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The reason why the sewage pump can't pump water

Time of issue:2021-07-27 11:34
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The reason why the sewage pump can't pump water

(Summary description)What are the reasons why the sewage pump cannot pump water? The following editor will give you an introduction.

1. Whether the use head of the fire pump exceeds the rated value. If the actual head exceeds the rated value of the fire pump, you need to replace the fire pump model with a suitable head.

2. There is no water diversion or insufficient water storage in the sewage pump body. Only when there is a certain amount of water in the pump body, can the air in the inlet pipe be sucked into the pump due to the centrifugal force generated by the rotating impeller when it is started, and mixed with the water in the pump to form an air-water mixture, and then Through the air-water separation chamber, the lighter air is separated from the water, drained from the water outlet of the pump, and the self-priming pump discharges water. If the water in the pump body is insufficient, so that the air cannot be separated from the air-water mixture, the water pump cannot be filled, and the self-priming pump will not discharge water.

3. The inlet and outlet valves are not opened, the inlet and outlet pipelines are blocked, and the impeller flow passage is blocked. The motor is running in the wrong direction, and the motor is out of phase. The suction pipe is leaking. The pump is not filled with liquid and there is air in the pump cavity. The inlet water supply is insufficient, the suction stroke is too high, and the bottom valve is leaking.

4. Whether the pipe is too thin when the fire pump is pushing out the pipe. If the pipeline is too thin, you only need to replace the fire pump pressure out pipeline.

5. Whether the medium is hot or volatile. If the medium is hot or volatile, it is necessary to reduce the suction stroke or install it by backflow.

6. Whether the suction height of the fire pump exceeds the rated range. If it is, you need to re-install the position of the fire pump so that the suction height is at a suitable position.

The above is the reason why the sewage pump cannot pump water, I hope you can understand.

Time of issue:2021-07-27 11:34
Views:

Information

What are the reasons why the sewage pump cannot pump water? The following editor will give you an introduction.

1. Whether the use head of the fire pump exceeds the rated value. If the actual head exceeds the rated value of the fire pump, you need to replace the fire pump model with a suitable head.

2. There is no water diversion or insufficient water storage in the sewage pump body. Only when there is a certain amount of water in the pump body, can the air in the inlet pipe be sucked into the pump due to the centrifugal force generated by the rotating impeller when it is started, and mixed with the water in the pump to form an air-water mixture, and then Through the air-water separation chamber, the lighter air is separated from the water, drained from the water outlet of the pump, and the self-priming pump discharges water. If the water in the pump body is insufficient, so that the air cannot be separated from the air-water mixture, the water pump cannot be filled, and the self-priming pump will not discharge water.

3. The inlet and outlet valves are not opened, the inlet and outlet pipelines are blocked, and the impeller flow passage is blocked. The motor is running in the wrong direction, and the motor is out of phase. The suction pipe is leaking. The pump is not filled with liquid and there is air in the pump cavity. The inlet water supply is insufficient, the suction stroke is too high, and the bottom valve is leaking.

4. Whether the pipe is too thin when the fire pump is pushing out the pipe. If the pipeline is too thin, you only need to replace the fire pump pressure out pipeline.

5. Whether the medium is hot or volatile. If the medium is hot or volatile, it is necessary to reduce the suction stroke or install it by backflow.

6. Whether the suction height of the fire pump exceeds the rated range. If it is, you need to re-install the position of the fire pump so that the suction height is at a suitable position.

The above is the reason why the sewage pump cannot pump water, I hope you can understand.

Previous: Maintenance and precautions of sewage pump

Next: Precautions when using sewage pump

Previous: Maintenance and precautions of sewage pump

Next: Precautions when using sewage pump

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Methods of maintenance and maintenance of sewage pumps

What are the maintenance and maintenance methods of the sewage pump? The following editor will introduce to you. 1. To stop using the sewage pump, first close the gate valve and pressure gauge, and then stop the motor. 2. Check whether there is any looseness in the sewage pump pipeline and joints. Turn the sewage pump by hand to see if the sewage pump is flexible. 3. Add bearing lubricating oil to the bearing body. Observe that the oil level should be at the center of the oil mark. The lubricating oil should be replaced or replenished in time. 4. Unscrew the water diversion screw plug of the sewage pump body, and fill the water diversion (or slurry). Self-priming sewage pump. 5. Close the gate valve, outlet pressure gauge and inlet vacuum gauge of the outlet pipe. 6. Jog the motor to see if the rotation direction of the motor is correct. 7. Turn on the motor. When the sewage pump is running normally, turn on the outlet pressure gauge and the inlet vacuum pump, and then gradually open the gate valve, and check the motor load at the same time. 8. Try to control the flow and lift of the sewage pump within the range indicated on the label to ensure that the sewage pump runs at a high rate point to achieve great energy-saving effects. 9. During the operation of the sewage pump, the bearing temperature should not exceed the ambient temperature of 35℃, and the high temperature should not exceed 80℃. 10. If an abnormal sound is found in the sewage pump, stop and check the cause immediately. The above is the maintenance and maintenance method of the sewage pump introduced by the editor, I hope it can be helpful to everyone.

