17 #DriveLineHarmony Suggested service factors listed are typical values based on normal operation of the mechanical power transmission system. Quick Flex Couplings Service Factors for Applications www.jbj.co.uk/couplings.html Application Service Factor Cylinder, Dryer 2.00 Felt Stretcher 1.75 Fourdrinier 2.00 Jordan 2.5 Log Haul 2.5 Line Shaft 1.75 Press 2.0 Pulp Grinder 2.0 Reel, Rewinder, Winder 2.0 Stock Chest, Washer, Thickener 1.75 Stock Pumps, Centrifugal Constant Speed 1.25 Frequent Speed Changes Under Load 1.5 Suction Roll 2.0 Press, Printing 1.5 Pug Mill 1.75 Pulverizers Hammermill and Hog 1.75 Roller 1.5 Pumps: Centrifugal Constant Speed 1.0 Frequent Speed Changes Under Load 1.75 Descaling, with Accumulators 1.75 Gear, Rotary or Vane 1.75 Pumps: Reciprocating One Cylinder, Single or Double Acting 3.0 Two Cylinder, Single Acting 2.5 Two Cylinder, Double Acting 2.0 Three or More Cylinders 2.0 Rubber Industry Calendar 2.25 Cracker, Plasticolour 2.5 Extruder 2.0 Tire and Tube-Press Opener (Peak Torque) 1.5 Warming Mill One or Two Mills in Line 2.0 Three or More Mills in Line 2.50 Washer 2.75 Screens Air Washing 1.5 Grizzly 2.5 Rotary Coal or Sand 2.0 Vibrating 2.5 Water 1.5 Sewage-Disposal Equipment Bar Screen, Chemical Feeders, Collectors, Dewatering, Screen, Grit Collector 1.5 Mill Stands, Turbine Driven with all Helical or Herringbone Gears 1.75 Application Service Factor Electric-Drive or Steam-Engine Drive with Helical or Herringbone 2.0 Stoker 1.0 Sugar Industry Cone Carrier and Leveler 2.25 Cane Knife and Crusher 2.5 Mill Stands, Turbine Driver with all Helical or Herringbone Gears 1.75 Electric-Drive or Steam-Engine Drive with Helical, Herringbone or Spur Gears with any Prime Mover 2.0 Textile Industry Batcher 1.5 Calendar, Card Machine 1.75 Cloth-Finishing Machine 1.75 Dry Can, Loom 1.75 Dyeing Machinery 1.5 Knitting Machine Refer to Equipment OEM Mangle, Napper, Soaper 1.5 Spinner, Tenter Frame, Winder 1.75 Tumbling Barrel 2.0 Winch, Maneuvering: Dredge, Marine 1.5 Windlass 1.5 Engine Service Factor Application Service Factor Engine Service Factor 4 to 5 Cylinders 6+ Cylinders 1.00 2.00 1.50 1.25 2.25 1.75 1.50 2.50 2.00 1.75 2.75 2.25 2.00 3.00 2.50 Engine Drive Service Factors Service factors for engine drives are those required for applications where good flywheel regulation prevents torque fluctuation greater than 20 percent. For drives where torque fluctuations are greater or where the operation is near a serious critical or torsional vibration, a mass elastic study is necessary. To determine an engine drive service factor, first determine the application service factor for motors. Then, use that to find the correct engine service factor in the table below. When the application service factor for motors is greater than 2.0 or where one, two or three cylinder engines are involved, contact jbj Techniques Limi ted technical office telephone: +44 (0)1737 767493 or email: info@jbj.co.uk with complete application details for an engineering review.
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