HDPE‑EVOH double‑layer composite pipe is specially developed for buried fuel transmission systems of gas stations, adopting advanced multi‑layer co‑extrusion forming technology. The inner pipe integrates an EVOH barrier layer, delivering outstanding hydrocarbon‑resistant anti‑permeation performance to block fuel vapor permeation effectively. The double‑wall “pipe‑in‑pipe” structure realizes secondary containment, and the interlayer space supports interstitial leak monitoring. If the inner primary pipe occurs accidental leakage, the outer HDPE layer can contain leaked fuel and avoid soil and groundwater contamination, greatly improving underground operation safety.
Made of high‑density polyethylene base material, this underground fuel pipeline features excellent corrosion resistance against soil moisture, chemical substances and various fuel media. It is compatible with gasoline, diesel, biodiesel and ethanol‑blended fuels. Different from traditional metal pipelines, it eliminates electrochemical corrosion risk and extends service life for long‑term buried application. Conductive modification is optional for static dissipation, preventing static accumulation generated by fast‑flowing fuel inside the pipeline and lowering hidden dangers in fueling sites.
The composite pipe supports electrofusion connection with matching PE fittings. Electrofusion welding forms integral molecular bonding between pipe and fittings, ensuring reliable tightness of each joint and reducing potential leakage points. Available in continuous coil and straight pipe forms, it brings flexible laying, shortens construction period and lowers site installation cost compared with rigid metal pipes. No complicated concrete trench is required under proper backfill conditions, adapting to new‑build gas station projects and old station reconstruction & expansion scenarios.
The pipeline system works stably within wide temperature range and maintains good mechanical strength under external soil pressure and ground traffic load. Strict production control guarantees burst pressure far higher than normal working pressure. Complete sets of supporting fittings are supplied together to build a whole underground fuel delivery network covering fill lines, suction lines, vapor recovery pipelines and related branches.
Compared with single‑layer HDPE pipe, the EVOH barrier solves the pain point of hydrocarbon permeation. It cuts fuel loss caused by underground vapor escape and meets strict environmental protection requirements for fuel station sites. Customized specifications are available for different flow rate and layout demands, delivering a safe, low‑maintenance and long‑life solution for buried fuel transmission of petrol stations.