According to the different sliding mode, the thermal insulation structure of steel sleeve and steel composite thermal insulation steel pipe can be divided into two categories: 1. The internal sliding type: the thermal insulation structure is composed of working steel pipe, aluminum silicate, drag reduction layer, microporous calcium silicate, heat insulation layer, stainless steel fastening steel strip, aluminum foil reflection layer, polyurethane insulation layer, outer steel pipe and external anti-corrosion layer. The inner sliding type thermal insulation steel pipe is composed of steel pipe with conveying medium + composite silicate or microporous calcium silicate + rigid polyurethane foam plastic + outer steel pipe + glass steel shell anticorrosion protective layer structure. The heat preservation treatment technology of all kinds of pipe joints is mature and the quality is reliable. 2. External sliding type: the thermal insulation structure is composed of working steel pipe, glass wool thermal insulation layer, aluminum foil reflective layer, stainless steel fastening steel strip, sliding guide bracket, air insulation layer, external steel pipe and external anti-corrosion layer. The construction of the insulation pipe is carried out in parallel with the on-site trenching, and only the on-site joint is needed, which can shorten the construction period by more than 50%.
1. What are the uses of steel sleeve steel insulation pipe 4. Safe and reliable. The outer steel pipe has high strength, good sealing performance, effective waterproof and tensile resistance. The steel pipe bends, triangles, bellows compensators and wide doors are arranged in steel jackets, and the whole operation line runs in a fully sealed environment, which is safe and reliable. 5. Good corrosion resistance and long service life. The internal working steel pipe adopts the anticorrosive coating of silicone high temperature resistant coating (high temperature resistant 400), which can effectively prevent the working steel pipe from corrosion and prolong the service life. The outer tube is anticorrosive with 3PE or epoxy coal tar pitch paint. The failure point pressure is more than 2000V, which can adapt to all kinds of complex soil environment, and the service life of the outer tube can reach more than 30 years.
The external fixing pier of rigid polyurethane foamed thermal insulation straight seam steel pipe manufacturer is used to fix the outer tube, and its main function is to prevent or limit the thermal displacement of the outer casing. The steel sleeve steel may have a large thermal expansion, and the stress of the elbow casing may exceed the limit, so the steel sleeve steel pipe must be equipped with external fixed pier in the project. Before the construction of the external fixed pier, it is necessary to do a good job of laying off the line to make the pipe and the fixed pier vertical
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