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ACVG or DCVG - Does it Matter?

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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.

 

Product Number: 51317--9374-SG
ISBN: 9374 2017 CP
Author: Jim Walton
Publication Date: 2017
Industry: Corrosion Monitoring and Control
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$20.00
$20.00

With the most recent NPRM that addresses pipeline integrity and indirect inspections there is language that relates to DCVG and ACVG including certain criteria associated with what must be addressed after completing DCVG or ACVG surveys. While generally DCVG and ACVG are categorized as having the abilityof finding coating defects there can be a major difference in the success of the chosen technique depending on the pipeline conditions. There can be a major difference between the two techniques in certain conditions. This paper would point out when and why to use either technique including what the critieria of percent IR and decibal microvolt really mean when conducting these survey techniques.

Key words: Direct, Alternating, ACVG, DCVG, Current, Voltage

With the most recent NPRM that addresses pipeline integrity and indirect inspections there is language that relates to DCVG and ACVG including certain criteria associated with what must be addressed after completing DCVG or ACVG surveys. While generally DCVG and ACVG are categorized as having the abilityof finding coating defects there can be a major difference in the success of the chosen technique depending on the pipeline conditions. There can be a major difference between the two techniques in certain conditions. This paper would point out when and why to use either technique including what the critieria of percent IR and decibal microvolt really mean when conducting these survey techniques.

Key words: Direct, Alternating, ACVG, DCVG, Current, Voltage

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