Steel sleeve steel pipe insulation from the inside to the outside of the first floor is divided into three layers: Working pipe layer depending on the design and requirements of customers generally use seamless (GB8163-87) spiral welded pipe (GB9711-88; SY / T5038-92) and Longitudinal (GB3092-93). Advanced steel surface after shot blasting process, steel rust rating up to GB8923-1988 standard Sa2 grade, surface roughness up GB6060.5-88 standard R = 12.5 microns. Second layer: polyurethane insulation in the cavity with a high pressure foaming machine steel tube between the outer protective layer is formed in a one-time injection of a rigid polyurethane foam stock solution is made. Commonly known as "pipe-in-pipe foaming process." First, its role waterproof, two insulation, three heating network is to support the weight. When the transmission medium temperature: -50 ℃ -120 ℃, the selection of rigid poly semicarbazide acetate foam insulation do. Third layer: anti-corrosion steel pipe insulation corrosion is a kind of steel corrosion resistance, and has good insulation properties, is widely used in construction and promotion, and constantly improve and spread. Corrosion pipe insulation types and have different processing methods, different processing methods to determine the pipe have different properties and functions, and the use of the range will change. Corrosion pipe insulation production needs to be in accordance with national standards, standards of different processing methods follow different, but must comply with national production standards, and to strictly follow and execute. A steel sleeve steel steam pipe insulation First layer: Working pipe layer according to the design and customer requirements generally used in seamless (GB8163-87) spiral welded pipe (GB9711-88; SY / T5038-92) and Longitudinal (GB3092- 93). Advanced steel surface after shot blasting process, steel rust rating up to GB8923-1988 standard Sa2 grade, surface roughness up GB6060.5-88 standard R = 12.5 microns. Second layer: polyurethane insulation in the cavity with a high pressure foaming machine steel tube between the outer protective layer is formed in a one-time injection of a rigid polyurethane foam stock solution is made. Commonly known as "pipe-in-pipe foaming process." First, its role waterproof, two insulation, three heating network is to support the weight. When the transmission medium temperature: -50 ℃ - 120 ℃, the selection of rigid poly semicarbazide acetate foam insulation do. Third layer: high-density polyethylene protective layer of a certain thickness of precast black (yellow) plastic pipe, its role from one protective polyurethane insulation mechanical hard object damage, and second, anticorrosion and waterproof. Specifications: OD mm 238 mm 3.5 Weight Kg 2.475 wall thickness tolerances mm ± 0.28 mm 159 corresponding pipe diameter corresponding insulation thickness corresponding sleeves mm 245 mm 37 Features: 1, lower project cost. 2, low heat loss and save energy. 3, good corrosion, insulation performance, long service life. 4, small footprint, fast construction, favorable environmental protection.