AXFLOW SVM 1 (01) PDF MANUAL


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PDF Content Summary: SVM SERIES OPERATION & MAINTENANCE MANUAL Seal Less Magnetically Coupled Sliding Vane Pump IMPORTANT NOTES Read these instructions before putting the pump into service. Installation and operation should be carried out by qualified personnel only. Danger of electrocution. Electric supply must be isolated before working on the pumpset. Electrical work should only be carried out by qualified personnel SVM Series Operating & Instruction Manual Page i IMPORTANT NOTES Failure to observe the recommended procedures may result in early and severe damage to your pump and may also invalidate the guarantee. Locate the pump on a firm base close to the liquid source and not more than 1.5 – 2.0 metres above it. Mount the pump horizontally if possible. If mounted vertically, the unit must be motor downwards. Keep the inlet pipe as short and straight as possible. If self-priming is required, ensure that the inlet line is completely airtight. The bore of the inlet and discharge pipes should be at least as large as the nominal bore of the pump ports. SVM Series Operating & Instruction Manual Page ii IMPORTANT NOTES Use rigid or reinforced inlet pipe that will not deform or collapse under suction conditions. Align rigid pipes accurately with the pump ports, to ensure that the pump head is not distorted or damaged. Fit an inlet strainer of approx. 0.2 mm mesh if there is any risk of solid particles entering the pump. Use of an electrical starter is recommended. A simple switch is often inadequate for starting and stopping electric motors. APPROPRIATE STARTER WILL: prevent accidental restarts after power-failure; provide a safe, waterproof switch enclosure; protect the motor with a correctly set overload cut-cut (a fuse protects only the wiring); withstand the heavy starting current of the motor, preventing arcing and rapid contact wear. SVM Series Operating & Instruction Manual Page iii CONTENTS GENERAL ................................................................................................................................................. 1 Noise levels .......................................................................................................................................... 1 Area of operation ................................................................................................................................. 2 Spare parts ........................................................................................................................................... 2 Transport ............................................................................................................................................. 3 Storage ................................................................................................................................................ 3 Drivers ..................................................................................................................................................4 INSTALLATION........................................................................................................................................ 5 Foundations ......................................................................................................................................... 5 Close-coupled motor-pump unit without baseplate ......................................................................... 5 Motor-pump units on baseplates...................................................................................................... 5 Pump and motor alignment .................................................................................................................6 Methods of checking alignment ........................................................................................................... 7 Straight edge.................................................................................................................................... 7 Dial gauge ("clocking") ..................................................................................................................... 8 Optical methods ............................................................................................................................... 8 Location and piping .............................................................................................................................. 8 Admissible external forces and torques on pump flanges .................................................................. 11 Protecting the pump against Dry Running ......................................................................................... 12 Loss of liquid supply ....................................................................................................................... 12 Low inlet pressure .......................................................................................................................... 12 `Dead-heading'............................................................................................................................... 12 Electronic dry running protection ....................................................................................................... 12 Electrical connection .......................................................................................................................... 13 Connecting the electric motor ........................................................................................................ 13 Check direction of rotation ................................................................................................................. 14 Long-coupled pumps only .............................................................................................................. 14 Direction of rotation ....................................................................................................................... 15 OPERATION .......................................................................................................................................... 16 Supervision ........................................................................................................................................ 16 Essential running precautions ............................................................................................................ 16 Priming the pump .............................................................................................................................. 19 Pump operation ................................................................................................................................. 20 MAINTENANCE ..................................................................................................................................... 22 Supply isolation .................................................................................................................................. 22 Maintenance schedule ....................................................................................................................... 22 DISASSEMBLY ....................................................................................................................................... 23 Strong magnet essential precautions ................................................................................................. 23 Decommissioning the pump .............................................................................................................. 24 Disassembling the pump .................................................................................................................... 