www.jbj.co.uk/couplings.html#flender Selection of the Coupling Size The torque load of the couplingmust be determined from the output of the drivenmachine and the coupling speed. Rated coupling load T = 9550 x P / n N N N (T in Nm; P in kW; n in rpm) N N N The rated coupling load obtained in this way must be multiplied by factors and compared with the rated coupling torque. An ideal but expensive method is to measure the torque characteristic on the coupling. For this, Flender offers special adapters fitted with torquemeasuring devices. The rated coupling torque T is the torque which can be transmitted by the coupling over an appropriate period of use if the load is applied to the coupling KN purely statically at room temperature. Application factors are to express the deviation of the real coupling load from the "ideal" load condition. Coupling Load inContinuousOperation The operating principles of the driving and driven machines are divided into categories and the application factor FB derived from these in accordance with DIN 3990-1. Application factor for N-EUPEX, N-EUPEX-DS, RUPEX, N-BIPEX, ELPEX-B, N-ARPEX,ARPEX, ZAPEX and FLUDEX Examples of torque characteristic of drivingmachines: » uniform: Electric motors with soft starting, steam turbines. » uniformwithmoderate shock loads: Electric motors without soft starting, hydraulic motors, gas and water turbines. » non uniform: Internal-combustion engines. Examples of torque characteristic in drivenmachines: » uniform: Generators, centrifugal pumps for light fluids. » uniformwithmoderate shock loads: Centrifugal pumps for viscous fluids, elevators, machine tool drives, centrifuges, extruders, blowers, crane drives. » non uniform: Excavators, kneaders, conveyor systems, presses, mills. » very rough: Crushers, excavators, shredders, iron/smeltingmachinery. Application factor FB Torque characteristic of the driving machine Torque characteristic of the driven machine Uniform Uniform Non Uniform Very Rough uniform 1.0 1.25 1.5 1.75 uniform with moderate shock loads 1.25 1.5 1.75 2.0 non uniform 1.5 1.75 2.0 2.5 8 #DriveLineHarmony Technical Information Mechanical Power Transmission Couplings Temperature Factor FT Temperature T on the Coupling a Elastomer Low Coupling under -30°C up up to up to up to up to up to up to up to Material Temperature °C -30°C to 50°C 60°C 70°C 80°C 90°C 100°C 110°C 120°C N-EUPEX NBR -30 – 1.0 1.0 1.0 1.0 – – – – 1) N-EUPEX NR -50 1.1 1.0 – – – – – – – N-EUPEX HNBR -10 – 1.0 1.0 1.0 1.0 1.25 1.25 – – N-EUPEX DS NBR -30 – 1.0 1.0 1.0 1.0 – – – – RUPEX NBR -30 – 1.0 1.0 1.0 1.0 – – – – RUPEX NR -50 1.1 1.0 – – – – – – – RUPEX HNBR -10 – 1.0 1.0 1.0 1.0 1.25 1.25 – – N-BIPEX TPU -50 1.0 1.0 1.0 1.0 1.0 1.0 1.0 – – ELPEX NR -40 1.1 1.0 1.25 1.40 1.60 – – – – ELPEX-B NR -50 1.1 1.0 – – – – – – – ELPEX-B CR -15 – 1.0 1.0 1.0 – – – – – ELPEX-S SN, NN, WN NR -40 1.1 1.0 1.25 1.40 1.60 – – – – ELPEX-S NX VMQ -40 1.1 1.0 1.0 1.0 1.0 1.1 1.25 1.4 1.6 1) The N-EUPEX coupling is not suitable for shock loads when used at low temperatures.
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