Steel-sheathed steel foam insulation pipe This product is non-toxic, harmless and non-polluting. One is a combination of steel pipes conveying medium, anti-corrosion outer steel pipes and superfine glass wool filled between steel pipes and outer steel pipes. It can also be compounded by graphite, silicon-calcium tile shell and filled polyurethane foam. Aluminum silicate composite steel sleeve steel insulation pipe is composed of working steel pipe, insulation layer, rolling guide pipe support, outer sleeve (steel pipe) and anti-corrosion layer. The insulation material is bound on the working steel pipe, and the rolling guide pipe support is integral thermal expansion and movement in the outer sleeve, so the insulation layer is not damaged. The fixed support is a built-in fixed support without the huge reinforced concrete buttress of the original "three-way fixed support", which is an ideal for steam pipe laying. Steel sleeve steel insulation pipe manufacturers after years of use practice and the relevant testing center testing service life can reach more than 30 years.
Technical characteristics of the external sliding structure: the external sliding structure is more suitable for areas with abundant rainfall and high water level because there is a layer of air layer between the insulation layer and the external protective pipe, and the water immersed in the pipeline during transportation and construction can be discharged in the process of gradual warming of the pipe. However, for the soil with high content of chloride ion and sulfur ion (especially in coastal areas), the anti-corrosion of external steel pipe needs to be strengthened. The outer sliding structure is designed based on the idea of "steel trench", which can make full use of the elbow for natural compensation, reduce the cost, and reduce the thrust of the fixed pier. The pipeline is divided into multiple relatively independent parts at the fixed piers, and a tide pipe (preferably two sets) is arranged between the two fixed piers, so that the tide pipe can not only remove wet gas, but also serve as a signal pipe for daily operation, which can monitor the operation of the pipe network at any time. The outer sliding structure can be transformed into a vacuum pumping structure as required. Aluminum silicate composite steel jacket steel insulation pipe features: reduce project cost; low heat loss, energy saving; anti-corrosion, good insulation performance, long service life; small footprint, fast construction, favorable environmental protection; safety. Several characteristics of directly buried steam pipeline, for the direct buried steam pipeline as the heating industry Hengcheng material, because of its fast construction progress, good thermal insulation performance, low engineering cost, saving building materials and other advantages and has been more and more widely used.
Since there is no design specification for high-temperature steam pipelines, their insulation structures and fixed forms are different from manufacturer to manufacturer. In this paper, several kinds of directly buried steam pipeline on the market are discussed: directly buried steam pipeline; directly buried; external fixation; internal fixation. In recent years, many attempts have been made to directly buried steam pipelines in northern cities. When the steam pipeline passes through the urban main road and involves the problem of beautifying the environment, the direct buried laying method can solve the above problems well, and because of its fast construction progress, good thermal insulation performance, low engineering cost, saving building materials and other characteristics, it has been more and more widely used. As the steam buried pipeline is a new thing, the national construction department has not formulated a formal standard for the detailed regulations of the steam buried pipeline. Now the author according to the experience of insulation pipe production and construction in recent years to talk about several characteristics of directly buried steam pipeline. Aluminum silicate composite steel jacket steel insulation pipe because the transmission medium temperature is very high, generally more than 200 ℃, so can not be directly buried hot water pipe as the use of polyurethane as the only. A thermal insulation layer (because the carbonization temperature of polyurethane is about 142 degrees). Therefore, many manufacturers' steam direct buried pipelines adopt a composite insulation structure, and the composite insulation structure can be roughly divided into two structures: "plastic steel" and "steel steel": "plastic (glass fiber reinforced plastic) steel" structure: from inside to outside, the working core pipe, lubricating layer, composite insulation layer, high density polyethylene (or glass fiber reinforced plastic) outer protective layer. The role of the lubricating layer is to make the relative sliding between the working core tube and the thermal insulation layer, so as to avoid the destructive effect of mutual pulling due to the different thermal expansion coefficients of the working core tube of the pipeline and the inorganic thermal insulation layer in contact with it. Lubrication layer material is generally inorganic lubricant or inorganic drag reduction layer, composite insulation layer from the inside to the outside is generally inorganic hydrophobic insulation material + polyurethane foam insulation layer. In order to further reduce the heat loss caused by radiation, sometimes an aluminum foil reflective layer is added to the inorganic insulation layer. This kind of pipe is generally used in low-temperature steam transportation with a temperature below 220 ℃. Although the safety and service life is not as good as the "steel sheathed steel" structure of the composite insulation pipe to be introduced below, but because of the relatively low price, it is suitable for the project with low steam transmission requirements.
Steel sleeved steel "structure: the structure is roughly the same as" plastic sleeved steel ". From inside to outside, it consists of working core pipe, lubricating layer, composite thermal insulation layer (with aluminum foil reflective layer inside) and steel outer protective pipe. This structure has a greater improvement than the former in terms of high temperature and high pressure resistance, service life and safety factor. Since the outer protective layer is a steel pipe, it can play a certain role in delaying damage to the accident of leakage of the working inner pipe during operation, and prevent steam overflow from hurting people. The anti-corrosion of steel outer protective pipe generally adopts various forms such as two cloth, three oil, three PE, glass fiber reinforced plastic winding, polyurea spraying and epoxy powder spraying. Working core pipe; Lubricating layer; Inorganic insulation layer; Polyurethane insulation pipe; External protection pipe (high density polyethylene, glass fiber reinforced plastic or anti-corrosion treated steel pipe. Fixing forms of aluminum silicate composite insulation pipe and steam directly buried pipe: there are two fixing forms of steam directly buried pipe, namely, internal fixing form and external fixing form. External fixing means that the working core pipe and external protection pipe are fixed at the same time. Two large reinforced concrete buttresses are required at both ends of each section of pipe and compensator to ensure the fixing of the pipe." Plastic steel "and" glass steel "insulation structure to take this fixed form. Internal fixation is the fixation between the inner and outer pipes. The inner pipe is fixed on the outer protective pipe through a certain structural form, and the strength and rigidity of the outer protective pipe and the friction force between the outer protective pipe and the soil are fully utilized to fix the inner pipe, which can save The reinforced concrete buttress. Only the steel pipe as the outer protective pipe can be used in the form of internal fixation. External fixation because of the reinforced concrete buttress, so the construction area is large, cast. It has a large amount of capital, long construction period, and the buttress is the weak part of the pipeline. This part is prone to "thermal bridge" and water seepage. When the pipeline is not running normally, this part is also prone to accidents. Especially for the "steel sheathed steel" insulation structure, the thermal stress of the outer steel pipe caused by the temperature rise is particularly large, and the size of the reinforced concrete buttress is also particularly large, and this part is also more prone to accidents. The products of our company, the manufacturer of steel insulation pipe, have complete varieties, diverse specifications, beautiful appearance and stable performance. There are not only butt welded seamless elbows of various materials, but also non-standard products can be processed and manufactured according to the requirements of users. The products are exported to Europe, America and Southeast Asian countries and regions in China. The products are of good quality and reliable quality. They are well received by customers and peers. External processing: non-standard products can be processed according to user requirements. Customers are welcome to come to discuss and consult!