24 SVM Series Operating & Instruction Manual Page iv CONTENTS REASSEMBLY ........................................................................................................................................ 28 Inspection prior to reassembly ........................................................................................................... 28 Reassembling the pump ..................................................................................................................... 28 Pumping dense and/or viscous liquids ................................................................................................ 30 Reassembly of the complete pump .................................................................................................... 30 Replacing the external magnet and motor or bearing housing ........................................................... 31 Long-coupled units ......................................................................................................................... 31 Refitting the external magnet (with its bearing housing or motor) to the pump ............................ 33 Refitting the coupling (long-coupled units only) ............................................................................. 33 Typical cross-section .............................................................................................................................. 34 SVM 1 ................................................................................................................................................. 34 SVM 1.5 .............................................................................................................................................. 36 SVM 2 ................................................................................................................................................. 38 Troubleshooting..................................................................................................................................... 40 Notes .....................................................................................................................................................46 SVM Series Operating & Instruction Manual Page v GENERAL GENERAL AxFlow Aturia SVM pumps are seal less magnetically coupled sliding vane pumps. Details of the pump type and model, serial number and operating data are indicated on the pump nameplate. The pump must be installed and operated in full compliance with these instructions. The pump may not be operated outside the limits specified on the nameplate and within this manual. The pump should only be operated by skilled trained personnel. The manufacturer will not accept liability if these instructions are not followed. This manual does not take into account any specific local regulations or bylaws that may be applicable, and it is the responsibility of the installer to ensure compliance with such regulations. Noise levels The following table reports the noise level produced by AxFlow Aturia SVM-series pumps running with in their operating limits and installed according to the instructions given in this manual (average values measured in free field at 1 meter from the pump set and elaborated according to ISO standard R1680 – curve A). The values are referred to groups with AxFlow standard electric motors. For other motors the table values shall be compared to the actual used motors. MOTOR FRAME SIZE SVM Series Operating & Instruction Manual Page 1 MOTOR SPEED 4 Poles 6 Poles 63 60 58 71 60 58 80 61 59 90 62 60 100 62 60 GENERAL Area of operation AxFlow Aturia SVM pump sets may be installed within a building or externally. Wherever installed, protect the pump from frost, snow and flooding. Care must be taken to ensure that cold weather will not cause the pump or pipes to freeze, and installers may wish to consider lagging or trace heating. If supplied, standard electric motors are only suitable for operation in safe areas, free from the danger of explosive liquids or gases. Spare parts Spare parts are available from AxFlow throughout Great Britain. Please quote the pump model and serial number for all spares enquiries. SVM Series Operating & Instruction Manual Page 2 GENERAL Transport Check the nameplate on the pump against the receiving and purchase order documents to be sure that the correct size of pump and materials of construction have been supplied. If a motor has been supplied, check that the power, speed, and voltage are correct. Prior to unpacking, check for physical damage to the packing and the pump unit and notify the forwarding agent IMMEDIATELY if any damage is found. Check that the port covers are intact. If not, check whether foreign objects may have found their way into the pump casing through the ports. Remove the port covers only when you are ready to connect the pipes to the pump. When shipped, the pumps are suitable for short-term storage only. If long-term storage is necessary before the pump will be put into operation, we suggest that you contact your pump supplier for long- term storage recommendations. Check for free rotation of the pump. If the pump is close-coupled to the motor, remove the fan cover from the motor and rotate the fan by hand. To check long-coupled pumps for free rotation, remove the coupling guard and rotate the pump and motor shafts at the flexible coupling. Storage If not to be used immediately, the pumpset should be stored in a dry warm and vibration free environment. If an electric motor is supplied as the drive, then before putting into service, the motor winding insulation should be tested. If the reading is below 10 Mega ohms, move to a warm dry place for a few hours until the motor insulation value rises. Do not remove flange covers until the pump is ready to be connected to the pipework. SVM Series Operating & Instruction Manual Page 3 GENERAL Drivers AxFlow Aturia SVM pumps may be driven by an electric motor through a shaft -to-shaft coupling. There are particular points which can affect the pump: · Shaft -to-shaft flexible couplings must be properly aligned, as poor alignment will cause high loads on the pump bearings. Couplings must be suitably rated, and provide sufficient flexibility to prevent shock forces and oscillating loads from being transmitted to the pump shaft. This is particularly important for diesel engine drives. · When designing the drive system and prime mover, take into account that the pump dismantles by removing the rotating element out from the back of the pump casing. Sufficient space should be allowed to facilitate dismantling of the pump. SVM Series Operating & Instruction Manual Page 4 INSTALLATION INSTALLATION Isolate the supply before commencing work on the pump Foundations The foundation should be substantial in order to reduce vibrations, and rigid enough to prevent flexing which can result in misalignment. Foundation bolts of the correct size should be located by reference to certified drawings if the baseplate is supplied with the pump. The pump must be mounted horizontally on a level foundation, with the suction / discharge ports horizontal perpendicular to the body. Close-coupled motor-pump unit without baseplate Level the pump base accurately, using shims under the pump feet. The pump must sit firmly and evenly on its foundation. It must not be distorted by bolting to an uneven surface. Motor-pump units on baseplates Level the baseplate accurately, using shims under the base-plate next to the foundation bolts. The baseplate, if supplied, must sit firmly and evenly on its foundation: it must not be distorted by bolting to an uneven surface, which will throw the pump and motor out of alignment. SVM Series Operating & Instruction Manual Page 5 INSTALLATION Pump and motor alignment Close-coupled pumps have been aligned prior to shipment and if they turn freely by hand, no further adjustments are necessary. Long-coupled pumps have been pre-aligned with the motor prior to shipment. If pump units receive rough treatment during shipment, they can become misaligned. The flexible coupling is not designed to compensate for misalignment. Improper alignment will cause vibration and premature bearing failure. SVM Series Operating & Instruction Manual Page 6 CHECK THE ALIGNMENT OF PUMP AND MOTOR PRIOR TO START-UP INSTALLATION A final alignment check should be made after the baseplate has been grouted and set, and the foundation bolts have been tightened. COUPLING TYPE SVM Series Operating & Instruction Manual Page 7 OFFSET DISPLACEMENT ANGULARITY GAP Short flexible coupling (3000 rpm) 0.05 mm 0.04 mm per 100 mm coupling diameter Flexible spacer coupling (3000 rpm) 0.07 mm per 100 mm spacer length 0.04 mm per 100 mm coupling diameter Methods of checking alignment Straight edge Using a straight edge, check the distance from the shaft at several points on the circumference of the coupling. The distances d1 and d2 should each remain constant. IMPORTANT NOTE: The straight edge method checks static coupling alignment, not shaft alignment. It relies for its accuracy on the accurate alignment of each coupling half on its shaft. The straight edge method is a useful preliminary check, but should not be seen as an effective final alignment method. INSTALLATION Dial gauge ("clocking") There are several methods, using one or two dial gauges. The lost accurate is the reverse indicator method, using two gauges, which overcomes errors due to `sag' of the gauge bars. Optical methods Several proprietary systems are available, such as the `OPTALIGN' system (INA Linear Systems). Mechanical errors are eliminated by optical alignment techniques. On request, AxFlow can provide further information about suitable alignment methods, including allowances for THERMAL EXPANSION IN HIGH TEMPERATURE USE. Location and piping The correct pipework sizes should be selected according to the allowable limits of liquid velocity and pressure drop at the required flow rate. Check the NPSH required by the pump at its specified duty point, and ensure that the minimum NPSH available exceeds that required. This is particularly important for liquids near their boiling temperature (or bubble point). Check that the pipework is THOROUGHLY CLEAN before the pump is installed. Pipework connections must be accurately aligned with the pump ports, so that they can be connected to the pump without forcing. Maximum allowable bending moments are set out in the Table overleaf. These moments must not be exceeded, otherwise the pump may distort internally, or the pump and motor may become misaligned. Pipework must be fully and independently supported as close as practicable to the pump. Locate the pump as close as possible to the liquid source. The suction line should be as short and straight as possible, with a minimum number of bends. Bends should be large radius type: avoid sharp elbows. Bends and fittings should be no closer than 20 pipe diameters to the pump suction, to allow undisturbed flow to the pump impeller. Liquid velocity in the suction line should normally be between 0.7 and 2.0m/sec. If the liquid is near its boiling temperature (or bubble point), its velocity may need to be reduced to 0.5-1.0m/sec. If the suction line is oversized, the reducer at the pump inlet port should be ECCENTRIC, not concentric. Generally, suction piping should be one or two sizes larger than the inlet bore of the pump, to keep liquid velocity low and friction losses to a minimum. This becomes more important as the distance between the pump and the liquid supply increases. The suction line should slope so as to avoid air pockets. SVM Series Operating & Instruction Manual Page 8 INSTALLATION Valves on the suction side should be mounted with stems horizontal, or vertically downwards. All joints in the suction line must be tight, to prevent air from entering into the system, with the risk of vapour locking. If the pump is installed with a negative static inlet head (lower diagram), the foot valve/ strainer must always be immersed at a sufficient depth to avoid entry of air into the pump. Take suitable precautions to prevent vortexing in the supply vessel. A pressure gauge should be installed in the suction line, as close as possible to the pump. If the supply vessel is under vacuum, a pressure balancing line should connect the supply vessel and the pump inlet port. The discharge line should be as short and direct as possible to minimize friction losses. An air vent (if permissible) should be installed at the first high point in the discharge line. SVM Series Operating & Instruction Manual Page 9 ATTENTION ! INSTALLATION A check valve and gate valve should be installed as close as possible to the pump discharge nozzle. The check valve is installed to protect the pump from excessive back pressure or reverse flow rotation, and to prevent back flow into the pump during shut down. The discharge (gate) valve is used to regulate the flow. The check valve should be installed between the pump and the discharge valve to allow the pump to be removed from service without emptying the discharge line. A pressure gauge should be installed on the discharge side of the pump as close as possible to the discharge nozzle. If the pump is fitted with a STEAM HEATING JACKET, the steam must flow into the upper connection and out of the lower connection. The heating fluid may be water with a maximum temperature of 170oC or saturated steam with a maximum pressure of 7 bar (100psi). Prior to starting the pump it is important to flush the piping to make sure that the system is free of solids such as pipe scale, welding beads, and dirt. If possible a TEMPORARY START-UP STRAINER with a 40 mesh screen should be installed in the suction line. BE VERY CAREFUL not to allow the temporary strainer to become plugged, causing low inlet pressure with cavitation or dry running. A pressure gauge should be installed on either side of the temporary strainer to measure the pressure drop across it. If there is any risk of ingestion of solids during normal operation, once the pump has been successfully commissioned, a PERMANENT INLET STRAINER should be fitted in the inlet line. Standard AxFlow pumps are designed to handle clean liquids. Unless specifically agreed prior to purchase of the pump from your supplier, suspended solid matter must be kept out of the pump by a suitable inlet strainer. The strainer mesh size should be less than 0.5mm, with an open surface area at least 2.5 x nominal cross-sectional area of pump inlet bore. The strainer must be inspected regularly and cleaned when necessary. SVM Series Operating & Instruction Manual Page 10 AVOID PUMPING LIQUIDS CONTAINING SUSPENDED SOLIDS DO NOT PUMP LIQUIDS CONTAINING IRON OXIDES OR FERROMAGNETIC PARTICLES, HOWEVER SMALL. THESE MAY ADHERE TO THE INTERNAL MAGNET AND CAN EVENTUALLY BUILD UP INTO DAMAGING DEPOSITS. INSTALLATION Admissible external forces and torques on pump flanges z TYPE FLANGE Fx SVM Series Operating & Instruction Manual Page 11 TORQUES, Fy (daN) Fz MOMENTS, (daN.m) ΣF Mx My Mz ΣM SVM 1x... Suction 150 190 125 275 50 24 40 70 Delivery 150 190 125 275 50 24 20 70 SVM 1.5x... Suction 235 285 190 415 100 48 80 140 Delivery 235 285 190 415 100 48 80 140 SVM 2x... Suction 310 385 250 555 140 70 110 190 Delivery 310 385 250 555 140 70 110 190 x y z x y INSTALLATION Protecting the pump against Dry Running The pump must not be allowed to run dry. Dry running will result in loss of liquid film to the bearings, causing