Inspection, Testing, and Maintenance

A fire sprinkler system that is not inspected, tested, and maintained is a fire sprinkler system that may not work when it matters. NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, establishes the minimum requirements for keeping these systems operational throughout their service life.

NFPA 25 overview

NFPA 25 is the companion standard to NFPA 13. Where NFPA 13 governs design and installation, NFPA 25 governs the ongoing care of the system after it is placed in service.

Purpose

The standard exists to ensure that water-based fire protection systems remain in reliable operating condition. Systems degrade over time due to corrosion, mechanical damage, environmental changes, and building modifications. Regular ITM activities detect and correct problems before they cause a system failure during a fire.

Scope

NFPA 25 covers all water-based fire protection systems including:

• Sprinkler systems (wet, dry, preaction, deluge)
• Standpipe and hose systems
• Fire pumps
• Water storage tanks
• Water spray fixed systems
• Foam-water systems
• Fire service mains (underground)

Building owner responsibility

The building owner is ultimately responsible for ensuring that ITM is performed on schedule and that the system is maintained in operating condition. The owner may contract with a qualified fire protection service company, but the responsibility cannot be delegated. The owner must:

• Ensure ITM is performed at the frequencies required by NFPA 25
• Correct deficiencies identified during inspections and tests
• Maintain records of all ITM activities
• Notify the AHJ and insurance carrier of impairments

Who performs ITM

• Routine visual inspections (weekly and monthly) can be performed by trained building maintenance personnel
• Testing and maintenance activities requiring specialized knowledge, tools, or certifications must be performed by qualified personnel
• Many jurisdictions require that ITM service companies hold a fire protection contractor license
• NICET certification, state licensing, and manufacturer training may be required depending on the jurisdiction and the equipment being serviced

Weekly checks

Weekly inspections are visual checks that verify the system is in normal ready condition. They take minutes to perform and catch problems early.

Valve positions

• Verify all control valves are in the open position (fully open, with the stem indicating open)
• Check that valve supervisory devices (tamper switches) are connected and not in alarm
• Confirm valve rooms and enclosures are accessible and not obstructed

Building conditions

• Verify building temperatures are adequate to prevent freezing in areas protected by wet systems (minimum 40 degrees Fahrenheit)
• Check that sprinkler heads are not obstructed, damaged, painted, or corroded
• Verify sprinkler system signage is in place and legible

Pump house conditions (where applicable)

• Verify pump room temperature is adequate (minimum 40 degrees Fahrenheit for the pump and 70 degrees Fahrenheit for diesel engine controllers)
• Check that the pump is in automatic mode
• Verify fuel levels for diesel-driven fire pumps
• Check for unusual conditions: leaks, unusual noises, or warning lights

Monthly and quarterly activities

These inspections and tests verify that alarm and supervisory devices function correctly and that system components are in normal condition.

Monthly

• Gauges: inspect all system and pump pressure gauges for normal readings and physical condition
• Control valves: inspect locked or supervised valves to verify they are in the correct position
• Alarm devices: visually inspect waterflow alarm devices and fire department connections for physical damage and accessibility

Quarterly

• Alarm device testing: test all waterflow switches by opening the inspector test connection and verifying alarm transmission to the fire alarm panel and monitoring station
• Tamper switch testing: operate tamper switches to verify signal transmission within the first two turns of the valve handwheel
• Supervisory signal testing: test all supervisory signals (low air, low temperature, valve position) for proper transmission
• Low-point drain inspection: inspect and operate low-point drains on dry and preaction systems to remove condensation

Annual tests

Annual tests verify that the system can perform as designed under operating conditions.

Main drain test

• Open the main drain valve fully and record the static pressure (before opening) and residual pressure (while flowing)
• Compare results to the original acceptance test results and the previous year's test
• A significant drop in residual pressure (more than 10 percent) indicates a possible problem with the water supply, a partially closed valve, or an obstruction in the underground main
• The main drain test is the single most important annual test for verifying water supply adequacy

Inspector test connection

• Open the inspector test connection (the most remote test connection on the system) to verify waterflow alarm activation
• Time the alarm: the waterflow switch must activate within 90 seconds of sustained flow
• Verify the alarm signal reaches the fire alarm panel and the monitoring station
• Close the connection and verify the alarm restores to normal

Trip test for dry, preaction, and deluge systems

• For dry pipe systems: trip the dry valve by opening the inspector test connection or the priming level test connection, depending on the valve type
• Measure the trip time from the drop in air pressure to the flow of water at the inspector test
• For preaction systems: test the detection system operation and verify the valve opens on detection signal
• For deluge systems: test the detection system and verify the valve opens fully
• After the trip test, completely drain the system, reset the valve per the manufacturer instructions, and restore to service

Sprinkler head inspection

• Visually inspect all sprinkler heads for loading (dust, grease, paint), corrosion, physical damage, and proper orientation
• Heads showing any of these conditions must be replaced
• Heads installed in harsh environments (cooking areas, corrosive atmospheres) require more frequent inspection
• Where heads cannot be visually inspected (concealed heads with cover plates), inspect a representative sample

5-year activities

Five-year intervals trigger more intensive inspections and tests that assess internal conditions not visible during routine checks.

