山岭隧道穿越段油气管道防腐

Anti-corrosion of Oil and Gas Pipelines in Crossing Section of Mountain Tunnel

结合山岭隧道穿越段管道不同的安装方式及运营环境,分析管道、管道防腐层补口及管卡、螺栓等钢构件的防腐方式;从阳极接地电阻计算公式入手,对山岭隧道穿越段管道增加牺牲阳极作为补充保护进行分析。结果表明,山岭隧道内管道应采用加强级防腐层;采用机械化补口施工,选择压敏胶型热收缩带、粘弹体胶带等补口材料,可以保证补口施工质量;对于隧道内的管卡、螺栓等异形钢构件,应选择密封效果好的粘弹体进行防腐;带状锌合金牺牲阳极可以有效地对隧道内管道进行补充保护,电流测试桩安装在隧道外两端。

Combined with different installation methods and operating environments of pipelines in crossing section of the mountain tunnel, the anti-corrosion methods of pipelines, pipeline anti-corrosion layer joint coating, pipe clamps, bolts and other steel components are analyzed. Starting with the calculation formula of the anode grounding resistance, the addition of the sacrificial anode as the supplementary protection for pipelines in the crossing section of the mountain tunnel is analyzed. The results show that the pipeline in the mountain tunnel should adopt the enhanced grade anti-corrosion layer. The use of mechanized joint coating construction, selection of pressure-sensitive adhesive type heat shrinkable tape, non-crystalline low-viscosity polyolefin compound coating and other joint coating materials can ensure the quality of joint coating construction. For the profiled steel members such as pipe clamps and bolts in the tunnel, the non-crystalline low-viscosity polyolefin compound coating with good sealing effect should be selected for corrosion protection. The belt zinc alloy sacrificial anode can effectively achieve supplementary protection of the pipeline in the tunnel, and the current test piles are installed at both ends outside the tunnel.