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Final Direct Surge Control Report & GMRC Project Plan Increased Flexibility of Turbo-Compressors in Natural Gas Transmission Through Direct Surge Control Final Direct Surge Control Report & GMRC Project Plan October 2001 - December 2004 Prepared by Robert McKee Shane Siebenaler Danny Deffenbaugh of Southwest Research Institute ® Project Identification This DOE project was directed and funded by DOE’s Office of Fossil Energy, the National Energy Technology Laboratory, and the Strategic Center for Natural Gas and Oil, in the Delivery Reliability Program, as part of the Natural Gas Infrastructure Program. The Co-funders are the Gas Machinery Research Council and Siemens Energy and Automation Other participants were Duke and El Paso Energy and Solar Turbines. Conducted by Southwest Research Institute