{"id":4326,"date":"2025-08-05T08:34:32","date_gmt":"2025-08-05T08:34:32","guid":{"rendered":"https:\/\/www.wldsteel.com\/?p=4326"},"modified":"2025-09-01T03:35:44","modified_gmt":"2025-09-01T03:35:44","slug":"repair-standards-and-methods-or-fbe-anti-corrosion-steel-pipes","status":"publish","type":"post","link":"https:\/\/www.wldsteel.com\/de\/repair-standards-and-methods-or-fbe-anti-corrosion-steel-pipes\/","title":{"rendered":"Repair Standards And Methods For FBE Anti-corrosion Steel Pipes"},"content":{"rendered":"

Repair of FBE anti-corrosion steel pipes (Fusion Bonded Epoxy anti-corrosion steel pipes) must comply with strict standards and specifications to ensure that the anti-corrosion performance of the repaired coating matches the original coating and guarantee the long-term operational safety of the pipeline. The following details the repair standards, repair methods, and quality inspection from three aspects:<\/p>\n\n\n\n

I. Core Standards for Repair<\/strong><\/strong><\/h3>\n\n\n\n

The repair of FBE anti-corrosion coatings must refer to authoritative domestic and international standards, mainly including:<\/p>\n\n\n\n

  1. Domestic Standards<\/strong>
    1. Technical Specification for Fusion Bonded Epoxy Powder External Coating of Steel Pipes<\/em> (SY\/T 0315-2013): Clearly specifies the repair requirements for FBE coating damage, including repair materials, surface treatment, construction processes, and inspection methods.<\/li>
    2. Technical Specification for Repair of Anti-corrosion Coatings on Buried Steel Pipes<\/em> (GB\/T 5135.22-2019): Provides general regulations on the repair process and quality control of anti-corrosion coatings (including FBE) for buried pipelines.<\/li>
    3. Code for Construction of Oil and Gas Pipeline Crossing Engineering<\/em> (GB 50424-2015): Involves special requirements for damage repair of FBE pipelines in crossing sections.<\/li><\/ol><\/li>
    4. International Standards<\/strong>
      1. ISO 21809-3 Petroleum and Natural Gas Industries – Pipeline Transportation Systems – Part 3: Steel Pipe Coatings<\/em>: Puts forward internationally accepted requirements for the compatibility of FBE coating repair materials and construction processes.<\/li>
      2. AWWA C213 Standard for Fusion-Bonded Epoxy Coatings for Steel Water Pipelines<\/em>: Emphasizes the hygienic safety of materials for the repair of FBE coatings in drinking water pipelines.<\/li><\/ol><\/li><\/ol>\n\n\n\n

        II. Premises for Repair and Classification of Damage<\/strong><\/strong><\/h3>\n\n\n\n

        Before repair, it is necessary to evaluate the type and extent of damage to determine whether repair is required:<\/p>\n\n\n\n

        • Minor damage<\/strong>: Local scratches on the coating (depth \u2264 50% of coating thickness), pinholes (diameter \u2264 1mm).<\/li>
        • Moderate damage<\/strong>: Local peeling of the coating (area \u2264 100cm\u00b2), scratches with depth > 50% of coating thickness but without exposing the substrate (steel pipe not exposed).<\/li>
        • Severe damage<\/strong>: Large-area peeling of the coating (area > 100cm\u00b2), exposure of the substrate (direct exposure of the steel pipe), and steel pipe deformation caused by mechanical damage.<\/li><\/ul>\n\n\n\n

          III. Specific Repair Methods<\/strong><\/strong><\/h3>\n\n\n\n

          Repair must follow the process of “surface treatment \u2192 material selection \u2192 coating application”. The repair methods vary slightly according to the degree of damage:<\/p>\n\n\n\n

          1. Surface Treatment (Core Step)<\/strong><\/strong><\/h4>\n\n\n\n

          Regardless of the type of damage, the damaged area and the surrounding 50-100mm range must be surface-treated to ensure the substrate is clean and rough, thereby enhancing the adhesion of repair materials:<\/p>\n\n\n\n

          • Rust removal grade<\/strong>: For areas with exposed substrate (steel pipe exposed), the rust removal grade must reach Sa2.5 (near-white rust removal), which can be achieved by sandblasting; for non-substrate-exposed areas (only coating damage), it must reach St3 (thorough manual rust removal), which can be done using wire brushes, sandpaper, or power tools for grinding.<\/li>
          • Cleanliness requirements<\/strong>: Remove rust, oil, dust, and old coating debris from the surface, clean it with dry compressed air or a lint-free cloth, and ensure the surface moisture content is \u2264 4%.<\/li><\/ul>\n\n\n\n

