Influence and Countermeasures of Stray Current on Courtyard Gas Service Pipes

The continuous pipe-to-soil potentials of 63 sticks of courtyard gas service pipes, built in 17 courtyards of Hangzhou, were detected. And then, the detection to the stray current of the typical courtyard gas service pipes was performed in peak and valley period of electric time, respectively. The results show that the influence caused by stray current existed on most of the courtyard gas service pipes in the tested courtyards. The influences were different for different storeys. For the courtyard gas service pipes with more stray current, the way of fixing zinc sacrificial anode was adopted to prevent the stray current. This method has some effect of stray current drainage.