Wilo MISO 100-200, Manual

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Installation and operating instructions WILO Mather and Platt – MISO / PISO Pumps 21
Tightening torques – Untreated Screw (black finish); Coefficient of Friction 0.14
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
depressurise 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 Pg. No.
20
•
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. 27
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. 12
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. 16
NOTE:
The above Routine Maintenance checklist is for pump only. Refer Motor / Engine manufacturers manual for the respective routine
maintenance checks.
Property
Class
Torque Nominal Diameter - Course Thread
M6 M8 M10 M12 M14 M16 M20
8.8 Nm 9 22 44 76 122 190 300
Ft.lb 7 16 33 56 90 140 221