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In this paper, the authors describe construction and initial operating experience on two prototype gas turbine power plants located thousands of miles apart: Isefjordvaerket’s 140-MW plant at Kyndby, Denmark, built by Brown Boveri-Sulzer Turbomachinery (BST) and Northern States Power’s 200-MW plant at Blue Lake, Minnesota, built by Turbodyne Corporation (TBD). The paper provides a unique opportunity of comparing two approaches to a similar plant construction concept.

The expenditures for inspection and maintenance of gas turbines are an important part of the total owning and operating costs. Maintenance outage time should be kept to a minimum. A proper design with adequate ports facilitates visual and boroscope inspection of critical areas. Maintenance outage time can be con• siderably reduced by special equipment which allows inspection and replacement of bearings and combustor inner parts and balancing of rotors without major disassembly of the unit. The advantages of an indoor installation with overhead crane with respect to maintenance are also discussed in this paper.