2019-07-09 18:01:48 Source: sand dredge pump-slurry pump parts-China Do Pump
Dredge pumps include on board dredge pump, ladder dredge pump, single walled dredge pump, double walled dredge pump, submersible dredge pump, booster dredge pump, hydraulic dredge pump etc.
Do pump is a dredge pump solution provide, including how to select dredge pump, dredge pump for sale, dredge pump design, and dredge pump problems and solution.
(1) The dredge pump is not filled with enough water before starting. Sometimes it seems that the water has overflowed from the venting hole, but the air is not completely discharged from the dredge pump shaft, so that a little air remains in the inlet pipe or dredge pump body.
(2) The horizontal section of the inlet pipe that is in contact with the water dredge pump applies a downward slope of more than 0.5% in the direction of the water flow, and the end connected to the inlet of the water dredge pump is the highest, not completely horizontal. If it is lifted up, air will remain in the inlet pipe, which will reduce the vacuum in the water pipe and the water dredge pump and affect the water absorption.
(3) The packing of the dredge pump has been worn out due to long-term use or the packing is too loose, causing a large amount of water to be ejected from the gap between the packing and the dredge pump shaft bushing. As a result, external air enters the inside of the dredge pump from these gaps. Affected the lifting of water.
(4) Because of the long-term potential of the inlet pipe, the hole in the pipe wall is corroded. After the dredge pump works, the water surface continuously drops. When these holes are exposed to the water surface, the air enters the water inlet pipe from the hole.
(5) Cracks appear at the inlet pipe bends, and slight gaps appear at the connection between the inlet pipe and the dredge pump, which may cause air to enter the inlet pipe.
(1) Human factors. Some users are randomly equipped with another motor to drive the original motor, resulting in low flow, low lift or even no water.
(2) Mechanical failure of the dredge pump itself. The impeller and the dredge pump shaft fastening nut are loose or the dredge pump shaft is deformed and bent, causing the impeller to move more, directly rubbing against the dredge pump body, or the bearing is damaged, which may reduce the rotation speed of the dredge pump.
(3) Power machine maintenance is not working. The motor is de-excited due to the burning of the windings. The number of winding turns, the wire diameter, the wiring method change during maintenance, or the failure to completely eliminate the fault during maintenance will also cause the dredge pump speed to change.
Some water sources are deeper, and some of the water sources have a flatter outer surface, ignoring the allowable suction of the dredge pump, resulting in less or no water absorption. It is important to know that the vacuum that can be established at the suction port of the dredge pump is limited. The absolute vacuum suction is about 10 meters high, and the dredge pump cannot establish an absolute vacuum. Moreover, the degree of vacuum is too large, which makes it easy to vaporize the water in the dredge pump, which is detrimental to the operation of the dredge pump. Therefore, each centrifugal dredge pump has its maximum allowable suction stroke, generally between 3-8.5 meters. When installing the water dredge pump, it must not be simple and simple.
Some users have measured that although the vertical distance from the reservoir or water tower to the water source is slightly smaller than the dredge pump lift, it is still small or impossible to lift. The reason is often that the pipeline is too long, there are many bends in the water pipe, and the water flow is excessively lost in the pipeline. The reason is often that the pipeline is too long, there are many bends in the water pipe, and the water flow is excessively lost in the pipeline. Under normal circumstances, the 90 degree bend is more resistant than the 120 degree bend, and the lift loss of each 90 degree bend is about 0.5-1 meters. The resistance of each 20 meter pipeline can cause the head loss to be about 1 Meter. In addition, some users also arbitrarily dredge pump the diameter of the pipe into and out of the pipe, which also has a certain impact on the lift.
(1) The bottom valve cannot be opened. Usually because the dredge pump is left too long, the bottom valve gasket is stuck, and the bottom valve without the gasket may rust.
(2) The bottom valve filter net is blocked; or the bottom valve causes the filter to become clogged in the sludge layer in the water.
(3) The impeller wear is serious. The impeller blades wear out over a long period of time, which affects the performance of the dredge pump.
(4) The gate valve can be faulty or blocked by the check valve, which will reduce the flow or even the water.
(5) The leakage of the outlet pipe will also affect the amount of water dredge pumped.
