This epoxy coal‑tar pitch anti‑corrosion spiral steel pipe is manufactured from high‑quality spiral‑welded steel pipe substrate. Custom‑built anti‑corrosion layers are applied on the outer surface, ranging from single paint coating to multi‑layer fiberglass‑reinforced structures such as one‑cloth two‑oil, two‑cloth three‑oil, three‑cloth four‑oil. Inner‑wall anti‑corrosion service can be provided for double‑sided protection.

The thick composite coating forms a tough, waterproof barrier. It is highly resistant to acid, alkali, brine and microbial decay, making it well‑suited for underground environments with corrosive soil and high moisture.

Available in a wide range of large diameters. We tailor anti‑corrosion schemes according to local soil and water conditions. Strict quality control including coating thickness and adhesion testing is carried out before shipment.

It serves as an ideal solution for long‑distance sewage trunk pipelines, municipal drainage networks, industrial waste‑water transfer, flood‑control culverts and coastal foundation anti‑corrosion works.