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 the medium temperature of steel sleeve steel steam insulation pipe is very high, generally more than 200℃, polyurethane can not be used as insulation layer like directly buried hot water pipe (because the carbonization temperature of polyurethane is about 142C). Therefore, the prefabricated directly buried steam insulation pipes of many manufacturers adopt the structure of composite thermal insulation, and the structure of composite thermal insulation can be roughly divided into two kinds of structures: internal sliding and external sliding: as a new material for heating work, directly buried steam pipes have been more and more widely used because of their fast construction progress, good thermal insulation function, low project cost, saving building materials and so on.
The super steel sleeve steel directly buried insulation pipe consists of an inner working steel pipe, an outer protective steel pipe and an intermediate insulation layer. The working steel pipe is sandblasted with two layers of antirust paint. Prefabricated directly buried heat preservation pipe hot rolled seamless steel pipe is resistant to high temperature and high pressure, suitable for medium temperature 350℃, strong anti-corrosion ability under pressure, high strength of anti-corrosion coating, not easy to destroy seamless elbow elbow is a kind of pipe fittings used at pipe bends. Epoxy fusion powder anticorrosion FBE/2FBE service life: after 40 years to 50 years, high density polyethylene jacket anticorrosion high density polyethylene jacket anticorrosion structure: made of high density polyethylene material on the outer surface of steel pipe, with extremely high mechanical strength and excellent corrosion resistance, can protect steel pipe from damage caused by external factors in the process of transportation, installation and use.
And the structural mechanism. Steel sleeve steel insulation pipe thermal insulation structure according to different sliding modes: internal sliding type and external sliding type 1, internal 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 wool 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. Structural mechanism of steel sheathed steel insulation pipe 1. Anti-corrosion coating: protect outer steel.
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It fully meets the design performance index and type selection requirements. The thermal insulation structure of directly buried steam insulation pipe adopts a variety of optimized structural forms, such as single inorganic thermal insulation material, inorganic thermal insulation material, organic thermal insulation material and reflective layer composite insulation, which can effectively improve the effect of thermal insulation and energy saving. The fixed system of directly buried steam insulation pipe adopts the form of internal fixation, which can reduce the occupied area and investment cost. The suitable medium for conveying in the pipeline is steam, its working pressure ≤ and working temperature ≤ 350℃; the comprehensive thermal conductivity of the pipeline at the operating temperature ≤, * heat loss ≤ 120W / m2; under normal conditions, the service life of the pipeline is not less than 30 years. The main structure of steel sleeve steel prefabricated thermal insulation pipe 1. Anti-corrosion coating: protect the outer steel pipe from corrosion and prolong the service life of the steel pipe. two。 External steel pipe: protect the insulation layer from groundwater erosion, support the working pipe and be able to withstand a certain external load.
+ jacket steel pipe + glass steel shell anticorrosion protective layer structure. The heat preservation treatment of all kinds of pipe joints is mature and the quality is reliable. 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 prefabricated directly buried insulation pipe at high temperature is mainly composed of four parts. (1) working steel pipe: in accordance with the requirements of the conveying medium, sewn steel pipe, seamless steel pipe and double-sided submerged arc steel sleeve steel insulation pipe industry are adopted respectively. Although the boom is low, however, the energy saving and emission reduction of steel sleeve steel insulation pipe industry has not been reduced. At the 2014 (Fifth) China Steel sleeve Steel Insulation Pipe Energy Saving and Emission reduction Forum recently held by the Metallurgical Industry Planning and Research Institute, several participants revealed that at present, waiting for