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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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.
Indirect assessment techniques (special over-the-line potential and soil corrosivity surveys) were applied on an electrically discontinuous effluent sewer land outfall. Critical areas were excavated and direct assessment performed. Mitigation methods were recommended.