Failure phenomenon of non-clogging sewage pump

What are the failure phenomena of the non-clogging sewage pump? The following editor will give you an introduction. 1. After running for less than two months, the impeller blades were damaged by cavitation. 2. The pump runs under the state of fully open valve. 3. The outlet pressure of the pump is 0.7-0.8kgf/cm2, the pointer frequently shakes, and there is obvious blasting sound. 4. The temperature difference between the inlet and outlet of the circulating cooling water of the condenser is 25°C, and the normal temperature difference should be 8~11°C. The above is the failure phenomenon of the non-clogging sewage pump introduced by the editor. I hope you can understand it.

Precautions for installation of sewage pump

What are the precautions for installing the sewage pump? The following editor will give you an introduction. 1. The pump should be able to remove the impeller, shaft, bearing, etc. of the pump without disassembling the inlet and outlet pipes. 2. The pump design point flow, head and efficiency are not allowed to have negative deviations, and the cavitation allowance is not allowed to have positive deviations. Pump design should consider the drop in flow head caused by wear. 3. The pump head (including the head at the closing point) is allowed to have a deviation of 5%. 4. The lift curve from the design point to the closing point should rise steadily. 5. The pump can be started when the outlet valve is closed, and the outlet valve can be opened after starting. 6. When the water output of the pump is the maximum amount of water, its working point should be near the normal characteristic curve of the pump, and should not be too much lower than its normal characteristic curve. Under small flow conditions, the water pump should be ensured to run safely and smoothly, and the vibration and noise should not exceed the standard. 7. The pump and motor should be installed on the common base provided by the bidder, and the base must have sufficient strength and rigidity to meet the needs of installation and operation. 8. When multiple pumps are operated in parallel, from the normal operating range to the smallest flow rate, the difference between the load sharing limit of each pump is within 3%. 9. It is necessary to ensure that the water pump does not cavitation under all allowable operating conditions. 10. The automatic control device of the sewage pump shall be supplied by the bidder as a complete set. The automatic control device provided by the bidder must be a mature and reliable product with excellent performance and conforming to the standard. The above is the precautions for the installation of sewage pumps introduced by the editor. I hope everyone can understand.

Common control measures for total flow of sewage pump motor

What are the common control measures for the total flow of sewage pump motors? The following editor will give you an introduction. 1. Pressure adjustment of the inlet and outlet valve oil pipes In this type of method, the sewage pump is connected in series with the inlet and outlet pipe adjustment valves. Its expected effect is as if a new pump system software is selected. The larger output pull of the pump has not been changed, but the total flow curve has a certain attenuation coefficient. 2. Bypass valve adjustment In this type of method, the gate valve and the pump are connected in series, and its expected effect is as if a new pump system software is selected. The larger output pull of the pump is changed, and the characteristics of the total flow graph are also changed. The total flow graph is more linear. Third, adjust the diameter of the centrifugal impeller This type of method does not use all external components, and the total flow characteristic curve changes with the change of diameter. The above is the common control measures for the total flow of sewage pump motors introduced by the editor. I hope you can understand them.

Causes of overload of self-priming non-clogging sewage pump

What are the reasons for the overload of the self-priming non-blocking sewage pump? The following editor will give you an introduction. 1. A motor with low power supply voltage and high power cannot start when the voltage is too low. Even after starting and running, the current will be large, which will overload the motor. The reason for the low voltage is that, in addition to the low voltage of the power grid, sometimes the cable transmission distance is too long and the cable cross-sectional area is too small, which will cause the voltage to drop, and sometimes the transformer capacity is too small, which can also cause the voltage to be low. The solution is to find out the cause, and find an electrician to solve it collaboratively. 2. The gate valve is not closed when starting. According to normal operation, the gate valve should be closed first, and then the water pump should be started. After the pump runs normally, the gate valve should be slowly opened. It is much larger, so the gate valve should be closed first or close to closing when starting to reduce the starting load of the motor. 3. The packing gland is pressed too tightly. When filling the packing, the packing gland is pressed too tightly, which will increase the friction between the packing and the pump shaft sleeve and increase the motor load, which is especially obvious in small pumps. Therefore, when filling the packing, the self-priming non-clogging sewage pump should properly adjust the pressing force of the packing gland to reduce the packing tightness. 4. The water discharge pipe of the balance room is blocked. The balance room usually has a water discharge pipe, some of which are directly open to the atmosphere, and some are connected to the suction side to communicate with the suction section. This is indispensable to reduce the back pressure of the balance plate. It cannot be blocked or blocked due to other reasons. Otherwise, the water pump cannot be started because the balance device does not work and the axial thrust cannot be balanced. The balance plate and the balance plate are directly rubbed. The motor is so loaded that it cannot be started. The above is the reason why the self-priming non-clogging sewage pump is overloaded. I hope you can understand it.

