This checklist covers fire suppression and sprinkler pump preventive maintenance tasks. There is no separate critical version — this pump is always critical.
⚠️ Disclaimer: These tasks are guidelines only. They do not include lockout/tagout (LOTO), energy isolation, or other safety requirements. Review and verify suitability for your specific equipment and application. Add all required safety procedures per your company's policies and regulatory requirements before use. You are responsible for the safe and appropriate execution of all maintenance activities.
Most pumps fail slowly. The signs accumulate — a vibration you've been meaning to look at, a seal that's been weeping for a month, a noise that wasn't there last quarter. You catch it on your rounds, put in a work order, schedule the repair.
Fire suppression pumps don't work that way. They sit idle for weeks or months at a time, and when they run, it's because something is burning. There's no time to discover the controller has a fault. No time to find out the diesel hasn't been started since the last PM. No time to explain that the coupling insert disintegrated sometime in the last quarter and nobody noticed.
This checklist covers the PM tasks that keep a fire suppression pump ready to perform the one thing it exists to do: start immediately and hold pressure when someone's building is on fire. It's written for both field technicians executing the PM and maintenance managers building or auditing the program.
For broader pump PM program fundamentals, see the full pump PM framework.
How to Use This Checklist
Record every finding with specificity. "Packing OK" is not a finding. "Packing dripping approximately 3 drops/min at operating pressure — within spec" is a finding. "Battery bank terminal showing white corrosion buildup on negative post, cleaned and retightened" is a finding. The difference matters when you're looking back at six months of PMs trying to understand a trend.
These tasks carry frequencies because the NFPA and most AHJs treat fire pump testing schedules as requirements, not suggestions. Weekly churn tests are weekly. Annual flow tests are annual. Do not skip or defer these without understanding the regulatory and insurance implications first.
A finding like "controller shows no faults" is fine. A finding like "controller showed Fault Code 14 — low voltage on Phase B — alarm was acknowledged and cleared, investigation pending" is what keeps people safe. If you acknowledge and clear an alarm without documenting it and following up, you've done the opposite of a PM.
Field Checklist — Critical Tasks
Visual Inspection
| Task | Freq | Type |
|---|---|---|
| Inspect pump casing, discharge piping, and all fittings for visible leaks; note any seepage at flanges, gaskets, or mechanical seal. | Every PM | MEC |
| Check packing gland or mechanical seal — confirm no excessive leakage; packing should allow slight drip (~1 drop/min), mechanical seal should be dry. | Every PM | MEC |
| Verify pump suction and discharge valves are in the correct open/closed position per system design; tag and report any discrepancy immediately. | Every PM | MEC |
| Inspect pump bearing housings for heat or abnormal noise during operation; investigate any bearing running above ambient +40°F. | Every PM | MEC |
| Check driver coupling alignment indicator or flexible coupling insert condition; report any visible wear, cracking, or misalignment signs. | Quarterly | MEC |
Lubrication
| Task | Freq | Type |
|---|---|---|
| Lubricate pump bearing housings per manufacturer spec — confirm correct grease type and quantity; do not over-grease. | Quarterly | MEC |
Operational Checks
| Task | Freq | Type |
|---|---|---|
| Perform weekly churn test (no-flow test): start pump, allow to run for minimum 10 minutes, verify pressure at churn is within ±5% of rated churn pressure, then shut down normally. | Weekly | ALL |
| Check diesel engine fuel level (if diesel-driven); top off as needed and inspect for fuel leaks at lines, filter, and injectors. | Weekly | MEC |
| Check diesel engine oil level and coolant level; top off to manufacturer spec if low; note any discoloration or contamination. | Weekly | MEC |
Electrical Inspection
| Task | Freq | Type |
|---|---|---|
| Verify controller (electric start panel or diesel control panel) shows no fault or alarm indicators; document any active alarms. | Every PM | ELE |
| Confirm auto-start pressure settings are set correctly; check pressure gauges on suction and discharge for normal operating pressures. | Monthly | ELE |
| Inspect battery banks for corrosion, secure connections, and adequate charge; confirm charger is functioning on diesel or electric backup systems. | Monthly | ELE |
Reference Checklist — Full Task Library
Visual Inspection
| Task | Freq | Type |
|---|---|---|
| Inspect pump casing, suction and discharge piping, flanges, and all fittings for visible leaks or seepage; document location and severity of any findings. | Every PM | MEC |
| Check packing gland condition: packing should allow approximately 1 drop/min drip at full pressure; tighten gland nuts incrementally if excessive. For mechanical seals, confirm seal face is dry — any continuous leakage requires seal replacement. | Every PM | MEC |
| Verify all suction and discharge isolation valves are in correct operating position; confirm OS&Y (outside stem and yoke) valves are fully open with stem visible; record valve positions. | Every PM | MEC |
| Inspect mechanical room for flooding, temperature extremes, or environmental conditions that could impair pump or controller operation; confirm heat is maintained above 40°F in cold climates. | Every PM | ALL |
Operational Checks
| Task | Freq | Type |
|---|---|---|
