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Fix the working pipe on the outer steel pipe in a certain form, and make full use of the strength of the outer protective pipe and the friction between the external protective pipe and the soil to further fix the inner tube. Without reinforced concrete fixation, the use of reinforced concrete fixed piers can be saved. Only with steel pipe as external protection pipe can internal fixation be used. There are thermal insulation facilities at the fixed end to reduce the thermal bridge effect. At the same time, the external protection pipe must have a certain strength. In order to meet the requirements of horizontal thrust of the pipeline, it has great advantages to adopt internal fixation structure for steel sleeve steel insulation structure.
Product structure of buried steam insulation pipe (external sliding): core tube (working steel pipe), silicone high temperature resistant paint, sliding bracket, high temperature resistant glass wool, aluminum foil reflective layer, air insulation layer, outer steel pipe, wound FRP anti-corrosion coating (or epoxy coal tar paint anti-corrosion layer). Steel jacket steel jacket steel insulation pipe factory prefabricated directly buried steel sleeve steel high temperature steam insulation pipe is a new laying technology in underground directly buried pipe. Bole Steel sleeve Steel Steam directly buried Insulation Pipe Plant-1. Anti-corrosion coating: protect the outer steel pipe from corrosion and prolong the service life of the steel pipe. two。 External protection of steel pipe: protect the insulation layer from groundwater erosion and support the work.
Henan large diameter steel sleeve steel insulation pipe specification: 1. The high temperature of the steam pipe will lead to the expansion of the insulation layer, and the air layer can protect the insulation layer from being destroyed when the working pipe and the outer protection pipe slide relatively. Steel sleeve steel insulation pipe is a commonly used and easy-to-use steam insulation pipe product. Its unique structure makes the thermal insulation performance of the pipe very good, but the steel sleeve steel insulation pipe and insulation layer outside the steel pipe has a small air layer, many customers do not know what to do. What is the air layer of steel sleeve steel steam insulation pipe used for?
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When the polyurethane insulation tube is heated and expanded, it must move differently, and it is also possible to produce displacement phenomenon, and the insulation structure layer and the outer tube are generally a kind of whole structure. External fixation means that the working steel pipe and the external protection pipe must be fixed together, and two large reinforced concrete piers must be set up at both ends of each section of the pipe and the compensator, so it is good to ensure the inconvenience of the pipeline. Because of the need for reinforced concrete piers for external fixation, the construction occupies a large area, the investment is large, and the construction period is sometimes long, so it is better to pay attention to it before. According to the difference of the outer protection pipe that you want to use, it can be divided into plastic jacket steel structure, FRP sleeve steel structure and steel sleeve steel structure. It has been proved by practice that the plastic sheathed steel structure can no longer adapt to the development trend of directly buried steam pipeline.
Steam directly buried polyurethane composite prefabricated insulation pipe for conveying steam. Buried rigid polyurethane foam anticorrosion and thermal insulation pipes used in oil and so on. There are many names such as polyurethane buried pipe, polyurethane prefabricated pipe, polyurethane directly buried prefabricated pipe, polyurethane jacket pipe, polyurethane foam insulation pipe and so on. According to the different sliding mode, the thermal insulation structure of steel sleeve steel insulation pipe is divided into inner sliding type and external sliding type. 1. The inner sliding 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 (basically no longer in use). 2. The external sliding 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.
