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GB/T 39636-2020 is a technical specification for the external coating of fusion bonded epoxy powder (FBE) on steel pipelines, which specifies the design, production, construction, and inspection requirements for single-layer or double-layer structural coatings.
keyword GB/T 39636 Category Anti-coating pipe standards Related products Get a quoteGB/T 39636 Epoxy Powder Coating Anti Corrosion Steel Pipe
Core Scope of Application of GB/T 39636-2020 Standard
GB/T 39636-2020 is a technical specification for the external coating of fusion bonded epoxy powder (FBE) on steel pipelines, which specifies the design, production, construction, and inspection requirements for single-layer or double-layer structural coatings. This standard is applicable to steel pipelines operating in underground or underwater environments, covering a temperature range of -30 ℃ to 80 ℃. The coating effectively prevents corrosion in complex environments.
Material properties and coating technology requirements
The standard imposes strict requirements on the chemical composition and physical properties (such as adhesion, weather resistance, and mechanical strength) of fusion bonded epoxy powder coatings, such as the coating having good impact resistance and cathodic peel resistance. The durability of coatings prepared in the laboratory needs to be verified through impact resistance tests, cathodic peel tests after bending, and other tests. Before painting, the steel surface needs to reach a specific cleanliness level and roughness parameters to ensure a tight bond between the coating and the substrate.
Construction technology and quality control
During the construction process, it is recommended to use electrostatic spraying method, and clear limits have been set for environmental parameters such as temperature, humidity, and wind speed. After the coating is completed, thickness uniformity testing and non-destructive evaluation should be carried out to ensure that there are no pores or defects. The standard also specifies the process of repair and recoating, such as using compatible materials to repair local damage, thoroughly removing the original coating and performing surface treatment again before recoating.
Differences from other anti-corrosion standards
GB/T 39636 is specifically designed for fusion bonded epoxy powder coatings, while common 3PE anti-corrosion steel pipes follow the GB/T 23257 standard, which combines a three-layer structure of epoxy powder, adhesive, and polyethylene. In addition, IPN8710、 Other anti-corrosion types such as epoxy coal tar correspond to different application scenarios and performance requirements, for example, IPN8710 is suitable for internal anti-corrosion of drinking water pipelines.
Quality Inspection and Acceptance Standards
Finished pipes need to undergo sampling inspection, including porosity testing, adhesion testing, and analysis of interface impurity contamination rate. On site joint coating construction requires the use of the same materials and processes as the main coating, and the joint coating area needs to undergo electrical spark leak detection and peel strength testing. The standard also requires the provision of complete handover documents, including material certification, construction records, and inspection reports.
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