| Measure and record suction pressure and discharge pressure during churn test; compare to baseline — deviation >5% from rated churn pressure warrants investigation. | Weekly | MEC |
| Perform weekly no-flow (churn) test: start pump via auto-start pressure drop simulation, run minimum 10 minutes, verify churn pressure is within ±5% of rated, record start time, run time, and shutdown mode. | Weekly | ALL |
| Verify jockey (pressure maintenance) pump operation: confirm it cycles to maintain system pressure, does not run continuously, and shuts off cleanly; excessive cycling indicates a leak in the system. | Monthly | MEC |
| Check diesel engine fuel: verify tank level, inspect fuel lines and filter for leaks or chafing; test fuel day tank transfer pump if equipped; note fuel age and schedule replacement if >12 months old. | Monthly | MEC |
| Run diesel engine on load for minimum 30 minutes monthly: record oil pressure, coolant temp, RPM, and exhaust characteristics; investigate smoke, knock, or abnormal readings. | Monthly | MEC |
| Review alarm history, test logs, and prior PM records; confirm all previous deficiencies have been corrected or are tracked on open work orders; update pump test log book. | Every PM | ALL |
| Check pump shaft and impeller for cavitation damage or erosion indicators: unusual noise, vibration, or performance loss are primary indicators; plan internal inspection if cavitation is suspected. | Semi-Annually | MEC |
| Inspect system pressure relief valve (if equipped): verify it is not passing or weeping; confirm set pressure is correct; do not adjust in the field without engineering approval. | Semi-Annually | MEC |
| Perform annual full-flow performance test per NFPA 25: record flow, suction pressure, and discharge pressure at 100%, 150%, and churn; compare to nameplate and prior year baseline; flag any degradation >5%. | Annually | MEC |
| Check diesel engine oil level and condition; inspect coolant level, color, and freeze protection rating; top off as needed; schedule oil/filter change per manufacturer interval. | Weekly | MEC |
Mechanical Inspection
| Task | Freq | Type |
|---|---|---|
| Inspect and lubricate pump bearings per manufacturer spec — confirm correct grease type, quantity, and interval; check bearing temperature during operation (should not exceed ambient +40°F); document readings. | Quarterly | MEC |
| Inspect flexible coupling or rigid coupling for wear, cracking, spider/insert deterioration, and proper gap; verify coupling guard is in place and secure. | Quarterly | MEC |
| Inspect motor terminal box: check for moisture, corrosion, loose connections, and correct wire terminations; torque terminal lugs to spec. | Semi-Annually | ELE |
Electrical Inspection
| Task | Freq | Type |
|---|---|---|
| Inspect electric fire pump controller: check for fault or alarm indicators, confirm power-on LED is active, verify phase monitoring relay is functional; record any alarm history from controller display. | Monthly | ELE |
| Verify pressure switch settings for auto-start: confirm cutout and cut-in pressures match design; test auto-start by dropping system pressure below start setpoint; document start pressure and time-to-start. | Monthly | ELE |
| Test diesel engine battery system: measure specific gravity or open-circuit voltage on both start battery banks; confirm charger output voltage is within spec; clean and tighten terminals if needed. | Monthly | ELE |
| Test automatic transfer switch (ATS) or phase monitor: confirm motor will start on loss of normal power; test sequence per manufacturer procedure; document results. | Semi-Annually | ELE |
| Verify electric motor insulation resistance with megohmmeter (1000V DC for LV motors): record reading; >100 MΩ = acceptable, 10–100 MΩ = monitor, <10 MΩ = investigate before returning to service. | Annually | ELE |
Failure Modes This Checklist Targets
Failure to Start on Demand The pump's only job. Controller faults, dead batteries on diesel systems, pressure switch drift, and corroded starter contacts all create a pump that passes every visual inspection and fails the only test that matters — the one during an actual fire.
Mechanical Seal and Packing Failure Seal leakage is normal within spec. Continuous or escalating leakage is a failure mode developing in real time. A sprinkler pump that runs dry at startup because the mechanical room flooded from an uncontrolled seal leak is not a hypothetical.
Impeller and Volute Deterioration Long idle periods, intermittent operation, and standing water conditions accelerate corrosion and erosion inside the pump casing. Performance loss discovered during an annual flow test — not during a fire — is the best-case outcome. Discovering it during a fire is the other kind.
Coupling Failure Coupling inserts degrade on their own schedule, not yours. A coupling that looked fine three months ago can fail silently between PMs. Quarterly inspection is the minimum. Any visible cracking or spider deterioration is an immediate replacement, not a "watch it" item.
Diesel Engine Unreadiness Stale fuel, discharged batteries, low coolant, degraded oil — a diesel fire pump that hasn't been run under load monthly may start during a weekly churn test and fail to sustain under actual flow demand. Monthly load runs are not optional.
Jockey Pump Masking System Leaks A jockey pump that runs continuously is covering for a leak somewhere in the system. That leak is holding system pressure artificially — and reducing the margin before the main fire pump auto-starts on a real demand. Jockey pump behavior is a system diagnostic, not just an equipment check.
Related Checklists
More pump PM checklists for related applications:
The pump you never think about is the one that fails when you need it most. This checklist exists so you think about it — on schedule, with documentation, before something is burning.
