Method for retrofitting a turbomachine

A method for retrofitting a turbomachine by replacing a first trip cup of the turbomachine with a second trip cup and by replacing a mechanical flyweight governor with a mechanical-hydraulic governor, the first trip cup including a throw-out arm connected to a first trip cup spring, and the second trip cup including a plunger disposed in a hole defined by the second trip cup and a plunger spring encircling the plunger in the hole, the method comprising:

• removing the first trip cup and a first housing enclosing the first trip cup from the turbomachine, the turbomachine comprising a trip paddle;
• installing the second trip cup in the turbomachine, the second trip cup being installed such that, when a speed of the turbomachine exceeds a predetermined value, the plunger propels radially outwards from the second trip cup and deflects the trip paddle disposed adjacent the second trip cup, the trip paddle being disposed such that a location of the trip paddle in the retrofitted turbomachine is the same as the location of the trip paddle when the first trip cup was installed on the turbomachine;
• removing the mechanical flyweight governor from the turbomachine and a first set of governor linkages coupling the mechanical flyweight governor to a steam source supplying steam to the turbomachine;
• and
• installing the mechanical-hydraulic governor in the turbomachine, the mechanical-hydraulic governor being coupled to a shaft of the turbomachine and being coupled to the steam source via a second set of governor linkages.