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A vibration diagnostic system has been developed for the main steam turbine of a 375MW fossil power plant. The diagnostic system continuously monitors the shaft vibration of the main steam turbine as well as various process data. Also, the system uses an Al expert system to diagnose the cause of vibration owing to the turbine failure or malfunctions as they occur or tend to occur.

Water (working fluid) lubricated bearings are used in various pump designs. This type of bearing has many characteristics different from usual oil lubricated bearings. This paper describes the following characteristics of the water lubricated bearings : (1) Turbulent flow (2) Full film due to high ambient pressure (3) Large additional mass effect Theoretical analysis by numerical calculation and model test using a special test system are performed for a cylindrical bearing. As a result, the characteristics of the water lubricated bearing are recognized and good agreement between theoretical and experimental results is confirmed.

This paper describes the vibration analysis technology of MW-701D Gas Turbine which was developed by Mitsubishi Heavy Industries, Ltd. for 50 Hz utilities. MW-701D is the highest performance gas turbine available with a firing temperature of 1,154°C for base load operation. It is employed by the 1,090 MW combined cycle plant, one of the largest of its kind in the world, and the plant began commercial operation at half of the total capacity of 1,090 MW in December, 1984. The plant was designed to supply base load electric power generation by burning imported liquefied natural gas (LNG) fuel. This paper describes the general description of the combined cycle plant and the vibration characteristics of MW-701D Gas Turbine.