Investigators have compared results of gas turbine hot section material rig tests to field experiences with identical materials. They proposed that such correlation would be useful for turbine design engineers. But gas turbine users, particularly in the marine field, need a guide to correlate the few reported hot section experiences and realistically project when parts should be replaced. It is suggested that most hot section materials in properly protected marine gas turbines have much lower deterioration rates than those predicted. After coatings on turbine nozzles and blades have been operationally removed, increasingly better predictions of replacement time are possible. Sample at-sea experiences and environmental full-scale test results are offered to illustrate some unity among isolated experiences within a generalized framework of gas turbine hot section deterioration. A method for predicting further useful life of hot parts is proposed. A procedure and tool for in-place nondestructive evaluating of hot section deterioration are offered with a guide for scheduling future maintenance sections.

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