3. Flange pressure rating should match the working pressure pipeline phase. Second plastic composite pipe flange connection site shall meet the following requirements: 1. plastic composite pipe cut pipe shall comply with the requirements of this Regulation 6.2.1; 2. at the scene when the mating flange steel skeleton composite pipe steel pipe should be used in the internal carotid lined steel pipe flanges with convex; 3 should be twisted thread sealing pipe thread wear-resistant steel pipe steel pipe series on plastic composite pipe is connected, the tooth type should be consistent with existing national Standard "with thread sealing pipe thread" requirement GB / T7306; and (4) stand production and installation. ① hanger production, prohibited the use of gas cutting and welding for the next feeding, blowing eyelets. Hangers hold cards should make close contact with the pipe. Hangers should be uniform corrosion, paint flow phenomenon should not occur. ② based in the walls, columns and beams and hanger bracket steel pipe, the holes should be embedded or set aside at the time of the construction of civil works, not any holes buried, to avoid damage to the building or waterproof layer. Last resort should obtain the consent of the relevant departments, conditions should be possible to adopt bolt or nail fixation. Steel skeleton composite pipe steel pipe _ Golden Link Pipe Industry (certified) _ steel pipe provided by the Hebei Golden Link Pipe Industry Co., Ltd .. Hebei Golden Link Pipe Industry Co., Ltd. (www.hbjinlingpipes.com/) Hebei Hengshui, chemical products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders in Jinling staff warmly welcome all inquiries negotiations to create the Golden Link Pipe a better future.