CNSME Sorts Out Common Faults And Troubleshooting Of Slurry Pumps

1. Motor heat or overcurrent 1. Model selection and design issues Inspection items: The actual flow of the pump is greater than the design flow; Troubleshooting measures: Reduce the flow of the pump (reduce the speed or replace the impeller with a smaller diameter, calculated according to the slurry pump impeller cutting theory). Inspection items: The motor power is small or the slurry density is large; Troubleshooting measures: Replace with a high-power motor. 2. Assembly, installation and use problems Inspection items: mechanical friction between the impeller and the guard plate of the slurry pump; Troubleshooting measures: adjust the gap and eliminate friction; Inspection items: bearing damage; Troubleshooting measures: replace the bearing; Inspection items: friction between the gland or water seal ring and the sleeve at the shaft seal, or the packing is pressed too tightly; Troubleshooting measures: overcome friction and adjust the tightness of the packing pressure; Inspection items: the rotating shafts of the pump, coupling and motor are not concentric; Troubleshooting measures: adjust the coaxiality of the rotating shaft of the pump and motor; Inspection items: damage to the elastic rubber pad of the coupling; Troubleshooting measures: replace the elastic pad. 2. The pump does not produce water or the output is insufficient 1. Device system problems Inspection items: air inlet at the suction pipe or pump inlet flange; Troubleshooting measures: overcome air inlet factors; Inspection items: no shaft seal water or air inlet at the shaft seal; Troubleshooting measures: add shaft seal water to overcome air inlet factors; Inspection items: the outlet valve is not closed before starting or the outlet valve of the slurry pump is opened too quickly; Troubleshooting measures: operate according to the slurry pump starting procedures; Inspection items: the suction port of the slurry pump is blocked; Troubleshooting measures: clear the blockage; Inspection items: vacuum tank leaks or The size of the vacuum tank is unreasonable; Troubleshooting measures: overcome the air intake factor or improve the size of the vacuum tank, please call Shijiazhuang Ruite Pump Industry for inquiries 2. Calculation problem of slurry pump selection Inspection items: pump head is lower than the pipeline device head; Troubleshooting measures: improve the pump head to match the pipeline; Inspection items: pipeline cavitation margin is less than the required cavitation margin of the pump; Troubleshooting measures: modify the pipeline device system to increase the pipeline cavitation margin or replace the pump with a cavitation performance that meets the pipeline requirements; Inspection items: the slurry concentration is large and the selected pump is small; Troubleshooting measures: replace Large-diameter slurry pump; III. Short life of slurry pump 1. Slurry pump selection problem Inspection items: Slurry pump head is higher than pipeline head; Troubleshooting measures: Reduce pump head to match pipeline; Inspection items: Slurry pump operates under cavitation state; Troubleshooting measures: Increase the liquid level of the feed tank to increase the cavitation margin of the pipeline system; Inspection items: The speed of the selected pump is too high or the pump is small; Troubleshooting measures: Use a low-speed high-head pump or replace a large-diameter pump; Inspection items: The single-stage head of the selected pump is too high; Troubleshooting measures: Change to a series pump ; Inspection items: The material of the slurry pump flow parts does not match the slurry characteristics; Troubleshooting measures: Replace the flow parts materials that match the slurry; 2. Slurry pump manufacturing problems Inspection items: The service life of the slurry pump flow parts varies; Troubleshooting measures: Replace the flow parts with stable quality; Inspection items: The slurry pump flow parts have local defects; Troubleshooting measures: Replace qualified flow parts; Inspection items: There are other quality problems such as cracking; Troubleshooting measures: If there is this problem, it is generally a production quality problem, and you can ask the slurry pump manufacturer for a return or replacement. 3. Problems with the use of slurry pumps Inspection items: Operation in the vacuum state; Troubleshooting measures: Stabilize the pump flow or use the pump outlet valve to stabilize the pump flow; Inspection items: Using the pump inlet valve to adjust the flow causes the pump to operate in the cavitation state; Troubleshooting measures: Open the inlet valve and use the pump outlet to adjust the flow; Inspection items: Unstable slurry concentration and particle size; Troubleshooting measures: Control stable slurry characteristics; Inspection items: Foreign matter entering the pump causes pump damage; Troubleshooting measures: Use a grille to control foreign matter from entering the pump; Inspection items: Reverse rotation to start the pump causes the impeller to fall off and damage the pump; Troubleshooting measures: Reverse rotation is strictly prohibited. 