HDPE‑EVOH double‑wall composite pipe is purpose‑built for buried fuel transmission systems at gas stations, adopting pipe‑within‑pipe secondary containment structure with integrated EVOH barrier layer. The inner primary pipe undertakes fuel transportation, while the outer secondary pipe delivers redundant containment protection. The interlayer space supports leak monitoring function. Once the inner pipe suffers accidental damage, the outer wall can hold leaked fuel and prevent hydrocarbon liquid and vapor from seeping into soil and underground water, lowering environmental pollution risks.
The EVOH barrier layer inside the pipe delivers outstanding anti‑permeation performance against hydrocarbon fuel vapors, effectively restraining fuel vapor permeation loss, and keeps stable performance when conveying gasoline, diesel and ethanol‑blended fuels. Modified anti‑static material safely dissipates static charge generated by fuel flow during operation, avoiding static spark hazards in hazardous fuel‑transfer zones and complying with explosion‑proof safety requirements for petrol station sites.
Manufactured via multi‑layer co‑extrusion forming technology, the product features firm inter‑layer molecular bonding without delamination risk. HDPE base material provides excellent resistance against soil chemical corrosion, electrochemical corrosion and ground subsidence deformation. Unlike traditional steel pipelines, it requires no anti‑rust coating or regular anti‑corrosion maintenance work, achieving long‑term service life for underground burial scenarios.
Available in long continuous coil form, the composite pipe shows high bending flexibility. It can adapt to site layout changes and reduce the application quantity of elbow fittings. Matched electro‑fusion fittings realize molecular integrated welding between pipe and joints, forming high‑strength seamless connections and cutting potential leakage points. The whole installation process needs no open‑fire operation, shortens site construction cycle and lowers excavation engineering cost for new‑build and renovation‑expansion gas‑station projects.
The pipe system meets EN 14125 standard for underground thermoplastic piping of filling stations. It can be matched with interstitial leak‑detection modules to realize 24‑hour online leakage monitoring and early warning. Multiple specifications are supplied to cover fuel suction, pressure delivery, vapor recovery and other pipeline demands of fuel stations. Delivered with complete supporting fitting sets, it offers a reliable, low‑maintenance buried fuel piping solution for global fuel‑supply projects.
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