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A vertical turbine type fire pump with a diesel engine attached on the right Antique Japanese fire pump Horse-drawn fire pump given to Brockhampton Estate in 1818 The portable fire pump normal pressure (PFPN) was standard equipment in many Żuk A-15 fire engines; ca. 1977. A fire pump usually refers to a pressure-increasing component of the ...
Typically the 200 psi inlet water pressure is reduced to 95 psi discharge pressure as a result of the narrowness of the venturi in the eductor device. Ejector See Smoke ejector. Ejector pump Pumps that use the venturi principle to pump water on a fire ground. Can be used for salvage by removing flood waters or supply water to a fire appliance ...
This is a crucial parameter for pump selection and is a popularly used parameter for ascertaining industrial requirements. By eliminating the inlet head, we remove the effect of the supplied pressure to the pump and are left with only the pump’s energy (head) contribution to the fluid flow. Schematic representation of pressure heads in a pump.
In a nozzle or other constriction, the discharge coefficient (also known as coefficient of discharge or efflux coefficient) is the ratio of the actual discharge to the ideal discharge, [1] i.e., the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an identical working fluid from the same initial conditions to the same exit pressures.
Using metric units, the volumetric flow rate of a nozzle is given by =, [1] [2] where q is the flow rate in litres per minute ( l/min ), p is the pressure at the nozzle in bar and K is the K-factor is given in units of (/) /.
In the United States, NFPA 1901 requires engines to have suction hose that matches the engine's pump rating. [12] For example, an engine with a 1,000-US-gallon (3,800 L) per minute pump is required to carry 5-inch (13 cm) or larger hose, [1]: 181 while a wildland fire engine will typically carry 2-to-2.5-inch (5.1 to 6.4 cm) hard suction hose.
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Typical components include a water source, a centrifugal pump, foam concentrate tanks, a direct-injection foam proportioning system on the discharge side of the pump, a mixing chamber or device, a rotary air compressor, and control systems to ensure the correct mixes of concentrate, water, and air.