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钢套钢保温钢管的防腐处理方法
Anti-Corrosion Treatment of Steel Sheathed Steel Insulation Pipe
钢套钢保温管是由输送介质的钢管、防腐外套钢管以及钢管与外套钢管之间填充的超细玻璃棉组合而成,也可采用石墨、硅钙瓦管壳及填充聚氨酯泡沫复合而成。钢套钢（钢套管）埋设技术是一种防水、防漏、抗渗、抗压和全封闭的埋设新技术，是直埋敷设技术在地下水位较高地区使用的一次较大突破。直埋管道的保护管的首要问题是严密防水的可靠性，此外要有良好的机械强度，钢套管由于强度高采用焊接连接，防水的密封性能可靠性十分高，另外，其耐高温性能也是其它外保护管所不能比拟的。在地下水位高的地区，为保证地下水不影响蒸汽直埋管道的正常运行，外保护层采用坚固、密闭的钢管外壳 “钢套钢”直埋蒸汽管道中的支架型式根据管道的不同位置，以及不同的用途，可以在“钢套钢”直埋蒸汽管道中应用三种支架，分别为导向支架、滑动支架和固定支架。导向支架在“钢套钢”直埋蒸汽管道中，在弯头、折角等方向改变部件的直管段中通常使用导向支架，导向支架用于限制工作钢管在外保护层钢管中的移动空间，它防止了工作钢管的径向位移，使工作钢管只能沿着管道的轴向自由膨胀。导向支架结固定支架用于保护管道中的折角、弯头等管件，平衡管道中的应力，阻止管道中应力的传递。
The steel sleeve steel insulation pipe is made up of a super fine glass wool which is filled with conveying medium steel pipes, anticorrosive coat pipes, and steel pipes filled with outer steel pipes. It can also be made of graphite, calcium silicate tiles and polyurethane foam. Steel sleeve steel (steel sleeve) embedding technology is a new embedding technology of waterproof, leak-proof, seepage-proof, compression-proof and full-enclosed. It is a great breakthrough in direct embedding technology used in areas with high groundwater level. The primary problem of the protection pipe of directly buried pipeline is the reliability of tight waterproofing. Besides, it should have good mechanical strength. Because of the high strength of the steel sleeve, the reliability of the waterproofing sealing performance is very high. In addition, its high temperature resistance performance is incomparable with other external protection pipes. In the area with high groundwater level, in order to ensure that groundwater does not affect the normal operation of steam directly buried pipeline, the outer protective layer adopts the support type of the steel tube shell "steel sleeve steel" directly buried steam pipeline. According to the different position of the pipeline and the different uses of the pipeline, three kinds of support can be applied in the steel sleeve steel directly buried steam pipeline, namely the guide support and sliding support. And the fixing bracket. Guiding bracket is usually used in the straight section of the steam pipe directly buried in "steel sleeve steel". The guiding bracket is used to restrict the moving space of the working steel pipe in the outer protective layer steel pipe. It prevents the radial displacement of the working steel pipe and makes the working steel pipe only expand freely along the axial direction of the pipe. The guide bracket fixed bracket is used to protect the bends and elbows in the pipeline, balance the stress in the pipeline and prevent the stress transmission in the pipeline.