Wilo PNV 25-125 - Acceptable Field Vibration Limit Chart; 10 Maintenance; Routine Maintenance

Installation and operating instructions WILO Mather and Platt – Sump Pumps 26
Hydraulic Institute Standard (ANSI/HI 9.6.4-2016)
Acceptable field vibration limit chart (9.6.4.2.5.1b)
10. 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 de-pressurize the
system.
10.1 Routine maintenance and frequency of inspection
Vertical sump pump requires very lit t le rout ine
maintenance; however, serious troubles can be often
avoided by regular observation and analysis of various
working parameters. Some of the routine maintenance 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.
• Vibration & sound level readings should be taken once in a
fortnight and values compared with that of previous records.
• For any abnormality observed from the visual/ manual
inspection and through maintenance and 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 Faults,
causes and remedies.
• Check dirt and dust is removed from areas around close
clearances, bearing housing and motors.
NOTE: The above Routine Maintenance checklist is for pump
only. Refer Motor / Engine manufacturers manual for the
respective routine maintenance checks.
Parts Action Period Remarks
Bearings Check temperature Weekly
If Bearing temperature
exceeds 80
0
C, the fault
needs to be rectified.
Oil / Grease
@ Bearing
Replenish
Refer 9.4.2 / Tech Data
Pg. No. 24
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. 26
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. Tech Data
Pg. 24)
Alignment
Check the alignment of
pump with motor
Half yearly
Refer 9.7, Tech. Data Pg.
No. 24
Routine maintenance