over-heating and eventual bearing failure, leading to seizure of the pump. Avoid the following conditions: Loss of liquid supply Ensure that an adequate supply of liquid is available at the pump inlet at all times. Pressure and/or flow sensors should be installed if necessary, to monitor the hydraulic conditions in the inlet pipework. Low inlet pressure Low inlet pressure due to restriction or blockage of the inlet pipework, causing liquid vaporization and cavitation in the pump, with the risk of loss of liquid film in the bearings. `Dead-heading' If the pump is permitted to run against a closed discharge for more than a short time (depending on the liquid, the duty, and the pump model and power), the liquid in the pump casing will heat up and evaporate with consequences as above. Electronic dry running protection A rapid and reliable method of stopping a centrifugal pump, in the event of loss of liquid supply or interruption of flow, is to monitor the power output of the motor. The `EL-FI' device monitors both current and phase angle, providing pump protection without pipework sensors or attachments. It is easily fitted in the power supply to the motor, in place of a normal starter. Details of power monitors are available on request from your pump supplier. SVM Series Operating & Instruction Manual Page 12 INSTALLATION Isolate the supply before commencing work on the pump Electrical connection The electrical connection to the motor should be carried out by a properly qualified electrician, using cable, cable glands and connection procedures suitable for the electrical load and for the location of the installation. All regulations governing electrical installations in HAZARDOUS AREAS must be strictly followed. It is the responsibility of the pump user to ensure that a safe electrical installation is made and maintained. Connecting the electric motor 1. Isolate the electric supply cable from the power supply. 2. Bring the cable end into the terminal box through a suitable cable gland. 3. Follow the motor manufacturer's instructions for electrical connection. These will normally be found inside the terminal box, either on a separate instruction sheet or attached to the inside of the terminal box cover. Check that the terminal links are correctly positioned for the supply voltage. Ensure that the earth connection is properly and securely made. Before replacing the terminal box lid, check that the sealing surfaces and the gasket or 0-ring seal are clean and in good condition. With flameproof electric motors, the opposing metal surfaces of the terminal box seal should be lightly greased to keep out condensation and prevent corrosion. A proper electrical starter must be used. A starter will: a. prevent accidental restarts after power failure b. provide a safe, waterproof switch enclosure (IP55 `hose-protected' specification) c. protect the motor with a correctly set thermal overload cut-out: a fuse protects only the wiring d. withstand the heavy starting current of the motor, preventing arcing and rapid contact wear. SVM Series Operating & Instruction Manual Page 13 INSTALLATION Check direction of rotation WARNING! “DO NOT RUN THE PUMP DRY” Long-coupled pumps only Prior to starting the pump the bearing housing should be filled with one of the following oils: Use ISO VG-46 viscosity oil for bearing temperature from 0° to 70°C. Use ISO VG-68 viscosity oil for bearing temperature 70° to 90°C. OIL QUANTITY : BEARING BRACKET SIZE 24 0.4 lt. Fill to the middle of the sight glass, using the following procedure: i. pour oil into the bearing housing, through the filler cap on top of it, until oil is just visible at the bottom of the sight glass. ii. tip back the transparent bulb of the constant level oiler (if mounted), and fill it with oil. iii. allow the bulb to return to its normal position. Wait for the oil to flow into the bearing housing. iv. repeat the operation until oil no longer flows out of the bulb. If there is a toothed spacer coupling between the pump and the motor, check whether it needs to be filled with oil. Follow the coupling manufacturer's instructions as required. SVM Series Operating & Instruction Manual Page 14 INSTALLATION Direction of rotation AxFlow Aturia SVM series pumps rotate clockwise when viewed from in front of the pump. To confirm the direction of rotation (refer to the rotational arrow on the pump casing) use the following procedure: a. Open the suction and discharge valves, allowing the pump to fill with liquid. b. Remove the coupling guard of a long-coupled pump, or the motor fan cover of a close-coupled pump. c. `Bump' the motor by pressing the motor start and stop buttons in quick succession. If the direction of rotation is incorrect, reverse any two of the three-phase power leads to the motor. d. After confirming correct rotation, replace the coupling guard or motor fan cover. SVM Series Operating & Instruction Manual Page 15 OPERATION OPERATION Supervision When correctly installed and operated, this AxFlow pump will give many years of trouble free service. In operation, the pump should be free from vibration and run smoothly. Any changes to smoothness of operation should be investigated immediately. The pump should be visually checked periodically. Essential running precautions Severe damage is liable to result from lack of lubrication to the rotor shaft and carbon cartridges. AxFlow Aturia SVM pumps are designed to handle clean liquids. The use of a 50-100 micron inlet strainer is strongly recommended. In particular, avoid pumping liquids containing iron oxides or other ferromagnetic particles, however small. If in doubt, please contact AxFlow. Restriction of the inlet is liable to cause the pump to cavitate leading to loss of efficiency and rapid wear. Restriction of the discharge - in the SVM pumps - is liable to overload the electric motor, reduced flow can be obtained, if required, by running a branch from the discharge back to the liquid source. (BY-PASS). IF THE PUMP/S TO BE SHUT DOWN FOR AN EXTENDED PERIOD, ITIS ADVISABLE TO CIRCULATE CLEAN WATER FOR SEVERAL MINUTES TO AVOID THE RISK OF INTERNAL INCRUSTATIONS OR PRECIPITATIONS. (other solvents compatible with pump material can be used). SVM Series Operating & Instruction Manual Page 16 DO NOT RUN THE PUMP DRY! AVOID PUMPING LIQUIDS CONTAINING SUSPENDED SOLIDS! NEVER RESTRICT EITHER THE INLET OR DISCHARGE PIPE! OPERATION This protects the vanes and internal parts against dry running The motor should rotate in the direction shown, viewed from in front of pump. IMPORTANT: do not run the pump in reverse. Reverse rotation will lead to accelerated wear and eventual failure. The direction of flow may be reversed simply by rotating the pump and adaptor through 180° on the motor flange. SVM Series Operating & Instruction Manual Page 17 START THE PUMP BRIEFLY TO CHECK THE DIRECTION OF ROTATION ! FILL THE PUMP BODY WITH LIQUID BEFORE STARTING THE PUMP! OPERATION If the pump does not prime rapidly, stop the motor and check for air leaks in the inlet line. If flow is poor or non-existent, check for adequate liquid supply, correct rotation of the motor. To alter the direction of rotation of a three-phase motor changes any two connections. For a single-phase motor, reverse the polarity of the start winding in relation to the main winding. IF IN DOUBT OR DIFFICULTY, OBTAIN THE ASSISTENCE OF A QUALIFIED ELECTRICIAN SVM Series Operating & Instruction Manual Page 18 WHEN RUNNING THE PUMP, CHECK THAT PRIMING HAS TAKEN PLACE ! OPERATION Priming the pump DO NOT RUN THE PUMP DRY! Check that the liquid supply is at the correct temperature, with any necessary heating/cooling in operation. Open the suction and discharge valves, allowing the pump to fill with liquid. NOTE: If the direction of rotation has not been checked, this must be done before proceeding (see above). 