NFPA 25 Inspection, Testing, and Maintenance
This domain tests whether you know what NFPA 25 requires, how often, and the difference between an inspection (looking), a test (operating), and maintenance (repairing). The exam often presents a component and asks for its interval.
Core intervals to know
- Gauges: wet-pipe system gauges monthly; dry-pipe and preaction air pressure gauges weekly.
- Control valves: weekly inspection of position; tamper switches tested semiannually.
- Main drain test: annually.
- Waterflow alarm devices: quarterly.
- Dry-pipe valve trip test: annually; full-flow trip test every three years where required.
- Internal pipe inspection: every five years for wet systems, and when conditions suggest obstruction.
- Gauge replacement: every five years.
- Fire pump: weekly churn run; annual flow test.
- Antifreeze solution: annual concentration test.
- Spare sprinkler stock: annual inventory and condition check.
Inspection versus test
Inspecting a valve means confirming it is open, supervised, and not leaking. Testing a valve means operating it and observing the result. Maintenance includes replacing gauge glass, clearing obstructions, and repairing leaks. NFPA 25 does not authorize a contractor to redesign the system during routine ITM.
Worked example
A dry-pipe system serves an unheated warehouse. The air gauge is read weekly, not monthly, because loss of air pressure can lead to a frozen or tripped valve. The dry valve gets an annual trip test, and the full-flow trip test is scheduled on the three-year cycle. The main drain test is annual. If the trip test shows water delivery beyond the system's design expectation, that is a deficiency to investigate, not merely a log entry.
Traps that cost marks
Using one interval for all gauges. Forgetting the five-year internal pipe inspection. Treating the annual dry-valve trip test as the same thing as the three-year full-flow test. Recording an inspection when the standard requires an operational test. Failing to recognize that impaired systems need a documented impairment program and restoration plan.