T/HBAS 007-2021 Code for engineering specifications of multi-layer enhanced steel and plastic composite pipe for water supply and drainage

Scope

Scope: This document specifies the terms and definitions, symbols, classification and marking, materials, pipe system design, pipe engineering construction, pipe functional testing, and completion acceptance for multi-reinforced steel-plastic composite pipes for water supply and drainage. This document is applicable to the design, construction, and acceptance of water supply pipe systems and drainage pipe systems for new construction, renovation, and expansion projects, with a long-term working temperature not exceeding 40°C and a maximum working pressure (MOP) not exceeding 1.25 MPa, used for urban water source transmission, seawater desalination, municipal water supply, and irrigation, as well as drainage pipe systems for rainwater and wastewater with a transmission medium temperature not exceeding 45°C. For pipes transporting corrosive media, they can also be referenced and applied within the scope of the corrosion resistance allowed by polyethylene materials. Main technical content: Multi-reinforced steel-plastic composite pipes are made from high-density polyethylene (HDPE) plastic, cold-rolled carbon steel strips (such as Q195, Q215), and high-quality carbon steel (steel 45) steel nets as raw materials. They are processed into composite strips by continuous extrusion, and then wound and welded with plastic. They can be used for the transformation and construction of water supply and drainage pipe networks, the construction of seawater desalination transmission pipe networks, and the transmission of special fluids. Due to the introduction of steel strips and steel nets, they bear most of the internal pressure loads of the pipes, greatly reducing the wall thickness of the pipes and reducing the use of non-renewable resources - polyethylene, saving enterprise production costs and social resources. The pipes combine the good corrosion resistance of PE pipes, reduce seepage and secondary water pollution caused by corrosion, are environmentally friendly and green,

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