7EA Users Group

HIGH-VOLTAGE ELECTRICAL EQUIPMENT GE’s 7EA gas turbine is widely respected for its reliability, operational flexibility, and efficiency in simple-cycle, combined-cycle, and cogeneration systems, and mechanical-drive applications (Fig 1). This frame has been upgraded and improved continuously since its introduction some three decades ago. Today, it is rated up to 90 MW in simple-cycle service. Combined […]

The city of Ottawa’s gas-turbine-powered combined cycle was honored as an Historic Mechanical Engineering Landmark by the American Society of Mechanical Engineers, Sept 13, 2024, in a special ceremony conducted in the Ottawa Memorial Auditorium. Dave Hunsaker, electric superintendent for the city, accepted the award from ASME Fellow Jared Oehring, a member of the society’s

By Steven C Stultz, Consulting Editor The seventh annual International Conference on Film Forming Substances (FFS), conducted in Prato, Italy, March 26-28, 2024, was developed and supported by the International Association for the Properties of Water and Steam (IAPWS). The meeting drew 50 participants from 16 countries—including 10 plant owner/operators and representatives from a dozen

Legacy Turbine Doctor, No. 2 in a series By Luke Williams, PE, Consultant www.geLegacyGasTurbineSupport.com An MS7001B engine with Mark I Speedtronic™ controls failed to start reliably for about a year. Failure-to-start causes included loss of flame, trip at Complete Sequence to full-speed/no-load (FSNL), trip on 95% speed (14HS), TNH (high-pressure shaft speed) bog-down, and unknown.

By Vaughn Watson, Vector Systems Inc The efficiency and long-term performance of an SCR depends largely on several key design considerations regarding various system components. When complex NOₓ reductions on combined cycles are required, there are critical values related to the fluid distribution in the system which must be addressed to ensure success. While the