The 2 A.M. Sprinkler Flow in a High-Rise
A fire department responds at 2:14 a.m. to a kitchen fire on the seventh floor of a 12-story, 240-unit apartment building. One sprinkler has flowed. The fire is knocked down by 2:22 a.m., but water is running into the sixth-floor corridors and the alarm company is calling. The building engineer is off site, and the sprinkler contractor's emergency line goes to voicemail. The incident commander knows the basement riser room is locked and the building has a floor control valve assembly on each floor. About 300 residents are in the building, including elderly occupants on the lower floors. The fire department has a key to the riser room but not to the floor valve closets. The fire investigator is en route. The incident commander must decide whether to shut the building main, use a floor valve, or wait for the contractor, and what to tell the occupants.
1. Should the incident commander shut the building main control valve, isolate the floor, or wait for the sprinkler contractor? Explain the decision.
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The incident commander should first try to isolate the affected floor rather than shut the building main. A floor control valve assembly, where provided, allows the seventh-floor sprinkler system to be shut down while the rest of the building remains protected. That is the preferred action because it limits the water damage and preserves protection for the other 11 floors. The fire department may need to force the floor valve closet if the building cannot provide access and water is causing significant damage, but the incident commander should document why force was necessary. If the floor valve cannot be reached or operated, the incident commander may close the main control valve, but that creates a building-wide impairment. The decision should be based on fire control, water damage, and the risk to occupants, not on waiting indefinitely for a contractor who is not answering. The incident commander should not leave the building without protection. If the main is closed, the fire department must ensure a fire watch or other approved mitigation until the system is restored.
2. What notifications and documentation should occur before the fire department leaves the scene?
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The incident commander should notify the building owner or manager, the alarm company, the authority having jurisdiction, and the sprinkler contractor. The fire department should document the time of the fire, the sprinkler activation, the valve operations, the reason for isolating or shutting the system, and the identity of the person who operated the valve. The fire investigator should be told that the sprinkler operated and that the system was isolated. The building manager should be told in writing that the system is impaired and what must happen before it is restored. The fire department should not reset the fire alarm panel or reopen the valve without the contractor or the AHJ, because the cause of the flow and the condition of the check valve must be checked. If the main was closed, the fire department should confirm that the owner has arranged a fire watch and should notify the local fire official so that the impairment is tracked. The log entry should be specific enough for the fire official and the contractor to reconstruct the sequence.
3. What fire watch or protection measures are appropriate while the system is impaired, and who decides when to remove them?
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While the sprinkler system is impaired, the building should have a fire watch or approved patrols, with occupants notified and common areas checked. The fire watch should be continuous if the impairment is building-wide, or at defined intervals with documented rounds if the impairment is limited and the AHJ accepts that approach. The fire watch should look for smoke, fire, and blocked egress, and should have a way to notify the fire department immediately. The building owner is responsible for providing the fire watch, not the fire department that responded. The fire department can recommend or require it, but the owner must staff it. The system should not be returned to service until the contractor has repaired the cause of the flow, tested the affected valve and alarm, and restored the system. The fire official or the AHJ should approve removing the fire watch after the system is back in service and tested. If the contractor finds a damaged check valve or a closed valve, the fire watch should continue until the repair is complete and the main drain test confirms the supply.