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This standard specifies the construction requirements, quality acceptance standards, and functional tests for water supply and drainage pipeline engineering, covering the entire process of earthwork treatment, pipeline installation, anti-corrosion construction, backfilling, etc. It is explicitly required that the internal and external anti-corrosion construction of steel pipes must comply with design specifications, and specific requirements are put forward for welding processes, anti-corrosion coating quality, etc.
keyword GB/T 50268 Category Anti-coating pipe standards Related products Get a quoteGB/T 50268 Anti corrosion steel pipes for water supply and drainage pipelines
Overview of GB/T 50268 Standard
GB/T 50268 is a national standard for the construction and acceptance of water supply and drainage pipeline engineering. The current version is the 2008 version, which replaces the old version GB 50268-97. This standard specifies the construction requirements, quality acceptance standards, and functional tests for water supply and drainage pipeline engineering, covering the entire process of earthwork treatment, pipeline installation, anti-corrosion construction, backfilling, etc. It is explicitly required that the internal and external anti-corrosion construction of steel pipes must comply with design specifications, and specific requirements are put forward for welding processes, anti-corrosion coating quality, etc.
Types and execution standards of anti-corrosion steel pipes
According to GB/T 50268 and relevant industry standards, the main types of anti-corrosion steel pipes include epoxy resin anti-corrosion steel pipes, epoxy coal tar anti-corrosion steel pipes, 3PE/2PE anti-corrosion steel pipes, etc. For example, epoxy coal tar anti-corrosion steel pipes comply with GB 50268-97 (old version) and SY/T 0447-96 standards, using the "several cloth and several oil" process (such as two cloth and three oil); Epoxy resin anti-corrosion steel pipes are suitable for water and chemical pipelines according to SY/T 0457-2010 standard. 3PE anti-corrosion steel pipes comply with DIN 30670 and GB/T 23257-2009 standards and are widely used for oil and gas transportation.
Technical requirements for anti-corrosion construction of steel pipes
GB/T 50268-2008 specifies the requirements for anti-corrosion construction of steel pipes:
Surface treatment: Sandblasting rust removal must reach Sa2.5 level (GB/T 8923-1988), Substrate cleanliness;
Welding process: Welding tests must be conducted and a process manual must be prepared. Welders must hold a certificate and the weld seam must not have defects such as cracks or pores;
Construction of anti-corrosion layer: For example, epoxy coal tar needs to be layered with glass cloth, and cement mortar lining needs to comply with CECS 10:89 standard;
Environmental control: Preheating is required for welding in cold environments, and protective measures should be taken when the relative humidity exceeds 90% or the wind force exceeds level 5.
Quality Acceptance and Testing Specification
GB/T 50268-2008 emphasizes mandatory clauses for quality acceptance, including:
Functional test: The pipeline needs to undergo a closed water test, and the water leakage of the inverted siphon pipe after filling must meet the calculated value;
Anti corrosion layer testing: Measure the thickness of the anti-corrosion layer one by one, and the acceptance criteria must meet the design and specification requirements;
Material inspection: Backfilling materials need to be sampled and tested, and mortar test blocks need to be made according to specifications when building well chambers;
Weld inspection: Ultrasonic, eddy current, or magnetic flux leakage testing is used to ensure that there are no defects such as incomplete fusion or undercutting in the weld.
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