© Siemens AG 2015 FLENDER Standard Couplings Highly Flexible Couplings — ELPEX-S Series General information Coupling load under maximum and overload conditions The maximum torque is the highest load acting on the coupling in normal operation. Maximum torques at a frequency of up to 25 times an hour are permitted and must be lower than the maximum coupling torque. Examples of maximum torque conditions are: Starting opera- tions, stopping operations or usual operating conditions with maximum load. The following must apply to all load situations: n Kmax ≥ n max The maximum speed of a size depends only on the size of the outer flange (part 3).
Checking the maximum speed Checking permitted shaft misalignment and restorative forces For all load situations, the actual shaft misalignment must be less than the permitted shaft misalignment. T Kmax ≥ T max ⋅ FT Overload torques are maximum loads which occur only in com- bination with special, infrequent operating conditions. Examples of overload torque conditions are: Motor short circuit, emergency stop or blocking because of component breakage. Overload torques at a frequency of once a month are permitted and must be lower than the maximum overload torque of the coupling. The overload condition may last only a short while, i.e. fractions of a second.
Checking bore diameter, mounting geometry and coupling design The check must be made on the basis of the dimension tables. On request, couplings with adapted geometry can be provided. Checking shaft-hub connection T KOL ≥ T OL ⋅ FT Please refer to catalog section 3 for instructions. Checking temperature and chemically aggressive environment Coupling load due to dynamic torque load Applying the frequency factor FF, the dynamic torque load must be lower than the coupling fatigue torque. The permitted coupling temperature is specified in the Temper- ature Factor FT table. In the case of chemically aggressive envi- ronments, please consult the manufacturer.
Dynamic torque load T KW ≥ T W ⋅ FT ⋅ FF ⋅ 0.6 FB – 1.0 Frequency of the dynamic torque load f err ≤ 10 Hz frequency factor FF = 1.0 Frequency of the dynamic torque load f err > 10 Hz frequency factor FF = √ ( f err /10 Hz) Operation in potentially explosive environments is subject to the following restriction: Operation with low fatigue load The fatigue torque T KW must be reduced by 70 %. In these particular operating conditions the coupling satisfies the require- ments of temperature class T4 D120 °C. Operation with medium fatigue load The fatigue torque T KW must be reduced by 50 %.
In these particular operating conditions the coupling satisfies the require- ments of temperature class T3 D160 °C. 11 Type EST is not permitted for application in potentially explo- sive environments. 11/5 Siemens MD 10.1 · 2015