How to exclude gear pump failure

Gear pumps are generally used for engineering machinery of dirty work environment and general machine tool accuracy is not high, and hydraulic system that the pressure is not too high and the flow is large. Gear pump advantages: 1) Simple structure, good manufacture ability and low cost. 2) Compared with other same type of pumps, the structure of gear pump is compact, the size is small . 3) Self-priming performance is good. Both in high and low speeds even in the case of the manual can be reliably achieved self-absorption. 4) Speed range is large. Due to the transmission and a gear portion of the pump are substantially in balance, will not produce a large inertial force at high speed. 5) The dirt in the oil of their work is not serious and difficult to bite. Gear pump disadvantages: 1) Working pressure is low. The pressure on gear, axle and gear shaft is imbalance, the load in the radial direction is large, limiting the increase off its pressure. Gear pump is mainly used in low-voltage systems. 2) A lower volumetric efficiency. This is due to the leakage of a large end face of the gear pump. 3) Flow ripple, causing pressure pulsations, which lets pipes, valves and other pieces emerge vibration and great noise. Rotary Gear Pump Fault Causes and Remedies: The transported oil is insufficient and pressure can’t be mentioned highly: Causes: 1. The veer of electromotor is error. 2. Inhalation pipe or oil filter is stoppage. 3. Axial or radial gap is too large. 4. Caused by each of the junction leakage let air comes into it. 5. Oil viscosity is too high or the oil temperature is too high. Remedies: 1. Correct motor steering. 2. Dredge pipe, cleaning filters blocking material is removed, replaced with new oil. 3. Replace and repair the related parts. 4. Tightening the screws at each connection, to avoid leaks to prevent air mixing. 5. Oil changes should be selected according to the temperature rise. Serious noise and pressure fluctuations: Causes: 1. Part of the suction pipe and oil filter is clogged or inlet filter capacity is small. 2. Inhalation tube or shaft seal inhaled air bubbles. 3. Pump and coupling misalignment or abrasions. 4. Precision of gear itself is not high. 5. CB gear pump seal skeleton damage or seal skeleton falls off when install axle. Remedies: 1. Remove dirt, so that the suction pipe flow, or switch capacity suitable filter. 2. Add a little oil in the joints or seals, if the noise is reduced, the joints can be tightened or replaced seals, oil return pipe mouth should below the surface of the oil, and the suction pipe to have a certain distance. 3. Adjustment of concentric, excluding abrasions. 4. Replace the entire training gear. 5. Check seal, when replace if damaged to prevent inhalation of air. Pump rotation is not flexible or killed: Causes: 1. Axial gap and radial clearance is too small. 2. Poor assembly, CB-type cover, and the concentricity of the shaft is not good, the long axis of the spring fastening feet long, the quality of needle sleeve is poor. 3. Pump and motor coupling concentricity is bad. 4. Impurities is inhaled in the oil pump body. Remedies: 1. Repair related parts. 2. Reassemble according to the requirements. 3. Adjusted so that the different axes is not more than 0.2mm. 4. Prevent surrounding sand lime, iron and other objects of cooling water into the oil reservoir to keep the oil clean. Honghai Pump Co., Ltd.

General failures and treatments of centrifugal pump (IV)

General failures and treatments of centrifugal pump (IV) 1. Seal fever Causes and treatment methods are as follows: (1) Packing too tight or friction. Approach is to relax the packing, check the seal tube. (2) The seal ring and seal tube dislocation. Approach is to re-check the alignment. (3) Washing, cooling is good. Approach is to check the flush cooling circulation tubes (4) Mechanical seal failure. Approach is to check the mechanical seal. 2. Rotor runs largely Causes and treatment methods are as follows: (1) Improper operation, operating conditions away from the pump design conditions. Treatment: strict operation, the pump is always running around the design conditions. (2) The balance is not smooth. Approach is to clear the balance pipe. (3) The balance disc and seat material balance disc undesirable. Approach is to replace the material meets the requirements of balance disc and balance disc holder. 3. The water hammers Causes and treatment methods are as follows: (1) Due to a sudden power failure, causing the system pressure fluctuations, occurs vacuum exhaust system, air bubbles dissolved in the liquid or escape of the gear pump in the gas pipeline memory. Approach is the gas drained. (2) High-pressure liquid column due to the rapid intrusion of a sudden power failure, the impact at the pump outlet check valve plate. Approach is unreasonable pump exhaust system pipes, pipe fittings arranged to be transformed. (3) Close the valve outlet pipe too quick. Approach is to slowly close the valve. Honghaipump.