1. Open the discharge valve to 1/2 open. 2. Start the motor and immediately check the discharge pressure gauge. The pressure should rise quickly and hold steady. If the pressure rises and then falls back, there is air or vapour in the system. STOP THE PUMP IMMEDIATELY! Wait a few seconds before restarting pump 3. If the pressure gauge does not hold steady after repeating step 2 several times, shut the pump down, open the discharge vent (if permissible) and check that all vapour or air is purged from the system. 4. Once the pump is fully primed and a steady discharge pressure is established, slowly open the discharge valve until the desired operating point is reached. Check that the electric motor current does not exceed the rated full load current shown on the motor plate. 5. If the pump starts to vibrate, rattle or run noisily, the flow rate has become excessive. Close the discharge valve IMMEDIATELY until the pump runs smoothly again. Vibration and noise are an indication of cavitation, which can cause rapid and severe damage if permitted to continue. If the flow rate needs to be permanently restricted, a permanent orifice in the discharge line is more secure than an adjustable valve. Your pump supplier will advise on a suitable orifice size if necessary. SVM Series Operating & Instruction Manual Page 19 OPERATION SVM Series Operating & Instruction Manual Page 20 Pump operation Operators should make frequent visual inspections to check that the pump is running smoothly without noise or vibration, and that the discharge pressure is holding steady, without fluctuation, at the correct figure. Over-heating of the pump or motor bearings is cause for alarm. The bearing housing should not be more than 50°C above ambient temperature, nor should it exceed 80°C (too hot to touch) in any event. If the bearings over-heat, shut the pump down immediately, investigate the cause, and take corrective action. Care must be taken to make sure that the sleeve bearings in the pump are replaced in sufficient time to prevent mechanical rubbing between the inner magnet and the rear casing of the pump. This condition can be detected by an increase in power consumption and loss of pump performance. In addition the pump may vibrate or operate noisily. IF LEFT UNATTENDED, THE RUBBING WILL EVENTUALLY BREAK THE REAR CASING CAUSING LEAKAGE OF THE LIQUID INTO THE ENVIRONMENT Be sure to maintain properly the ball bearings supporting the outer magnet in the external bearing housing (or the motor bearings in the case of close-coupled pumps). BEARING FAILURE WILL RESULT IN THE OUTER MAGNET MECHANICALLY RUBBING ON THE OUTSIDE OF THE REAR CASING, WHICH IF LEFT UNATTENDED WILL CAUSE THE REAR CASING TO FAIL, WITH LIQU ID LEAKAGE INTO THE ENVIRONMENT Follow the motor manufacturer's recommendations and keep the motor bearings maintained. ATTENTION! Never throttle the pump by closing a valve in the suction line. Throttling the suction line can cause serious damage to the pump. ATTENTION! Do not allow the pump to run against a closed discharge valve for more than a few seconds. This will cause rapid heating of the liquid in the pump casing, with vaporization and dry running of the bearings, risking serious damage to the pump. OPERATION Vibration monitoring in service can detect poor hydraulic conditions, bearing wear, internal erosion or chemical attack before it seriously damages the pump. Vibration may be monitored on the internal pump bearings and/or the external bearing housing and/or the motor bearings. Your supplier will advise you on vibration monitoring on request. If a temperature sensor is fitted to the pump, check regularly to ensure that it is working properly. IMPORTANT SAFETY NOTE When the pump is stopped, unless a non-return valve is fitted in the discharge line, liquid will drain back through the pump, causing it to rotate in reverse. Do not start the pump while it is turning backwards, as this can result in immediate and severe damage. Allow ample time for complete drainage of the discharge line before the pump is restarted. SVM Series Operating & Instruction Manual Page 21 MAINTENANCE MAINTENANCE In general, AxFlow Aturia SVM-series pumps do not require routine maintenance, and therefore do not need to be dismantled frequently. If the recommended procedures are observed, the pump should give lengthy and trouble-free service. Worn graphite vanes and stator components may ultimately need to be replaced. Follow carefully the instructions for dismantling and re-assembling the pump, or return to AxFlow for overhaul. Isolate the supply before commencing work on the pump Supply isolation For pumps driven by electric motor, always isolate the supply before working on the pump. Affix a notice on the electrical isolator to inform others that the work is being carried out on the installation. If possible lock closed the supply isolator. Maintenance schedule Provided the pumped liquid is clean and free of suspended solids, and the pump is operated within the manufacturer's stated performance limits and is not allowed to run dry, your AxFlow Aturia pump is capable of running for very long periods with minimal attention. Please see previous PUMP OPERATION section. PARTS TO BE INSPECTED ACTION TO BE TAKEN FREQUENCY External bearing housing Fill with appropriate oil to the Weekly. (long coupled units) middle of the sight glass Change the oil every 5000 hours Internal carbon cartridge SVM Series Operating & Instruction Manual Page 22 After 2500 hours of operation, check for premature wear. Thereafter, check every 5000 hours or once a year, whichever is shorter. Motor bearings Check vanes, stator, front flange and rear flange for wear. On reassembly use new gaskets and O-rings Unless otherwise specifically stated in the pump instructions, motor bearings are grease-filled and sealed for life. We recommend regular checks on motor bearing condition, and replacement when necessary. Check motor manufacturer manuals or require it if not provided. DISASSEMBLY SVM Series Operating & Instruction Manual Page 23 DISASSEMBLY Strong magnet essential precautions MAGNETS CAN PRODUCE STRONG MECHNICAL FORCES ! THERE IS A DANGER OF INJURY WHEN TWO MAGNETS ARE BROUGHT TOGETHER BY HAND! MAGNETS ARE BRITTLE AND ARE EASILY DAMAGED! BREAKAGE CAN OCCUR WHEN A MAGNET IS PLACED NEAR ANOTHER MAGNET OR IRON OBJECT WITHOUT MECHANICAL GUIDANCE AND SPECIAL CARE. IF MAGNETIC PARTICLES GET INTO THE EYES, GET MEDICAL HELP IMMEDIATELY! HEART PACEMAKERS CAN BE DAMAGED! TOOLS OR OTHER IRON OBJECTS CAN BE ATTRACTED SUDDENLY! CARDS WITH MAGNETICALLY STORED INFORMATION, I.E. CREDIT CARDS, ETC., CAN BE DAMAGED! WATCHES CAN BE DAMAGED! DISASSEMBLY Decommissioning the pump Before the pump is decommissioned, it should be flushed out with clean water or another suitable liquid. Thorough flushing out will help to ensure that: 1. if the pump stands idle for an extended period, it is not damaged by precipitation or encrustation of solids. 