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MG Set Removal & ASD Installation

Problem: Barnhart was contracted to assist in the removal an MG set and the installation of new ASDs, but the installation area was difficult to access.

Solution: The equipment had to be lifted and side-shifted to a waiting slide track.

Barnhart was contracted to provide engineering, equipment and operators/supervisors to assist in the removal of an existing motor generator (MG) set and the installation of new automatic speed drives (ASD). Access and location of the work area presented some challenges. Existing equipment needed to be lifted with hydraulic jacks then side-shifted with channel Iron/Hillman rollers about 15' to the waiting slide track.

Once the equipment was on the slide track system Barnhart slid the components about 60' to access the hole. This allowed us to then utilize the monorail system we had installed pre-outage. On the upper elevation we installed a monorail sitting on top of our slide tracks which allowed the monorail hoist to be moved in all directions. Set components were then lowered one floor to waiting trucks for removal out of the building.

This same process was used for the existing concrete foundation that supported the MG sets. The new ASDs were installed in the reverse order. Since they were longer and wider at one point, some of the slide track had to be removed to allow the ASDs to be raised through the access hole and then reinstalled. The overall project finished two days ahead of schedule resulting in a satisfied customer.