The outer 3PE anti-corrosion steel sleeve steel insulation steel pipe has the characteristics of high strength, not easy to be damaged and can withstand large upper load. In order to achieve a long life, the steel outer sleeve needs to be anti-corrosion treated.
Prefabricated direct-buried polyurethane insulation pipe is composed of an outer protective steel pipe plus steel pipe anti-corrosion, a polyurethane foam insulation layer and an inner working steel pipe. Steel-sheathed steel steam composite insulation pipe is suitable for transporting steam or other media below 350 degrees Celsius. This product uses steel pipes as the outer protective layer, which has high strength, cannot be damaged, easy construction and maintenance, and long service life.
Regarding the specification requirements for borehole pouring testing, the acoustic wave transmission method is used to detect the quality of the hydraulic type; according to the design requirements, acoustic measuring pipes should be buried. For hydraulic types with a pile diameter between 120cm and 180cm, three acoustic measuring pipes need to be buried, and the pile diameter is exactly To 120cm hydraulic type, two acoustic pipes need to be buried. In conventional design, the basic requirements are to use steel pipes with an outer diameter of 50-60mm and a thickness in the range. During construction, additional casings are used for on-site welding.
The commonly used insulation material is rigid polyurethane foam, and its applicable temperature is -185~120℃. This material has a soft texture. In order to increase its strength, a high-density polyethylene layer is applied outside the insulation layer to form a composite material structure to prevent groundwater from penetrating into the insulation layer. Use high-pressure complete sets of polyurethane foaming equipment to perform shot blasting and rust removal on the outer surface of the steel pipe and corona treatment on the inner surface of the outer protective pipe to improve the bonding performance of the insulation pipe.
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