1.Horizontal open pump speed is low :
1).Artificial factors. Some users because of original motor damage, may be accompanied by another motor, resulting in a flow of small, low head or even the consequences of Sheung shui.
2).Mechanical failure of the pump itself. Impeller and pump shaft fastening nut loose or pump shaft deformation and bending, resulting in multi impeller, direct friction with the pump body, or bearing damage, it is possible to reduce the speed of the open pump.
3).Power machine repair problems. Motor due to the winding burn, and loss of magnetic, maintenance of the winding turns, wire diameter, wiring method changes, or maintenance of the failure is not completely ruled out factors also make the pump speed change.
2. Horizontal open pump suction process is too large :
Some of the water is deep, some of the surrounding terrain is relatively flat, while ignoring the horizontal open pump allows suction process, resulting in less water absorption or not the result of water absorption. To know that the opening of the pump can be built in the vacuum degree is limited, the absolute vacuum suction process is about 10 meters high water column, and the horizontal type of open pump can not establish an absolute vacuum. And the vacuum is spent, easy to make the pump water vapor, the horizontal in the pump is not working. Therefore, the centrifugal pump has its maximum allowable suction process, generally between 8.5 - 3 meters. Installation of the horizontal in the open pump can not only facilitate the simple map.
3.The resistance of water flow in and out of the pipe is too large:
Some users have been measured, although the water reservoir or water tower to the vertical distance of the water is also slightly less than in the pump head, but a little water or no water. 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 0.5-1 meters, meters per 20 meters of resistance can make the head loss of about 1 meters. In addition, some users are also free to open the pump inlet and outlet pipe diameter, which has a certain impact on the head.
