一、金属材料保护层结构
说明1、金属保护层为室外架空保温结构的主要形式，也可用于室内保温结构。
2、A-A（2）断面为考虑管子伸缩的连接方式，长L为管段伸缩量决定。
3、水平管道采用缝毡保温时，其管顶应预先敷设一层10~30mm厚棉毡，宽度为管周长的1/3，然后再包扎缝毡。
4、镀锌铁皮纵向拉缝应在管道水平中分线下30~45度处。
metal material protection layer structure
1, a metal protective layer for outdoor overhead insulation structure for main form, can also be used for indoor thermal insulation structure.
2, A-A ( 2) section for considering pipe telescopic connection, long L pipe expansion quantity decision.
3, horizontal pipeline using blanket insulation, the top of the pipe shall be laying a layer of 10~30mm thick wool felt, width of the tube circumference 1/3, then wrap blanket.
4, a galvanized iron sheet longitudinal gap should be in the horizontal pipe lines under 30~45 degrees.
二、复合材料保护层结构 composite material protective layer structure
三、垂直管道保护层结构 Vertical pipeline protection layer structure
四、法兰保护层结构 Flange protection layer structure
五、阀门保护层结构 Valve cladding
说明：
在施工前，保冷结构固定支撑件应按图安装好。当管道不准焊接时。托环（1）改用托环（2）立管支撑处的钢套管内点焊接环形托板，用来托住硬木垫块，并做好防潮层。钢套管内径为D+2&+10mm管壁与托板厚均为&=4mm.
金属保护层的支撑除在钢套管部位允许与管道支架统一考虑外，其它部位均采用下板托上板的方式。见A-A断面图。
其它有关保冷材料的选用与施工与水平管道相同。
内托板外径为D+2&+9mm，空心内径为D+2/3&mm
Explain.
Before the construction, cold insulation structure fixed supports should be installed according to the drawing. When the pipeline allowed welding. Support ring ( 1 ) to support ring ( 2 ) vertical pipe supports of the steel casing welding ring plate, used to hold the wood block, and a moisture-proof layer. Steel casing inside diameter is D+2&+10mm tube wall and the plate thickness is &=4mm.
The protective metal layer support except in the steel casing pipe bracket parts allow and unified consideration, other parts are made of lower plate support plate way. See A-A section map.
Other related cold insulation material selection and construction and horizontal tubes of the same.
Inner plate diameter is D+2&+9mm, the inner diameter of the hollow D+2/3&mm
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