Inspection, Testing, and Maintenance (ITM)
Domain 4: Inspection, Testing, and Maintenance (ITM)
This domain tests NFPA 25 practice: frequencies, acceptance criteria, and what a deficiency means. ITM is not a visual walkthrough; it produces measurable baselines that reveal closed valves, obstructions, and degraded supply.
Core rules
- Gauges are inspected monthly; waterflow alarm devices are tested quarterly; main drain tests are annual; internal pipe inspections are typically every five years.
- Dry-pipe valves require an annual trip test, with periodic full-flow trip testing; the exact interval follows the adopted NFPA 25 edition.
- A main drain test compares static and residual pressure with the baseline. A significant residual drop suggests a closed valve, obstruction, or supply problem.
- Fire pumps require weekly no-flow runs and annual flow testing under NFPA 25 and NFPA 20.
- Record results, deficiencies, and corrective actions; a test without a baseline is weak evidence.
Worked example
A main drain baseline is 80 psi static and 65 psi residual. The current test reads 78 psi static and 50 psi residual. Static is nearly unchanged, but residual has fallen 15 psi. That pattern points to a restriction or partially closed valve downstream, not a general supply loss. The reasoning: static pressure can remain high while flow is choked.
Traps
- Confusing installation acceptance tests with routine ITM.
- Skipping the baseline and judging only the current reading.
- Treating a gauge reading as a flow test.
- Failing to document a deficiency and its correction.