Machinery Reliability Programs
Machinery Reliability Programs
For a complete book contact:
Luis F. Rizo, PE
Mates Way, Waterford,
New York 12188-1165
Phone: 518-371-0683; Fax:
8.2 Recommended preventive maintenance checks
for centrifugal pumps and drives
pump for noisy bearings and cavitation.
bearing oil for water and discoloration.
all bearings for temperature.
bearings and oil rings through filling ports. Wipe bearing covers clean.
oil leaks at the gaskets.
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
if the mechanical seal conditions are normal.
any water cooling for effective operation. Hand test differential across coolers, jackets and
exchangers. Disassemble and
clean as required.
the operability of the heat tracing.
if steam leakage at packing and glands is normal.
for leaks at pressure casing and gaskets. Determine if steam traps are operating properly - no
continuous blow & water in casing or drain.
oil to the bearing reservoirs, if required.
oiler bulbs and level windows as required.
sure that the oil level is the correct distance from the shaft
centerline. Adjust if necessary.
out debris from bearing brackets.
Drain hole must be open.
oil in hydraulic governors.
if hydraulic governor heater is working.
for proper oil level & leaks at hydraulic governor. Check for oil leaks at lines,
fittings & power piston.
guards (repair if required).
if pump unit requires general cleaning by others.
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
a light coat of rust preventive product to expose machined surfaces to
prevent rust and corrosion.
& oil governor linkage & valve stems.
overspeed trip & valve steam linkage on turbines not running.
inspect disc coupling for signs of wear & cracks in laminations. Tighten bolts.
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.
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. Refer to OEM manual.
an indicator, check axial float of the pump & the driver shaft in similar
turbine sentinel valve. Shop test & adjust to proper setting.
trip and throttle valve stems and their linkages for wear. Check over-speed mechanism for
wear. (Turbine must be down).
Remove mechanical the governor
cover & inspect flyball seat, spring, bearing & plunger for wear.
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.
Where the process will allow it,
test run the turbine coupled to the pump. When not possible, run the turbine uncoupled. With a tachometer - verify proper governor operation & control. Determine if hand (booster) valves
are completely closed when required to carry load. This influences steam economy.
Fall & Summer
Do a seasonal oil change out, if
required by OEM lubrication guide.
Where cooling water is decommissioned,
ensure that no water remains in the jackets, coolers and piping.
Inspect for damaged or missing
Reestablish steam flow or
electrical tracing continuity.
of maintenance checks1
1. Oil level check
2. Re-greasing of bearings
3. Shaft to bearing housing face runout
4. Shaft end play measurement
1 Pictures courtesy of Goulds Pumps
(C) Elfer, Inc. 1998,
Waterford, New York
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