Some users after measurement, although the water reservoir or water tower to the vertical distance from the water surface is slightly less than the pump head, but a small amount of water or Sheung Shui. The reason is that the pipe is too long, the water pipe bends more, the water flow in the pipeline resistance loss is too large. The reason is that the pipe is too long, the water pipe bends more, the water flow in the pipeline resistance loss is too large. Under normal circumstances 90 degrees bend than 120 degrees, the resistance is large, every 90 degrees bend head loss of about 0.5 to 1 meters, meters per 20 meters of resistance can make the head loss of about 1 meters. In addition, a part of the user is also free pump inlet and outlet pipe diameter, which has a certain impact on the head.
