【正文】 t up to mustard or you find problem in pump39。2 mm⑶ Examine operation、vibration and leakage every day. We must solve them in time when we find problems.⑷ No operating when pumpout. When operating on that condition, pumps will vibrate violently and reduce service life.⑸ Metal body and big block, which cannot pass through pumps, must not enter pumps, neither do rubbers, plastics, and cottons, lest wet parts are damaged and stopped up so as to operate abnormally.⑹ We should check up flow and pressure of shaft seal water and cooling water and oil by examining position of valves and taking their temperature of stuff box. Higher temperature shows short of water. ⑺ Examine leakage of shaft seal water regularly. When leakage bees big we should adjust bolts of stuff cover and exchange stuff in time.⑻ Assembly of the packing① The packing length should be accord with sleeve circle, and from the direction of shaft, joints of the adjacent packing rings crossed 120176。t closes fully and slurry was put into pump.(3) Processing measurea. Clean dirt in volutes.b. Examine and replace valve and clean dirt.NO. 5(1) Appearance of faultyThe capacity of pump is not enough.(2) Analysis of reasona. Impeller、discharge pipeline、and suction pipeline are blocked up.b. Expellers are worn down.c. Rotation speed of pump is smaller than designed value.d. Installation is unreasonable. There is a leakage of air in suction pipeline.e. The resistance of pipeline is too high.f. Suction valves are opened partly.g. Pumps are unfit for working condition.(3) Processing measurea. Clean impellers and pipeline.b. Exchange impellers.c. Readjust rotation speed of pump motors.d. Remount pumps and reduce a leakage of air.e. Lower height of transport. Reduce resistance of pipeline.f. Open suction valves pletely.g. Choose pumps again.(1) Appearance of faultyMotors are overloaded.(2) Analysis of reasona. Delivery head of pump is higher than necessary head, so value of working condition moves to the larger capacity.b. Proportion of slurry is not considered when we choose motors.(3) Processing measurea. Cut down impellers. Bring down rotation speed of pump.b. Choose motor again.(1) Appearance of faultyThere is no water in pipeline. Sound in pump is abnormal.(2) Analysis of reasona. Resistance of suction pipeline is too high.b. Height of suction is too large.c. Cavitation happens.d. Air goes into suction pipeline.e. The temperature of slurry is high.(3) Processing measurea. Clean suction pipeline and inlet gate valves.b. Bring down height of suction.c. Adjust discharge valves so as that flow of pumps goes into the prescribed limit.d. Reduce the leakage of air.e. Bring down the temperature of slurry.(1) Appearance of faultyPumps vibrate violently.(2) Analysis of reasona. Cavitation happens.b. Expellers are blocked up.c. The shaft of pump and the shaft of motor are not concentric.d. Fastening parts or foundation bees flexible.(3) Processing measurea. Bring down height of installation. Lessen the resistance of suction pipeline.b. Clean the impellers.c. Readjust central line again.d. Fasten anchor nuts and reinforce ground.(1) Appearance of faultyBearings have a fever.(2) Analysis of reasona. Cooling water cocks are not opened.b. Bearings cannot be lubricated normally.c. Lubricant oil is not clean.d. The installation direction of thrust bearing is not proper.e. Quality of bearing is not up to standard.(3) Processing measurea. Turn on cooling water.b. Adjust oil level according to specification instructions.c. Clean bearings and replace lubricant oil.d. Determine installation direction of bearing according to direction of pressure.e. Change bearings.Appearance of faultya. Excessive leakage from stuffing box.b. Packing was burned down.(2) Analysis of reasona. Packing worn.b. No watersealing(3) Processing measurea. Replace new packing.b. Open the watersealing(1) Appearance of faultyOil is leaked from pump.(2) Analysis of reasona. Oil level is too high.b. Seal parts loss efficacy.c. Pumps are assembled unreasonably.(3) Processing measurea. Bring down oil level.b. Exchange seal parts.c. Reassemble pumps.(1) Appearance of faultyWater is leaked from pump head.(2) Analysis of reasona. There are questions in rubber parts.(3) Processing measurePress rubber parts or reassemble pumps.Ⅴ MAINTENANCE AND DISMOUNTING OF PUMPS In order that ZJ series pumps operate safely and play to strong points, maintenance and way of disassemble amp。 ④Start the first stage pump and gradually open the outlet valve to 1 / i (i series stage). ⑤when estimated slurry is filled with to 1 / i line, secondary pump start and gradually open the outlet valve to 2 / i。②Open shaft seal water and cooling water, adjust the pressure to the specified value。s direction of rotation must be in accordance with pump39。 when central distance is big, and we can adjust them by aligning end faces through span wire system [See Figure, (4)]. (a) (b) (c) 　 Figure 3 Capturing of coupling Figure 4 Capturing of belt wheels(3) Configuration and requirement of discharge pipeline and suction pipeline According to the applied condition and the cavitation performance of pump, the arrangement of pump can be classified into exalted setting [See Figure5, (a)] and low setting [See Figure5, ( b)].Figure 5 Arrangement of suction pipeline and discharge pipeline① Suction pipelineDiameter of suction pipeline: diameter of suction pipeline should be equal to pump inlet or larger than it so as to avoid cavitation and deposition of slurry in pipeline.Gate valve of suction pipeline: In order to maintain easily, we should install inlet gate valves whose diameter is equal to the diame