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Ruhrpumpen COMBITUBE Installation, Operation And Maintenance Manual

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Installation, Operation and Maintenance Manual
COMBITUBE

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Summary of Contents for Ruhrpumpen COMBITUBE

  • Page 1 Installation, Operation and Maintenance Manual COMBITUBE...
  • Page 2 Contact with hot surfaces of the pump can cause severe burns. Care must be taken where such surfaces are exposed. Care must also be taken to prevent ignition of flammable fluids or other material. Information in this manual is believed to be reliable, but it is not guaranteed by Ruhrpumpen as to its completeness or accuracy.

  • Page 3: Table Of Contents

    COMBITUBE Single Stage, High Pressure Pump INDEX 1. PRODUCT DESCRIPTION .......................... 7 1.1 INTRODUCTION ..........................7 1.2 DESIGN ............................... 8 1.3 SOLIDS HANDLING ..........................8 1.4 BEARINGS ............................8 1.5 DRIVE ..............................8 2. SAFETY ..............................9 2.1 IDENTIFICATION OF SAFETY INSTRUCTIONS IN THE OPERATING MANUAL ........9 2.2 QUALIFICATION AND TRAINING OF OPERATING PERSONNEL ............
  • Page 4 COMBITUBE Single Stage, High Pressure Pump 4.3 PRESSURE MONITORING ......................... 16 4.4 BYPASS PIPING ..........................16 4.5 ELECTRICAL CONNECTIONS ......................17 4.6 MOTOR LOAD MONITOR ......................... 18 5. TRANSPORT & STORAGE ........................19 5.1 SHIPPING ARRANGEMENTS ......................19 5.2 UNLOADING AND CHECKING EQUIPMENT ..................19 5.3 TRANSPORT .............................
  • Page 5 COMBITUBE Single Stage, High Pressure Pump 8. LUBRICATION ............................39 8.1 GREASE LUBRICATION ........................39 8.2 MAINTENANCE TIMETABLE – GREASE .................... 39 8.3 APPROVED GREASES ........................40 8.4 OIL LUBRICATION ..........................40 8.5 MAINTENANCE TIMETABLE – OIL ....................41 8.6 APPROVED OILS ..........................41 9.
  • Page 6 COMBITUBE Single Stage, High Pressure Pump 12. PARTS INFORMATION ......................... 79 13. SPARE PARTS ............................83 14. TROUBLESHOOTING CHART ........................ 85 V1.070716...

  • Page 7: Product Description

    1.1 INTRODUCTION The Combitube Pump has been developed for ‘Low Flow, High Pressure’ applications. The Pitot tube design produces a stable, pulsation free flow. The ability to operate with low minimum flow makes the pump suitable for a wide variety of applications.

  • Page 8: Design

    Single Stage, High Pressure Pump 1.2 DESIGN The Combitube pump is a single-stage, pitot-tube pump. The liquid enters the pump via the suction line, passes the mechanical seal (the mechanical seal is under suction pressure only) and enters the rotor where it is accelerated up to the rotor speed.

  • Page 9: Safety

    COMBITUBE Single Stage, High Pressure Pump 2. SAFETY This operation manual gives basic instructions that should be observed during installation, operation and maintenance of the pump. It is therefore imperative that this manual be read by the responsible personnel/operator prior to assembly and commissioning. It must always be kept available at the installation site.

  • Page 10: Qualification And Training Of Operating Personnel

    If the staff does not have the necessary knowledge, they must be trained and instructed. Training may be performed by a Ruhrpumpen representative on behalf of the plant operator. Moreover, the plant operator is to make sure that the contents of the operating manual are fully understood by the personnel.

  • Page 11: Compliance With Directives Pertaining To Pumps Operating In Potentially Explosive

    COMBITUBE Single Stage, High Pressure Pump 2.5 COMPLIANCE WITH DIRECTIVES PERTAINING TO PUMPS OPERATING IN POTENTIALLY EXPLOSIVE ATMOSPHERES • It is important to exercise caution when operating the pump under a potentially explosive atmosphere. Especially important is to keep the pump...

