Jacket insulation spiral steel pipes include black jacket insulation spiral steel pipes and yellow jacket insulation spiral steel pipes.

Jacket insulation spiral steel pipe, raw materials mainly include seamless steel pipe and seamless steel pipe.

The raw materials for the yellow jacket insulation spiral steel pipe package mainly include seamless steel pipes and seamless steel pipes. The common thermal insulation material of polyurethane thermal insulation spiral steel pipe of yellow jacket is rigid polyurethane foam plastic, and the applicable temperature is -185~120 ℃. This material has a soft texture. To improve its strength, a high-density polyethylene layer is added outside the insulation layer to form a composite structure to prevent groundwater from seeping into the insulation layer.

The structure of the yellow jacket insulation spiral steel pipe package mainly includes a working steel pipe layer, a polyurethane insulation layer, and a high-density polyethylene protective layer. The outermost layer is covered with black or yellow polyethylene plastic material prefabricated to a certain wall thickness. Black ones are called black jacket insulation pipes, while yellow ones are called yellow jacket insulation pipes. Its functions are twofold: firstly, to protect the polyurethane insulation layer from mechanical damage caused by hard objects; secondly, to prevent corrosion and waterproofing. High density polyethylene polyurethane foam insulation spiral steel pipe shall comply with the SY/T114-2000 and SY/T115-2001 standards.

The black jacket insulated steel pipe bag includes spiral steel pipes, straight seam steel pipes, and seamless steel pipes. The outer layer made of black polyethylene material is called a black jacket insulation pipe. A high-pressure foaming machine is used to inject the original liquid of rigid polyurethane foam into the cavity formed between the steel pipe and the outer protective layer at one time, and then polyethylene is used to treat the surface of the steel pipe to form the outermost protective layer.

Polyethylene shell directly buried insulation pipe High density polyethylene insulation pipe directly buried prefabricated insulation pipe is closely combined with steel pipe conveying medium, polyurethane rigid foam insulation layer and high-density polyhexene outer casing pipe. The directly buried insulation pipe is mainly used for urban central heating pipe network, oil transmission pipeline, water transmission pipeline in cold regions and industrial pipeline engineering in production areas. As the polyurethane rigid foam insulation layer is closely bonded to the outer skin of the steel pipe, it can isolate the infiltration of air and water and play a good anti-corrosion role. At the same time, its foam pores are all closed, and its water absorption is very low. The high-density polyethylene shell and fiberglass shell both have good anti-corrosion, insulation, and mechanical properties.