            2. Selection of Repair Materials<\/strong><\/strong><\/h4>\n\n\n\n

            Repair materials must be compatible with the original FBE coating (chemical stability and adhesion matching) and meet anti-corrosion performance requirements:<\/p>\n\n\n\n

            • Minor damage (pinholes, shallow scratches)<\/strong>: Two-component epoxy repair paint (such as solvent-free epoxy coating) is used, with a dry film thickness \u2265 150\u03bcm (equivalent to the thickness of the original FBE coating).<\/li>
            • Moderate damage (local peeling, deep scratches)<\/strong>: Modified epoxy repair paste (paste-like, can be thickly applied) or FBE repair powder (requires heat curing, suitable for high-demand scenarios) is used, with a dry film thickness \u2265 200\u03bcm.<\/li>
            • Severe damage (substrate exposure, large-area peeling)<\/strong>: First apply an epoxy primer (dry film thickness \u2265 80\u03bcm), then apply a repair coating of the same type as the original FBE (such as high-build epoxy coating), with a total dry film thickness \u2265 300\u03bcm (not less than the thickness of the original coating).<\/li><\/ul>\n\n\n\n

              3. Coating Application<\/strong><\/strong><\/h4>\n\n\n\n
              • Manual application<\/strong>: Suitable for small-area damage (< 100cm\u00b2). Use a scraper or brush to evenly apply the repair material to the treated surface, ensuring no bubbles or sagging, and the edges transition smoothly with the original coating (avoiding steps).<\/li>
              • Heat curing<\/strong>: If FBE repair powder is used, the repair area must be preheated to 180-220\u2103 (consistent with the curing temperature of the original FBE) using a heat gun or medium-frequency heating equipment, then the powder is sprayed and allowed to cool and cure naturally.<\/li>
              • Multi-layer application<\/strong>: For areas requiring higher thickness (such as severe damage), 2-3 layers of coating must be applied, with an interval of \u2265 4 hours between each layer (after thorough drying) to avoid cracking caused by excessive thickness of a single layer.<\/li><\/ul>\n\n\n\n

                IV. Quality Inspection Standards<\/strong><\/strong><\/h3>\n\n\n\n

                After repair, the following inspections must be conducted to ensure qualification:<\/p>\n\n\n\n

                1. Appearance<\/strong>: The coating surface is flat, without bubbles, pinholes, or sagging, and connects smoothly with the original coating, with no obvious color difference.<\/li>
                2. Dicke<\/strong>: Detected with a coating thickness gauge, the dry film thickness is not less than that of the original FBE coating (usually \u2265 300\u03bcm), and the local minimum thickness is not less than 80% of the design value.<\/li>
                3. Adhesion<\/strong>: Using the cross-cut test (grid spacing 1mm, coating peeling \u2264 5% after tape peeling) or the pull-off test (adhesion \u2265 5MPa, consistent with the original coating).<\/li>
                4. Pinhole detection<\/strong>: Detected with a spark tester (voltage set according to thickness: 15-30kV for 100-300\u03bcm), with no breakdown (no sparks).<\/li><\/ol>\n\n\n\n
                  \"\"<\/figure>","protected":false},"excerpt":{"rendered":"

                  Repair of FBE anti-corrosion steel pipes (Fusion Bonded Epoxy anti-corrosion steel pipes) must comply with strict standards and specifications to ensure that the anti-corrosion performance of the repaired coating matches the original coating and guarantee the long-term operational safety of the pipeline. The following details the repair standards, repair methods, and quality inspection from three […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"\nRepair Standards And Methods For FBE Anti-corrosion Steel Pipes - API steel oilfield pipeline, casing pipe, OCTG manufacturer and supplier<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wldsteel.com\/de\/repair-standards-and-methods-or-fbe-anti-corrosion-steel-pipes\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Repair Standards And Methods For FBE Anti-corrosion Steel Pipes - API steel oilfield pipeline, casing pipe, OCTG manufacturer and supplier\" \/>\n<meta property=\"og:description\" content=\"Repair of FBE anti-corrosion steel pipes (Fusion Bonded Epoxy anti-corrosion steel pipes) must comply with strict standards and specifications to ensure that the anti-corrosion performance of the repaired coating matches the original coating and guarantee the long-term operational safety of the pipeline. 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