The faults often encountered in the application process of pipeline centrifugal pump are pipeline centrifugal pump can not start or start load, pipeline centrifugal pump does not discharge liquid, insufficient liquid supply, pump liquid interruption. The occurrence of these common faults will have a huge adverse impact on the use and production of pipeline centrifugal pumps. Users of pipeline centrifugal pumps must pay special attention to the common faults of pipeline centrifugal pumps.
Pipeline centrifugal pump is a centrifugal pump facility used to transport clear water or a liquid with physical and chemical properties similar to clear water. It is mainly used in industrial production, buildings, landscape fire safety and other fields. If there is a problem in the application process of pipeline centrifugal pump, it will have a great adverse impact on the working efficiency of pipeline centrifugal pump. The staff must analyze the common faults of pipeline centrifugal pump and find out the solution in time.
1. The pipeline centrifugal pump cannot be started or the starting load is large
Common fault analysis and solutions are as follows:
(1) The prime mover or switching power supply is abnormal. The solution is to check the switching power supply and prime mover condition.
(2) The pump is stuck. The solution is to check the coupling by hand, disassemble the inspection when necessary, and remove the common faults of dynamic and static parts.
(3) the packing is too tight. The solution is to loosen the filler.
2. Pipeline centrifugal pump does not discharge liquid
Common fault analysis and solutions are as follows:
(1) The filling pump is not enough (or the gas in the pump is not discharged). The solution is to fill the pump again.
(2) pump steering error. The solution is to check the direction of rotation.
(3) pump speed is too low. The solution is to check the speed and increase the speed.
3. Insufficient liquid supply of centrifugal pump
Centrifugal pump in operation, if there is no liquid supply, or the pressure of the liquid is insufficient, from the pump will be abnormal failure can not carry out normal work. Due to the failure of the centrifugal pump caused by this reason, the first thing to check from the pump casing and the inlet pipeline is full of liquid, if not filled with liquid, should be added in a timely manner to ensure that the liquid in the pump is full. Secondly, the pump speed is too low, the system head is too high or the impeller and pipeline are blocked, will directly affect the normal operation of the pump.
At this time, the maintenance personnel need to check whether the wiring of the motor is normal, whether the water head and the net pressure head of the system are normal, whether there is wear and tear, and timely replacement of damaged parts can restore the pump to normal. Impeller damage or the gap between the impeller is too large on the normal operation of the pump also have an impact, regular inspection of the impeller, timely replacement of the impeller, adjust the gap between the impeller, in order to ensure the smooth work and operation of the centrifugal pump.
In the use of centrifugal pumps, insufficient flow and substandard lift are also one of the common faults of centrifugal pumps. If there is a failure of insufficient flow of the centrifugal pump, the maintenance personnel can check whether there is a problem with the liquid height and the pressure of the system, and then reduce the production of pipelines and check valves without obstacles, replace the wear-resistant ring and impeller in time, and check whether the shaft seal is not properly closed, resulting in liquid leakage. Update and clean the damaged parts in time.
If the centrifugal pump head is not enough, it is recommended that the maintenance personnel check the impeller, liquid density, viscosity is in line with the design requirements. Appropriate to reduce the flow, improve the head of the centrifugal pump.
In view of the problem of starting the centrifugal pump, the first thing to pay attention to is to check whether the centrifugal pump is injected with water before the machine is started, whether the water injection meets the standard, and whether the water is full. If it is not the problem of water injection, the next step is to check the suction pipe, check whether there is air leakage in the suction pipe, or during operation, bubbles appear in the suction pipe, and take corresponding measures according to the actual situation. In addition, it is necessary to check the power of the centrifugal pump to see if the machine lacks power due to the low number of revolutions during operation.
In the last case, check the suction height and adjust the appropriate height to make it run normally.
4. Interruption after pumping liquid
Common fault analysis and solutions are as follows:
(1) Air leakage in suction pipeline. The solution is to check the suction side pipe joint and stuffing box sealing condition.
(2) When filling the pump, the gas on the suction side is not completely discharged. The solution is to require the pump to be filled again.
(3) The suction side is suddenly blocked by foreign matter. The solution is to stop the pump disposal of foreign matter.