External Corrosion Direct Assessment

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2. Indirect Inspection

Once a thorough Pre-Assessment phase is complete, we're prepared to move into the indirect inspection phase, with a full understanding of your pipeline's risk factors, and the tools needed to address them. A combination of two or more of the following indirect or above-ground inspection techniques are used to identify coating faults, anomalies, and/or corrosion activity:

• Close Interval Surveys (CIS)
• Direct Current Voltage Gradient (DCVG)
• Alternating Current Voltage Gradient (ACVG)
• Soil & Water Analysis
• Electromagnetic Surveys
• Pearson Surveys
• Global Positioning Surveys (GPS)
• Depth of Cover Surveys (DOC)

3. Direct Examination

After completion of the indirect inspections, the assessment specialists at Allied Corrosion analyze the data to select sites for excavations and pipe surface evaluations. The direct examination's data is examined together with prior data to determine the existence and severity of external corrosion on the pipeline. Our integrity specialists can evaluate the coating performance, provide corrosion measurements, pipe strength calculations, corrosion rate estimates, and root cause analysis during this step.

4. Post Assessment

This step involves analysis and summation of data collected from the previous three external corrosion direct assessment steps to determine the effectiveness of the ECDA processes, establish pipeline integrity, and set future reassessments intervals.

Need a Qualified Corrosion Expert to perform an ECDA?

Allied Corrosion has the qualifications and the specific technical expertise required to assist you with any of the appropriate ECDA filed services or manage your entire Pipeline Integrity Management program. Allied Corrosion has assembled a group of field-proven pipeline assessment specialists to provide cost effective solutions and compliance with regulatory requirements associated with DOT/OPS Title 49 CFR Part 195.452 (Liquid Pipelines) and CFR Part 192 (Natural Gas Transmission Pipelines).

Allied Corrosion Industries, Inc., maintains a qualified and experienced staff of registered professional engineers, NACE certified Corrosion Specialists, Cathodic Protection Specialists, Senior Corrosion Technologists, and Corrosion Technicians. Our staff has more than two centuries combined experience in the corrosion control field. Corrosion prevention solutions are our business - our only business!

All work is performed in accordance with the NACE Standard RP0502-2002, “Pipeline External Corrosion Direct Assessment Methodology”.