  • Page 12: Safety Instructions For The Use In Potentially Explosive Atmospheres

    COMBITUBE Single Stage, High Pressure Pump STOPPING PROCEDURE. Pumps and pump units that convey hazardous materials must be decontaminated before any maintenance work is performed. On completion of work all safety and protective facilities must be re-installed and made operative again.

  • Page 13: Avoidance Of Exterior Impact Effect

    Modifications may be made to the machine only after consultation with a Ruhrpumpen representative. Using spare parts and accessories authorized by Ruhrpumpen is in the interest of safety. The use of parts not authorized by the dealer exempt the manufacturer from any liability, voiding the warranty.

  • Page 14: Intended Application

    T4, the ambient temperature must not exceed 40 °C. 3.2 DESIGN AND WORKING PRINCIPLE Combitube pumps operate in the following manner: Liquid enters the intake manifold and passes into the rotating case where centrifugal force increases the velocity and pressure of the liquid. The velocity of the liquid in the rotating case or ‘rotor’...

  • Page 15: Nameplate

    The materials of construction and the mechanical seal type may be specified to suit the pumped liquid and duty. Combitube pumps are designed for long life and trouble free service. Reliable performance requires correct installation, careful monitoring and preventive maintenance, as recommended in this manual.

  • Page 16: Planning Of The Installation

    COMBITUBE Single Stage, High Pressure Pump 4. PLANNING OF THE INSTALLATION 4.1 GENERAL ADVICES  Install the pump with the suction and discharge branch in horizontal in-line position (suction branch must be in right side viewed from the coupling end.

  • Page 17: Electrical Connections

    The minimum recommended bypass flow should be approximately 10% of the peak efficiency flow of the pump. Listed below are applicable bypass orifice sizes which will meet the bypass flow requirement of the Combitube selected: Size CWHC G/O...

  • Page 18: Motor Load Monitor

    COMBITUBE Single Stage, High Pressure Pump 4.6 MOTOR LOAD MONITOR The motor load monitor monitors the electric power consumption of the driving motor. The monitor will detect inadmissible operating conditions. e.g. cavitation or flowrates outside the permissible range V1.070716...

  • Page 19: Transport & Storage

    Remove unit only by properly supporting the wooden shipping skid. After unloading, inspect the pump, check the shipment against the packing list, and report damages or shortages immediately to freight carrier and to the designated Ruhrpumpen representative. • Do not try to lift the pump or the whole unit using eyebolts place on the pump.

  • Page 20: Storing

    COMBITUBE Single Stage, High Pressure Pump • When transporting with a crane, the rope should be slung round the eye bolt as shown below in Figure 5.1 to handle the bare shaft pump only. • The rope should not be slung around the lugs attached to the motor or around the lugs attached to the pump.
  • Page 21 When the pump is to be installed, remove all the protective coatings and desiccant and drain all lubricant. One month before installation, a Ruhrpumpen representative should be employed to conduct a final inspection. To properly store the motor (driver) for periods longer than one month, follow the manufacturer’s instructions.
  • Page 22 COMBITUBE Single Stage, High Pressure Pump Store the motor in a clean, dry area, or cover it with a loose tarp (the tarp must be loose in order to prevent condensation). Exercise precautions to avoid transit or nesting of rodents, snakes, birds, and insects.

  • Page 23: Conservation

    COMBITUBE Single Stage, High Pressure Pump • Be careful not to overheat, since keeping the temperature of the motor frame 9 °F (5 °C) above the surrounding ambient temperature is sufficient. After the storing period, follow the next steps as start-up preparations: Motor should be thoroughly inspected and cleaned to restore to an “As Shipped”...

  • Page 24: Mounting Of The Pump

    COMBITUBE Single Stage, High Pressure Pump 6. MOUNTING OF THE PUMP 6.1 GENERAL ADVICES • The foundation of the pump must be leveled and have a minimum of vibration. It is recommended to use a baseplate. • Concerning the pipework, the pump must not be considered as a fixpoint.

