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AWWA C222 is a technical standard developed by the American Water Works Association (AWWA) specifically for the polyurethane coating and lining of steel pipes and fittings, suitable for underground or underwater water pipeline systems.
keyword AWWA C222 Category Anti-coating pipe standards Related products Get a quoteAWWA C222 internal and external polyurethane coating and lining anti-corrosion steel pipe
Definition and Scope of Application of AWWA C222 Standard
AWWA C222 is a technical standard developed by the American Water Works Association (AWWA) specifically for the polyurethane coating and lining of steel pipes and fittings, suitable for underground or underwater water pipeline systems. This standard specifies the performance requirements for polyurethane materials, including the composition of coating systems, surface treatment, construction processes, and testing methods. Its core goal is the corrosion resistance and service life of steel water pipes in complex environments, especially suitable for high hygiene requirements such as drinking water transportation.
Technical requirements for polyurethane coating
According to AWWA C222 standard, the polyurethane coating of anti-corrosion steel pipes should use thermosetting aromatic polyurethane materials (such as a mixture of MDI resin and polyols), and strictly follow the material ratio and construction specifications. The coating system must meet indicators such as adhesion, wear resistance, and chemical corrosion resistance, for example, adhesion must be greater than 10.4MPa, and the coating thickness must be uniform and defect free. The standard also specifies the specific processes for factory prefabrication and on-site construction, including shot blasting rust removal, preheating temperature control (usually 200 ° C-220 ° C), and coating curing conditions to ensure a tight bond between the anti-corrosion layer and the steel pipe substrate.
Practical Engineering Applications and Product Examples
Corrosion resistant steel pipes that comply with AWWA C222 standards are widely used in water transmission projects worldwide. For example, polyurethane coated steel pipes produced by enterprises such as Cangzhou Youqing Pipeline Co., Ltd. and Hebei Yuanhai Pipeline Equipment Co., Ltd. have been exported to multiple countries such as Argentina, Canada, and New Zealand for municipal water supply, sewage treatment, and industrial fluid transportation. A typical case includes a steel pipe in a water transmission project in the United States that uses socket and lap welding technology. The external anti-corrosion layer is constructed according to AWWA C222 standard, effectively controlling the ring deformation of the pipeline (≤ 2%) and extending its service life. This type of product is usually labeled as "3PE anti-corrosion steel pipe" or "TPEP anti-corrosion steel pipe", which combines the adhesion of epoxy powder with the mechanical strength of polyethylene.
Collaborative application with other anti-corrosion standards
In engineering practice, AWWA C222 is often used in conjunction with standards such as AWWA C210 (liquid epoxy coating) and AWWA C214 (tape anti-corrosion). For example, water supply steel pipes may be lined with cement mortar (AWWA C205 standard) to enhance stiffness and coated with polyurethane (AWWA C222) for dual protection. In addition, the standard also refers to international standards such as DIN 30670 and SY/T 0447, forming a full process technical system covering materials, design, construction, and acceptance, especially suitable for anti-corrosion treatment of large-diameter (219-3200mm) spiral welded pipes.
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