IST specializes in design, manufacture and installation of Once Through Steam Generators (OTSGs) for Power Generation and Enh ... anced Oil Recovery (EOR) Applications. The Power Generation OTSG provides a simpler, smaller, and more efficient alternative to drum-type HRSGs. IST has become a market leader in the 10 to 100 megawatt size range gas turbine with installations in 19 countries around the world. At IST we found a better way! Our SQ90™ Enhanced Oil Recovery OTSG guarantees 90% steam quality, better than the norm at 75-80%. The SQ90™ reduces operating costs and environmental impact. read more