  • Page 25: Prerequisites

    (2”) wider and longer than the pump baseplate, and should be steel reinforced according to local building codes. Correct and orderly installation/assembly is necessary for trouble-free operation of the unit. Ruhrpumpen does not assume any liability for damage resulting from inadequate installation/assembly. V1.070716...

  • Page 26: Concrete Foundation Preparation

    COMBITUBE Single Stage, High Pressure Pump The chosen location for installation must offer enough space for maintenance activities. 6.3.1 Concrete Foundation Preparation Choose a solid ground location for foundation; check that the bearing capacity of the soil is at least one third higher than both static and dynamic loads together.

  • Page 27: Placing The Pump Set

    COMBITUBE Single Stage, High Pressure Pump are recommended); they should be long enough to allow a minimum of two threads above the nuts. Provide pipe enclosures for the bolts, which are three or four diameters larger than the bolts. Protect area around the bolts from contact with the concrete.
  • Page 28 When baseplate is level, 'snug' the foundation bolt nuts, but do not tighten completely. • It is important to install Combitube pumps BEFORE installing the suction and delivery pipework. This is to ensure that the pipes are positioned to match the pump location and do not transmit load and induce strain in the pump manifold and casing.

  • Page 29: Grouting

    COMBITUBE Single Stage, High Pressure Pump alignment within acceptable figures. 6.5 GROUTING* 6.5.1 Equipment/Material Required  Grout Mix: Non Shrink Type  Sufficient lumber for foundation template and grout trough.  Risers or funnels for guiding grout.  Sufficient oil paint for grout protective covering.
  • Page 30 COMBITUBE Single Stage, High Pressure Pump • Apply three coats of paste wax to the inside surfaces of the forms in order to prevent adherence. Do not use oil or liquid wax. • Prevent grout leakage, as leaks will not self-seal.

  • Page 31: Direct Drive Coupling Alignment

    Do not use grout to fill the jackscrew’s holes; use a sealant material instead. Tighten the foundation bolts with an appropriate torque value. In case of doubt, please contact your Ruhrpumpen representative. Apply oil paint to exposed grout to protect from air and moisture.
  • Page 32 COMBITUBE Single Stage, High Pressure Pump a) Lateral alignment Figure 6.1 Lateral alignment illustration. Mount a dial gauge on the motor shaft or coupling with the gauge running on the outer machined diameter of the pump coupling. Turn the motor shaft and note the total indicator reading.
  • Page 33 The motor must be shimmed and re-positioned to align the shafts within the coupling manufacturer's specifications. The dimensions and tolerances listed below (in thousandths of an inch) apply only to the couplings supplied by Ruhrpumpen. Gap between coupling Minimum .0016...

  • Page 34: Seal Drain

    In the event of seal failure, the leakage will exit from the seal drain. Piping may be connected to the seal drain and piped away from the unit but it should never be plugged. If pumping other than water please consult Ruhrpumpen. Leakage should be monitored for identification of seal failure. 6.8 SEAL FLUSH Unless the pump was equipped for seal flush, the seal flush inlet should remain plugged.

  • Page 35: Piping

    COMBITUBE Single Stage, High Pressure Pump 7. PIPING • These units are furnished for a specific service condition. Any change in the hydraulic system may affect the pump performance adversely. • The connection of the piping must be carried out with utmost care; otherwise, the pumping fluid can escape during operation, which can seriously endanger the operating personnel.

  • Page 36: Piping The System

    COMBITUBE Single Stage, High Pressure Pump imposed on the pump casing, prevent excessive nozzle loads, maintain pump/driver alignment, and avoid pipe-induced vibration. 7.1 PIPING THE SYSTEM Check whether the piping is loosely laid, so that no strain is placed on the pump.
  • Page 37 COMBITUBE Single Stage, High Pressure Pump Figure 7.1 Cone Type Strainer Illustration. Disconnect the piping from the pump if you heat one side of the pipe to align the pipe to the pump. Pump and pipe flanges must be parallel; they should mate together without effort, and with the bolt holes properly in line.
  • Page 38 COMBITUBE Single Stage, High Pressure Pump • No obstruction within at least five (5) pipe diameters of the suction flange should be fitted • Do not install unsupported piping on the pump. • Make sure electrical connections do not impose any stress on the pump unit •...

