The insulation structure of the steel jacketed steel insulation pipe is divided into: internal sliding type and external sliding type according to different sliding methods.

Internal sliding type: The insulation structure is composed of working steel pipe, aluminum silicate, drag reduction layer, microporous calcium silicate, insulation layer, stainless steel fastening steel band, aluminum foil reflective layer, polyurethane insulation layer, outer jacket steel pipe, and external anti-corrosion layer (basically no longer used).

External sliding type: The insulation structure is composed of working steel pipe, glass wool insulation and heat insulation layer, aluminum foil reflective layer, stainless steel fastening band, sliding guide support, air insulation layer, outer protection steel pipe, and external anti-corrosion layer.

Anti-corrosion layer: Protect the outer steel pipe from being corroded by corrosive substances and extend the service life of the steel pipe.

Outer protection steel pipe: Protect the insulation layer from being eroded by groundwater, support the working pipe and can bear a certain external load to ensure the normal operation of the working pipe.

Glass wool insulation and heat insulation layer, air insulation layer: Ensure the temperature of the medium and ensure that the surface of the outer protection pipe remains at normal temperature.

Aluminum foil reflective layer: Ensure that the organic foam material does not enter the inorganic hard high-temperature resistant layer; reflect part of the heat of the high-temperature resistant layer.

Inorganic hard insulation layer: Withstand high temperature, ensure the interface temperature between the inorganic hard insulation layer and the organic insulation layer, and ensure that the foam is not carbonized.

Stainless steel fastening band and sliding guide support: Ensure the free movement of the working steel pipe due to thermal expansion and contraction.

Working steel pipe: Ensure the normal flow of the conveyed medium.