What is included in a centrifugal pump annual service?

A centrifugal pump annual service includes all quarterly service items plus 10 additional actions: opening the pump casing to inspect the impeller for erosion, corrosion and damage; measuring wear ring clearance and comparing to manufacturer limits; inspecting or replacing the mechanical seal (faces, springs, O-rings); checking shaft runout with a dial indicator at the coupling end; servicing the coupling (replacing elastomer or grid, checking alignment); motor service (insulation resistance test, bearing replacement if due); full vibration spectrum analysis compared to baseline; performance test (measuring flow vs head vs amps against the design curve); inspecting the volute/casing for erosion or corrosion; and repainting or applying corrosion protection. The pump must be isolated and drained before starting. It takes approximately 4 to 8 hours.

What is carry-forward servicing for centrifugal pumps?

Carry-forward (or cumulative) servicing means that each higher-level service includes all tasks from the level below. The annual service includes all quarterly service items: bearing temperature and vibration measurement, seal inspection, pressure and amp recording, coupling alignment, bearing lubrication and data logging. The annual service adds invasive tasks that require the pump to be isolated and drained, such as opening the casing, measuring wear rings, replacing seals, checking shaft runout and performance testing.

When should wear rings be replaced on a centrifugal pump?

Wear rings should be replaced when the clearance exceeds the manufacturer specified limit, which is typically double the original design clearance. For example, if the design clearance is 0.25 mm, replacement is usually recommended when clearance reaches 0.50 mm or more. Excessive wear ring clearance reduces pump efficiency (internal recirculation increases), reduces head and flow capacity, and increases power consumption. Always measure and record wear ring clearance during the annual service and compare to the manufacturer limit for your specific pump.

Is the template free to use without MapTrack?

Yes. Download and use the centrifugal pump annual service procedure for free. Open the file and use your browser's Print, then Save as PDF. No MapTrack account required. If you later want digital service procedures linked to each pump with scheduling, alerts, trend tracking and parts cost recording, we would be happy to show you MapTrack.

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Free centrifugal pump annual service checklist

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A comprehensive annual service procedure for centrifugal pumps (water, process and slurry). Includes all quarterly service items plus impeller inspection, wear ring measurement, mechanical seal replacement, shaft runout check, coupling service, motor insulation resistance test, full vibration spectrum analysis, performance testing against the design curve and corrosion protection. The pump must be isolated and drained. Includes fluid specifications, parts list and technician sign-off. This page explains what the service involves, how to perform it, and offers a free PDF-ready form you can download straight away.

Last updated: 2026-03-26 · MapTrack

Jarrod Milford

Commercial Director

Updated 26 March 2026

How to use: Complete the quarterly service first, then isolate and drain the pump. Fill equipment details and work through each additional annual service action. Record measurements (wear ring clearance, shaft runout, performance data) in the notes column. Tick Done as each task is completed. Set the next service date and sign off.

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What is a centrifugal pump annual service?

An annual service is the most comprehensive scheduled maintenance event for a centrifugal pump. It is performed every 12 months and requires the pump to be isolated and drained. The annual service includes all quarterly service items (bearing checks, vibration, seal inspection, pressures, amps, alignment, lubrication) plus invasive tasks that require disassembly. These additional tasks include opening the pump casing to inspect the impeller for erosion, corrosion and damage; measuring wear ring clearance; inspecting or replacing the mechanical seal; checking shaft runout; servicing the coupling; motor insulation resistance testing; bearing replacement if due; full vibration spectrum analysis; performance testing (flow vs head vs amps compared to the design curve); inspecting the volute/casing for erosion or corrosion; and applying corrosion protection. This is a carry-forward service: it includes every task from the quarterly service, so both are completed in a single visit.

Benefits of annual pump servicing

Restored efficiency: measuring wear ring clearance and replacing worn rings restores pump efficiency, reducing energy consumption and improving flow capacity.
Prevented seal failures: replacing the mechanical seal before it fails catastrophically avoids unplanned shutdowns, product contamination and environmental incidents.
Baseline performance data: annual performance testing (flow vs head vs amps) provides a documented comparison to the design curve, making it easy to track degradation over time.
Motor protection: insulation resistance testing identifies winding degradation before it causes motor burnout, which is typically the most expensive pump repair.
Extended pump life: shaft runout checks, coupling service and corrosion protection extend the overall service life of the pump assembly.
Planned downtime: scheduling the annual service during a planned shutdown minimises production impact compared to an unplanned failure.

Benefits of digitising forms in MapTrack

When you move from paper or static PDFs to digital forms in MapTrack, you get:

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Service actions included in the annual procedure

This annual service includes all 12 quarterly service actions plus 10 additional actions:

Impeller and casing: open pump casing, inspect impeller for erosion, corrosion and damage; measure wear ring clearance (compare to manufacturer limits); inspect volute/casing for erosion or corrosion.
Mechanical seal: inspect or replace mechanical seal (check faces, springs, O-rings).
Shaft: check shaft runout with dial indicator at coupling end.
Coupling: service coupling (replace elastomer or grid, check alignment).
Motor: insulation resistance test, bearing replacement if due.
Performance testing: full vibration spectrum analysis (compare to baseline); performance test measuring flow vs head vs amps (compare to design curve).
Corrosion protection: repaint or apply corrosion protection.

