【正文】 . ② After packing, test run with supplying water, meantime, adjust gland bolts carefully to make the leakage be drop not line. Packing is very important to be pay attention to, it not only related state of seal, but also affect performances of pump.⑼ In order to make pumps operate efficiently we must adjust the interval between impeller and front liner so as that it is between mm. The interval has been adjusted before delivery. You can stop pump and adjust it if you find it isn39。⑥The rest so on, until the grout is full of the whole line running normal.(3) Notes of pumpAfter operation of pumps normally, we should examine the following Examine whether the capacity and head of pump stable and fit for requirement of work condition. ② Examine whether the electric current of motor is stable.③ Examine sound、noise and vibration in pump units is normal or not.④ The temperature rise of bearings is under 35℃, but the highest temperature of bearings is lower than 75℃.⑤ For packing seal, should open the shaft sealing water and check whether shaft sealing water quantity and water pressure are suitable, adjust the bolts on packing gland so as to adjust packing and shaft sealing water, it is better to leak out drop by drop, if packing is very tight, heating will be produced on the bearing consuming power, if packing is very loose, amount of liquid leakage will be excessive large. (4) Shutting down① Pumping clear water on pump for 30 minutes before shutting down in order to clear any slurry through pump.② Shut off discharge valves.③ Close the water of shaft seal and watercooling.④ Shut off suction valves.Attention: we must stop each stage pump at the same time when discharge valves are opened fully, lest water hammer happen and parts will be damaged.Ⅳ COMMON FAILURE AND HANDING MEASURE(1) Appearance of faultyThere is no water in pipeline when pumps operated normally. The pointers of pressure gage and vacuum meter move up and down violently.(2) Analysis of reasona. There is not enough water in suction pipeline.b. Pipeline is blocked up and suction valves are not opened pletely.c. There is a serious leakage of air in suction pipeline、apparatus、 stuffing box etc.(3) Processing measurea. We fill water into suction pipeline.b. Open suction valves and clean plugging cement in pipeline.c. Stop a leakage of air.(1) Appearance of faultyThere is no water in pipeline when pumps operate normally. The vacuum meter shows high vacuum.(2) Analysis of reasona. The suction valves are closed or stopped up.b. The resistance of pipeline is too big. Pipeline is stopped up.c. The mounting height is too high.(3) Processing measurea. Open suctions valves or clean dirt.b. We improve the suction pipeline design or clean dirt.c. We can lower mounting height.(1) Appearance of faultyThere is no water in pipeline when pumps operate normally. The pressure gages show a little pressure.(2) Analysis of reasona. The resistance of discharge pipeline is too high.b. Impellers are clogging.c. Rotation speed of pump is smaller.(3) Processing measurea. We examine and adjust discharge pipeline.b. Clean impellers.c. Improve rotation speed of pump.(1) Appearance of faultyThe pump cannot rotate normally.(2) Analysis of reasona. There are blocks in volutes.b. Outlet valve doesn39。s direction of rotation. When pump operate in opposite direction, some parts will be damaged. After pumps are divorced from motors pletely, we can regulate motor direction of rotation. When they are in the same direction, we attach pumps to motors. We must not start motor blindly.(3) Adjustment of transmissionWhen pumps are drove by elastic pin coupling, protective cover and pins should be set up carefully. When pumps are drove by belt, we adjust sliding track so as that every belt has the same pretightening force and install protective cover attentively. When pumps are drove by speed controllers, they are adjusted according to installation instructions.(4) All of fasteners must be reinforced again.(5) Put the tools and the lumbers aside to avoid accident, which was set on pump units4. Test run of pumpsPump sets can be tested run after adjustment. If possible, slurry can be transported after test run with clear water.(1) Starting of pump① Before starting of pump we must turn the impeller around in the stated direction in order that whether running is flexible.② Switch on shaft seal water. Adjust pressure up to specified value.③ Suction valves are opened pletely.④ Open waterflooding valves to pour the water into pump.⑤ Open the outlet valves and adjust the opening degree of valve gate to quarter.⑥ Start the pump units. We turn on piezometer on discharge pipeline after speed of rotation was stable. If pressure of discharge pipeline was stable, we can open discharge valves slowly up to required working conditions.Attention: When discharge valves are opened fully, starting pumps will make motor overloaded. Opening suction valves partly will bring about cavity.(2) Start series pumpSeries pump delivery line is longer, when calculation the pipeline head is consider the pipeline all full of slurry .Piping is not full of slurry pump when start it, if full open valve pipe, the head is low, the instantaneous flow rate of the pump favorite large flow, the motor overload, or cause vibration of the pump cavitation cause failure. Therefore, should press it is advisable to start the following steps:①Close the outlet valve fully open inlet valve。2 mm vertically and We assure axis of pump units by adjusting couplings when pumps are drove by couplings. There are two methods. The first method is the use of knife ruler and plug gauge. We adjust outside diameter of couplings with knife ruler to guarantee alignment in every direction and the max tolerance (δ) less than mm [See Figure3, (a)]. We examine the interval between coupling to gu