2. the pump does not contain dangerous amounts of corrosive, toxic or otherwise hazardous liquids when dismantled. If there is any risk of FREEZING in cold weather, the pump and pipework should be drained down carefully after heating in order to prevent ice forming inside the pump casing. NOTICE !! It is the pump user's responsibility to ensure that the pump is in a safe condition before it is opened or worked on. If the pump is removed and stored, or returned to its supplier or to a third party for repair or overhaul, it must be clearly LABELLED, stating what substances or residues it may contain, warning the recipient of any possible hazard to health. SVM Series Operating & Instruction Manual Page 24 DISASSEMBLY Disassembling the pump These operations should be carried out only by skilled personnel. Damage caused by careless or improper disassembly or reassembly is excluded from the supplier's guarantee. WORK IN A CLEAN AREA! DO NOT ALLOW MAGNETIC MATERIALS TO CLING TO THE PUMP MAGNETS! DO NOT USE FORCE! NOTE! IT IS NOT ADVISABLE TO DISMANTLE THE PUMP IN-SITU: SMALL INTERNAL PARTS ARE EASILY LOST. The pump should be taken apart with the help of the labelled sectional drawing(s) supplied with it. If necessary the internal assembly of the pump can be removed from the pump casing without disturbing the pipework. If a spacer coupling is fitted between pump and motor, the pump can be dismantled without disturbing the motor. 1. Check that the pump has been fully drained and flushed out, before you start work on it. 2. Isolate the motor from its electrical supply. 3. Isolate the pump from the rest of the hydraulic system. Isolate and disconnect any jacketing or other auxiliary pipework from the pump. SVM Series Operating & Instruction Manual Page 25 DISASSEMBLY 4. Detach the motor and external magnet from the pump by removing the four bolts from the rear flange of the pump/motor adaptor. LOOSEN LOCKING SCREWS ON THE SHAFT AND EXTRACT THE EXTERNAL MAGNET BY AN EXTRACTOR TOOL. DO NOT STRIKE THE MAGNET! The magnetic elements are brittle and easily damaged. DO NOT ALLOW THE MAGNET TO FALL ON THE FLOOR! SAFETY NOTE! See STRONG MAGNET ESSENTIAL PRECAUTIONS Take care not to trap your fingers as the two halves of the magnetic coupling are separated 5. Remove four screws attaching the pump head to the motor adaptor bracket. 6. The complete pump casing can now be removed from the adaptor, together with the O-ring seal. 7. Remove the four end screws from the pump head. Remove the end cover and the front O-ring seal. SVM Series Operating & Instruction Manual Page 26 DISASSEMBLY 8. Stand the rear surface of the internal magnet on a clean flat surface and press down gently and evenly on the pump body, which will slide down to expose the front graphite disc. 9. Remove the graphite disc, exposing the internal rotating assembly. 10. If the pump is now inverted, the vanes should fall out, together with the internal locating pin. If the vanes do not fall out, they should be carefully extracted with a suitable pair of tweezers. 11. The graphite stator will now slide out of the pump body. HEAT WITH HOT WATER THE PUMP HEAD TO FACILITATE STATOR EXTRACTION To remove the rotor, together with the vane spacing pins, the internal magnet must first be detached from the rotor. The securing pin must be tapped out, with the rotor shaft held on a suitable support. 12. Slide the magnet off the rotor shaft. The rotor and vane spacing pins can now be removed from the pump body, together with the rear graphite disc. SVM Series Operating & Instruction Manual Page 27 REASSEMBLY REASSEMBLY Inspection prior to reassembly Clean all the parts carefully. Ball bearings should be washed in a clean solvent and allowed to dry, then oiled. Check all pump parts and replace worn ones. Check the clearances for pump parts and bearing frame where long coupled pumps are supplied. Reassembling the pump WORK IN A CLEAN AREA! DO NOT ALLOW MAGNETIC MATERIALS TO CLING TO THE PUMP MAGNETS NOTE! SEE PRECAUTIONS WHEN WORKING WITH STRONG MAGNETS IF LUBRICANTS OR THREADLOCKING COMPOUNDS (e.g. `LOCTITE') ARE USED ON ANY INTERNAL THREAD OR OTHER WETTED SURFACE IN THE PUMP, THEY MUST BE COMPATIBLE WITH THE PUMPED LIQUID. (If in doubt consult the manufacturer of the compound) Stand the assembly with the free end of the shaft upwards. Turn the rotor shaft by hand to check for free rotation, before reassembling the unit. 1. Place the stainless steel body of the pump, front end uppermost, on a clean flat surface. 2. Using a wire guide (see below), insert the rear graphite disc into the pump body. (The rear disc differs from the front disc in having no peripheral O-ring groove). To locate the disc correctly ensure that the port slots are aligned with the pump ports, with the liquid lubrication holes on the side corresponding to the discharge. HEAT WITH HOT WATER THE PUMP HEAD TO FACILITATE GRAPHITE INSERTION SVM Series Operating & Instruction Manual Page 28 REASSEMBLY Use a stiff wire (approx. 1 mm) guide to assist in correct alignment of the carbon stator components. Insert the wire into the locating hole near the outer edge of the rear inner flange of the stainless steel body. Then slide the rear disc into position, using the wire as a guide for the locating slot in the periphery of the disc. 3. Slide the carbon stator gently into position, using the wire guide in the same way. Do not strike or tap it, as this is likely to damage the graphite. 4. Pick up the rotor and hold it vertically, shaft downwards. Using tweezers, insert the two vane spacing pins at 90° to each other through the centre of the rotor. Ensure that the flat surfaces of the pins face each other. 5. Carefully lower the rotor assembly halfway into the graphite stator. 6. Insert the four graphite vanes into the rotor slots. The vanes should be a close sliding fit; if they are too tight abrade the sides lightly with fine emery paper (on a flat surface) until a good fit is obtained. ENSURE THAT THE CURVED EDGES OF THE VANES FACE OUTWARDS Push the rotor assembly fully home into the graphite stator. 7. Apply finger pressure to prevent rotation, remove the wire guide substitute the stainless steel locating pin. 8. Insert the front graphite disc, taking care to fit the upper end of the locating pin into the matching groove in the disc periphery. 9. Ensure that the O-ring and its seat are clean, then locate the O-ring on the graphite disc. 10. Replace the end cover, tightening the four screws uniformly. 11. Now slide the internal magnet on the rotor shaft and secure it with the expanding shaft pin. When inserting the pin, ensure that the shaft is correctly supported. (See Disassembly Section). SVM Series Operating & Instruction Manual Page 29 REASSEMBLY 12. Locate the rear pump body in the pump motor adaptor, put the rear O-ring seal in place and insert the pump head assembly, and screw it into place with four screws. 13. Attach the pump to the motor, taking care that the external magnet is correctly positioned on the motor shaft. NOTE! The drain hole in the adaptor should be at the bottom centre. Pumping dense and/or viscous liquids · The flow rate vs. total head curves quoted is based on the performance test conducted with water at ambient temperature. · If liquids of higher density or viscosity are pumped, the power taken by the electric motor will be correspondingly increased. · AxFlow Aturia SVM-series sliding vane pumps will perform satisfactorily with liquids of specific gravity up to 2.0 and viscosity up to 2000 cps. THESE VALUES ARE PURELY INDICATIVE. CONTACT AXFLOW TECHNICAL DEPARTMENT FOR ADVICE ON PARTICULAR APPLICATIONS Service kits are available for all AxFlow Aturia SVM-series sliding vane pumps, containing the complete internal rotating and static assembly together with static seal and gasket. SEE DATA SHEET AND SECTIONAL DRAWING FOR PUMP MODEL CONCERNED REPAIR OF AXFLOW ATURIA SVM-SERIES PUMPS AXFLOW OFFERS A COMPREHENSIVE REPAIR SERVICE SHOULD YOU REQUIRE IT. PLEASE CONTACT TECHNICAL DEPARTMENT FOR DETAILS SVM Series Operating & Instruction Manual Page 30 REASSEMBLY Reassembly of the complete pump A hydrostatic pressure test may now be carried out with water, to test for leaks. The standard pump is suitable for use at system pressures up to 16 bar. Test pressure must be performed at 24 bar. Replacing the external magnet and motor or bearing housing Long-coupled units Rebuild the external bearing housing if necessary: see DISASSEMBLY AND RE-ASSEMBLY