Fluid specifications

General fluid specifications for centrifugal pumps. Always refer to the manufacturer's service manual for your specific pump.

System	Type / Grade	Approx. Capacity
Bearing grease	EP2 lithium complex	Per manufacturer spec
Mechanical seal flush	Clean water (if applicable)	As required

Specifications are general guidelines. Always refer to the manufacturer's service manual for your specific pump make and model.

Parts and consumables

Have the following parts and consumables ready before starting the annual service (in addition to quarterly consumables):

Mechanical seal kit - 1
Wear rings (if worn beyond limit) - set
Coupling elastomer / grid - 1
Motor bearings (if due) - set
Gasket set (casing) - 1
EP2 bearing grease - per manufacturer specification
Corrosion protection paint - as required
Rags and cleaning materials

Look up part numbers in the manufacturer's parts manual for your specific pump make and model before ordering.

How to perform a centrifugal pump annual service

Complete the full quarterly service procedure first. All quarterly items carry forward into the annual service.
Isolate the pump electrically and mechanically. Close suction and discharge valves. Drain the pump casing and piping. Confirm lockout/tagout is in place.
Disconnect the coupling. Check shaft runout with a dial indicator at the coupling end. Record the reading.
Open the pump casing. Inspect the impeller for erosion, corrosion and damage. Measure wear ring clearance at multiple points and compare to the manufacturer's limits.
Inspect the volute/casing for erosion or corrosion, particularly at the cutwater and tongue areas.
Inspect the mechanical seal. Replace the seal kit if wear on faces, springs or O-rings is found. Follow the manufacturer's seal installation procedure.
Service the coupling: replace the elastomer or grid element. Reassemble and perform laser alignment to manufacturer tolerances.
Motor service: perform insulation resistance test on all windings. Replace motor bearings if due per the manufacturer's schedule or if vibration data warrants it.
Reassemble the pump. Refill with process fluid. Start the pump and perform a full vibration spectrum analysis. Compare to baseline data.
Perform a performance test: measure flow, head and amps at multiple operating points. Compare to the manufacturer's design curve. Record all data.
Apply corrosion protection paint to exposed surfaces. Record any defects or recommendations in the notes section. Set the next service date and sign off.

In MapTrack, you can schedule pump services by calendar date or operating hours, get automatic reminders, complete service procedures on mobile, track parts costs and link every record to the pump. Book a demo to see how.

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Centrifugal pump service interval hierarchy

Centrifugal pump maintenance follows a tiered schedule where each level includes all tasks from the level below. This is called carry-forward or cumulative servicing.

Daily/Weekly - Operator check

Visual check for leaks, abnormal noise, basic pressure readings and general condition.

Quarterly - Service

Bearing temperature and vibration, seal inspection, pressures, amps, alignment, lubrication, data logging. Estimated 1-2 hours.

Annual - Major service (you are here)

All quarterly tasks plus impeller inspection, wear ring measurement, mechanical seal replacement, shaft runout, coupling service, motor insulation test, vibration spectrum analysis, performance test and corrosion protection. Estimated 4-8 hours.

In MapTrack, you can configure service schedules by calendar date or operating hours and receive automatic alerts when each interval is due.

Frequently asked questions

What is included in a centrifugal pump annual service?: A centrifugal pump annual service includes all quarterly service items plus 10 additional actions: opening the pump casing to inspect the impeller for erosion, corrosion and damage; measuring wear ring clearance and comparing to manufacturer limits; inspecting or replacing the mechanical seal (faces, springs, O-rings); checking shaft runout with a dial indicator at the coupling end; servicing the coupling (replacing elastomer or grid, checking alignment); motor service (insulation resistance test, bearing replacement if due); full vibration spectrum analysis compared to baseline; performance test (measuring flow vs head vs amps against the design curve); inspecting the volute/casing for erosion or corrosion; and repainting or applying corrosion protection. The pump must be isolated and drained before starting. It takes approximately 4 to 8 hours.
What is carry-forward servicing for centrifugal pumps?: Carry-forward (or cumulative) servicing means that each higher-level service includes all tasks from the level below. The annual service includes all quarterly service items: bearing temperature and vibration measurement, seal inspection, pressure and amp recording, coupling alignment, bearing lubrication and data logging. The annual service adds invasive tasks that require the pump to be isolated and drained, such as opening the casing, measuring wear rings, replacing seals, checking shaft runout and performance testing.
When should wear rings be replaced on a centrifugal pump?: Wear rings should be replaced when the clearance exceeds the manufacturer specified limit, which is typically double the original design clearance. For example, if the design clearance is 0.25 mm, replacement is usually recommended when clearance reaches 0.50 mm or more. Excessive wear ring clearance reduces pump efficiency (internal recirculation increases), reduces head and flow capacity, and increases power consumption. Always measure and record wear ring clearance during the annual service and compare to the manufacturer limit for your specific pump.
Is the template free to use without MapTrack?: Yes. Download and use the centrifugal pump annual service procedure for free. Open the file and use your browser's Print, then Save as PDF. No MapTrack account required. If you later want digital service procedures linked to each pump with scheduling, alerts, trend tracking and parts cost recording, we would be happy to show you MapTrack.

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Register every centrifugal pump in MapTrack. Set up quarterly and annual service schedules, record wear ring measurements and performance data on mobile, track trends over time, and get automatic alerts when the next service is due.

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