Chapter Corner

Excel Electrical Technologies: Mitsubishi Power Systems Americas

Posted in: November/December 2013

Excel.gifLocated on 121 acres near Savannah, Georgia, Mitsubishi Power Systems Americas - Savannah Machinery Works is a service and manufacturing center for gas turbines, steam turbines, and generators. It is Mitsubishi's first facility outside of Japan to manufacture and repair its G- and J-class turbines used in power plants.

Excel Electrical Technologies was responsible for the electrical design and construction of the initial project as well as Bays 3 and 4. Bay 5 was awarded to Excel in a design assist and build role. Beginning in late 2009 the overall project was completed in June 2013 with the final contract sum exceeding $11 million.

The initial project at award consisted of a 30,000-square-foot office facility and two bays of manufacturing plant (Bays 1 & 2 totaling approximately 130,000 square feet). Three more manufacturing bays were subsequently added totaling approximately 240,000 square feet, bringing the total project to approximately 400,000 square feet.

Due to Mitsubishi's commitment to incorporate state-of-the-art process equipment at this facility, selection of the equipment typically occurred after the design of electrical services and distribution. Electrical characteristics of much of the equipment could not be determined until the equipment arrived on site.

Excel_Mitsub.pngExcel based its design on a worst-case scenario for load demand sizing distribution panels to allow flexibility and to include adequate spare capacity. This flexibility proved beneficial over and over as Excel was able to facilitate the changing requirements for the process equipment.

Another challenge for Excel was routing the feeds to more than 130 pieces of equipment. The feeds could not be run high overhead and dropped down, as it would interfere with the pathways utilized by more than 30 cranes. A system of pipe trestles and basket cable tray was designed and installed by Excel to allow the multiconductor power tray cable feeds to run on the bridges. This solution provided a safe work area and allowed the owner the flexibility to relocate equipment with minimal effort in the future.

The prime contractor's project manager said, "From the beginning it was clear Excel had both the initiative and expertise to pull together an aggressive design and construction schedule. Excel provided superior service in cost and constructability of the electrical aspect of this project. The size and complexity of the facility, along with continuous design changes required innovative concepts in design and construction, and Excel exceeded the expectations for both."