Internal pipe inspection (obstruction investigation)

• Open flushing connections at strategic points in the system and inspect the internal pipe condition
• Look for evidence of MIC (microbiologically influenced corrosion), foreign material, scale buildup, and pipe wall thinning
• If obstructing material is found, a full obstruction investigation per NFPA 25 Chapter 14 is required, which may include flushing, chemical treatment, or pipe replacement
• Internal inspections are especially critical for dry systems, which are more susceptible to corrosion due to the air/water interface

Dry valve internal examination

• Remove and internally inspect dry pipe valves, preaction valves, and deluge valves
• Clean, repair, or replace internal components as needed per the valve manufacturer service instructions
• Test the valve for proper operation before returning to service
• Replace gaskets, seats, and other consumable parts on the manufacturer recommended schedule

Gauge replacement or calibration

• All gauges must be replaced or calibrated at 5-year intervals
• Replacement is generally more cost-effective than calibration for standard system gauges
• Gauges must be accurate within 3 percent of full scale
• Ensure replacement gauges have the correct range and connection size for the application

Impairment procedures

Any time a fire sprinkler system is taken out of service, whether for maintenance, repair, or building construction, specific impairment procedures must be followed to manage the increased fire risk.

Tagging

• Place a clearly visible impairment tag on the system riser or control valve identifying the system, the date and time of impairment, the reason, and the responsible person
• The tag remains in place until the system is fully restored to service
• Many jurisdictions and insurance carriers require the use of specific tag formats

Notification

Before impairing a system, notify:

• The building owner or owner's representative
• The fire alarm monitoring company
• The local fire department
• The insurance carrier (required by most property insurance policies)
• Building occupants, where required by the fire code or building management policy

Fire watch requirements

• A fire watch is required whenever a fire sprinkler system is impaired in an occupied building
• The fire watch consists of trained personnel who patrol the affected area at regular intervals (typically every 30 minutes to 1 hour)
• Fire watch personnel must have communication equipment and access to fire extinguishers
• The fire watch continues until the system is fully restored to service
• Document the fire watch with patrol logs showing the name of the watch person, patrol times, and any observations

Restoring service

• When the impairment is resolved, fully restore the system to normal operating condition
• Open all control valves and verify they are supervised
• Verify system pressure readings are normal
• Remove the impairment tag
• Notify all parties who were informed of the impairment that the system is back in service
• Document the restoration in the impairment log

Documentation

NFPA 25 requires that all ITM activities be documented and that records be maintained for the life of the system or as required by the AHJ.

Record keeping requirements

• All inspections, tests, and maintenance activities must be recorded with the date, the person performing the work, and the results
• Deficiencies must be documented along with the corrective action taken and the date of correction
• Impairment records must include the start and end times, the reason, and the notifications made
• Records must be available to the AHJ upon request

NFPA 25 forms

NFPA 25 Annex D provides sample forms for documenting ITM activities. While the specific forms are not mandatory, the information they capture is. Key forms include:

• Sprinkler system inspection and test form
• Fire pump test form
• Main drain test form
• Impairment log
• Obstruction investigation report

Electronic vs. paper records

• Electronic records are increasingly common and are acceptable to most AHJs
• Electronic systems offer advantages in scheduling, trend tracking, and multi-site management
• Paper records remain acceptable and are still used by many service companies
• Regardless of format, records must be legible, complete, accessible, and protected from loss
• Many inspection management software platforms integrate with building management systems and provide automated reminders for upcoming inspections

Common deficiencies found during inspections

Experienced ITM technicians encounter the same problems repeatedly. Knowing what to look for makes inspections more efficient and helps building owners prioritize corrections.

Frequently found issues

• Painted heads: other trades spray-paint over sprinkler heads during renovation or redecoration; every painted head must be replaced
• Obstructed heads: stock piled too close to sprinkler deflectors (must maintain 18-inch clearance for standard heads), partition walls added without relocating heads, or light fixtures installed directly below heads
• Closed valves: control valves found partially or fully closed with no impairment tag; this is the single most common cause of sprinkler system failure in fires
• Missing escutcheons: escutcheons that have fallen off or were never installed, leaving gaps around heads that allow hot gases to bypass the ceiling barrier
• Corroded pipe and heads: visible corrosion on pipe, fittings, or heads indicates an environment or water chemistry problem that will worsen over time
• Expired heads: heads that are over 50 years old (standard) or 20 years old (fast-response and residential) must be tested or replaced per NFPA 25
• Non-functional gauges: gauges reading zero, pegged at maximum, or with broken lenses
• Missing or empty spare head cabinets: the spare head cabinet is often raided for renovation projects and never restocked
• Inadequate clearance around valves and FDC: equipment, storage, or landscaping blocking access to control valves or fire department connections