HDPE/EVOH composite fuel pipeline equipped with imported PE electrofusion fittings constitutes a complete underground fuel transport system tailored for gas station projects. Manufactured by multi‑layer co‑extrusion technology, the composite pipe combines high‑strength HDPE structural layers, adhesive tie layers and high‑barrier EVOH functional layers. The EVOH barrier layer provides excellent resistance to hydrocarbon permeation, effectively restraining vapor leakage of gasoline, diesel and ethanol‑mixed fuels, curbing VOCs emission and preventing soil and groundwater contamination, which conforms to international environmental and safety specifications for fuel facilities.
Imported PE electrofusion fittings act as key connecting components of the whole pipeline system, covering couplers, elbows, tees, reducers and saddle tapping fittings. Produced from high‑grade virgin PE material, these fittings embed precision resistance wire coils inside sockets. When connected to a dedicated electrofusion welder, controlled electric heating melts the inner wall of fittings and the outer surface of pipes. A homogeneous molecular‑bonded joint forms after natural cooling, whose mechanical performance is equivalent to or higher than that of the pipe body. This structure avoids hidden leakage risks existing in threaded, flanged and mechanical compression connections.
Each imported electrofusion fitting is printed with standard barcodes storing preset welding parameters such as voltage, heating time and cooling period. Supported electrofusion equipment can automatically identify barcode information to perform standardized welding procedures, greatly lowering on‑site manual operation errors. Welding data can be archived for quality traceability, facilitating project acceptance and long‑term operational management of gas stations.
Supplied in long continuous coils, HDPE/EVOH composite fuel pipelines reduce the number of field joints. Paired with imported PE electrofusion fittings, the total risk points of on‑site leakage are substantially decreased. The pipe material features superior chemical resistance against fuels and underground corrosive substances, free from rust, pitting corrosion and stress cracking found in conventional metal pipelines. For double‑wall containment type, the interlayer cavity can work with leak detection devices to trigger early warning once inner pipe damage occurs, realizing secondary containment protection for underground fuel piping.
The integrated system satisfies explosion‑proof requirements for hazardous fuel areas. Anti‑static treatment is optional to release static electricity generated by internal fuel flow. Multiple standard diameters are available to adapt to new gas station construction, reconstruction and expansion projects. Installation can be carried out within narrow trenches without large‑scale construction space. Matching HDPE/EVOH composite pipes with imported PE electrofusion fittings ensures good compatibility between pipe body and connectors, prevents fusion performance mismatch, cuts later‑stage maintenance and prolongs the service life of underground fuel transmission networks. It serves as a dependable solution for gas‑station underground fuel piping engineering worldwide.