大型钢储罐不锈钢衬里设计与建造

Design and Construction of Large Steel Tanks Lined with Stainless Steel

介绍了高温工况下大型碳钢储罐不锈钢衬里的设计与建造过程。储罐本体及6组外加热盘管等按常规方法进行设计,不锈钢衬层分为5段,每段为一个独立的密封层,每段施工完毕后利用每段衬层的检查管口分别进行正压40 kPa、负压40 kPa试验,以此找出泄漏点;通过衬板层变形内应力试验来检验焊缝强度,确保高温工况下衬层的密封性。储罐接管采用内补强圈结构不仅方便衬层施焊而且保证焊接质量。储罐建造过程中打破传统的不锈钢衬层施工工艺,使之与罐壁同时进行建造,即先建造2圈或3圈壁板然后进行一段衬层板施工,衬层试验合格后依次进行下几圈壁板及下一段衬层施工,此法不仅节约大量辅助费用、方便施工与检漏,而且极大提高了衬层的制作质量。储罐整体制作完毕后进行盛水试验,再一次全面检查衬层的密封性。

The design and construction of large steel tanks lined with stainless steel for high - temperature services are introduced. The tank body and 6 groups of heating coils were designed according to the conventional practices. The stainless steel lining layer was divided into more than the 5 segments, and each segment was an independent sealing layer. After construction of each segment, it was tested under a positive pressure of 40 kpa and negative pressure of 40 kpa to find the leakage and weld strength through the internal forces and deformation lining layer so as to ensure the good sealing of lining layer under high temperature conditions. The internal reinforced ring structure for pipeline connection not only facilitated the welding of lining layer but also ensured the welding quality. The stainless steel lining was constructed simultaneously with the tank shell, which was different from conventional construction process. One segment lining was constructed after 2 or 3 rings of shell plate were installed. Only after the lining layer was tested and accepted could the construction of the following rings of shell plates and stainless linings begin. This practice had not only saved the auxiliary costs, facilitated the construction and leak detection but also greatly improved the fabrication quality of lining. The hydraulic test was performed after the construction of the whole tank to inspect the sealing of lining layers.