  • Page 39: Lubrication

    • Do not use any grease that is not listed unless it is approved by Ruhrpumpen. Failure to comply may invalidate the pump warranty.

  • Page 40: Approved Greases

    The bearing bracket must be filled with oil before operation, as the pump is shipped without oil. • Do not use any oil that is not listed unless it is approved by Ruhrpumpen. Failure to comply may invalidate the pump warranty.

  • Page 41: Maintenance Timetable - Oil

    COMBITUBE Single Stage, High Pressure Pump 8.5 MAINTENANCE TIMETABLE – OIL Oil Lubricated Operating Elapsed Time Hours Pump Maintenance Whichever occurs first Check and take action as required Operating Conditions - Pressure, Flow, Seal Leakage, Vibration, Noise and Bearing Temperature.

  • Page 42: Starting And Stopping Procedures

    Single Stage, High Pressure Pump 9. STARTING AND STOPPING PROCEDURES 9.1 GENERAL ADVICES • Observe the pump operating limits documented by Ruhrpumpen (if there is any doubt, please contact Ruhrpumpen). • Safety measures should be taken at the customer's facilities to ensure (for example by means of a relief valve) that the permissible pump casing pressure is not exceeded during operation.

  • Page 43: Electrical Connection

    The rotor assembly of a Combitube has a relatively high moment of inertia, and requires an extended acceleration period before operating speed is reached. A slow-trip overload relay is recommended to prevent stalling during start-up.

  • Page 44: Checks Before First Start-Up

    COMBITUBE Single Stage, High Pressure Pump 9.3 CHECKS BEFORE FIRST START-UP  Ensure that all foundation bolts, and pump and motor fixing bolts are in place and tightened.  Are the pipelines connected and are the flange connections tight?  Is the pump including the pipework correctly primed? ...

  • Page 45: Operation

    COMBITUBE Single Stage, High Pressure Pump 9.5 OPERATION 9.5.1 Switching frequency For a start with the regulating valve closed or slightly opened and for uniform start-stop intervals, the following numbers of switching actuations apply: Maximum number of P kW frequency switches per hour <...

  • Page 46: Short-Term Shutdown

    COMBITUBE Single Stage, High Pressure Pump 9.6.1 Short-Term Shutdown If the pump has switched off correctly and has not suddenly come to a halt, it may be re-started without the need to take any special measures. If the pump comes to a sudden halt, or if the pump was switched off because of a possible danger, it must be checked for damage.

  • Page 47: Operation

    To monitor flow, pressure, temperature, and lubrication, regular visual inspection and monitoring is advisable and/or necessary during operation. Ruhrpumpen recommends checking the pump constantly at regular intervals in order to detect problems early, in case they arise. The operational check routine must include minimum the following points: •...
  • Page 48 COMBITUBE Single Stage, High Pressure Pump according to the regulations, and energized where applicable.  Check the security of all bolting, piping, and wiring.  Check all gauges, valves and instruments for proper working order.  Check all equipment for proper lubrication and correct rotation.

  • Page 49: Maintenance, Disassembly & Reassembly

    11. MAINTENANCE, DISASSEMBLY & REASSEMBLY 11.1 GENERAL ADVICES To perform the maintenance of the Combitube pump, no special (custom made) tools are needed. However, for the procedures included in this section, the use of a verticalizing device is suggested to facilitate the assembly.

  • Page 50: Maintenance & Service

    It is strongly recommended that Combitube pumps are repaired by Ruhrpumpen trained and qualified service engineers. Work must be done in clean conditions and using adequate tools will ensure safety and correct assembly.

