Polyurethane foam insulation pipe with black jacket sheath is suitable for conveying steam with temperature between 150 ℃ and 350 ℃ and working pressure less than 1.6Mpa. The above knowledge will certainly bring a lot of help to your work. High pressure polyurethane foaming machine is used to remove rust on the outer surface of the steel pipe, and corona treatment is carried out on the outer surface of the external protection pipe, which improves the bonding energy of the insulation pipe. This paper is composed of polyurethane insulation pipe. Production process of polyurethane direct buried thermal insulation steel pipe with steel sleeve and steel steam insulation; polyurethane foam insulation has been used in many occasions. Low thermal conductivity and low water absorption, together with insulation layer and high-density polyethylene or glass fiber reinforced plastic protective shell with good waterproof function outside, have changed the situation of "wearing wet cotton padded jacket" in traditional trench laying heat supply pipeline, greatly reducing the overall heat loss of heating pipe. The heat loss of heat supply network is 2%, less than 10%. In today's life.
The accurate location of water leakage and the size of leakage degree, the use of thermal insulation materials in thermal insulation steel pipe can keep warm and sound insulation, improve the comfort of living, and is conducive to energy conservation and emission reduction. Since the birth of polyurethane composite materials in the 1930s, polyurethane foam insulation pipe has been developing rapidly as an excellent thermal insulation material. 4. The test method specified in this standard is applicable to the test of heat loss of heat insulation structure of elbow, three links and other parts of heating pipes, and the insulation structure of the prefabricated insulation pipe. 5. According to the conditions of the site, the insulation structure and the requirements of the test level, different test methods should be chosen, or several methods should be chosen for testing at the same time, and polyurethane foam and high density polyethylene can be processed. Polyurethane insulation steel pipe insulation layer: rigid polyurethane foam plastic, polyurethane insulation steel pipe protective shell: use high density polyethylene or glass steel, polyurethane insulation pipe leakage alarm line: when manufacturing high temperature prefabricated directly buried insulation pipe, in the insulation layer near the steel pipe, buried alarm line, once the pipeline leakage occurs.
The temperature has reached the temperature range of - 70 ℃ - 160 ℃, which does not constitute pollution; the open flame can extinguish itself, and only carbonization does not drip during combustion, and the size and shape of carbonization layer are generally unchanged, which can effectively block the entry of air, prevent the spread of fire, and have good fire safety performance. Directly buried thermal insulation pipe is mainly composed of working pipe, thermal insulation layer and polyethylene outer protection pipe, which is widely used in the field of cooling, heating and transportation in the field of anti-corrosion and thermal insulation pipeline engineering. The transmission medium is generally oil, water and other liquid objects. In the reasonable selection, the construction is safe, reliable and economical. Polyurethane is a kind of polymer with urethane repeat structure unit in macromolecular chain, which is called poly (ester) or polyurethane (P). Ensure that the surface of the external protection tube is kept at normal temperature, barrier and reflective layer: ensure that the organic foam material does not enter the inorganic hard and high-temperature resistant layer, reflect some heat of the high temperature resistant layer, and the inorganic hard insulation layer: high temperature resistance, and ensures the interface temperature between the organic insulation layer.
These methods have good removal effect, high efficiency, significant comprehensive economic benefits, and can effectively extend the service life of prefabricated polyurethane insulation pipe. Therefore, in recent years, the application and development are very rapid, and the product implementation standards are different. The plastic coating refers to GB / T120 (water supply plastic coated composite steel pipe), while the plastic reference GB / t136 (water supply plastic lined composite steel pipe). In this way, the three functions can significantly improve the 360 degree quality of anti-corrosion pipeline, which has the characteristics of chemical corrosion resistance, cathodic stripping resistance and mechanical damage resistance. Moreover, the cost of 3PE anti-corrosion steel pipe is suitable for the implementation of the standard. The main specification of the standard is polyethylene and high-density polyethylene. The Vicat softening point is set at no higher than 110 ℃, and the thickness of the external anti-corrosion coating is lower. High density polyethylene external insulation polyurethane insulation pipe, polyurethane insulation pipe as today's energy saving pipeline transportation and application of steel outer sheath polyurethane insulation pipe, etc., other are according to the different transport medium is divided into buried rigid polyurethane foam plastic anticorrosive insulation pipe, steam directly buried polyurethane composite prefabricated insulation pipe and high temperature polyurethane insulation pipe.
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