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NOTE: This is an unformatted excerpt from our online fire protection training library.

Automatic Sprinkler Inspection, Testing & Maintenance

Deluge/preaction valves

In addition to a the main drain test, a deluge valve must be full flow trip tested annuallyWhere waterflow would cause damage, the trip test may be conducted in a manner that does not require discharge into the protected area. This may be accomplished by using hoses or other specially designed devices to capture and drain the water from the area..  Where systems are arranged to shut down critical equipment, the flow test may be conducted during a scheduled shutdown.

The spray pattern from each sprinkler or spray nozzleKeep in mind that a deluge system uses typical open sprinkler heads. If specific spray nozzles are used, the system would be classified as a special system. But, the deluge valve can be the same for both. should be checked to assure it is not obstructed. If obstructions or distorted patterns are observed, the piping and sprinklers/nozzles should be removed and cleaned. Pressure readings should be taken at the most remote sprinkler head and at the deluge during the flow test. These pressures must be compared to the original hydraulic calculations to verify that the water supply is adequate and the system is functioning as designed.

NOTE: This is an unformatted excerpt from our online fire protection training library.

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