Anti‑static HDPE‑EVOH double containment pipe is specially developed for underground fuel pipeline systems of gas stations. It adopts a dual‑layer pipe‑within‑pipe structure, with the inner pipe serving as the primary conveying layer for gasoline, diesel and ethanol‑mixed fuels, and the outer pipe acting as secondary containment barrier. The interlayer cavity is reserved for interstitial leakage monitoring. In case of inner pipe damage, the outer containment layer can intercept leaked fuel effectively, preventing hydrocarbon liquid and vapor from infiltrating soil and groundwater to avoid underground environmental contamination.
Built‑in EVOH barrier layer delivers exceptional hydrocarbon vapor‑resistant performance, which greatly suppresses fuel permeation loss and maintains stable barrier performance against various fuel products. Modified anti‑static raw material can continuously dissipate static electricity generated by high‑speed fuel flow inside the pipeline, eliminating static spark risks in flammable fuel‑transfer areas and meeting site explosion‑proof specifications for filling stations.
Manufactured through multi‑layer co‑extrusion technology, the pipe achieves tight molecular bonding between different material layers without delamination risk. The HDPE substrate provides excellent resistance to soil corrosion, electrochemical erosion and ground settlement deformation. Compared with traditional steel pipelines, it needs no periodic anti‑rust coating and corrosion maintenance, securing long‑term service life for buried installation conditions.
Supplied in continuous coil form, the pipe possesses favorable bending flexibility, which adapts to complex‑layout station sites and reduces the usage of elbow fittings. Matching electrofusion fittings realize molecular‑level fusion welding between pipe body and joints, forming high‑strength integrated joints and minimizing potential leakage points. The whole installation process requires no hot‑work operation, shortening on‑site construction period for both new‑built and reconstruction‑expansion gas‑station projects and lowering excavation‑related engineering costs.
This pipeline system complies with EN 14125 standard for thermoplastic underground piping at filling stations. It can cooperate with interstitial leak detection modules to realize 24‑hour real‑time leakage monitoring and early‑warning. Multiple available specifications cover fuel suction, pressure delivery and vapor recovery pipeline demands. Complete sets of supporting fittings are provided together, delivering a low‑maintenance and reliable buried fuel piping solution for global fuel supply projects.