Grundfos NK Series Installation And Operating Instructions Manual
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Grundfos NK Series Installation And Operating Instructions Manual

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GRUNDFOS INSTRUCTIONS
NK, NKG
Installation and operating instructions

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  • Page 1 GRUNDFOS INSTRUCTIONS NK, NKG Installation and operating instructions...

  • Page 2: Table Of Contents

    Pipework measured to ensure that the pump meets the requirements of Vibration damping relevant standards. Test certificates are available from Grundfos. Expansion joints After the installation, the alignment of pump and motor must be Stuffing box piping checked again.

  • Page 3: Handling

    3.3 Handling 4. Identification Warning 4.1 Nameplate Motors from 4 kW and up are supplied with lifting eyes which must not be used for lifting the entire Type pump unit. DK-8850 Bjerringbro, Denmark NKG 200-150-200/210-170 H2 F 3 N KE O 2926 Lift the pumps by means of nylon straps and shackles.

  • Page 4: Type Key

    4.2 Type key Model B Example 1, pump design according to EN 733 32 -125 .1 /142 A1 F 1 A E S BAQE Example 2, pump design according to ISO 2858 NKG 200 -150 -200 /210-170 H2 F 3 N KE O 2926 Type range Nominal diameter of suction port (DN) Nominal diameter of discharge port (DN)
  • Page 5 Example 1, pump design according to EN 733 32 -125 .1 /142 A1 F 1 A E S BAQE Example 2, pump design according to ISO 2858 NKG 200 -150 -200 /210-170 H2 F 3 N KE O 2926 Carbon-graphite-filled P 1.4408 1.4517 1.4401...

  • Page 6: Applications

    4.2.1 Codes for shaft seals Example: 10 is BAQE The digits are only used for double shaft seal solutions. Material, stationary seat Digits Letters Description Carbon, metal-impregnated with antimony which BAQE Single mechanical shaft seal is not approved for potable water BAQV Single mechanical shaft seal B Carbon, resin-impregnated...

  • Page 7: Operating Conditions

    The minimum and maximum flow rates can be read either from Pos. Description the performance curve pages in the relevant data booklets or from a curve for a specific pump when selecting it in Grundfos 0.25 - 0.55 kW MG motors Product Center. 0.75 - 22 kW MG motors, IE2/IE3 0.75 - 450 kW MMG-H motors, IE2...

  • Page 8: Shaft Seals

    haft seals Mechanical shaft seals The operating range of the seals is described for two main applications: pumping of water or pumping of coolants. Seals with a temperature range of 0 °C and up are mainly used for pumping water, while seals for temperatures below 0 °C are mainly intended for coolants.

  • Page 9: Mechanical Installation

    The minimum height of the foundation, h , can then be calculated: 7. Mechanical installation × 1.5 7.1 Pump location pump × B × δ The pump must be sited in a well-ventilated, but frost-free concrete location. The density, δ, of concrete is usually taken as 2,200 kg/m Place the pump on the foundation, and fasten it.
  • Page 10 7.2.1 Procedure 1. Preparing the foundation 2. Levelling of the base frame 3. Preliminary alignment 4. Grouting 5. Final alignment according to section Alignment. 1: Preparing the foundation We recommend the following procedure to ensure a good foundation. Step Action Illustration Use an approved, non-shrinking concrete.
  • Page 11 3: Preliminary alignment Warning Warning Carry out alignment of the motor only, as pipe Before starting work on the pump, make sure that strain will occur if the pump is shifted. the power supply has been switched off and Carry out alignment of the motor by placing shims of different cannot be accidentally switched on again.

  • Page 12: Alignment

    7.3 Alignment 7.3.2 How to align the unit It is very important that the pump/motor alignment is carried out 7.3.1 General information correctly. Follow the procedure below. When a complete unit is supplied assembled from the factory, the The values for ∅ and S2 can be found in the following table. The coupling halves have been accurately aligned by means of foil value for S1 is 0.2 mm.
  • Page 13 Aligning the pump and motor with laser equipment Step Action Step Action Make a rough alignment of pump and motor, and Measure the distance tighten the screws in the between the white lines base frame to the on the laser units. correct torque.
  • Page 14 Step Action Step Action If the measured values Measure the distance are less than 0.1 mm, from the S unit to the the alignment is rear screw on the motor. complete. Go to step 32. The control box shows Adjust the position of that the laser units must the motor.

  • Page 15: Pipework

    0.2 mm. 7.5 Vibration damping If the coupling and motor are not supplied by Grundfos, make sure to follow the coupling manufacturer's instructions. 7.5.1 Elimination of noise and vibrations...

