报道φ377埋地管道工业规模预备试验的初步结果,在土壤电阻率相当高的新疆库鄯输油管管道工程中,分别依靠三组长1000m的带状镁合金牺牲阳极,在两个相邻的测试桩上以两根并联(2×250m)或四根并联(4×125m)的方式埋设,使得长81km、131km和107km的三处φ610长输管段受到了有效的阴极保护。
For external corrosion protection of the newly constructed φ610mm oil pipeline from Kurle to Shanshan in Xingjiang,a combination scheme of high quality coating and cathodic protetion executed partially in sacrificial anode mode was designed.Due to the high resistivity of soil in this region,extruded magnesium ribbons instead of traditional cast ingots were selected as sacrificial anodes.Conventionally,the continuous ribbon anodes were installed lengthwise in a trench parallel to and of the same length as the pipeline to be protected.In this prohect,however,only a short section of ribbon anode was found sufficiet to provide a high level of protection for a considerabl longer pipeline.Such a special configuration was preliminarily verified on a φ377mm pipeline in Shandong and then put into practice in Xingjiang.Two groups of anodes consisting of 2×250m or 4×125m ribbons were installed respectively at two test stations separated about 1Km.Potential measurements indicated that successful protection was achieved along the pipeline longer than 80Km
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