Great Southern Technologies (GST) is a specialty engineering company that encompasses unique creative & custom design methodologies to all new and used direct fired heaters and auxiliary equipment. As an InServ company, GST also incorporates optimal constructability methods to every project that allows for minimum turnaround duration and cost. GST provides the following cost-effective solutions: Design & Supply of New Direct Fired Heaters, Engineering Performance Studies, Process Heater Field Construction & Installation, Modifications of Existing Process Heaters, Emergency Responses, Combustion Air Preheat and SCR Systems, Tight Sealing Observation Doors, Heater Parts & Piping Fabrication, Dedicated Staff in Developing and Managing Turnkey Projects.