Centrifugal pump generally prone to the following faults: First, the pump can not start or start the load causes and treatment as follows: 1, the prime mover or power is not normal. Approach: Check the power and prime mover conditions. 2, pump stuck. Approach: Hand drive coupling inspection, disintegration inspection, if necessary, to eliminate static and dynamic part of the fault. 3, packing pressed too tight. Approach: relax packing. 4, the outlet valve is not closed. Approach: Close the discharge valve, restart. 5, balance pipe is not smooth. Approach: clear the balance tube. Second, the pump does not drain the reasons and solutions are as follows: 1, insufficient pump (or pump gas is not row finished). Approach: re-irrigation pump. 2, the pump is not steering. Approach: check the direction of rotation. 3, the pump speed is too low. Approach: check speed, increase speed. 4, filter plug, the valve is not working. Approach: Check the filter to eliminate debris. 5, suction height is too high, or vacuum suction tank. Approach: reduce the suction height; check the suction tank pressure. Third, the pump after the interruption of liquid discharge and treatment methods are as follows: 1, suction pipe leakage. Approach: Check the suction side of pipe connections and stuffing box sealing. 2, when the pump gas suction side exhaust is not exhausted. Approach: Requires re-irrigation pump. 3, inhalation side suddenly blocked by foreign bodies. Approach: stop pump handling foreign body. 4, inhaled a lot of gas. Approach: Check whether the whirlpool inlet, submerged depth is too shallow. Fourth, the lack of flow reasons and treatment as follows: 1, with 2,3. Approach: take appropriate measures. 2, system static head increased. Approach: Check the liquid height and system pressure. 3, resistance loss increased. Approach: Check the pipeline and check valve and other obstacles. 4, shell and impeller wear ring wear too much. Approach: replace or repair wear ring and impeller. 5, other parts of liquid leakage. Approach: Check the shaft seal and other parts. 6, pump impeller blockage, wear, corrosion. Treatment: cleaning, inspection, exchange. Fifth, the lift is not enough reasons and solutions are as follows: 1, with two of 1,2,3,4, three of 1, four of 6. Approach: take appropriate measures. 2, impeller mounted anti (double suction pump). Approach: Check the impeller. 3, liquid density, viscosity and design conditions do not match. Solution: Check the physical properties of the liquid. 4, the operating flow is too large. Approach: reduce traffic. Sixth, the reasons for the operation of power consumption and treatment are as follows: 1, impeller and wear rings, impeller and shell friction. Approach: check and repair. 2, with five of the four. Approach: reduce traffic. 3, liquid density increased. Approach: Check the liquid density. 4, packing pressed too tight or dry friction. Approach: relax the filler, check the water seal tube. 5, bearing damage. Approach: Check repair or replacement of bearings. 6, speed is too high. Approach: Check the driver and power supply. 7, pump shaft bending. Approach: Correction of pump shaft. 8, axial force balance device failure. Approach: Check the balance hole, the return pipe is blocked. 9, poor coupling or axial clearance is too small. Approach: Check the alignment and adjust the axial clearance. Seven, the pump vibration or abnormal sound causes and solutions are as follows: 1, with three of the four, six of 5,7,9. Approach: take appropriate measures. 2, the vibration frequency is 0 ~ 40% working speed. Too large bearing clearance, loose bearings, impurities in the oil, poor oil (viscosity, temperature), blistering of the shaft due to air or process fluid, poor lubrication, bearing damage. Approach: After the inspection, take appropriate measures, such as adjusting the bearing clearance, remove impurities in the oil, replace the new oil. 3, the vibration frequency is 60% ~ 100% working speed. Bearing the same problem with 2, or seal gap is too large, Loosening ring, seal wear. Approach: Check, adjust or replace the seal. 4, the vibration frequency is 2 times the working speed. Misalignment, loose coupling, seal friction, shell deformation, bearing damage, bearing resonance, thrust bearing damage, shaft bending, poor cooperation. Approach: check, take appropriate measures to repair, adjust or replace. 5, the vibration frequency is n times the working speed. Pressure pulsations, misalignment, shell deformation, seal friction, pedestals or foundation resonances, piping, machine resonance, poor gear engagement or wear. Approach: the same 4, strengthening the foundation or pipeline. 6, the vibration frequency is very high. Shaft friction, seals, bearings, gear inaccuracies, bearing jitter, poor shrink fit and more. Approach: the same 4. Eight, the cause of the bearing fever and treatment methods are as follows: 1, bearing pad scraping research does not meet the requirements. Remedy: Repair bearing pads or replace. 2, bearing clearance is too small. Approach: readjust bearing clearance or scraping. 3, the lack of oil, poor oil quality. Approach: increase the amount of oil or replace the oil. 4, bearing assembly bad. Approach: Check the bearing assembly as required to eliminate unmet requirements. 5, cooling water circuit. Approach: check, repair. 6, bearing wear or loose. Approach: repair bearing or scrapped. If loose, tighten the bolt. 7, pump shaft bending. Approach: Correction of pump shaft. 8, oil ring deformation. Oil ring can not rotate, with no oil. Approach: update rejection oil ring. 9, poor coupling or axial clearance is too small. Approach: Check the alignment and adjust the axial clearance. Nine, the cause of the shaft seal heat and treatment are as follows: 1, packing pressed too tight or dry friction. Approach: relax the filler, check the water seal tube. 2, water seal and water seal tube dislocation. Approach: re-check alignment. 3, flushing, poor cooling. Solution: Check flushing cooling circulation tube. 4, mechanical seal failure. Approach: Check the mechanical seal. Ten, the reasons for the rotor movement and processing methods are as follows: 1, improper operation, operating conditions away from the pump design conditions. Approach: Strict operation, so that the pump is always running near the design conditions. 2, the balance is not smooth. Approach: clear the balance tube. 3, balance plate and balance plate material substandard requirements. Approach: Replace the material to meet the requirements of the balance plate and balance plate seat. 11, the causes of water hammer and the treatment as follows: 1, due to a sudden power outage, resulting in system pressure fluctuations, the emergence of negative pressure system, dissolved in the liquid bubbles to escape the gas pump or pipe. Approach: the gas row net. 2, high pressure liquid column due to a sudden power outage, the impact on the pump outlet check valve plate. Approach: The pump's unreasonable drainage system piping, pipe near the layout of the transformation. 3, the outlet pipe valve closed too fast. Approach: slowly close the valve.
