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How to choose Fire pump gear ratio

The rated power of fire pump should be less than 60% of chassis engine power, Acoording to the power take-off speed ratio of the chassis engine speed at 60% of the rated power and the rated speed of the water pump.  Fire pump,s gear ration normally include: 1.033, 1.178, 1.259, 1.316, 1.44,  1.541,  1.652,  1.772 etc, different models of water fire pump, different shaft power, from 73-150KW, rated speed from 2000-3200RPM.

Automotive Fire pump structure:

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