There are a number of factors that influence Falk F coupling selection. The first step, of course, is to calculate your torque requirements – grid-style F couplings are designed to handle the most torque of any coupling type. The next rating to consider is service factor.
A coupling’s service factor is based on the estimated severity of torque during operation (culled from engineer experience). In other words, this standard rating system indicates how much torque fluctuation the coupling can withstand while the unit is running. The following is a basic breakdown of service factors for F couplings.
1.0: Couplings with the lowest service factor requires fairly constant torque, such as from centrifugal pumps, blowers or compressors.
1.5: These couplings are built to handle continuous operation with minor torque variations, such as from plastic extruders or forced draft fans.
2.0: This service factor is acceptable for the light shock loads from metal extruders or cooling towers.
2.5: These couplings can endure moderate shock loads from applications such as stone crushers and vibrating screens.
3.0: Systems with heavy shock loads and some negative torques – including roughing mills, reciprocating pumps and compressors – will require this rugged service factor.
For applications involving frequent torque reversals that don’t necessarily cause reverse rotations, consult a Falk engineering expert such as those at Mar-Dustrial. Our experienced, highly trained staff can help you select the right F coupling for the job.