Aiyuan HDPE‑EVOH double‑wall composite pipe is a specialized thermoplastic piping solution developed for underground fuel transmission at gas stations. It adopts multi‑layer co‑extrusion structure with HDPE as inner and outer structural layers and EVOH as the core barrier layer, designed for underground burial applications including fuel supply pipelines, oil‑gas recovery pipelines and tank connection pipelines. Conventional single‑wall HDPE pipes suffer from hydrocarbon permeation issues, while metal steel pipes are troubled by underground corrosion, rust and leakage risks. Buried station pipelines face complex service conditions: soil moisture, stray current, ground settlement and long‑term contact with gasoline‑based fuels place high requirements on the pipe’s barrier performance, mechanical strength, anti‑corrosion property, impact resistance and long‑term underground service stability.
Traditional piping materials show obvious limitations for buried fuel pipeline projects. Carbon steel pipes feature high mechanical strength but are vulnerable to underground electrochemical corrosion. Anti‑corrosion coating damage during transportation and installation will trigger rust, pitting and medium leakage, requiring regular anti‑corrosion maintenance and bringing high life‑cycle costs. Single‑layer HDPE pipes avoid metal corrosion problems yet lack effective hydrocarbon barrier layers. Long‑term fuel permeation will cause volatile loss of gasoline components and potential soil pollution. Common composite pipes without EVOH barrier cannot meet strict permeation‑resistance specifications of modern gas station projects. In addition, poor fusion‑joint quality of ordinary plastic pipes may lead to hidden leakage failures after burial, which are difficult to locate and repair.
This Aiyuan HDPE‑EVOH double‑wall composite pipe integrates high‑density polyethylene structural layers and EVOH barrier layer through precise co‑extrusion manufacturing process. The outer HDPE layer provides excellent anti‑aging, anti‑abrasion and soil‑stress‑resistant performance to cope with complex underground burial environments. The inner HDPE layer resists swelling and erosion from liquid fuel. The sandwiched EVOH functional layer serves as a high‑efficiency barrier against hydrocarbon molecule penetration, greatly reducing fuel volatile permeation loss.
The product supports electro‑fusion connection for on‑site assembly. Under standardized construction, electro‑fusion joints form integrated sealing interfaces, effectively lowering hidden leakage risks at connection points. Good flexibility enables the pipe to adapt to slight ground settlement and foundation deformation, avoiding brittle fracture failure. The whole pipe system is corrosion‑free and does not need anti‑corrosion coating or cathodic protection treatment required for steel pipes, simplifying construction procedures and later‑stage maintenance workload.
Manufactured under strict production control, the composite pipe is suitable for long‑term underground burial installation of new‑built gas stations and old‑station renovation projects. It can be matched with related fittings including electro‑fusion couplings, elbows and tees to form a complete buried fuel piping network. Compared with metal pipelines, it cuts overall engineering cost and reduces post‑operation maintenance investment. The stable barrier property helps control fuel volatilization loss and mitigates underground soil contamination risks.
Vohon Petrochemical supplies complete‑set composite pipe products together with matching electro‑fusion fittings. Customized dimensions are available according to project flow requirements, burial depth and site layout conditions. We deliver one‑stop services covering technical parameter communication, product manufacturing, application‑oriented technical guidance and after‑sales support. With reliable material performance and mature supporting fittings, this HDPE‑EVOH double‑wall composite pipe provides a long‑life, low‑maintenance and permeation‑resistant piping solution for buried fuel transmission systems of fuel stations.