OF THE EXTERNAL BEARING HOUSING (LONG-COUPLED UNITS ONLY) section. Fit the external magnet on to the external bearing shaft or the motor shaft. First, clean the bore of the drive magnet hole and the surface of the shaft with fine emery paper, and lightly oil both surfaces. SAFETY NOTE - See STRONG MAGNET ESSENTIAL PRECAUTIONS section. Fit the key into the keyway. Push the magnet onto the shaft, it should be a smooth interference fit. If necessary, use a light hydraulic press to push the magnet into position, pressing on the inside base of the magnet hub. See table below for correct positioning of the magnet on the shaft. DO NOT STRIKE THE MAGNET! The magnet elements are brittle and are easily damaged. SVM Series Operating & Instruction Manual Page 31 REASSEMBLY LOCATION OF EXTERNAL MAGNET ON MOTOR OR PEDESTAL SHAFT CLOSE COUPLED UNITS LONG COUPLED UNITS Pump SVM Motor Dimensions A A Model Frame Size P N D mm mm SVM 1x... 71 160 110 14 90 SVM 1.5x... 80 200 130 19 115 SVM 2x... 90 200 130 24 147.5 Insert key into shaft keyway and locate the outer magnet on the shaft in accordance with dimension A shown above, and tighten the grub-screw. Fill the bearing housing with oil to the middle of the sight glass. FOR LONG COUPLED PUMPS ONLY: Fill the bearing housing with oil to the middle of the sight-glass. SVM Series Operating & Instruction Manual Page 32 REASSEMBLY Refitting the external magnet (with its bearing housing or motor) to the pump SAFETY NOTE - See PRECAUTIONS Check the magnetic elements of the external magnet, and remove any loose metal particles attached to them. The magnet must be clean internally. Fit the external magnet with its attached bearing housing or motor, into the pump bracket, using three JACKING BOLTS to bring the two magnets together progressively in a controlled manner. JACKING BOLT sizes are: SVM-series pumps : M10 x 150mm Take care to avoid damaging the brittle magnetic elements inside the external magnet. When the pump is fully assembled, turn it over by hand to check for free rotation. The pump should turn over evenly, with no noise or extra resistance at any point. Refitting the coupling (long-coupled units only) Fit the two coupling halves to their shafts, checking that they run concentrically. Fit the spacer (if present). Check the coupling carefully for correct ALIGNMENT (see METHODS OF CHECKING ALIGNMENT instructions). SVM Series Operating & Instruction Manual Page 33 TYPICAL CROSS-SECTION TYPICAL CROSS-SECTION SVM 1 SVM Series Operating & Instruction Manual Page 34 TYPICAL CROSS-SECTION PART No. DESCRIPTION PART No. DESCRIPTION 1 Cover 21 Front Flange 2 Screw 22 O-Ring 3 Pump Head 23 Screw / Washer 4 Pin 24 Bolt 5 Vane 25 Bearing Cover 6 Stator 26 Screw 7 Rear Flange 27 Plug 8 Pin 28 External Magnet Bracket 9 Internal Magnet 29 Gasket 10 Bracket with Thermocouple Connection 30 Rear Ball Bearing 11 Rear Casing 31 Labyrinth Seal Ring 12 Screw 32 Bracket Shaft 13 External Magnet 33 Key 14 Rotor Shaft 34 Bearing Cover 15 Rub Ring 35 Constant Level Oil 16 Screw 36 Drain Plug 17 O-Ring 37 Key 18 Screw / Washer 38 Pedestal 19 Guide Pin 39 Screw / Washer 20 Bearing SVM Series Operating & Instruction Manual Page 35 TYPICAL CROSS-SECTION SVM 1.5 SVM Series Operating & Instruction Manual Page 36 TYPICAL CROSS-SECTION PART No. DESCRIPTION PART No. DESCRIPTION 1 Cover 21 Bearing 2 Screw 22 Front Flange 3 Pump Head 23 O-Ring 4 Pin 24 Screw / Washer 5 Vane 25 Bolt 6 Stator 26 Bearing Cover 7 Rear Flange 27 Screw 8 Screw 28 Plug 9 Internal Magnet 29 External Magnet Bracket 10 Bracket with Thermocouple Connection 30 Gasket 11 Rear Casing 31 Rear Ball Bearing 12 Screw 32 Labyrinth Seal Ring 13 External Magnet 33 Bracket Shaft 14 Rotor Shaft 34 Key 15 Key 35 Bearing Cover 16 Rub Ring 36 Constant Level Oil 17 Screw 37 Drain Plug 18 O-Ring 38 Key 19 Screw / Washer 39 Pedestal 20 Guide Pin 40 Screw / Washer SVM Series Operating & Instruction Manual Page 37 TYPICAL CROSS-SECTION SVM 2 SVM Series Operating & Instruction Manual Page 38 TYPICAL CROSS-SECTION PART No. DESCRIPTION PART No. DESCRIPTION 1 Cover 21 Screw 2 Screw 22 Screw / Washer 3 Front Flange 23 Guide Pin 4 Pump Head 24 Bearing 5 Pin 25 O-Ring 6 Vane 26 Screw / Washer 7 Stator 27 Screw / Washer 8 Rear Flange 28 Bearing Cover 9 Screw 29 Screw 10 Internal Magnet 30 Plug 11 Bracket 31 External Magnet Bracket 12 Rear Casing 32 Gasket 13 Screw 33 Rear Ball Bearing 14 External Magnet 34 Labyrinth Seal Ring 15 Rotor Shaft 35 Bracket Shaft 16 Key 36 Key 17 Rub Ring 37 Bearing Cover 18 Screw 38 Constant Level Oil 19 O-Ring 39 Drain Plug 20 Adaptor Flange with Thermocouple Connection 40 Key SVM Series Operating & Instruction Manual Page 39 TROUBLESHOOTING TROUBLESHOOTING Provided your AxFlow Aturia SVM-Series pump is correctly installed and is operated within its designed performance envelope, it is capable of running for very long periods with minimal attention. Regular inspection, and preventive maintenance when necessary, will help to prevent breakdowns. There are many possible reasons why a pump may not run properly. If your AxFlow Aturia SVM-Series pump does not run satisfactorily, be prepared to look critically at the system as well as at the pump itself. This section lists some possible pumping problems and indicates how they may be overcome. Your pump supplier will do his best to assist you further if necessary. PROBLEM PROBABLE CAUSE SOLUTION Actual total discharge head exceeds rated head of pump SVM Series Operating & Instruction Manual Page 40 · Increase speed of rotation if possible. · Reduce total head of system. · Increase discharge pipework size. · Check that discharge valve is fully open. · Replace pump: seek advice from your pump supplier. Pump rotating in reverse · Check direction of rotation. Refer to INSTALLATION section. Air or vapour trapped in inlet pipework · Check for trapped air or vapour. Refer to INSTALLATION section. Liquid contains entrained air or vapour · Check for vortexing in the inlet line. · Fit baffles in supply tank to prevent vortexing. · Fit a settling tank in the inlet line to allow entrained gas to separate from the liquid. Low inlet pressure, giving rise to cavitation and loss of efficiency · Decrease suction lift (negative head). · Increase static suction (positive head) · Check for inlet obstructions or restrictions. · Reduce liquid temperature. · Increase inlet pipework bore. · Decrease length of inlet pipework. · Open inlet valve fully. · Check for excessive liquid viscosity: increase liquid temperature if necessary. Wear on the carbon cartridges · Remove the pump and replace the worn parts with new ones. TROUBLESHOOTING PROBLEM PROBABLE CAUSE SOLUTION Liquid temperature too close to boiling · Reduce liquid temperature. Reversed ports · Rotate pump assembly 180°. Vanes sticking in the rotor SVM Series Operating & Instruction Manual Page 41 · Extract the rotor and check the inside clearances of the vanes for evidence of chemical attack or surface deposition. Excessive suction head · Decrease the suction height. · Check whether the suction pipe and foot valve has too small diameter. · Inspect the suction pipe and foot valve to see whether there are any obstructions. · Open suction valve completely Insufficient Nett Positive Suction Head · Increase NPSH available to the figure on the contract. · Check diameter of the suction pipe. · Remove any obstruction from the suction pipe. · Check temperature of the pumped liquid. Actual total discharge head exceeds rated head of pump · Increase speed of rotation if possible. · Reduce total head of system. · Increase discharge pipework size. · Check that discharge valve is fully open. · Replace pump: seek advice from your pump supplier. Pump rotating in reverse · Check direction of rotation. Refer