Maintenance Guidelines--Recommended preventive maintenance checks for centrifugal pumps and drives

Machinery Reliability Programs

Maintenance Guidelines,
Machinery Reliability Programs

style='mso-tab-count:3'> style='font-family:Garamond;color:black'>For a complete book contact: style='font-family:Times'>

style='font-family:Garamond;color:black'>Luis F. Rizo, PE style='mso-tab-count:4'>

style='mso-tab-count:1'> style='font-family:Garamond;color:black'> 4
Mates Way, Waterford,
New York 12188-1165

style='font-family:Garamond;color:black'>Phone: 518-371-0683; Fax:
518-371-0683

style='font-family:Garamond'>http://www.elfer.com style='font-family:Garamond;color:black'>


0in;margin-left:-22.5pt;margin-bottom:.0001pt'> font-family:Garamond;color:black'>8.2 yes"> Recommended preventive maintenance checks
for centrifugal pumps and drives
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Interval style='font-size:11.0pt;font-family:Garamond;color:black'>

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font-family:Garamond;color:black'>Routines

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style='font-size:8.0pt;font-family:Garamond;color:black'>Date/Initial

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Daily style='color:black'>

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Check
pump for noisy bearings and cavitation.

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Daily style='color:black'>

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Check
bearing oil for water and discoloration.

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Daily style='color:black'>

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Feel
all bearings for temperature.

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Daily style='color:black'>

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Inspect
bearings and oil rings through filling ports. yes"> Wipe bearing covers clean.

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Daily style='color:black'>

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Check
oil leaks at the gaskets.

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Daily style='color:black'>

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Self
flush pumps - Hand check the flush line temperature to determine flow through
the line. External flush pumps -
Determine if flow indicator and needle valve adjustment are functioning
properly.

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Daily style='color:black'>

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Determine
if the mechanical seal conditions are normal.

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Daily style='color:black'>

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Check
any water cooling for effective operation. yes"> Hand test differential across coolers, jackets and
exchangers. Disassemble and
clean as required.

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Daily style='color:black'>

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Check
the operability of the heat tracing.

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Daily style='color:black'>

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Determine
if steam leakage at packing and glands is normal.

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Daily style='color:black'>

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Check

for leaks at pressure casing and gaskets. yes"> Determine if steam traps are operating properly - no
continuous blow & water in casing or drain.

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Monthly

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Add
oil to the bearing reservoirs, if required.

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Monthly

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Clean
oiler bulbs and level windows as required.

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Monthly

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Make
sure that the oil level is the correct distance from the shaft
centerline. Adjust if necessary.

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Monthly

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Clean
out debris from bearing brackets.
Drain hole must be open.

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Monthly

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Change
oil in hydraulic governors.

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Monthly

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Determine
if hydraulic governor heater is working.

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Monthly

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Check
for proper oil level & leaks at hydraulic governor. style="mso-spacerun: yes">
Check for oil leaks at lines,
fittings & power piston.

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Monthly

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Replace
guards (repair if required).

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Monthly

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Determine
if pump unit requires general cleaning by others.

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6 Months style='color:black'>

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Machines
not running - Standby service: Overfill bearing housing to bottom of the
shaft and rotate several turns by hand to coat the shaft and the bearing with
oil.

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Apply
a light coat of rust preventive product to expose machined surfaces to
prevent rust and corrosion.

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6 Months style='color:black'>

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Clean
& oil governor linkage & valve stems.

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Exercise
overspeed trip & valve steam linkage on turbines not running.

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Yearly style='color:black'>

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Thoroughly
inspect disc coupling for signs of wear & cracks in laminations. style="mso-spacerun: yes">
Tighten bolts.

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Yearly style='color:black'>

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Using
a dial indicator, check the coupling alignment with the equipment
coupled. Use special coupling
indicator clamps where possible.
Ensure that thermal growth allowance is correct.

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Yearly style='color:black'>

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Using
an indicator clamped on the coupling, depress and lift on each coupling and
note the dial indicator change.
Determine if the deflection is normal for this machine. style="mso-spacerun: yes">
Refer to OEM manual.

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Yearly

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Using
an indicator, check axial float of the pump & the driver shaft in similar
manner.

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Yearly style='color:black'>

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Remove
turbine sentinel valve. Shop test & adjust to proper setting.

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Yearly style='color:black'>

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Inspect
trip and throttle valve stems and their linkages for wear. style="mso-spacerun: yes">
Check over-speed mechanism for
wear. (Turbine must be down).

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Yearly style='color:black'>

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Remove mechanical the governor
cover & inspect flyball seat, spring, bearing & plunger for wear.

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Yearly style='color:black'>

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Uncouple from pump &
overspeed turbine. Ensure that trip
valve will stop turbine with steam supply valve (throttle valve) fully
open. Compare tripping speed
with previous records.

Adjust trip mechanism &
repeat procedure. Follow
manufacturer?s instructions when making adjustments.

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Yearly style='color:black'>

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Where the process will allow it,
test run the turbine coupled to the pump. yes"> When not possible, run the turbine uncoupled. style="mso-spacerun: yes">
With a tachometer style='font-family:Symbol;color:black;mso-char-type:symbol;mso-symbol-font-family:
Symbol'>- style='color:black'> verify proper governor operation & control. style="mso-spacerun: yes"> Determine if hand (booster) valves
are completely closed when required to carry load. yes"> This influences steam economy.

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Seasonal

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Fall & Summer style='color:black'>

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Do a seasonal oil change out, if
required by OEM lubrication guide.

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Fall

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Where cooling water is decommissioned,
ensure that no water remains in the jackets, coolers and piping.

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Fall

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Inspect for damaged or missing
insulation

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Fall style='color:black'>

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Reestablish steam flow or
electrical tracing continuity.

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Illustrations
of maintenance checks1

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style='font-size:11.0pt;color:black'>1. Oil level check style='color:black'>

style='font-size:11.0pt;color:black'>2. Re-greasing of bearings

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avoid'>

style='font-size:11.0pt'>3. Shaft to bearing housing face runout style='color:black'>

avoid'>

style='font-size:11.0pt'>4. Shaft end play measurement black'>

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1 style='color:black'> Pictures courtesy of Goulds Pumps

Copyright
mso-symbol-font-family:Symbol'> Symbol'>(C) Elfer, Inc. 1998,
Waterford, New York

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