  • Page 51: Strainer

    COMBITUBE Single Stage, High Pressure Pump 11.2.1 Strainer The filter or strainer in the suction piping should be inspected and cleaned periodically. Failure to do so could cause a restriction in the inlet flow, resulting in pump cavitation or failure of the strainer.

  • Page 52: Pitot Tube

    COMBITUBE Single Stage, High Pressure Pump require re-balancing of the rotating assembly. Excessive material removal due to erosion, corrosion, or damage may also affect the balance of the pump. The rotor and rotor cover should be inspected for signs of cavitation damage. If damage is evident, the cause should be identified and eliminated. The inner shroud of the rotor cover contains a lip that forms part of a labyrinth seal.
  • Page 53 COMBITUBE Single Stage, High Pressure Pump • Make sure to identify the order of screws of the rotor casing because it has been previously dynamically balanced. Do not forget: the rotor is balanced and therefore each screw must be placed again in its position. The holes can be marked with metal number stamps and a hammer, or with a permanent maker, in the rotor cover.

  • Page 54: Inspection And Cleaning

    Thoroughly clean all parts with kerosene or equivalent and dry all parts with compressed air or a clean, lint free cloth. Inspect all components for corrosion, erosion, pitting, and scoring. If required, replace with Ruhrpumpen O.E.M. genuine replacement parts. a. Visual check all individual parts for any damage. b. Check the bearings.
  • Page 55 It is recommended to have a verticalizing device (as the one shown in the image), to be able to change from horizontal to vertical position, as required during the assembly. The device includes a worm gear to facilitate movement. This device is sold separately, please contact Ruhrpumpen. Figure 11.2 Verticalizing device to assemble the Combitube pump.
  • Page 56 COMBITUBE Single Stage, High Pressure Pump • The fastening of the bolts must be cross wise. Place the bearing cover in the bearing bracket. Figure 11.5 Placing bearing cover in the bearing bracket. Fasten the bearing cover with its correspondent screws to the bearing bracket.
  • Page 57 COMBITUBE Single Stage, High Pressure Pump Proceed working with the rotor assembly in this position. Figure 11.7 Introducing shaft to the rotor casing. Because the rotor is balanced, the socket head caps must follow their corresponding order. Figure 11.8 Fastening of the rotor with the shaft.
  • Page 58 COMBITUBE Single Stage, High Pressure Pump Place the two lockspring washers over the casing cover. Next, insert one (1) thrust washer. For oil lubricated pumps only, insert also the deflector. Figure 11.10 Placing the lockspring washers and the thrust washer.
  • Page 59 COMBITUBE Single Stage, High Pressure Pump Introduce the bearing nut over the spacer ring and adjust. Figure 11.13 Introducing the bearing nut and adjusting. This step applies exclusively to reassemble a grease lubricated pump, as the lubricating sleeve has already been placed in oil lubricated pumps. Place the lubricating sleeve. It must rest over the radial bearing.
  • Page 60 COMBITUBE Single Stage, High Pressure Pump the shaft, not on the bearing. Figure 11.16 Introducing the thrust bearing into the lubricating sleeve. In grease lubricated pumps, we now place the sleeve-bearing subassembly directly over the spring with the thrust bearing adjusted, pre-heating the bearing first. In oil lubricated pumps, place the bearing directly over the shaft, pre-heating the bearing first.
  • Page 61 COMBITUBE Single Stage, High Pressure Pump bearing in the bearing sleeve with the help of a hydraulic press. Figure 11.19 Introducing the thrust bearing into the bearing sleeve. Pre-heat and introduce the second thrust bearing. You must wait a few seconds in the corresponding position for the bearing to contract and settle down.
  • Page 62 COMBITUBE Single Stage, High Pressure Pump number of washers required. Place a guiding stud (with ½ inch diameter and length of 18 inches) in the bearing cover to help you indicate the correct position of the rotor assembly before placing the other studs.
  • Page 63 COMBITUBE Single Stage, High Pressure Pump Place the corresponding washers on the rotor assembly holes. Figure 11.24 Place the corresponding washers on the rotor assembly holes. Fasten the corresponding nuts on the studs. Figure 11.25 Fastening the corresponding nuts on the studs.
