Fire pump acceptance testing: what happens on test day

Fire protection · 24 Oct 2026

A new fire pump is not accepted because it runs. It is accepted because it delivers its rated performance, in place, with the real controller, driver and water supply. That proof is the field acceptance test.

In NFPA 20 (Standard for the Installation of Stationary Pumps for Fire Protection), acceptance requirements sit in the chapter on acceptance testing, performance and maintenance. This article explains the usual sequence in plain terms. It does not replace the standard or the local fire authority.

Before the test day

Most failed tests fail before the pump is started. Check these first.

Piping is flushed and pressure tested

The suction and discharge piping should be flushed so that debris does not reach the pump or the system. Published guidance describes flushing at a target of 150% of rated flow where the supply allows it. The piping should also pass its hydrostatic test. A figure often cited for this is at least 200 psi, or 50 psi above the maximum system pressure, whichever is higher.

Wiring and controls are complete

All pump and controller wiring should be finished before the test. One city building authority lists this as a condition before it will witness the test.

The right people are present

Typical attendees are:

• the installing contractor;
• a representative of the pump manufacturer and, often, the controller manufacturer;
• the owner or the owner's engineer;
• the authority having jurisdiction (AHJ), or its delegate.

Agree the attendance list and the test procedure in writing in advance.

Instruments are calibrated

Flow meters, pressure gauges and tachometers should have current calibration certificates. Results are only as good as the instruments.

The flow test

The pump is run at three main points and the results are compared with the manufacturer's certified test curve.

Two long-standing performance limits are widely quoted for centrifugal fire pumps:

• at churn, net pressure should not exceed 140% of rated net pressure;
• at 150% of rated flow, net pressure should be at least 65% of rated net pressure.

At each point, record:

• suction and discharge pressure;
• flow;
• speed;
• for electric motors, voltage and current on each phase.

If the water supply cannot provide 150% flow, published guidance says the pump should be tested at least at rated flow or at the highest system demand. The AHJ decides whether that is acceptable.

During the run, also watch for:

• overheating of bearings, packing or the driver;
• excessive vibration;
• unusual noise;
• leaks at seals and flanges.

Controller and start tests

The flow curve proves the pump. The start tests prove the controls.

Guidance based on NFPA 20 describes a minimum of six manual starts and six automatic starts. Automatic starts are normally triggered by lowering pressure in the sensing line, as a real fire demand would.

Where an alternate power source exists, part of the start sequence is repeated on that source. A loss of normal power is also simulated while the pump runs at peak load.

Alarm and supervisory signals from the controller should also be confirmed at the fire alarm panel. Follow the controller and driver manufacturers' test instructions for the remaining checks.

Records to keep

The acceptance test is only useful if it is documented. Keep:

• the signed acceptance test report with all readings;
• the manufacturer's certified pump curve, with the field curve plotted against it;
• calibration certificates for the test instruments;
• as-built drawings and the controller wiring diagram;
• operation and maintenance manuals.

This acceptance report becomes the baseline for later periodic flow tests. Without it, later performance loss is hard to prove.

Common problems

• Suction pressure drops too low at 150%. Check the supply, any open or partly closed valves, and suction strainers.
• Field curve sits well below the factory curve. Check speed, impeller trim, rotation direction and instrument calibration.
• The pump starts but does not stay running. Check the controller settings and the running-period timer.
• Alarms do not reach the panel. Check the monitoring circuits before test day, not during it.

Summary

A good acceptance test is planned, witnessed and recorded. Flush and pressure test the piping, complete the wiring, calibrate the instruments, and agree the procedure with the AHJ. Then test the flow points and the starts, and keep the report as the pump's lifetime baseline.

General guidance only. The authority having jurisdiction and the official text govern.