SITEX® ST gear couplings available from jbj Techniques Limited #DriveLineHarmony Coupling Selection ® SITEX ST Gear Couplings 7 1) Select the coupling according to the largest shaft diameter 2) Calculate the nominal torque TN to be transmitted: TN = 9550 P n With P = nominal power installed (kW), n = rpm in the drive (1/min) 3) Select the correct service factors k1 and k2 4) Verify the nominal torque of the coupling is greater than the corrected machine nominal torque: Tkn ≥ TN ∙ k1 ∙ k2 With k1 application service factor and k2 angular misalignment (per hub) service factor. 5) Verify the machine peak or starting torque Ts is lower than the coupling maximum torque T . kmax 6) Verify the maximum misalignments are respected. 7) Verify the hub shaft connection could bear the transmission peak torque. If necessary change the hub shaft connection type. 8) Verify the maximum RPM of the coupling is respected. Application service factor k1 Hydraulic motors, gears drivers Electrical generators Centrifugal pumps and compressors Light fans, escalators, belt and chain conveyors. Multistage centrifugal blowers, Steel wire machine Reciprocating pumps, Large fans, Agitators (liquids) Machine tools main drive Conveyor and elevators not uniform loaded. Reciprocating compressors and pumps Cranes, Agitators (solids) Hoisting equipment, Calenders for rubber or plastic Winding machine (paper industry). Laundry machines, Mixers for rubber and plastic Road and rail machines/equipment, Cranes ( heavy duty) Pulp grinders and refiners, paper presses Marine drives, mine fans, Wire drawing, Metal mills drives Heavy duty drives in steel mills, Hammer mills, rubber and plastic mills, Stone crushers. Continuous duty without overloads, occasional starts up. Continuous duty with light overloads and shocks for a short time and not frequent. Intermittent duty with frequent light shocks, medium overloads (short time). Duty with very high and frequent shocks, frequent load reversal. Load Type Type of Service Application Driven Machine Driver machine Reciprocating engine electric motors frequent starts UNIFORM 1 1,25 1,5 LIGHT peak torque 1,4 1,75 2 MEDIUM peak torque 1,75 2 2,5 HEAVY peak torque 2 2,5 3 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1 0,0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 Angular misalignement Kd [] ° Service factor k2 n= 0,06 • nmax n = 0,10 • nmax n = 0,16 • nmax n = 0,25 • nmax n = 0,45 • nmax n = 0,65 • nmax n = n max Service factor k2 for angular misalignment Angular misalignment ± (°) Electric motors or turbines Hydraulic motors, gears drivers