General failures and treatments of centrifugal pump (III)

General failures and treatments of centrifugal pump (III) 1. The pump vibration or abnormal sound Causes and treatment methods are as follows: (1) Similar with c (4), (5), (7), (9) the term f. Approach is to take appropriate measures. (2)The vibration frequency is 0 to 40% of the working speed. Excessive bearing clearance, bearing loose, there are impurities in the oil, oil (viscosity, temperature) bad, because the air or process liquid lead to the blister of the oil, poor lubrication, bearing damage. After checking approach is to take appropriate measures, such as adjusting the bearing clearance, remove impurities in the oil, replace with new oil. (3) The vibration frequency is 60% to 100% of the working speed. Bearing problems related with (2), or seal the gap is too large, loose retainer, seal wear. Approach is to check, adjust or replace the seal. (4) The vibration frequency is double of the operating speed. Misalignment, loose coupling, seal friction and casing deformation, bearing damage, supporting resonance, thrust bearing damage, shaft bending, poor co-ordination. Approach is to examine and take appropriate measures, repair, adjustment or replacement. (5) The vibration frequency is n times of the working speed. Pressure fluctuation, not the center of the housing deformation, seal friction, bearings or basic resonance line, the machine resonance, the same processing method (4), the reinforcing base, or tubing. diesel pump. (6) the vibration frequency is very high. Friction shaft, seals, bearings, no precision bearings jitter, undesirable shrinkage fit or the like. Treatment with (4). 2. Bearing fever Causes and treatment methods are as follows: (1) Bearing pads scraping undesirable. Approach is to re-repair or replacement of the bearing pads. (2) The bearing clearance is too small. Approach is to re-adjust the bearing clearance or scraping. (3) The amount of lubricating oil is lubricating, bad oil. Approach is to increase the amount of oil or change oil. (4) The bearing assembly is bad. Approach is to check the bearing assembly as requirement, the eliminate the undesirable factors. (5) Cooling water circuit. Approach is to check, repair. (6) The bearing wear or looseness. Approach is bearing repair or scrap. If relaxed, tight relevant bolts. (7) If the shaft is bent. Approach is to correct the shaft. (8) If the oil slinger is distorted, the oil slinger can’t rotate and can’t take along oil. Approach is to update the slinger. (9) Coupling on the bad or axial clearance is too small. Approach is to check the situation and adjustment of the axial clearance. Honghai Pump Co.,Ltd.

General failures and treatments of centrifugal pump (II)

General failures and treatments of centrifugal pump(II) 1. The lack of traffic Causes and treatment methods are as follows: (1) Similar with b and c. Approach is to take appropriate measures. (2) The increase of the system static lift. Approach is to check the liquid level and the system pressure. (3) Increase the resistance loss. Approach is to check the piping and check valve and other obstacles. (4) Casing and impeller wear rings wears excessively. Approach is to replace or repair the wear ring and impeller. (5) Other parts have the leakage. Approach is to check the seal and other parts. (6) Clogging of the rotary gear pumps impeller, wear, corrosion. Treatment is cleaning, inspection, replacement. 2. The lift is not enough Causes and treatment methods are as follows: (1) Similar with b in (1), (2), (3), (4), cin(1) and in (6). Approach is to take appropriate measures. (2) The impeller installed backwards (double suction wheel). Approach is to check the impeller. (3) The liquid density, viscosity inconsistent with the design conditions. Approach is to examine the physical properties of the liquid. (4) If the flow rate is too large during operation. The method of treatment is to reduce traffic. 3. The power consumption in running Causes and treatment methods are as follows: (1) The impeller and wear rings, impeller and the casing has frictions. Approach is to check and repair. (2) Similar with e (4) item. The method of treatment is to reduce traffic. (3) The liquid density increased. Approach is to check the density of the liquid. (4) If packing is too tight or there is dry friction. Approach is to relax the packing, check the seal tube. (5) The bearing damage. Approach is to check, repair or replacement of the bearings. (6) If the speed is too high. Approach is to check the driver and power supply. (7) The pump spindle is bent. Approach is to correct the pump spindle. (8) The axial force balancing device failure. Approach is to check the balance of holes, the return pipe is not clogged. (9) The coupling is adverse or axial gap is too small. Approach is to check the situation and adjustment of the axial clearance. Honghai Pump Co., Ltd.

General failures and treatments of centrifugal pump (I)

General failures and treatments of centrifugal pump (I) 1. Pump can’t be started or boot load is large Causes and treatment methods are as follows: (1) The prime mover or power is not normal. Approach is to check the power supply and the prime mover circumstances. (2) Pump stuck. Approach is dynamic coupling plate by hand to check if necessary, checking the disintegration eliminate static and dynamic part of the fault. (3) Packing too tight. Treatment is relaxing filler. (4) The discharge valve is not closed. Approach is closed discharge valve, restart. (5) The balance pipe is not smooth. Approach is to clear the balance pipe. 2. The pump does not drain Causes and treatment methods are as follows: (1) Lack of irrigation pump (or pump gas is not drained). Approach is to re-prime the pump. (2) Pump turn is not right. Approach is to check the direction of rotation. (3) The sanitary pump speed is too low. Approach is to check the speed, increase speed. (4) Filter is clogged, the bottom valve is not working. Approach is to check the filter, to eliminate debris. (5) On the suction height is too high, or a vacuum suction tank. Approach is to reduce the suction height; check the suction tank pressure. 3. Interruption after draining Causes and treatment methods are as follows: (1) The suction line leak. Approach is to check the side pipe joints and sealing situation of stuffing box. (2) The suction side of the gas is not drained when the pump is irrigating. Approach is asked to re-prime the pump. (3) The suction side suddenly is blocked by foreign body. Treatment is to stop the pump and handle foreign body. (4) Inhalation of large amounts of gas. Approach is to check whether there is a vortex inlet, submerged depth is too shallow. Honghai Pump Co., Ltd.