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51317--9378-How Deep is too Deep for Indirect Inspections?

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.

Product Number: 51317--9378-SG
Author: Jim Walton
Publication Date: 2017
$20.00
$20.00
$20.00

The most recent Notice for Proposed Rule Making (NPRM)(1) issued by the US Department of Transportation Pipeline and Hazardous Materials Safety Administration (PHMSA) addresses pipeline integrity and indirect inspections and has language that relates to Horizontally Directionally Drilled (HDD) installed pipelines. It is known that the deeper the pipeline is the less sensitive indirect inspections such as Close Interval Surveys, Current Attenuation Surveys, Direct Current Voltage Gradient Surveys and Alternating Current Voltage Gradient surveys can be. The question becomes how deep is too deep to run a successful indirect inspection and still have valid results? This paper will address this issue with real world examples of indirection inspections of HDD installed pipelines at various depths including a discussion of potential alternate methods for inspection. Suggested indirect inspection criteria of these deep pipelines will also be addressed.

Key words: conference papers, 2017 conference papers, Indirect, Inspections, Depth, CIS, ACVG, CA, DCVG

The most recent Notice for Proposed Rule Making (NPRM)(1) issued by the US Department of Transportation Pipeline and Hazardous Materials Safety Administration (PHMSA) addresses pipeline integrity and indirect inspections and has language that relates to Horizontally Directionally Drilled (HDD) installed pipelines. It is known that the deeper the pipeline is the less sensitive indirect inspections such as Close Interval Surveys, Current Attenuation Surveys, Direct Current Voltage Gradient Surveys and Alternating Current Voltage Gradient surveys can be. The question becomes how deep is too deep to run a successful indirect inspection and still have valid results? This paper will address this issue with real world examples of indirection inspections of HDD installed pipelines at various depths including a discussion of potential alternate methods for inspection. Suggested indirect inspection criteria of these deep pipelines will also be addressed.

Key words: conference papers, 2017 conference papers, Indirect, Inspections, Depth, CIS, ACVG, CA, DCVG

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