  • Page 16: Expansion Joints

    Figure shows an example of a metal bellows expansion joint 7.6 Expansion joints with limiting rods. Expansion joints provide these advantages: • absorption of thermal expansion and contraction of pipework caused by variations in liquid temperature • reduction of mechanical influences in connection with pressure surges in the pipework •...

  • Page 17: Bearing Bracket

    7.8 Bearing bracket Filling of oil 7.8.1 Bearing bracket with grease lubrication Fig. 19 Bearing bracket with grease nipples Fig. 22 Filling of oil Relubricate the bearings by means of a grease gun. See section Step Action to get recommended re- 11.2.1 Grease-lubricated bearings lubricating intervals.

  • Page 18: Bearing Monitoring

    Pt100 sensors for monitoring the temperature of the bearings. These sensors can be factory-fitted, but can also be retrofitted. A Grundfos sensor is available. 1/4" tapping for Pt100 sensor Fig. 26 Pt100 sensors fitted in bearing bracket...

  • Page 19: Flange Forces And Torques

    2275 3360 * ΣF and ΣM are the vector sums of the forces and torques. If not all loads reach the maximum permissible value, one of the values is allowed to exceed the normal limit. Contact Grundfos for further information.

  • Page 20: Electrical Connection

    Fit a sinusoidal filter and check that the circuit breaker. 690 V and higher motor has reinforced insulation. All three-phase Grundfos MG and MMG motors of 3 kW and up incorporate a thermistor. See the instructions in the motor 10. Commissioning and startup terminal box.

  • Page 21: Priming

    10.3 Priming 10.4 Checking the direction of rotation Closed systems or open systems where the liquid level is Warning above the pump inlet The pump must be filled with liquid when 1. Close the discharge isolating valve and slowly open the checking the direction of rotation.

  • Page 22: Shaft Seal Run-In Period

    10.6 Shaft seal run-in period 11. Maintenance The seal faces are lubricated by the pumped liquid, meaning that Warning there may be a certain amount of leakage from the shaft seal. Before starting work on the product, switch off When the pump is started for the first time, or when a new shaft the power supply.

  • Page 23: Lubrication Of Bearings In Bearing Bracket

    See section kits. New 13.1 Service period, it is advisable to replace the bearings. See section bearings must be filled with grease according to Grundfos 13.1 Service kits. specifications. Clean up all the used grease in the bearing bracket before replacing the new bearing.
  • Page 24 Grundfos recommends SKF LGHP2 grease for relubrication. See Relubrication via grease nipples the table below. Grundfos recommends the following relubricating intervals and grease quantities: Basic characteristics Grease quantity [g] Code, DIN 51825 K2N-40 Relubricating Diameter of interval Consistency class, NLGI...

  • Page 25: Monitoring Equipment

    11.2.2 Oil-lubricated bearings 11.3 Monitoring equipment It is advisable to take weekly readings of these parameters: • vibration level - use SPM measuring points • bearing temperature - if sensors have been fitted • inlet and outlet pressure - use pressure gauges. Alternatively, follow the maintenance plan laid out for your application.

  • Page 26: Service

    If Grundfos is requested to service such a pump, Grundfos must be contacted with details about the pumped liquid, etc. before the pump is returned for service. Otherwise Grundfos can refuse to accept the pump for service.

  • Page 27: Fault Finding

    15. Fault finding Warning Before removing the terminal box cover and before removing/dismantling the pump, make sure that the power supply has been switched off and that it cannot be accidentally switched on again. Fault Cause Remedy 1. Pump delivers no or a) Wrong electrical connection, for instance two Check the electrical connection and remedy, if too little liquid.

  • Page 28: Disposal

    This product or parts of it must be disposed of in an environmentally sound way: 1. Use the public or private waste collection service. 2. If this is not possible, contact the nearest Grundfos company or service workshop. Subject to alterations.
  • Page 29 Appendix Sound pressure levels 60 Hz The data in this table applies for pump including motor, 2-pole: n = 3500 min (MG, MMG, Siemens and TECO motors). 4-pole: n = 1750 min The values stated are maximum sound pressure levels. 6-pole: n = 1170 min Tolerances are according to ISO 4871.
  • Page 31 Norway Turkey Siu Wai Industrial Centre GRUNDFOS Pumper A/S Phone: +387 33 592 480 GRUNDFOS POMPA San. ve Tic. Ltd. Sti. 29-33 Wing Hong Street & Strømsveien 344 Telefax: +387 33 590 465 Gebze Organize Sanayi Bölgesi 68 King Lam Street, Cheung Sha Wan Postboks 235, Leirdal www.ba.grundfos.com...
  • Page 32 96646512 0515 ECM: 1157115 www.grundfos.com...

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