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Determine the efficiency of the fire pump is mainly affected by the mechanical, volumetric and hydraulic three kinds of efficiency, specifically, the main factors that affect the efficiency of the fire pump can be divided into the following categories:
1. The efficiency of the fire pump itself is the most fundamental impact. Fire pumps under the same operating conditions may vary in efficiency by more than 15%.
2. Fire pump operating conditions below the rated fire pump conditions, low fire pump efficiency, high energy consumption.
3. Motor efficiency in the use of the basic remain unchanged. So it is important to choose a high efficiency motor.
4. The main impact of mechanical efficiency and design and manufacturing quality. Fire pump selected, the latter part of the management less affected.
5. Hydraulic losses include hydraulic friction and local resistance loss. Fire pump operation for a certain period of time, inevitably cause impeller and vane and other parts of the surface wear and tear, hydraulic loss increases, reducing hydraulic efficiency.
6. Fire pump volume loss, also known as leakage losses, including the impeller seal ring, interstage, axial force balance of three types of leakage losses. The level of volumetric efficiency is not only related to the design and manufacture, but also related to the latter part of management. Fire pump continuous operation for a certain period of time, due to the friction between the parts, the gap increases, reducing the volumetric efficiency.
7. As a result of filter cylinder blockage, pipeline intake and other causes of fire pump pump down and idling.
8. Before the start of the fire pump, the staff did not pay attention to the preparatory work before the start of the fire pump. The implementation of the basic operation procedures such as warm fire pump, fire pump and perfusion fire pump is not thorough and often causes cavitation of the fire pump and causes fire pump noise Large, vibration, fire pump efficiency is low.
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