T.D. Williamson is a privately owned company that provides pipeline equipment and services and is located in Tulsa, Okla. The company has a professional staff of engineers, project managers and technicians that provide a wide range of customized solutions. It offers a wide range of pipeline services, such as hot tapping and plugging, cutter and equipment repair, hydrostatic testing, consulting and pipeline cleaning services. The company also offers a variety of other services that include project planning and geometry inspection services. It provides services to various industries, including oil and gas transmission pipelines, gas distribution systems, power plants, wastewater systems, commercial construction, and refinery and petrochemical facilities. T.D. Williamson, established in 1920, has an ISO 9001 certification.