Updated EPRI report on Mitsubishi Heavy Industries gas turbines includes information on new M701F4 engine.

The latest upgrade to Mitsubishi’s F-class 50-Hz air-cooled engine, the M701F4, boasts an impressive 59.4% efficiency in combined-cycle operation (ISO, LHV basis). The new model includes an improved compressor airfoil design and longer blades for higher capacity, higher pressure ratio, and improved efficiency. The last stage turbine blading is lengthened and the exhaust diffuser area is increased for reduced exhaust losses. Firing temperature is raised about 45°F (25°C). EPRI report 1012715 is one of a series that addresses the design evolution, durability, and reliability of all large heavy-duty and aeroderivative combustion turbines. Such information will help owners and developers make procurement decisions, assess combustion turbine design features, and understand changes that drive the technologies' technical risks. The report series also offers insights into the state of product reliability and maturity while providing a critical life-cycle perspective. For more information, contact Dale Grace at 650.855.2527 (dgrace@epri.com).