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The difference between diesel multistage fire pump and single-stage fire pump

Fire pump is a kind of water pump widely used in environmental protection, sewage treatment and fire fighting units. It is similar to the general pump, but its head and total flow are different. And the pump can also be divided into single-stage and multi-stage two forms according to the structure.

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The difference between single-stage fire pump and multi-stage fire pump:
1. The number of impellers is different, and the lift is also different: Generally speaking, a single-stage pump has only one impeller, while a multi-stage pump has two or more impellers, which enables it to absorb water under pressure many times and carry out Segmented processing, which greatly increases the lift. Therefore, under the same medium flow, the lift of the multi-stage fire pump appears higher.​​
2. The number of motors is different, and the action efficiency is also different: the motor of a single-stage pump is usually only one, while the motor of a multi-stage pump is mixed with two or more, which means that the multi-stage fire pump The power will be greater than a single stage fire pump. Relatively, it is more time-saving than a single-stage fire pump to use, and the scope of use is wider.​​
3. The curve of the medium flow is different: with water as the basic medium, the water flow curve of the single-stage pump will be relatively uneven. If the pressure increases or the water flow is small, the lift will be very large. In this case, the pressure at the outlet will be too large, or even exceed the load.

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    Generally speaking, we recommend that where natural ventilation is used to install diesel engine fire pumps, there must be vents and exhaust ports of sufficient size, and the position of the vents ensures that there is enough fresh air to supply the diesel engine for combustion within the temperature limit. Of course, the water supply radiator can also be used to take away the heat of the circulating cooling water and the heat emitted from the surface of the unit. If the space cannot meet the requirements of natural ventilation and cannot effectively dissipate heat, it is recommended that you adopt forced ventilation, install an intake fan and an exhaust fan at the vent, and choose a location that can provide enough cold air for the diesel engine and take away the machine room hot air inside. Generally speaking, the air intake of the unit should be 6-7 times that of the diesel engine. Only in this way can normal ventilation be ensured and the operating efficiency of the equipment can be improved.

    In addition, it must be fixed firmly so that the entire unit can be supported to ensure that the unit is in a horizontal state and absorb vibration. Generally speaking, the foundation of the unit adopts a concrete structure. The length and width are 150-250mm on one side of the length and width of the unit chassis, and the depth is 300-600mm. The height of the anchor bolts should be about twice the bolt diameter. And there should be a 750mm channel on both sides and front of the unit to facilitate the operator’s inspection and general maintenance.