At the dredging site in Laizhou Bay, Yantai, two large dredgers are pumping seabed sediment through a black pipeline to a reclamation area 15 kilometers away. This seemingly ordinary pipeline, developed by Luoyang Zhengju New Materials Technology Co., Ltd., combines UHMWPE pipes with a self-designed modular float system, quietly rewriting the rules of offshore sand transport.
Traditional steel sand transport pipes face three critical flaws in marine environments: annual wear exceeding 3.5mm, weld cracking due to salt spray corrosion, and the nightmare of repairing sunken pipelines. Zhengju's UHMWPE pipes, however, boast six times the wear resistance of carbon steel (with annual wear as low as 0.58mm) and maintain 350% elongation at break even in temperature fluctuations from -40℃ to 80℃, easily withstanding . During the land reclamation project on Pingtan Island, Fujian, the pipes operated continuously for 18 months without structural damage, boosting transport efficiency by 30% compared to traditional steel pipes. "We used to replace pipes every three months; now even annual maintenance feels unnecessary," marvelled the project manager.
Zhengju's float system is equally impressive. Made of HDPE filled with solid foam, each buoy provides 2.2 tons of buoyancy. Its adjustable snap-on connections allow quick assembly of kilometre-long pipelines and easy disassembly before storms. During Typhoon "Haiyan" in 2024, traditional sunken pipes in Zhoushan Port were shattered, while Zhengju's floating pipeline survived intact after a simple shutdown. In Zhanjiang's waterway maintenance project, the intelligent monitoring module inside the floats detected a minor crack in advance, preventing a 2,000-cubic-meter daily transport disruption.
Founded in 2018, the company initially broke the monopoly of steel pipes with its 800mm-diameter UHMWPE tunnel escape pipes. By adopting chain connections and lightweight designs, it reduced single-pipe weight from 2 tons to 0.6 tons, quickly entering the central enterprise market. In 2021, Zhengju marine engineering demands, forming an interdisciplinary team to adapt its impact-resistant escape pipe technology for offshore sand transport. Today, it has built an industrial closed-loop integrating "engineering pipes + intelligent floats + full-chain services," with annual production capacity exceeding 30,000 tons. Its Luoyang Yanshi production base, equipped with AI visual inspection systems achieving 0.01mm precision in detecting pipe defects, has been awarded "Henan Provincial Intelligent Factory."
Zhengju's innovations carry ecological benefits too. The recyclable UHMWPE pipes reduce lifecycle carbon emissions by 40%, while adhesive-free float joints prevent marine pollution. In the Yellow River Delta ecological restoration project in Dongying, Shandong, its floating sand transport system precisely controlled sediment volume, balancing land creation with protecting 300 hectares of bird habitats. Currently listed as a Green Supply Chain Management Enterprise by the Ministry of Industry and Information Technology, Zhengju's 7 patents for intelligent float systems are aiding the formulation of national standards for Offshore Floating Sand Transport Pipelines.
From tunnel escape pipes to offshore sand transport arteries, Zhengju has transformed from an "engineering supplier" to an "industry-definer" in seven years. In Lingdingyang and Bohai Bay, its UHMWPE pipes and floats weave a network, outlining a new vision for efficient, safe, and sustainable marine development.
