Stray current in urban and long-distance gas pipelines
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The stray current in the cities where pipelines are in operation and in long-distance gas pipelines has a significant impact on pipeline corrosion. May I ask the experts: how should stray current be measured in cities and long-distance pipelines, and what equipment is used for this purpose? How should it be removed after testing?
Stray current is divided into direct-current stray current and alternating-current stray current. The measurement of stray current is carried out by assessing the potential gradient between the pipe and the ground. Since stray current varies with time and distance from the pipe, determining its level is a complex task. Professor Hu Shixin’s \"Cathodic Protection Engineering Handbook\" provides specific methods for measurement; generally, a multimeter and a portable reference electrode are used. There are also specialized instruments for measuring stray current, and one can consult the Institute of Metal Research of the Chinese Academy of Sciences for more information. Once stray current is detected, it can be eliminated through two methods: either by using a current dissipation method or by creating a circuit! For detailed references, see the \"Cathodic Protection Engineering Manual\"
Is the “Cathodic Protection Engineering Handbook” available online? Or where can it be bought?