It is not allowed for a fire fightng pump to run idle during use. So, what causes the fire pump to run idle? How to resolve this issue? Let's take a look together below! The majority of users are not very familiar with the reasons for idling, nor do they know how to solve it well. In fact, idling for a short period of time will not cause damage (within 1 minute). But the hazards of idling during the use of fire fighting pumps are very significant. So, what are the specific hazards? Below, the editor will summarize for everyone.
The reasons for the idling of fire pumps include insufficient inlet medium or insufficient inlet pressure, blocked inlet pipes, or incomplete air discharge in the chamber. When idling, the impeller has little or no contact with the medium, making it unable to work effectively and the liquid cannot be transported out normally. These are all useless efforts. Due to the lack of effective work, the load on the motor is very small, and the generated current is also very small, which has little impact on the motor. Idling does have a fatal effect on the pump.
Idle fire fighting pumps are prone to cavitation, causing damage to the pump body and flow components; The mechanical seal form or packing seal form of idling will not receive liquid lubrication, resulting in dry grinding and rapid damage; Idling rotor components and pump bodies generate heat without liquid cooling, and narrow gap positions (such as sealing rings) are easily bitten due to thermal expansion and contraction; The idle balance plate is not lubricated by anyone, and it will soon be burned or damaged.
It is recommended to upgrade the design of the fire fighting pump to a higher level for warning and maintenance of idle operation: treat each gap position and expand it under allowable conditions to prevent biting and death; Perform special processing on the shaft, such as quenching and tempering, heat treatment, etc., to increase hardness. Use materials with low flexibility to prevent large swinging and biting during idling; Use machine seals and packing chambers that do not require lubrication from liquid media; Choose sealed self-lubricating bearings that do not require refueling.
The pump chamber of the fire fighting pump has increased in volume compared to other pumps, providing a location for storing water. Before normal operation, the chamber should be filled with liquid, and there is a period of self suction before operation, during which air is continuously discharged outside the pump body. This period is considered partial idling.
Through the introduction of the fire pump manufacturer above, you should know why the fire pump is idling.
