Aiyuan HDPE‑EVOH double‑wall composite pipe adopts advanced multi‑layer co‑extrusion forming technology, specially developed for underground fuel transmission systems of gas stations. This piping solution integrates structural HDPE layers, high‑performance EVOH barrier layers and adhesive tie layers into one integral structure, solving the long‑standing pain points of fuel permeation, soil pollution and pipeline corrosion for traditional metal and single‑wall plastic pipelines.
The double‑wall pipe‑in‑pipe design realizes secondary containment protection. The inner primary pipe undertakes fuel conveying task, while the outer secondary containment pipe forms an interstitial monitoring cavity. Once the inner pipe is damaged, leaked fuel will be trapped inside the interlayer instead of seeping into surrounding soil and groundwater, supporting real‑time leak detection and early warning for gas station underground piping systems. The EVOH barrier layer embedded inside the inner pipe delivers outstanding hydrocarbon‑blocking performance, greatly reducing gasoline and diesel vapor permeation loss, cutting down volatile organic compound emissions and complying with strict international environmental protection requirements for fuel station infrastructure.
Manufactured through precise multi‑layer co‑extrusion process, each material layer achieves stable molecular bonding via dedicated tie‑resin. It effectively avoids inter‑layer delamination caused by long‑term fuel immersion, temperature cycling and underground ground stress. The main structural layers adopt high‑grade HDPE raw materials, bringing excellent chemical resistance against gasoline, diesel, ethanol‑blended fuel and various soil corrosive substances. Different from steel pipelines, composite pipes will not rust or pit after long‑term underground burial, securing long‑term operational stability for gas station projects.
This fuel pipeline features good flexibility and can be supplied in long continuous coils. It greatly reduces the quantity of field joints and lowers hidden leakage risks brought by on‑site connections. Supporting matched electro‑fusion fittings, it forms a reliable integral piping system during site installation. Anti‑static modification treatment is available to dissipate static charge generated by fuel flowing inside pipes, satisfying explosion‑proof safety requirements of fuel‑hazardous areas at gas stations.
It covers a complete range of standard diameters to fit new‑built gas station construction, old‑station renovation and expansion projects. The whole piping system is capable of working stably under varied underground temperature and geological conditions. Compared with conventional piping options, HDPE‑EVOH double‑wall composite fuel pipeline lowers later‑stage maintenance workload, extends service cycle and delivers comprehensive benefits in safety, environmental protection and whole‑life‑cycle cost control for gas station fuel conveying networks. When selecting underground fuel pipelines for gas station projects, multi‑layer co‑extrusion HDPE‑EVOH double‑wall composite pipe has become a preferred technical option, balancing anti‑seepage performance, safety reliability and engineering practicability.