As water flows from the tank outlet, a vortex tends to form, introducing air into the suction piping and increasing the occurrence of turbulent flow. The sprinkler system pressure drops significantly when one or more fire sprinklers are exposed to heat above their design temperature, and opens, releasing water. A fire pump is a device that provides the required water flow and pressure for a fire protection system. Horizontal split case fire pumps, also called double-suction fire pumps, are the most common types of fire pumps. Note that each controller, the one for the jockey pump and the one for the fire pump, must have its own independent pressure sensing line that connects the fire protection system with the pressure switches in each controller. Typical discharge conditions would be 17,600 l/min @ 12 barg. For instance, New York City requires a manual round rotor fire pump with every automatic fire pump, and the Ohio EPA requires suction control valves on every fire pump to prevent going below 20 psi in the main. The Zurn Wilkins ZW215FP Fire Pump Suction Control Valve controls the suction pressure to a Fire Pump, preventing cavitation and potential backflow conditions. The fire pump starts when the pressure in the fire sprinkler system drops below a threshold. Horizontal Split Case Fire Pumps. Where fire pumps are installed in a series, butterfly valves are not permitted to be installed between the pumps. If a fire pump pressurizes the system, the pressure requirements of the fire sprinkler system and the fire department’s use are primary considerations for pump selection. They typically come rated for 250-5000gpm. Low suction pressure cut-off controls are available that will automatically shut down stationary fire pumps that receive water from municipal water supply sources when the water supply pressure reduces to 140 kPa (20 psig) or lower at the suction side of the pump. If you're being asked to find the suction pressure of a pump, there are two ways to interpret that request. Liquid Fillable Fire Pump Gauge. A fire pump bypass is required on all fire pumps where the suction supply is of sufficient pressure to be of material value without the pump (NFPA 20-2013, Section 4.14.4). Interestingly, horizontal split case pumps were the first type of fire pump used in fire protection systems.

When you need to dewater the jobsite, low flow means more downtime for the crew, costing money and putting deadlines at risk. Standard features ease maintenance and repair to provide the lowest ownership costs. The amount of water that goes through the impeller is a function of water discharging through an opening downstream of the fire pump. Pump Troubleshooting Water Pump Problems: Low suction or flow rate. If the pump can develop 100 psi boost and the total head loss developed was 10 psi we would expect to see the discharge side of the pump … Fire pump discharge pressure: Centrifugal fire pumps increase water pressure by sending water through a spinning impeller. Some jurisdictions have special requirements for fire pumps. These valves should be installed according to manufacturers’ recommendations in the piping between the pump and the discharge check valve. Pump has operating duty of 165psi, 17,500 L/min. The larger the opening, the higher the flow of water. The jockey pump pressure switch is normally set at a higher pressure so that the jockey pump starts before the fire pump.

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