Pretension force evaluation method for screw coupling e.g. for turbine or nuclear power plant, uses capacitive senor for detecting thickness variation in dielectric layers caused by pretension

摘要

The pretension force evaluation method has the pretension force to be measured used for altering the thickness of dielectric layers, for allowing capacitive measurement of the pretension force via a capacitive sensor incorporated in the screw coupling between a pair of pressure discs (101). An Independent claim for a screw coupling pretension force evaluation device is also included.