直埋蒸汽保溫管“內滑動”構造
Inside Sliding Structure of Direct Buried Steam Insulation Pipe
1)內鋼管/ 2)富鋅底漆/ 3)減阻層/ 4)保溫資料(硅酸鈣)/ 5)輻射反射層/ 6)保溫資料(聚氨酯)/ 7)外防護層
1) Inner steel pipe / 2) Zinc-rich primer / 3) drag reduction layer / 4) thermal insulation data (calcium silicate) / 5) radiation reflector / 6) thermal insulation data (polyurethane) / 7) external protective layer
蒸汽保溫管內滑動構造
Sliding Structure in Steam Insulation Pipe
直埋蒸汽保溫管“內滑動”構造特點：
Structural characteristics of "internal sliding" of directly buried steam insulation pipe:
1)內鋼管經過拋丸除銹到達Sa2.5級(近白級)后，涂刷無機富鋒底漆，避免施工時期進入保溫層的水汽對內鋼管的腐蝕。
1) After shot peening and rust removal, the inner steel pipe reaches Sa2.5 (near white grade), and is coated with inorganic rich front primer to avoid the corrosion of the inner steel pipe caused by water vapor entering the insulation layer during the construction period.
2)管道受熱收縮發(fā)作位移，內鋼管里面包扎的一層減阻層，可以增加內鋼管在保溫層上的挪動的阻力。
2) Pipeline shrinkage occurs displacement when heated, and a layer of drag reduction layer wrapped inside the inner steel pipe can increase the resistance of the inner steel pipe to move on the insulation layer.
3)保溫資料內層采用微孔硅酸鈣錯縫包扎在內鋼管上，并在縫隙填充耐低溫高彈保溫資料，無效增加了熱損失。
3) Microporous calcium silicate is used to wrap the inner layer of heat preservation material in staggered seams on the inner steel pipe and fill the gap with low temperature and high elasticity heat preservation material. Invalidity increases the heat loss.
4)外層保溫選用聚氨酯保溫資料，應用聚氨酯優(yōu)良的保溫功能，控制外防護層外表溫度低于50℃,維護外防護層，添加管道全體壽命。
4) The polyurethane insulation material is selected for the outer layer insulation. The excellent insulation function of polyurethane is applied to control the outer temperature of the outer protective layer below 50 C, maintain the outer protective layer and add the whole life of the pipeline.
5)兩層保溫資料之間參加“轄射反射層”，控制了熱量的福射散熱損失，使直埋蒸汽保溫管愈加經濟合理。
5) Participate in the "reflective layer" between the two layers of thermal insulation data to control the heat radiation loss and make the directly buried steam insulation pipe more economical and reasonable.
6)蒸汽保溫管外防護層可選用多種方式，包括玻璃鋼、套管外加防腐層等方式，防腐層方式多樣，無效維護鋼套管不受地下水腐蝕。
6) There are many ways to choose the outer protective layer of steam insulating pipe, including FRP, casing and anti-corrosion layer. The anti-corrosion layer is various, and the steel casing can not be corroded by groundwater if it is not effectively maintained.
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