Abstract:

This study presents the development of a novel non⁃metallic， multilayer composite pipeline designed for hydrogen transport. Constructed primarily from high⁃molecular⁃weight polyethylene， the pipeline features a four⁃layer structure： an inner tube， a barrier layer， a reinforcement layer， and an outer protective layer. This design effectively mitigates hydrogen embrittlement， a critical limitation of metallic pipelines， while simultaneously overcoming the low⁃pressure resistance and high gas permeability of conventional polymers. The inner and outer layers are composed of polyethylene resin， the barrier layer combines aluminum foil with a blend of ethylene⁃vinyl alcohol copolymer and modified linear low⁃density polyethylene， and the reinforcement layer consists of high⁃tenacity polyester yarn. The resulting structure exhibits high mechanical strength， excellent flexibility for coiling， superior barrier properties， and long⁃term durability. This work provides a safe， efficient， and lightweight pipeline solution that supports the growing infrastructure needs of the hydrogen energy sector.

Key words: polyethylene, hydrogen transport, composite material pipe, modification