Multi‑layer co‑extruded HDPE‑EVOH composite pipe is engineered for underground fuel conveyance systems of gas stations, manufactured by integrated multi‑layer co‑extrusion molding process. The structure combines high‑density polyethylene substrate and EVOH barrier layer, forming a compact molecular bond between each material layer without delamination risk during long‑term service.
The embedded EVOH barrier layer offers outstanding resistance to hydrocarbon vapor permeation. It effectively cuts down fuel vapor permeation loss when transporting gasoline, diesel and ethanol‑blended fuels, reducing resource waste and ground environmental pollution. Modified anti‑static formula dissipates static charge generated by high‑speed fuel flow inside the pipeline, preventing static spark hazards and satisfying explosion‑proof requirements for fuel‑handling sites.
HDPE base material endows the pipe with superior mechanical performance, resisting soil chemical corrosion, electrochemical erosion and ground subsidence deformation. Different from conventional steel pipelines, it requires no regular anti‑rust coating or anti‑corrosion maintenance, realizing long service life under buried underground conditions.
Available in continuous coil and straight pipe forms, the composite pipe features good bending flexibility. It adapts to complicated site layouts of newly‑built or renovated gas stations and reduces the application quantity of elbow fittings. Matched electrofusion fittings create molecular‑level fusion connections between pipe and fittings. The welded joints are high‑strength and leak‑tight, and the whole installation procedure needs no open‑fire work, shortening on‑site construction cycle and cutting excavation engineering costs.
This composite piping system conforms to EN 14125 standard for thermoplastic underground pipelines at filling stations. For double‑containment working conditions, it can be configured as pipe‑within‑pipe structure with interlayer space for interstitial leakage monitoring. Various specifications are provided to cover fuel suction, pressure delivery and vapor recovery pipeline requirements. Complete supporting fitting kits are supplied together, providing stable and cost‑effective underground piping solutions for global fuel station projects.