What problems should be paid attention to in the installation of fire pump pipelines?

1. When installing the water inlet pipe, the horizontal section should be horizontal or upward
Doing so will cause air to accumulate in the water inlet pipe, reduce the vacuum degree of the water pipe and the water pump, reduce the suction head of the water pump, and reduce the water output. The correct way is: its horizontal section should be slightly inclined towards the water source, it should not be horizontal, let alone tilt upward.
2. Many elbows are used on the water inlet pipe
If many elbows are used on the water inlet pipe, it will increase the local water flow resistance. And the elbow should turn in the vertical direction, and it is not allowed to turn in the horizontal direction, so as not to gather air.
3. The water inlet of the water pump is directly connected with the elbow
This will cause uneven distribution of water flow through the elbow and into the impeller. When the diameter of the water inlet pipe is larger than the water inlet of the water pump, an eccentric reducer should be installed. The flat part of the eccentric reducer should be installed on the top, and the inclined part should be installed on the bottom. Otherwise, the air will accumulate, the water output will decrease or the water will not be pumped, and there will be impact noise. If the diameter of the water inlet pipe is equal to that of the water pump inlet, a straight pipe should be added between the water inlet of the water pump and the elbow, and the length of the straight pipe should not be less than 2 to 3 times the diameter of the water pipe.
4. The last section of the water inlet pipe equipped with a bottom valve is not vertical
If installed in this way, the valve cannot close by itself, causing water leakage. The correct installation method is: the bottom section of the inlet pipe with a bottom valve is vertical. If it cannot be installed vertically due to terrain conditions, the angle between the axis of the water pipe and the horizontal plane should be more than 60°.
5. The position of the water inlet of the water inlet pipe is wrong
(1) The distance between the water inlet of the water inlet pipe and the bottom and wall of the water inlet pool is smaller than the diameter of the water inlet. If there is dirt such as mud and sand on the bottom of the pool, if the distance between the water inlet and the bottom of the pool is less than 1.5 times the diameter, it will cause poor water intake or suction of mud and sand debris during pumping, which will block the water inlet.
(2) If the depth of the water inlet of the water inlet pipe is not enough, it will cause vortices on the water surface around the water inlet pipe, which will affect the water inlet and reduce the water output. The correct installation method is: the water depth of small and medium-sized water pumps shall not be less than 300-600mm, and the depth of large-scale water pumps shall not be less than 600-1000mm.
6. The outlet pipe is above the normal water level of the outlet pool
If the water outlet is above the normal water level of the outlet pool, the pump head will be increased, but the flow rate will be reduced. If the water outlet must be higher than the water level of the water outlet due to terrain conditions, an elbow and a short pipe should be installed at the mouth of the pipe to make the water pipe a siphon type and reduce the height of the water outlet.