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在天然气管道敷设中,为了防止地下金属管道的腐蚀,均采用阴极保护或牺牲阳极保护。当新管线与老管线交叉或邻近、平行、敷设时,必需进行联合保护,使用均压线把它们连接起来,从而达到保护电位曲线分布相等,得到良好的保护效果。在均压线连接中,由于原已保护的老管线内壁受天然气腐蚀介质的影响,并有一定的输气压力,若使用电(气)焊连接是不安全的,锡焊也很难作到。为此,我们从76年开始就采用了具有特殊性能的导电胶粘接,经几年的试用,它据有操作简便,导电性能良好,强度较
In natural gas pipeline laying, in order to prevent the corrosion of underground metal pipes, are used cathodic protection or sacrificial anode protection. When the new pipeline crosses with the old pipeline or adjacent, parallel and laying, it is necessary to carry out the joint protection and connect them with the voltage-equalizing line so as to achieve the equal distribution of the protection potential curve and obtain the good protection effect. In pressure equalizing line connection, since the inner wall of the old pipeline which has been protected is affected by the corrosive medium of natural gas and has a certain gas transmission pressure, it is very difficult to soldering if using electrical (gas) welding connection is not safe . To this end, we have been using a conductive adhesive with special properties since the beginning of the year 76. After several years of trial, it has the advantages of easy operation, good electrical conductivity and high strength