This layer, applied around the exterior of a pipeline to provide insulation and heat insulation, generally consists of the following components:
1. Anticorrosion Layer: Two coats of anti-rust paint are applied to the outer surface of the pipeline.
2. Thermal Insulation Layer: A layer of thermal insulation and heat-insulating material;
3. Moisture-Proof Layer: This layer prevents moisture from entering the thermal insulation layer. Typically, this layer is wrapped with felt and has asphalt mastic applied to the seams. This layer is typically used for cold pipes.
4. Protective Layer: This layer protects the thermal insulation layer from damage. Typically, this layer is made of glass cloth wrapped around the protective layer.
5. Coloring Layer: This layer is painted a specific color to distinguish the fluid within the pipeline.
The purpose of corrosion protection is to isolate the metal surface of the pipeline from the corrosive environment, extend the life of the pipeline, and prevent leakage; reduce the heat loss of the medium in the pipeline (such as steam, hot water), or reduce the external heat transfer to the low-temperature medium (such as chilled water); maintain the medium temperature to meet process requirements or prevent the medium from solidifying.

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