The difference between sewage pump and clean water pump

What are the differences between sewage pumps and clean water pumps? The following editor will give you an introduction. 1. The head of the sewage pump is not high. Because there are more impurities in the sewage, the clearance of the impeller is larger than the clearance of the clean water pump. The failure of the sewage pump is similar to that of a general centrifugal pump, because the sewage is pumped, and the impeller of the sewage pump wears out quickly. 2. Sewage pumps belong to the field of centrifugal pumps, and their structure and principle are the same as ordinary centrifugal pumps. The ordinary clean water pump is designed to achieve high efficiency, that is to say, the hydraulic structure parameters of the clean water pump are highly efficient. The sewage pump cannot exceed the efficiency of the clean water pump in the same period. 3. The main reason why the sewage pump and its efficiency are lower than that of the clean water pump is that its flow channel becomes wider. The value of the efficiency drop is mainly related to the width of the runner. The flow path of the sewage pump is widened to prevent clogging. The impeller of a sewage pump is simpler than that of a clean water pump. There is a serrated blade under the impeller, which can be adjusted up and down, and can shred thread and cloth. 4. The clean water pump is used to transport clean water and other liquids with similar physical and chemical properties. It is suitable for industrial and urban water supply and drainage, high-rise building pressurization water supply, fire pressurization, long-distance transportation, cold and warm water circulation, etc. The above is the difference between the sewage pump and the clean water pump, I hope everyone can understand it.

Maintenance and precautions of sewage pump

Sewage pumps are widely used and there are many types. Sewage pumps are one of them. The following editor will introduce the maintenance and precautions of sewage pumps. 1. Determine the frequency of maintenance Consult the original manufacturer’s guidelines and consider scheduling repairs. Choose a time when the system is shut down, and use common sense to develop a maintenance schedule and frequency. 2. Observation is the key Get to know the system and choose a spot to observe it while the pump is still running. Record leaks, unusual sounds, vibrations, and unusual smells. Three, pay attention to security Before performing maintenance or system inspection, make sure that the machine is shut down properly. Proper isolation is important for both electrical and hydraulic systems. Four, carry out mechanical inspection 1. Check whether the installation point is safe*; 2. Check the mechanical seal and packing; 3. Check whether the pump flange is leaking; 4. Check the joints; 5. Check and clean the filter. 5. Electrical/motor inspection 1. Check whether all terminals are tight; 2. Check the motor vents and windings for dust/dirt accumulation, and clean them according to the manufacturer's guidelines; 3. Check the starting/electrical equipment for arcing, overheating, etc.; 4. Use a megohmmeter on the winding to check for insulation failures. 6. Replace damaged seals and hoses If any hoses, seals or O-rings are worn or damaged, they should be replaced immediately. The use of temporary rubber assembly lubricants ensures a tight fit and prevents leakage or slippage. The above is the maintenance and precautions of the sewage pump introduced by the editor. I hope you can understand it.

The reason why the sewage pump can't pump water

What are the reasons why the sewage pump cannot pump water? The following editor will give you an introduction. 1. Whether the use head of the fire pump exceeds the rated value. If the actual head exceeds the rated value of the fire pump, you need to replace the fire pump model with a suitable head. 2. There is no water diversion or insufficient water storage in the sewage pump body. Only when there is a certain amount of water in the pump body, can the air in the inlet pipe be sucked into the pump due to the centrifugal force generated by the rotating impeller when it is started, and mixed with the water in the pump to form an air-water mixture, and then Through the air-water separation chamber, the lighter air is separated from the water, drained from the water outlet of the pump, and the self-priming pump discharges water. If the water in the pump body is insufficient, so that the air cannot be separated from the air-water mixture, the water pump cannot be filled, and the self-priming pump will not discharge water. 3. The inlet and outlet valves are not opened, the inlet and outlet pipelines are blocked, and the impeller flow passage is blocked. The motor is running in the wrong direction, and the motor is out of phase. The suction pipe is leaking. The pump is not filled with liquid and there is air in the pump cavity. The inlet water supply is insufficient, the suction stroke is too high, and the bottom valve is leaking. 4. Whether the pipe is too thin when the fire pump is pushing out the pipe. If the pipeline is too thin, you only need to replace the fire pump pressure out pipeline. 5. Whether the medium is hot or volatile. If the medium is hot or volatile, it is necessary to reduce the suction stroke or install it by backflow. 6. Whether the suction height of the fire pump exceeds the rated range. If it is, you need to re-install the position of the fire pump so that the suction height is at a suitable position. The above is the reason why the sewage pump cannot pump water, I hope you can understand.

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