to INSTALLATION section. Air or vapour trapped in inlet pipework · Check for trapped air or vapour. Refer to INSTALLATION section. Liquid contains entrained air or vapour · Check for vortexing in the inlet line. · Fit baffles in supply tank to prevent vortexing. · Fit a settling tank in the inlet line to allow entrained gas to separate from the liquid. TROUBLESHOOTING PROBLEM PROBABLE CAUSE SOLUTION Low inlet pressure, giving rise to cavitation and loss of efficiency SVM Series Operating & Instruction Manual Page 42 · Decrease suction lift (negative head). · Increase static suction (positive head) · Check for inlet obstructions or restrictions. · Reduce liquid temperature. · Increase inlet pipework bore. · Decrease length of inlet pipework. · Open inlet valve fully. · Check for excessive liquid viscosity: increase liquid temperature if necessary. Wear on the carbon cartridges · Remove the pump and replace the worn parts with new ones. Liquid temperature too close to boiling · Reduce liquid temperature. Pump has lost its prime · Check inlet line for air leaks. · Check for loss of liquid supply. · Re-prime pump. Refer to OPERATION section. · Check for blockage in the inlet pipework. · Check if any inlet strainers / filters are blocked. · Check for closed valves in the inlet pipework. Blocked inlet line · Reduce flow rate: partly close discharge valve. · Reduce liquid density. · Reduce rated head of pump (check first with your supplier). · Check for free rotation of pump impeller: inspect pump internally if it does not rotate freely. · Reduce motor power (check first with you pump supplier). · Use a soft start system for pump starting. Insufficient depth of immersion of the suction pipe end under the level of the liquid · Increase the depth of immersion of the suction pipe TROUBLESHOOTING PROBLEM PROBABLE CAUSE SOLUTION · Reduce discharge head: partly open discharge valve. · Reduce liquid density. · Check for free rotation of pump: inspect Magnetic drive de-coupled pump internally if it does not rotate freely. · Discharge control valve closing too quickly. · Excessive internal wear. · Reduce motor power (check first with your pump supplier). · Soft-start motor. Motor has stopped · Check power supply. · Check motor condition. EXCESSIVE FLOW SVM Series Operating & Instruction Manual Page 43 · Reduce speed of rotation if possible. Actual total discharge head is below rated head of pump · Fit smaller diameter impeller. · Partly close discharge valve to restrict flow. · Fit orifice plate in discharge line to restrict flow. Actual total discharge head is below rated head of pump · Reduce speed of rotation if possible. · Fit smaller diameter impeller. · Partly close discharge valve to restrict flow. · Fit orifice plate in discharge line to restrict flow. Vanes sticking in the rotor · Extract the rotor and check the inside clearances of the vanes for evidence of chemical attack or surface deposition. Excessive liquid density or viscosity · Reduce flow rate by reducing pump speed if possible. Pump has or is about to seize · Check pump for free rotation. · Check pump internally for obstructions. Motor and pump misaligned · Refer to INSTALLATION section. Motor bearings are failing · Replace motor bearings. · Investigate cause of overload/failure. Undersized motor · Fit a larger motor: check first with you pump supplier. Incorrectly set motor out overload cut · Check motor overload setting Electronic dry running protector has tripped · Check for loss of flow. · Check for loss of liquid supply. TROUBLESHOOTING PROBLEM PROBABLE CAUSE SOLUTION Low inlet pressure, with cavitation, loss of efficiency and loss of liquid film in the pump bearings. STOP THE PUMP IMMEDIATELY! (Mechanical damage may be occurring) SVM Series Operating & Instruction Manual Page 44 · Decrease suction lift (negative head). · Increase static suction (positive head) · Check for inlet obstructions or restrictions. · Reduce liquid temperature. · Increase inlet pipework bore. · Decrease length of inlet pipework. · Open inlet valve fully. · Check for excessive liquid viscosity: increase liquid temperature if necessary. · Check carbon cartridges and replace if worn. · Reduce liquid temperature Worn, eroded, fouled or damaged internal parts · Check pump internally for wear, damage or obstruction. Motor and pump misaligned · Refer to INSTALLATION section. Coupling worn · Replace coupling. · Check alignment of motor and pump. Worn external pump bearings · Check bearings and replace if necessary Worn motor bearings · Check bearings and replace if necessary Pump feet, motor feet or baseplate not firmly secured · Check for ‘soft-foot’. Refer to PUMP FOUNDATION section. Misaligned or badly secured pipework · Check pipework alignment and support. Refer to LOCATION AND PIPING section. Pump starting while rotating in reverse · Stop pump immediately and allow discharge line to drain completely before re-starting. TROUBLESHOOTING PROBLEM PROBABLE CAUSE SOLUTION Low inlet pressure, with cavitation, loss of efficiency and loss of liquid film in the pump bearings. STOP THE PUMP IMMEDIATELY! (Mechanical damage may be occurring) SVM Series Operating & Instruction Manual Page 45 · Decrease suction lift (negative head). · Increase static suction (positive head) · Check for inlet obstructions or restrictions. · Reduce liquid temperature. · Increase inlet pipework bore. · Decrease length of inlet pipework. · Open inlet valve fully. · Check for excessive liquid viscosity: increase liquid temperature if necessary. · Check carbon cartridges and replace if worn. · Reduce liquid temperature. Worn, eroded, fouled or damaged internal parts · Check pump internally for wear, damage or obstruction. Motor and pump misaligned · Refer to INSTALLATION section. Coupling worn · Replace coupling. · Check alignment of motor and pump. Worn external pump bearings · Check bearings and replace if necessary Worn motor bearings · Check bearings and replace if necessary Pump feet, motor feet or baseplate not firmly secured · Check for ‘soft-foot’. Refer to PUMP FOUNDATION section. Misaligned or badly secured pipework · Check pipework alignment and support. Refer to LOCATION AND PIPING section. Lack of oil in bearing housing · Check oil level: refill oil if necessary. · Replace bearings if necessary. Incorrect oil in bearing housing · Drain and replace oil if necessary. · Replace bearings if necessary. Excessive temperature of pumped liquid · Refill bearing housing with correct oil for working temperature of the pump. NOTES NOTES SVM Series Operating & Instruction Manual Page 46 SVM Series Operating & Instruction Manual Page 47 ”fluidity.nonstop” is our promise and our commitment to a level of service and a quality of product, performance and expertise the like of which has not been seen before. We are Europe’s leading source of pumps and pump expertise for the process industry and we intend to maintain that position by working fluidly, and ceaselessly, to bring you the best. Head Office Orion Park Northfield Avenue Ealing London W13 3SJ Tel: 020 8579 2111 Email: info@axflow.co.uk Aberdeen Office Unit 3 Harlaw Centre Howe Moss Crescent Kirkhill Industrial Estate Dyce Aberdeen AB21 0GN Tel: 01224 729367 Email: infoscot@axflow.co.uk Huddersfield Office Unit 9a Fieldhouse Business Park Old Fieldhouse Lane Huddersfield West Yorkshire HD2 1FA Tel: 01484 543649 Email: service@axflow.co.uk Durham Office Unit 31 Evans Business Centre Aycliffe Business Park Newton Aycliffe County Durham DL5 6ZF Tel: 01325 327322 Email: neservice@axflow.co.uk Windsor Office Unit 5 Millside Park Crouch Lane Winkfield Windsor Berkshire SL4 4PX Tel: 01344 886633 Email: soservice@axflow.co.uk Web Site: axflow.co.uk


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