2 structural characteristics and main performance parameters of steel jacket steel directly buried steam pipe the steel sleeve steel directly buried steam pipe is composed of working steel pipe, heat insulated inner rolling bracket, main insulation layer, air layer, outer casing and outer pipe anti-corrosion coating, its structure is shown in the following figure: (1) the rolling bracket fixed on the inner working pipe and the inner wall friction of the outer casing are adopted.
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Pipe prefabricated steam steel sleeve steel insulation pipe can also be made of graphite, silicon calcium shell and filled polyurethane foam. According to the different sliding mode, the thermal insulation structure of steam insulation pipe factory is divided into: inner sliding type and external sliding type 1, inner sliding type: 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 reflective layer, polyurethane insulation layer, outer steel pipe and external anti-corrosion layer. 2, external sliding type: the thermal insulation structure is composed of working steel pipe, glass cotton thermal insulation layer, aluminum foil reflective layer, stainless steel fastening belt, sliding guide bracket, air insulation layer, external steel pipe and external anti-corrosion layer. At 350 ℃ is as follows. Heat supply pipe steel sleeve steel insulation pipe
The so-called upper drainage is a drainage device in which the condensed water in the pipe is inserted into the drain pipe in the working steel pipe, and the condensed water in the collecting tank is discharged from the top of the pipe by using the back pressure in the pipe. Its structure can be seen in the drawing. This structure is convenient to install during construction. Pipe fittings are made in the manufacturer, and Xian field can be installed directly. And because the leading point of the drain pipe is above the pipe, the special steel sleeve steel insulation steel pipe for conveying high temperature hot water is more convenient for welding and installation. Because it is close to the ground, the drainage well can be set relatively shallow, which is very convenient for future maintenance and operation, but also reduces the workload of civil construction and reduces the project cost. Light weight. ? Steel sheathed steel insulation pipe is composed of steel pipe conveying medium, anticorrosive jacket steel pipe and ultra-fine glass cotton filled between steel pipe and jacket steel pipe. It can also be made of graphite, calcium silicate shell and filled polyurethane foam.
The high temperature resistance of steel sleeve steel directly buried insulation pipe can not be compared with other external protection pipe. In order to ensure that the groundwater level is high and that the groundwater does not affect the normal operation of the steam directly buried pipeline, the outer protective layer * uses a tight and strong steel pipe shell. Anti-corrosion coating: in order to prolong the service life of the steel pipe and protect the outer steel pipe from corrosion. External protection steel pipe: in order to ensure the normal operation of the directly buried thermal insulation pipe, protect the insulation layer from the erosion of groundwater, support the working pipe and bear a certain external load. Polyurethane foam layer of steel sleeve and steel directly buried insulation pipe: the purpose is to ensure the temperature of the medium and the surface of the outer protection tube to maintain normal temperature. Barrier and reflective layer: the purpose is to ensure that the organic foam material will not enter the inorganic hard high temperature resistant layer.
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Structural type of thermal insulation fixed joint: high density polyethylene outer protective pipe polyurethane foam prefabricated directly buried thermal insulation fixed joint. Under the working condition, the surface temperature of the external protection pipe at the fixed joint is ≤ 30 ℃, the thermal insulation material of the fixed joint and the specification size, anti-corrosion requirements and mechanical properties of the working steel pipe and the external protection steel pipe are the same as the prefabricated directly buried hot water insulation pipe. Ningbo DN200 steel sleeve steel prefabricated thermal insulation pipe