Gas turbine coupling developed for GE generators

The IHI group has been working closely with Bibby Turboflex, which is part of Altra Industrial Motion, to develop a set of high performance couplings capable of transmitting the power of a General Electric LM6000 aeroderivative gas turbine, connecting the rotor shaft of the turbine to the gearbox and the gearbox to the generator.

Both couplings are designed within API671 which requires some very high level specification and traceability for the components.

The low speed coupling employs a set of shear pins that provide a method of disconnecting the drive system in the event of an overload. Meanwhile the high speed coupling uses a coplanar arrangement at its turbine end. The interlocking element and spacer end flanges have the advantage of keeping overhung mass as low as possible thus minimising the load on the turbine shaft bearing.

(Images: Left Low speed coupling employs a set of shear pins that provide a simple, effective and precise method of disconnecting the drive system in the event of an overload. Right Bibby Turboflex High Performance couplings deliver a basis from which to create both the high speed and low speed couplings).

 

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