NFPA 25 Deficiency Found During a Routine Annual
During an annual NFPA 25 inspection of a 12-year-old wet system in a 6-story office building, the inspector finds: (1) the main drain reads 55 psi static and 40 psi flowing, with the system demand calculated at 38 psi at the base of the riser; (2) three sprinkler heads on the 4th floor show corrosion and paint; (3) the alarm check valve's retard chamber is clogged; (4) the spare head cabinet contains 6 heads but the building has 1,200 heads of two different types. The building manager says the system 'passed last year' and wants the report to show no deficiencies.
1. Evaluate each finding and classify it as a deficiency or not, with reasoning.
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(1) Main drain: a 15 psi drop from static to flowing is within typical acceptance for a main drain test, but the absolute flowing pressure of 40 psi versus a 38 psi demand leaves almost no margin. This should be flagged as a marginal supply condition requiring evaluation, not simply 'pass.' (2) Painted/corroded heads are deficiencies; paint can insulate the heat-responsive element and corrosion indicates a possible corrosive environment. They must be replaced and the cause investigated. (3) A clogged retard chamber is a deficiency affecting alarm operation and must be cleaned/repaired. (4) The spare head stock is inadequate: NFPA 25 requires a stock of spare heads of each type and temperature rating, with a minimum number based on the number of heads installed. Six heads for 1,200 heads of two types is short.
2. What should the inspector do about the manager's request to show no deficiencies?
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Refuse. The inspector's report must accurately reflect conditions; falsifying or omitting deficiencies is a violation of professional and code obligations and can expose the inspector and company to liability. The inspector should issue the report with deficiencies noted, provide the required notification to the owner, and explain the corrective actions and timeframes. If the manager persists, the inspector should escalate within the company and document the request.
3. What follow-up testing or maintenance would you recommend for the alarm check valve and the spare head issue?
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For the alarm check valve: clean the retard chamber, inspect the clapper and seat, and perform an alarm test to verify the water motor gong or alarm device operates within the required time. For spare heads: inventory the installed heads by type, temperature, and K-factor, then stock the required number of each type in a cabinet with the correct wrench(es). Also verify that the heads on the 4th floor are replaced with matching heads and that any corrosive atmosphere is addressed.