7 Mechanical Power Transmission Disc Couplings Overview Driven equipment SFA BLOWERS, FANS Centrifugal 1.0 Lobe / Vane / Turboblowers 1.25 Forced draught fans 1.5 Induc.draught with damper 1.5 Induc.draught without control 2.0 Cooling towers 2.0 CHEMICAL INDUSTRY Agitators (thin liquid) 1.0 Agitators (viscous liquid) 1.5 Centrifuges (light) 1.25 Centrifuges (heavy) 1.75 Mixers 1.75 COMPRESSORS Centrifugal 1.0 Lobe/Rotary 1.25 Turbo-compressors 1.75 Reciprocating: 1 to 3 cylinders 3.0 4 or more cylinders 1.75 CONVEYOR, HOISTS , ELEVATORS * * Conveyors: Screw / Apron / Belt / Chain 1.25 Bucket / Rotary / Lifts 1.5 Reciprocating 3.0 Hoists: Medium duty 2.5 Heavy duty 3.0 Elevators: Centrifugal and gravity disc 1.25 DREDGERS 2.0 FOOD INDUSTRY Packaging machines and fillers 1.25 Kneading machines 1.5 Cane crushers 1.5 Cane cutters 1.5 Cane mills 2.0 Sugar beet cutters 1.5 Sugar beet washing machines 1.5 GENERATORS Even load 1.0 Frequency converters 1.5 Welding generators 2.0 MACHINE TOOLS Main Drives 2.0 Auxiliary and transverse drives 1.5 METAL WORKING Presses/Hammers 2.0 Straighteners 2.0 Bending machines / Shears 1.5 Punching machines 2.0 MARINE APPLICATIONS 2.5 MINING AND STONES Crushers 2.5 Mills 2.5 Mine ventilators 2.0 Vibrators 1.5 OIL INDUSTRY Pipeline pumps 1.5 Rotary drilling equipment 2.0 PAPER INDUSTRY Calenders 2.0 Couches 2.0 Drying cylinders 2.25 Pulpers 2.0 Pulp grinders 2.0 Suction rolls 2.0 Wet presses 2.0 Reels 2.0 Agitators 2.0 PLASTIC INDUSTRY Calenders, Crushers, Mixers 1.75 PUMPS Centrifugal, General Feed or Boiler Feed 1.0 Centrifugal, Slurry 1.5 Centrifugal, Dredge 2.0 Rotary / Gear / Lobe or Vane 1.5 Reciprocating: 1 cylinder 3.0 2 cylinders, single acting 2.0 2 cylinders, double acting 1.75 3 cylinders or more 1.5 ROLLING MILLS Billet shears 2.5 Chain transfers 1.5 Cold rolling mills 2.0 Continuous casting plants 2.5 Cooling beds 1.5 Cropping shears 2.0 Cross transfers 1.5 Descaling machines 2.0 Heavy and medium duty mills 3.0 Ingot and blooming mills 2.5 Ingot handling machinery 2.5 Ingot pushers 2.5 Manipulators 2.0 Plate shears 2.0 Roller adjustment drives 1.5 Roller straighteners 1.5 Roller tables (heavy) 2.5 Roller tables (light) 1.5 Sheet mills 2.5 Trimming shears 1.5 Tube and welding machines 2.0 Winding machines 1.5 Wire drawing benches 1.5 RUBBER INDUSTRY Extruder 1.75 Calender 2.0 Mixing mill / Refiner / Crusher 2.5 STEEL PLANTS Blast furnace blowers 1.5 Converters 2.5 Inclined blast furnace elev. 2.0 Crushers 2.0 TEXTILE MACHINES Printing and drying machines 1.5 Tanning vats 1.5 Calenders 1.5 Looms 1.5 WATER AND WASTE INDUSTRY Aerators, Screw pumps, Screens 1.5 WOOD WORKING MACHINERY Trimmers, Barkers, Saws, Planes 2.0 Note: * The coupling is not recommended or be warranteed if people are transported. Driving Machine Service Factor SF DTable 2 Driving equipment SFD Multi-cylinder engine 8 or more 0.5 6 1.0 4 or 5 1.5 Less than 4 Refer to jbj Techniques. Variable speed motors 0.8 Electric motors** and turbines 0 **Except variable speed motors, please consult jbj Techniques technical office if axial excitations are foreseeable either on the driving or driven side. Selection Procedure 1. Select the coupling type. 2. Select the driven machine service factor SF from Table 1. A 3. Select the driving machine service factor SF from Table 2. D Care should be taken when the driving machine is other than a standard electric motor or turbine. Some engines will impose extra fluctuations on the drive system and allowance should be made accordingly. Please refer to Table 2. A torsional coupling may be required for diesel drives. The two service factors SF and SF must be added resulting in the combined service factor SF. SF = SF + SF A D A D Driven Machine Service Factor SF ATable 1. www.jbj.co.uk/disc-couplings.html #DriveLineHarmony
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