  • Page 64 COMBITUBE Single Stage, High Pressure Pump Place the seal’s back cover in the inner part of the rotor cover. Figure 11.27 Placing the seal’s back cover. Screw the seal cover to the rotor cover. Figure 11.28 Screwing the seal cover to the rotor cover.
  • Page 65 COMBITUBE Single Stage, High Pressure Pump Now insert the Pitot tube through the rotor cover so it is placed inside the rotor. At the end, the Pitot tube must stay firmly adjusted with the manifold. We can also place the Pitot tube and rotor cover in the rotor assembly before mounting it to the casing.
  • Page 66 COMBITUBE Single Stage, High Pressure Pump dial indicator, we can verify the flatness of the rotor on its surface. Figure 11.32 Verifying the flatness of the rotor. With the same dial indicator, make sure to verify the radial run-out (misalignment) of the seal hub.
  • Page 67 COMBITUBE Single Stage, High Pressure Pump thick) to reach the value. Pick-up tube Face of casing Rotor cover Face of rotor Rotor casing Rotor casing Face of hub seat Figure 11.34 Checking height (‘B’) of rotor cover relative to casing.
  • Page 68 COMBITUBE Single Stage, High Pressure Pump Screw the casing cover to the casing with its corresponding washers and screws. Figure 11.37 Fastening the casing cover. • The fastening of the screws must be cross wise. Screw the corresponding plugs to the casing cover.
  • Page 69 COMBITUBE Single Stage, High Pressure Pump seal cover plate. Figure 11.39 Placing the O‐ring in the bore on the mechanical seal plate. Insert the static part of the mechanical seal in the seal plate bore. Figure 11.40 Inserting the static part of the mechanical seal in the seal plate bore.
  • Page 70 COMBITUBE Single Stage, High Pressure Pump compression, will depend on the seal’s brand and the machining tolerances, and it can vary between 0.354 inches (9 mm) and 0.472 inches (12 mm). The final height of the ring will be determined once the seal is assembled.
  • Page 71 COMBITUBE Single Stage, High Pressure Pump hand thread). Figure 11.44 Placing the tightening nut in its position. • Make sure of the concentricity of the seal cover (static) relative to the hub using a shim. Once centered, tighten the studs. Maximum TIR of 0.002 inches (0.050 mm).
  • Page 72 COMBITUBE Single Stage, High Pressure Pump or flanged version. Figure 11.46 Introducing the O-rings into the manifold (illustrated here in the flanged version). Introduce the protection ring into the manifold with the corresponding alignment. Figure 11.47 Introducing the protection ring into the manifold with its corresponding alignment.
  • Page 73 COMBITUBE Single Stage, High Pressure Pump Place the manifold in its position. Figure 11.49 Placing the manifold in position. Fasten and tighten the corresponding screws into their position. For this, keep the shaft of the Pitot tube up with the help of a holding device (a 5/16 by 17-inch bar, with fine thread in one end).
  • Page 74 COMBITUBE Single Stage, High Pressure Pump Screw and tighten the manifold into the casing cover. Figure 11.52 Screwing the manifold into the casing cover. • The tightening of the screws must be cross wise. Insert the corresponding O-rings into the manifold plug.
  • Page 75 COMBITUBE Single Stage, High Pressure Pump Place the corresponding washers in their position. Figure 11.55 Placing the corresponding washers in their position. Fasten the manifold plug into the manifold with its corresponding screws. Figure 11.56 Fastening the manifold plug into the manifold.
  • Page 76 COMBITUBE Single Stage, High Pressure Pump Finally, place the plastic protective cap in the axial bearing cover through the shaft. Figure 11.57 Placing the plastic protective cap. At this point, the pump has been completely assembled. Figure 11.58 Pump assembly completed.
  • Page 77 COMBITUBE Single Stage, High Pressure Pump otherwise the mechanical seal can be damaged. Please refer to SECTION 2.8.3 - Priming of the Pump. The torque values by bolt size used during the reassembly are as follows: TORQUE VALUES VDMA BOLTING SIZE...
  • Page 78 COMBITUBE Single Stage, High Pressure Pump Figure 11.59 Screw sectional drawing. V1.070716...

