Prefabricated steel sleeve steel buried steam pipe a steel sleeve buried steel pipe insulation product structure prefabricated steel sleeve steel buried steam pipe is generally applicable to transport temperature between 150 ~ 300 ℃, pressure is less than 1.6MPa steam. The product is technically solve the key problems of buried pipelines in a waterproof, anti-corrosion, thermal bridges, hydrophobic, etc., so that the steam pipe line is running at full sealed state, after the project proved to be safe and reliable. Prefabricated steel sleeve steel buried steam pipe: steel pipe by conveying the media, hydrophobic compound silicate insulation, steel casing and corrosion layer structure, the steel structure on the next page: nominal diameter of 20 to 600 mm, used in line GB8163-87 of seamless steel tubes, nominal diameter 600 mm or more, welded steel pipes used in line with GB / T3092-93 of, or compliance with spiral steel SY / T5037-92 and comply GB8163-87 the hydrostatic test requirements. Steel sleeve steel steam pipe insulation insulation layer: Layer 2 hydrophobic insulation material composite silicate shell, wrap the inner seam wrong with the inner steel pipe is formed integrally with the steel casing bearing slide through the guide. Jacket pipe: steel jacket spiral steel pipe used in line with GB / T3092-93 welded steel pipe type SY / T5037-92 and 100% were 0.6MPa water pressure test. Buried steel sleeve steel pipe insulation coating: anti-corrosion steel casing wall using two degrees epoxy zinc-rich primer, five thick slurry coal tar epoxy coating and three cross-alkali glass cloth wrapped practices. Under normal circumstances guaranteed for 20 years. 2, the technical characteristics  (1) used between the bearing and steel casing to the inner wall of the pipe as a sliding interface in the form of structure, so that no relative pipe runs between work and insulation materials, insulation materials are generally solved the buried pipe mechanical wear, chalking problem. (2) high strength steel casing, good sealing performance, can effectively waterproof, impervious. (3) sets of steel buried steel pipe insulation steel casing: wall using two degrees epoxy zinc-rich paint three five oil cloth to strengthen the level of coal tar epoxy anti-corrosion treatment and the use of sacrificial anodes protect the life of the steel casing corrosion layer In more than 20 years. (4) using the two-story shell hydrophobic compound silicate insulation materials, both inside and outside the wrong dressing on the steam pipe joints, reducing heat loss.  (5) bearing steel guide cannula and fixed bearing insulation measures taken to prevent the generation of thermal bridges.  (6) steel sleeve steel pipe insulation system is fully sealed form hydrophobic hydrophobic pipeline using the plug-in layout flexibility, without a separate inspection wells.  (7) steel casing pipe located both timely exhaust ventilation tide can also be run as a signal tube daily.  (8) work steel pipe elbows, tees and bellows, fixed bearings are arranged in the steel casing. Pipe entire work environment is running under seal, safe and reliable.