Requirements for the water level of the water tank for fire pump self-priming water suction
The requirements for the water level of the water tank for the self-priming water suction of the fire pump mainly involve ensuring that the water pump can start smoothly and effectively absorb water, so as to meet the demand for fire water. The specific requirements are as follows:
1. Minimum effective water level requirements
Horizontal fire pump:
The minimum water level of the fire water tank that meets the self-priming pump should be higher than the vent hole at the top of the pump casing. This is to ensure that at the lowest water level, the water suction port of the water pump can still be submerged in water, so as to avoid the inhalation of air affecting the normal operation of the water pump.
Vertical fire pump:
For packing seal vertical fire pump, the minimum water level that meets the self-priming pump should be higher than the vent hole at the top of the water outlet flange of the water pump.
For mechanical seal vertical fire pump, the minimum water level that meets the self-priming pump should also be higher than the vent hole at the end of the mechanical seal gland on the upper part of the pump body. This is to ensure that the seal will not be damaged due to too low water level, while ensuring the water suction efficiency of the water pump.
2. Other water level requirements
Although the main focus is on the minimum effective water level, fire water tanks usually have other water levels, such as the maximum water level, the maximum alarm water level, the minimum alarm water level and the overflow water level, to ensure the normal operation of the pool and the sufficiency of fire water.
3. Precautions
Pool bottom position: The bottom of the fire water tank should not be lower than the pump ground. This is to prevent the pump from sucking in impurities or air due to the low bottom of the pool during operation.
Suction pipe submersion depth: According to relevant regulations, the submergence depth of the fire pump suction port should meet the requirements for the safe operation of the fire pump at the minimum water level. For horizontal and vertical fire pumps, this depth needs to be determined according to the specific pump model and performance, but generally should not be less than 600mm.
Suction port setting: When there is no suction well at the suction port, a vortex preventer should be set at the suction port to reduce the impact of water flow turbulence on the performance of the pump.
