When this 333KVA base building unit failed as part of a 1000KVA group of transformers, Galasso was contracted to make the emergency swap. Due to the age of the building, the load carrying capacity of the floor slabs was a concern. The decision was made to bypass the available live load capacity of the slabs and transfer all the rigging loads imposed directly to the structural members via a floating frame work of steel tubing spanning the floor beams. The 4-ton unit was extracted from the vault on the 38th floor and relocated to the elevator on a steel skid designed to slide on the floating frame. The elevator car itself was not designed to lift this weight, so using a modular rigging device that extended a boom with four-part line fall and crane block into the shaft GTI was able to lower the old unit AND the elevator car together manually to the ground level. The old unit was then transfer to an identical skid staged on the first floor, slid down the hallway using an electric winch, and removed. The local power company delivered the new unit to the job site and accepted the old unit for removal.
The new unit was installed in the reverse order.