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
40-60 drops/minute
Check for Leakage
Half yearly
If required replace with new packings
Bearings
Check temperature
Weekly
If Bearing temperature exceeds 80
0
C, the fault
needs to be rectified.
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
Refer acceptable field vibration limit chart
Pg. No. 23
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 impeller
Yearly
If value of clearance is more, neck ring should
be replaced, Ref. Technical Data Pg. No. 14
Total Dynamic Head
Check Suction and Discharge
TDH
Yearly
Alignment
Check the alignment of pump
with motor
Half yearly
Refer table for alignment tolerances, Pg. No. 17
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
22
