Mitsubishi Heavy Industries, Ltd. developed the M501H gas turbine to improve the efficiency and power of G series using closed steam cooling of stage 1 and 2 blades and vanes following the firm’s experience in the construction of the D, F and G series. Development included elementary tests for pre-verification and trial operation using a combined plant verification plant to reach 220MW in May 1999 and to verify the stability of the steam cooling rotor, cooling properties of blades and vanes, and the efficiency of major components. The few remaining items can be easily taken care of.

The next operation is planned to complete verification.

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