  • Page 79: Parts Information

    COMBITUBE Single Stage, High Pressure Pump 12. PARTS INFORMATION Combitube Grease Version Item Description Item Description Casing Bearing spacer Casing cover Bearing bracket adapter Rotor cover 551.01 Radial bearing shim 200.02 Rotor 551.02 Axial bearing shim Seal Hub Labyrinth disc...
  • Page 80 COMBITUBE Single Stage, High Pressure Pump Detail Detail mechanical seal Figure 12.1 Sectional drawing - Grease lubricated version. V1.070716...
  • Page 81 COMBITUBE Single Stage, High Pressure Pump Combitube Oil Version Item Description Item Description Casing Shaft sleeve Cover Bearing spacer Casing cover Bearing bracket adapter Rotor cover 551.01 Radial bearing shim Pump stool 551.02 Axial bearing shim 200.02 Rotor Labyrinth disc...
  • Page 82 COMBITUBE Single Stage, High Pressure Pump Detail mechanical seal Detail Figure 12.2 Sectional drawing - Oil lubricated version. V1.070716...

  • Page 83: Spare Parts

    COMBITUBE Single Stage, High Pressure Pump 13. SPARE PARTS The recommended quantities of spare parts to meet regular conditions of constant operation over a period of two years are given in the list below: Number of identical pumps (including reserve pumps)
  • Page 84 COMBITUBE Single Stage, High Pressure Pump Material Storage of spare parts  Store the spare parts in their original packaging.  Store in a dry place, preferably at a constant temperature.  Check the spare parts and the state of the packaging every 6 months for signs of corrosion.

  • Page 85: Troubleshooting Chart

    COMBITUBE Single Stage, High Pressure Pump 14. TROUBLESHOOTING CHART Combitube Troubleshooting Faults and Causes Inlet or discharge valve closed Lack of prime Obstruction in liquid passages System or discharge head too high Suction lift too high Air leak in suction line...
  • Page 86 COMBITUBE Single Stage, High Pressure Pump Combitube Troubleshooting Faults and Causes Incomplete priming Mechanical failure of critical pump components. Misalignment of pump and motor Foundation not rigid Foreign particles in rotor Erosion of rotor Improper lubrication or bearing preload Vibration...
  • Page 87 Increase the pump speed to produce greater differential pressure. CAUTION - Increased speed requires a considerable increase in power demand, refer to Ruhrpumpen for guidance. If there is no inlet obstruction, check for pipe friction losses. However, static lift may be too great. Measure with a mercury column or vacuum Suction lift too high gauge while pump is running.
  • Page 88 Recommended Action It may be possible to rate the pump to overcome this problem, refer to Air or gas in liquid Ruhrpumpen for guidance, or provide a gas separation chamber in the suction line. Head lower than rating / too The pump may be operating at a higher flow rate than suspected, throttle much liquid pumped.
  • Page 89 COMBITUBE Single Stage, High Pressure Pump Cause Recommended Action Dismantle the pump, clean and inspect all O-ring groves and O-rings, Leakage past O-rings replace parts as necessary. Discharge cavitation Reduce the discharge flow requirements, increase the discharge pressure. Adjust belt tension or replace belts as recommended in manufacturer’s Drive belts slipping instructions.
  • Page 90 COMBITUBE Single Stage, High Pressure Pump RUHRPUMPEN PLANTS USA, Tulsa & Orland MEXICO, Monterrey BRAZIL, Rio De Janeiro ARGENTINA, Buenos Aires GERMANY, Witten EGYPT, Suez INDIA, Chennai CHINA, Changzhou UK, Lancing V1.070716 V1.070716...

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