Submersible pump failure causes and solutions Daquan

July 24, due to "cimarron" Xiamen City, water scavenging work into the final state, unexpectedly, yesterday at 11 o'clock, submersible pump "strike", regained water began to rise back. At present, the reasons for the pump to stop working is not yet known, the relevant experts are viewing, debugging, hoping to identify the reasons as soon as possible. Asian fluid network Xiaobian summing up the submersible pump failure causes and solutions, let's look at it. (I), the submersible pump often appear in the operation of the flow is insufficient or no water causes and treatment methods: (1) the installation of the pump is too high, making the impeller immersion depth is not enough, resulting in reduced water pump output; control of pump installation height tolerance, not Free to expand. (2) the opposite direction of the pump, the pump before running idle idling motor, check the steering so that it is consistent with the pump; use of the above conditions should check the power phase sequence is changed. (3) outlet valve can not be opened. Check the valve, and often to maintain the valve. (4) outlet pipe is not smooth or impeller is blocked. Clean up pipes and impeller blockage, often salvage debris in the reservoir. (5) wear-resistant ring at the bottom of the pump wear or debris was blocked. Clean up debris or replace the wear ring. (6) pumping fluid density is too large or too high viscosity. Find the cause of water quality changes and to manage. (7) impeller off or damaged. Reinforce or replace the impeller. (8) more than one pump shared pipeline output, there is no one-way valve or one-way valve is not installed tight seal. Check the cause of the installation or replacement of one-way valve. The submersible pump operation abnormal vibration, instability, the main reasons: (1) the pump base anchor bolts are not tightened or loose; even tighten all anchor bolts (2) the outlet pipe without additional support, the impact of pipe vibration Pump; on the pump outlet pipe set up an independent solid support, not to pump the water pipe flange load-bearing. (3) impeller quality imbalance or even damaged or loose installation; repair or replace the impeller (4) pump up and down the bearing damage; replacement pump up and down bearings. Iii, submersible pump caused by excessive current Motor overload or over-temperature of the main reasons: (1) working voltage is too low or too high; check the power supply voltage, adjust the transmission voltage. (2) There are moving parts inside the pump rub or impeller friction with the seal; determine the location of friction parts to eliminate the failure. (3) low head, the flow caused by large motor power does not match the characteristics of pumps; adjust the valve to reduce traffic, the motor power and pump to match. (4) Pumping a larger density or higher viscosity; Check the water quality changes, changing the working conditions of the pump (5) Bearing damage; Replace the bearings at both ends of the motor (iv), Submersible pump insulation resistance is low The main reason and treatment: ( 1) When the power cord is installed, the tip is immersed in the water or the power cord, and the signal line is damaged to cause water ingress. Replace the cable or signal cable and dry the motor. (2) The mechanical seal worn or not installed in place; replace the upper and lower mechanical seal, drying the motor. (3) O-ring aging, loss of function; replace all seals, drying the motor. ㈤ submersible pump pipe, pipe or flange connections, often have obvious reasons for leakage of water and treatment: ① pipeline itself is flawed, without pressure test; ② Flange joints gasket untreated Good; ③ flange bolts are not tightened in a reasonable manner; defective tubes should be repaired or even replaced, the center of the docking tube deviation should be removed from the rearrangement, alignment bolts should be inserted in the state of freedom Tightening, piping all installed, the system should be the compressive strength and leakage test. Must be replaced by new ones. ㈥ submersible pump internal leakage: Submersible pump leakage occurs, resulting in insulation damage, bearing flooding, alarm system alarm, forcing the unit to stop running. The main reason: submersible pump dynamic seal (mechanical seal) or static seal (cable seal imports, 0 ring) damage caused by water seepage, power cable or signal cable damage caused by seepage. Various alarm signals such as flooding, leakage, humidity and other alarm shutdown; before installation, should check the quality of the seal components; installation must ensure that the seal member end face contact well; check the motor phase and ground before running insulation resistance and the alarm The system's sensing components are intact. When any of the above faults occur during operation, replace all damaged seals and cables and dry the motor. Do not reuse sealed seals and cables. ㈦ submersible pump downtime reversal: 1, the pump motor will reverse the pump after the power outage, the main reason is because the outlet pipe in the check valve or door failure. 2, the precautionary measures should be checked before installation, check valve installation direction should be correct, pat door center alignment, opening and closing should be flexible. Check the check valve or flaps frequently during operation, repair or replace the check valve or flapper for the damaged parts.