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Methods for dealing with sources of errors affecting the accuracy of the Direct Current Voltage Gradient (DCVG) coating defect identification and sizing tool.
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Recent close-interval potential surveys have raised concerns about the accuracy of potential measurements on older, poorly-coated pipelines. Two sources of error were identified: metallic IR-drops and equalization currents.
Comprehensive and portable data format for Close Interval Surveys (CIS) including 1) standard current-applied. 2) on/off. 3) instant-off. 4) side-drain readings. 5) electric field gradient. Historical Document 1997
在埋地或水下金属管道 上进行 密间隔 电位 检测 与直流 表面电位梯度 检测 Close-interval DC pipe-to-electrolyte potential surveys on buried or submerged pipelines. For those operating pipelines or performing, interpreting & regulating surveys.