A review is made of all General Electric Company Gas Turbines installed and operated previous to January 1, 1958. The gas turbines are reviewed with respect to application, fuels burned, fired hours, and miscellaneous features. Each different basic design is briefly described, with date of first operation and total number installed given. Gas turbine failures that have occurred in operation are discussed.

Availability, reliability, and use factors are given. A brief review of published articles by gas turbine owners and operators is made. Problems that have occurred in eight and one-half years of operation are discussed, and solutions are given. Maintenance requirements and life of gas-path parts are discussed.

A brief description of future activity, new basic designs, new features, and new installations is included.

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