4. Slurry pump vibration and noise 1. Slurry pump selection issues Inspection items: Pump head is higher than pipeline head, causing pump evacuation; Troubleshooting measures: Adjust the pump head to match the pipeline head; Inspection items: Pump runs in cavitation state; Troubleshooting measures: Increase pipeline cavitation margin or replace pump with good cavitation performance; 2. Slurry pump installation and use issues Troubleshooting measures: The pump foundation is not firm or the pipeline installation and support are not firm; Inspection items: Reinforce and install firmly; Inspection items: Pump, coupler, motor shaft are not concentric; Troubleshooting measures: Adjust the coaxiality of the pump coupler rotating shaft to the requirements; Inspection item: Damage to the elastic pad of the coupling; Troubleshooting: Replace the elastic pad; Inspection item: The static imbalance of the impeller, coupling, and groove wheel exceeds the standard; Troubleshooting: Redo the static balance; Inspection item: Improper installation of the groove wheel; Troubleshooting: Adjust the two shafts of the pump motor to be parallel, and the groove wheel of the pump motor to be centered; Inspection item: Foreign matter blocks the impeller; Troubleshooting: Eliminate foreign matter; Inspection item: Using the pump inlet valve to adjust the flow causes pump cavitation; Troubleshooting: Open the inlet valve and use the pump outlet valve to adjust the flow; Inspection item: Bearing damage; Troubleshooting: Replace the bearing. 5. Leakage 1. Slurry pump packing seal Inspection items: No seal water or low seal water pressure; Troubleshooting measures: Add seal water to ensure seal water pressure and water volume; Inspection items: The seal water contains abrasive solid particles; Troubleshooting measures: The seal water should be clean water at room temperature; Inspection items: Packing installation is unqualified or maintenance is not timely; Troubleshooting measures: Reinstall or replace according to requirements; Inspection items: Slurry pump sleeve wear; Troubleshooting measures: Replace the sleeve; Inspection items: Slurry pump packing is too hard or too soft; Troubleshooting measures: Generally, oil-immersed asbestos packing is commonly used; 2. Slurry pump mechanical seal Inspection items: Seal box installation Not perpendicular to the center line of the pump shaft; Troubleshooting: Reinstall to the requirements; Inspection items: Flush water was not added as required; Troubleshooting: Add flush water as required to maintain water pressure; Inspection items: Mechanical seal design or structure is not suitable for slurry pump; Troubleshooting: Replace the mechanical seal that meets the operating requirements of the slurry pump; 3. Slurry pump auxiliary impeller shaft seal Inspection items: High pump inlet pressure; Troubleshooting: Generally, when using auxiliary impeller shaft seal, the pump inlet pressure should be less than 0.1 times the pump head H; Inspection items: The gap between the slurry pump impeller and the rear guard plate is too large; Troubleshooting: Adjust the pump impeller axial clearance to the requirements; Inspection items: Pump start and stop Frequent, solids precipitate into the sealing box, causing premature leakage of the sealing box; Troubleshooting measures: transport clean water before stopping to completely discharge the slurry out of the pipeline or rinse the sealing box with clean water before starting; VI. Slurry pump bearing heat and oil leakage 1. Slurry pump bearing part Inspection items: single-row tapered bearing assembly slurry pump, bearing clearance is too small; Troubleshooting measures: adjust the bearing clearance; Inspection items: improper grease addition or improper amount of grease added; Troubleshooting measures: grease-lubricated bearing assemblies should generally be added with lithium-based grease; Inspection items: pump, coupling, motor rotating shafts are not concentric; Troubleshooting measures: re-adjust the coaxiality of the pump, coupling, and motor to the requirements; Inspection items: coupling Loss of elastic pad of the device; Troubleshooting measures: Replace with new elastic pad; Inspection items: Damage to the bearing retainer of the slurry pump (generally because the quality of the slurry pump bearing does not meet the standards); Troubleshooting measures: Replace with new bearings from regular manufacturers; Inspection items: The lubricating oil is too dirty; Troubleshooting measures: Replace with clean lubricating oil; 2. Oil leakage Inspection items: Too much oil; Troubleshooting measures: Add oil according to the specified position of the oil mark; Inspection items: The return oil area is too small or blocked; Troubleshooting measures: Increase the flow area of ​​the return oil and remove the blocking factors; Inspection items: Unreasonable design or unqualified manufacturing and installation; Troubleshooting measures: Change the design structure and improve the quality of manufacturing and installation. VII. Slurry pump transmission part 1. Short life of V-belt Inspection items: The slurry pump runs at a large flow rate, exceeding the power that the V-belt can transmit; Troubleshooting measures: Adjust the pump flow rate to the flow rate specified in the contract; Inspection items: The pump motor groove wheel is not installed correctly; Troubleshooting measures: Adjust the pump motor to parallel the two shafts and align the two wheels; Inspection items: V-belt slippage; Troubleshooting measures: Tighten the V-belt until it does not slip; Inspection items: The lengths of the V-belts are uneven and vary greatly; Troubleshooting measures: Replace the length of the V-belts and use them in groups. 2. Coupling (direct drive) Inspection items: Short life of elastic rubber pads; Troubleshooting measures: Adjust the two shafts of the pump motor to be coaxial, adjust the flow rate to the contract value, and replace the new elastic rubber pads; The above content is a summary of common faults and solutions of slurry pumps for you. I hope that you can find out the faults on the spot as soon as possible when you encounter problems when using slurry pumps. If you still cannot solve the problem, please contact the slurry pump manufacturer as soon as possible.