Turbomachinery International


GE moves away from air to steam cooling in 7HA and 9HA
GE is releasing air-cooled H-class gas turbines. Two versions will be available for the 50 Hz market (9HA.01 and 9HA.02), and two versions for the 60 Hz market (7HA.01 and 7HA.02). GE’s first steam-cooled H-class turbines also operate at more than 2600°F. But sales have not been as robust as expected.


Mistuning of steam turbine blade packets
There are many steam turbine rotor stages with blades connected together for added reliability, making them much more difficult to excite from alternating forces such as upstream vane wakes and potential flow effects such as partial admission. 

New boss for Mitsubishi Hitachi in the Americas
David M. Walsh has been appointed President and Chief Executive Officer of Mitsubishi Hitachi Power Systems Americas, Inc. (MHPSA) effective April 1, 2014.  

March/April 2014



Modular or standardized assembly is catching on in combined cycle power plant design and construction. But is it right for every job?

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