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Fire Pumps
Fire pumps are critical parts of your fire protection system as they provide the water supply volume and pressure needed for your fire sprinkler system.
NFPA 25 requires a no-flow (churn) for electric motor driven fire pumps and diesel engine driven fire pumps.
Section 8.3.1.1
A no-flow test shall be conducted for diesel engine driven fire pumps on a test frequency in accordance with 8.3.1.1.1 or 8.3.1.1.2.
This allows the engine to establish a running speed and confirm that no problems exist such as overheating or lack of combustion air for the engine.
It is best to observe problems during periodic testing rather than discover them during a catastrophic event. Running the diesel engine weekly for 30 minutes also consumes some of the diesel fuel, which is susceptible to deterioration over time.
Section 8.3.1.2
Requires a churn test to be conducted weekly for electric motor–driven fire pumps:
- Serving fire protection systems in buildings that are beyond the pumping capacity of the fire department
- Fire pumps with limited service controllers
- Vertical turbine fire pumps
- Fire pumps taking suction from ground level tanks or a water source that does not provide sufficient pressure to be of material value without the pump
Section 8.3.1.2.2
Allows a monthly test frequency electric fire pumps not identified in the list above and for electric fire pump systems having a redundant fire pump. In all cases, the electric motor should be allowed to run for a minimum of 10 minutes and a qualified person should always be present in the pump room whenever any fire pump is running to make observations related to operating issues and to record results.
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