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How deep is too deep to run a successful indirect inspection of Horizontally Directionally Drilled (HDD) installed pipelines and still have valid results? Real world examples of indirection inspections at various depths. Alternate methods for inspection. Suggested indirect inspection criteria.
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This paper will point out when and why to use either Direct Current Voltage Gradient (DCVG) or Alternating Current Voltage Gradient (ACVG) surveys, including what the criteria of percent IR and Decibel microvolt (dBµV) really mean when conducting these survey techniques.
Pipelines have been considered one of the safest methods of transporting energy from one place to another. This is achieved through a systematically planned, documented, and comprehensive pipeline integrity management (PIM) program. PIM covers areas such as engineering, operations, inspections and maintenance, health and safety, and environment protection.