The efficiency of the fire pump is mainly affected by the three efficiencies of machinery, volume and hydraulics. Specifically, the main factors that affect the efficiency of the fire pump can be divided into the following types:
1. The efficiency of the fire pump itself is a fundamental influence. The efficiency of fire pumps under the same working conditions may differ by more than 15%.
2. The operating conditions of the fire pump are lower than the rated conditions of the fire pump, the fire pump has low efficiency and high energy consumption.
3. The efficiency of the motor remains basically unchanged during operation. Therefore, it is very important to choose a high efficiency motor.
4. The effect of mechanical efficiency is mainly related to design and manufacturing quality. After the fire pump is selected, the impact of later management is small.
5. Hydraulic loss includes hydraulic friction and local resistance loss. After the fire pump runs for a period of time, it is inevitable that the surface of the impeller and guide vane and other components will wear out, hydraulic loss will increase, and hydraulic efficiency will decrease.
Fire pump efficiency factors:
6. The volume loss of the fire pump is also called leakage loss, including the three leakage losses of the impeller sealing ring, interstage, and axial force balance mechanism. The level of volumetric efficiency is not only related to design and manufacturing, but also related to later management. After the fire pump runs continuously for a period of time, due to the friction between the components, the gap increases and the volumetric efficiency decreases.
7. The fire pump is evacuated and idling due to clogging of the filter cylinder and intake of the pipeline.
8. Before the fire pump is started, employees do not pay attention to the preparation work before the fire pump is started. The basic operation rules such as warm fire pump, pan fire pump, and fire pump are not in place, often causing cavitation of the fire pump, causing the fire pump to be noisy. Large vibration and low fire pump efficiency.
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