1. Flow: The flow of the pump is also called the water delivery volume, which refers to the amount of water delivered by the pump per unit time. Represented by the symbol Q, its unit is liter/second, cubic meter/second, cubic meter/hour.
2. Head: The head of the pump refers to the height at which the pump can pump water, usually represented by the symbol H, and its unit is meter. The head of the centrifugal pump is based on the centerline of the impeller and consists of two parts. The vertical height from the centerline of the pump impeller to the water surface of the water source, that is, the height at which the pump can suck water up, is called the suction head, referred to as the suction lift; the vertical height from the centerline of the pump impeller to the water surface of the outlet pool, that is, the water pump can press the water up The height is called the pressure water head, referred to as the pressure stroke. That is, water pump head = water suction head + water pressure head It should be pointed out that the head marked on the nameplate refers to the head that the water pump itself can produce, and it does not include the loss head caused by the frictional resistance of the pipeline water flow. When choosing a water pump, be careful not to ignore it. Otherwise, the water will not be pumped.
3. Power: In unit time, the amount of work done by a machine is called power. It is usually represented by the symbol N. Commonly used units are: kilogram m/s, kilowatt, horsepower. Usually the power unit of the electric motor is expressed in kilowatts; the power unit of the diesel engine or gasoline engine is expressed in horsepower. The power transmitted by the power machine to the pump shaft is called shaft power, which can be understood as the input power of the pump. Generally speaking, the pump power refers to the shaft power.
Due to the frictional resistance of the bearing and packing; the friction between the impeller and water when the impeller rotates; the vortex of the water flow in the pump, the backflow of the gap, the impact of the inlet and outlet, and the mouth of the fire pump. It must consume part of the power, so the pump cannot completely change the input power of the power machine into effective power, and there must be power loss, that is to say, the sum of the effective power of the pump and the power loss in the pump is the shaft power of the pump.
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