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    A comprehensive enterprise integrating production and sales


    21

    2022

    -

    09

    Production technology and application of epoxy coal tar anti-corrosion steel pipe

    The author:


    The production process and use of epoxy coal tar pitch anti-corrosion steel pipe; the three-layer PE production process of epoxy coal tar pitch anti-corrosion steel pipe: at the beginning of production, first use the test pipe section to adjust the preheating temperature and the thickness of the anti-corrosion layer in turn on the production line. Production can start only after all parameters meet the requirements.

    1. Use a heat source to heat the steel pipe to a suitable temperature.

    2. The epoxy powder coating is evenly applied to the surface of the steel pipe.

    3. The coating of the adhesive is carried out during the gelling process of the epoxy powder.

    4. The polyethylene layer can be coated by longitudinal extrusion process or lateral winding process. For steel pipes with a nominal diameter greater than 500mm, the lateral winding process should be adopted.

    5. When the lateral winding process is used, it should be ensured that the polyethylene in the overlapping part and the polyethylene on both sides of the weld are completely rolled and compacted, and the surface of the polyethylene is prevented from being crushed; when the longitudinal extrusion process is used, the two sides of the weld are not A void should appear.

    6. After the polyethylene layer is coated, it should be cooled with water until the temperature of the steel pipe is not higher than 60℃. The interval between the application of epoxy powder and the start of cooling of the anti-corrosion coating should ensure that the fusion-bonded epoxy coating is fully cured.

    7. After the anti-corrosion coating is completed, the polyethylene layer at the end of the pipe should be removed. The reserved length of the pipe end is 100mm to 150mm, and the end face of the polyethylene layer should form a chamfer of less than or equal to 30°. 4.8 After the pipe end is treated, according to the user's requirements, the surface of the bare steel pipe can be painted with anti-rust and weldable coating. Anti-rust weldable paint should be applied according to the product specification. The application of epoxy coal tar pitch anti-corrosion steel pipe is very extensive, and the performance after drying is also very good, but it is easy to deteriorate due to high temperature or humidity during storage and use. Therefore, it should be kept away from heat sources or open flames before it is dried and formed, and it should not be exposed in a humid environment. Its application in underground oil pipelines is very common. For example, epoxy coal tar pitch anti-corrosion steel pipe is a pipeline facility with steel pipe and epoxy coal tar pitch coating as the main structure. It is a relatively common underground oil pipeline.

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