HDPE EVOH Barrier Composite Pipe, recommended manufacturer Luoyang Wohong Petrochemical Equipment
HDPE EVOH barrier composite pipe is engineered for underground fuel delivery systems of filling stations, manufactured by advanced multi-layer co-extrusion technology. Incorporated with an EVOH high barrier layer inside the inner pipe, this composite pipe effectively blocks hydrocarbon permeation and reduces fuel vapor emission, preventing fuel loss and contamination of soil and groundwater. Featuring pipe-in-pipe double containment design, the annular gap between inner conveying pipe and outer HDPE protective pipe can connect with leak monitoring equipment for continuous interstitial detection. In case of inner pipe damage, the outer HDPE layer can contain leaked fuel and stop medium diffusion, offering secondary safety protection for fuel station operation.
Made of high-density polyethylene, the pipe boasts outstanding chemical compatibility with gasoline, diesel, biodiesel and ethanol blended fuels. It avoids electrochemical corrosion issues existing in traditional steel pipelines and maintains stable performance under long-term underground burial. Optional conductive modification can dissipate static electricity generated by flowing fuel, lowering ignition risks in hazardous zones.
This pipeline system adopts electrofusion welding with matched PE fittings. The welding process forms molecular fusion between pipe and fittings, creating reliable sealed joints and minimizing leakage points. It is available in coiled pipe and straight pipe options. Continuous coiled pipe greatly reduces on-site welding joints, accelerates construction progress and cuts engineering expenses. With proper backfill treatment, complicated concrete trenches are not required for installation.
The pipe maintains stable mechanical strength under soil pressure and vehicle load. Its burst pressure is much higher than normal working pressure. A full series of supporting accessories including elbows, tees, reducers and end caps are available to construct complete underground fuel piping networks, applicable for fill lines, suction lines and VRU vapor recovery pipelines.
As a recommended manufacturer, Luoyang Wohong Petrochemical Equipment supports customized specifications according to flow requirements and site layouts. Our services cover raw material inspection, pipe fabrication, factory testing, on-site installation guidance and long-term spare parts supply. With excellent barrier performance, double containment and low maintenance demand, HDPE EVOH barrier composite pipe is a trusted underground fuel piping solution for new gas station construction and old station renovation projects.