DAY 1
General
• Regulatory Issues
• NACE Standard
• INGAA
• ASME B31.8S
External Corrosion Direct Assessment (ECDA)
NACE Standard RP0502-2002
Four Steps Definitions (Pre-Assessment, Indirect Examinations, Direct Examination,
Post Assessment)
Pre-Assessment
• Data Collection
• ECDA Feasibility for pipelines
• Indirect Inspection Tool selection
• ECDA Region identification
Indirect Examination
• Selection of Indirect Selection Tools
• Data alignment and comparison
• Indication Classification
Direct Examination
• Prioritization
• Excavations and Data Collection
• Coating damage and corrosion depth measurements
• Measurements
• Remaining strength evaluation
• Root cause analysis
• Mitigation
• In-Process evaluation
• Reclassification and Reprioritization
• Guidelines for determining the required number of Direct Examinations
DAY 2
Post Assessment
• Remaining Life Calculations
• Reassessment Intervals
• Assessment of ECDA Effectiveness
• Feedback and Improvements
Records
Indirect Inspection Methods
• Close Interval Surveys CIS
• AC Current Attenuation
• DCVG and ACVG Surveys
• Pearson Surveys
• Cell to cell Surveys
Example of ECDA Application
Internal Corrosion Direct Assessment (ICDA)
NACE Standard prepared by TG 293
Four Steps Definitions (Pre-Assessment, Indirect Examinations, Direct Examination,
Post Assessment)
Pre-Assessment
• Data Collection
• ICDA Feasibility for pipelines
• ECDA Region identification
Indirect Examination
• Steady State Flow Modeling Calculations
• Inclination Profile Calculations
Direct Examination
• Site Selection
• Site Selection for Constant Flow Rate Pipelines
• Site Selection for Varied low Rate Pipelines
• Excavation and Inspection
Post Assessment
• Assessment of ICDA Effectiveness
• Reassessment Intervals
Records
Example of ICDA Application
Stress Corrosion Direct Assessment (SCCDA)
NACE Standard prepared by TG 273
General – Overview of SCC types and Characteristics
Four Steps Definitions (Pre-Assessment, Indirect Examinations, Direct Examination,
Post Assessment)
Pre-Assessment
• Data Collection
• Prioritization of pipeline segments
Indirect Examination
• Site selection
• Field verification of selected sites
Direct Examination
• Excavation and examination
Post Assessment
• Evaluation and documentation
• Reassessment Intervals
Records
Example of SCCDA Application
