Duphil Inc

Duphil Inc. specializes in pipeline construction for the energy‑infrastructure market. Based at 75850 Rosedale Rd, Rosedale, LA 70772, United States, the company leverages more than five decades of experience to deliver projects that range from modest line extensions to large‑diameter installations up to 42 inches. Their capabilities include class changes, re‑routes, encroachments, casing extensions, marsh and wetland crossings, work within congested utility corridors, trenchless techniques, and constructability evaluations and planning.

The firm works with a variety of pipe materials—steel, HDPE, and concrete‑coated pipe—to transport oil, natural gas, natural gas liquids, chemicals, refined fuels and other petroleum derivatives. Duphil’s teams have completed over 1,000 projects for more than 70 energy‑infrastructure clients, handling diverse terrains and regulatory environments across the United States.

Founded in 1968 and now operating from a division office in Rosedale, the privately held company emphasizes integrity,