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

Aug. 2, 2019

Machinery Reliability Programs

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Maintenance Guidelines, Machinery Reliability Programs

For a complete book contact:

Luis F. Rizo, PE

4 Mates Way, Waterford, New York 12188-1165

Phone: 518-371-0683; Fax: 518-371-0683

http://www.elfer.com

8.2 Recommended preventive maintenance checks for centrifugal pumps and drives

Interval

Routines

Date/Initial

Daily

Check pump for noisy bearings and cavitation.

Daily

Check bearing oil for water and discoloration.

Daily

Feel all bearings for temperature.

Daily

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

Daily

Check oil leaks at the gaskets.

Daily

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.

Daily

Determine if the mechanical seal conditions are normal.

Daily

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

Daily

Check the operability of the heat tracing.

Daily

Determine if steam leakage at packing and glands is normal.

Daily

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

Monthly

Add oil to the bearing reservoirs, if required.

Monthly

Clean oiler bulbs and level windows as required.

Monthly

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

Monthly

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

Monthly

Change oil in hydraulic governors.

Monthly

Determine if hydraulic governor heater is working.

Monthly

Check for proper oil level & leaks at hydraulic governor. Check for oil leaks at lines, fittings & power piston.

Monthly

Replace guards (repair if required).

Monthly

Determine if pump unit requires general cleaning by others.

6 Months

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.

6 Months

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

6 Months

Clean & oil governor linkage & valve stems.

6 Months

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

Yearly

Thoroughly inspect disc coupling for signs of wear & cracks in laminations. Tighten bolts.

Yearly

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.

Yearly

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. Refer to OEM manual.

Yearly

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

Yearly

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

Yearly

Inspect trip and throttle valve stems and their linkages for wear. Check over-speed mechanism for wear. (Turbine must be down).

Yearly

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

Yearly

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.

Yearly

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.

Seasonal

Fall & Summer

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

Fall

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

Fall

Inspect for damaged or missing insulation

Fall

Reestablish steam flow or electrical tracing continuity.

Illustrations 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

Copyright (C) Elfer, Inc. 1998, Waterford, New York

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