Founded in 1953, Southern Flow Companies provides a range of calibration and analytical services for natural gas producers. It is one of the largest, independent measurement companies in the United States. The company offers various field measurement solutions, such as equipment installation, inspection and maintenance. Southern Flow Companies provides meter proving, electronic data delivery, and flow data development and management services. The company also supplies a variety of equipment, including valves, solar panels, catalytic gas heaters, thermometers, and electronic and mechanical meters. It serves oil, petrochemical, gas gathering, pipeline and transmission companies. Southern Flow Companies operates more than 10 division offices in Texas, Mississippi, Louisiana and Oklahoma. The company maintains several liquid metering facilities.