A variety of common pump troubleshooting and handling techniques

Centrifugal pump common knowledge to exclude tips Summary:

Pump troubleshooting techniques, more important To grasp the pump troubleshooting skills, you must know the working principle of the pump, pump structure and structure, and the necessary operational skills and mechanical maintenance knowledge, with this knowledge, you can under the pump is not normal The situation can quickly determine the fault.
Pump troubleshooting and handling techniques specifically:
1, the pump stuck, the method is to use hand-drive coupling inspection, disintegration inspection if necessary, eliminate static and dynamic part of the fault.
2, the pump is not liquid, insufficient pump (or pump gas is not discharged). Treatment is re-irrigation pump;
Pump turned wrong. Approach is to check the direction of rotation;
Pump speed is too low. Approach is to check the speed, increase speed;
Clogged filter, the bottom valve is not working. Approach is to check the filter to eliminate debris;
Suction height is too high, or suction sump vacuum. Approach is to reduce the suction height; check the suction tank pressure.
3, the pump after the interruption of liquid discharge, causes and treatment methods, suction pipe leakage. Approach is to check the suction side of the pipe connection and stuffing box seal situation:
Suction side of the pump gas is not discharged finish. Treatment is required to re-irrigation pump;
Suction side suddenly blocked by foreign bodies. Treatment method is to stop the pump foreign matter;
Inhale a lot of gas. Approach is to check whether the inlet whirlpool, submerged depth is too shallow.
4, lack of flow, the reasons and treatment methods, the system increased static lift. Approach is to check the liquid height and system pressure;
Resistance loss increases. Approach is to check the pipeline and check valve and other obstacles;
Housing and impeller wear ring wear too much. Approach is to replace or repair wear rings and impeller;
Other parts of leakage. Approach is to check the seal and other parts;
Pump impeller clogged, worn, corroded. Treatment is cleaning, inspection, exchange.
5, head is not enough, the reason and approach, impeller mounted anti (double suction wheel). Approach is to check the impeller; liquid density,
Viscosity and design conditions do not match. The treatment method is to check the physical properties of the liquid;
Operation flow too much. The solution is to reduce the traffic.
6 , pump vibration or abnormal sound, the reason and treatment. Vibration frequency of 0 to 40% of the working speed. Too large bearing clearance, loose bearings, impurities in the oil, bad oil (viscosity, temperature), blistering due to air or process fluid, poor lubrication, bearing damage. After the treatment is checked, take appropriate measures, such as adjusting the bearing clearance, remove impurities in the oil, replace the new oil;
Vibration frequency of 60% to 100% of the working speed, or seal gap is too large, Loosening ring, seal wear. Treatment is to check, adjust or replace the seal; vibration frequency of 2 times the working speed, misalignment, loose coupling, seal friction, deformation of the shell, bearing damage, bearing resonance, thrust bearing damage, shaft bending, poor coordination . Approach is to check and take appropriate measures to repair, adjust or replace; vibration frequency n times the working speed. Pressure pulsations, misalignment, shell deformation, seal friction, pedestal or foundation resonance, piping, machine resonance; reinforcement of foundation or piping; very high vibration frequency. Shaft friction, seals, bearings, imprecise, bearing jitter, poor shrink fit and so on.
7, the cause of the bearing fever and treatment methods, scraping the bearing pads do not meet the requirements. Approach is to repair bearing pads or replacement.
Bearing clearance is too small. Approach is to re-adjust the bearing clearance or scraping;
Lack of oil, poor oil quality. Approach is to increase the oil or replace the oil;
Poor bearing assembly. Approach is to check the bearing assembly requirements, eliminate unmet requirements;
Cooling water circuit. Approach is to check, repair;
Bearing worn or loose. Approach is to repair the bearing or scrapped.
If the pine association, compound the relevant bolts; pump shaft bending. Treatment is to correct the pump shaft;
Oil ring deformation, oil ring can not be rotated, with no oil. The treatment method is to update the oil slinger;
Poor coupling or axial clearance is too small. Approach is to check the alignment and adjust the axial clearance.
8, the shaft seal heat, the reasons and treatment packing pressed too tight or friction. Treatment is to relax the filler, check the water seal tube;
Water ring seal and water pipe misplaced. Approach is to re-check alignment;
Rinse, poor cooling. Processing method is to check flushing cooling circulation tube;
Mechanical seal is faulty. Approach is to check the mechanical seal.
9, the causes of the rotor movement and processing methods are as follows, improper operation, operating conditions away from the pump design conditions.
Approach: Strict operation, the pump is always running near the design conditions;
The balance is not smooth. Approach is to clear the balance of pipe;
Balance plate and balance plate material substandard.
Approach is to replace the material to meet the requirements of the balance plate and balance plate seat.

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