
Daily
Weekly Flow through the Flushing pipes must be
clear and continuous
Weekly Refer acceptable field vibration limit chart
Pg. No. 23
Weekly
Yearly
Yearly If value of clearance is more, neck ring should
be replaced, Ref. Technical Data Pg. No. 14
Yearly
Half yearly Refer table for alignment tolerances, Pg. No. 17
0 C, the fault
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