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T.D. Williamson provides equipment and services for maintaining and assessing pressurized pipeline systems.
Founded in 1920, T.D. Williamson supplies pipeline isolation, pigging, and integrity assessment products and services to oil and gas companies, industrial operators, and utilities. Its ProStopp™ DS tool provides double block and bleed isolation. Based in Tulsa, US, the company received an investment from Apollo Global Management in June 2025.
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