External Corrosion Direct Assessment Procedure – RSTRENG

Section 1 | Focused on Understanding and Recognizing Pipe Defects to Meet Industry’s Zero Leak Mandate

• Why Do Pipelines Fail?
  • Flawless Pipe
• Locate & Define Coating Holidays and Pipe Defects
  • In Line Inspection (ILI)
  • Pressure Test (Hydro)
  • Direct Assessment (DA)
  • Other Technology
• Excavations/Direct Examination
  • Reported Critical Features
  • Tool Performance
  • Direct Examination Step
• Site Analysis and Documentation
• Corrosion Mapping Tools
  • Non-Destructive testing (NDT)
  • Pit Gauges (Manual)
  • Pit Gage Measurements
  • 3D Structured Light Toolbox
  • Guided Wave Testing (GWT)
  • Magnetic Particle Inspection (MPI)
  • Dye Penetrant Inspection (DPI)
• Identify & Classify Indications
  • Report Critical Features from ILI
  • ILI Tool Performance
• Prioritization of Indications
  • ILI Effectiveness
• Data Requirements and Report Results
• Mitigation and Repair

Section 2 | Definitions

Section 3 | Technologies Used for Assessing Pipeline Defect

• Types of Corrosion Measurements
  • Common Field Type Mechanical Pit Gauges
  • 3D Tools to Assess Defects
• ASME/API 579 FFS-1 (Level 1, 2 and 3)
• Pit Gauges
• Industry Desires
  • Significant opportunities for improvement using 3D Structured Light
• 3D Analysis Approach
• Examples of 3D Structure Light Measurements
  • 3D Toolbox
  • System Components
  • 3D Structured Light Toolbox

Section 4 | Evaluation of the Remaining Strength of Corroded Pipe

• B31.G, Modified B31.G and RSTRENG Background
  • Barlow’s Formula
  • MAOP (Maximum Allowable Operating Pressure)
  • B31.G Criterion & Modified B31.G
  • Basic Equation for Hoop Failure Stress
• References in DOT 192.483c, 192.933, 195.585 & 195.587
  • 485c Remedial measures: Transmission Lines
  • 933 What actions must be taken to address integrity issues?
  • 587 – What methods are available to determine the strength of corroded pipe?
• Finding and Measuring the Corrosion
  • ILI Boxing or Clustering
  • Manual Gridding and Clustering
  • River Bottom Profile
• Assessing Corrosion
  • Level 1
  • Level 2 – Effective Area Method
• Interaction Rules
  • ASME B31.8
• Limitations
• Calculations with RSTRENG Program
  • Updating Existing Project Files
  • Opening New Project Files
• Using 3D Structured Light with RSTRENG
  • Accurate 3D measurements
  • Pipeline Analysis in Figure
• Mitigation/Repair
  • Repairs
  • Mitigation
• Documentation (Complete)
• Additional Training

Section 5 | References

• NACE Standard RPO102 (latest revision), “In-Line Inspection of Pipelines” Houston, TX
• NACE Standard RP0313 (latest revision), “Guided Wave Applications for Pipelines”, Houston, TX
• NACE Standard RP0502 (latest revision), “Pipeline External Corrosion Direct Assessment Methodology”, Houston, TX
• ASME B31.8 (latest revision), Gas Transmission and Distribution Piping, New York, New York
• ASME B31.8S (latest revision), Gas Transmission and Distribution Piping, New York, New York
• ASME B31.G (latest revision), ASME B31G – Manual for Determining the Remaining Strength of Corroded Pipelines (RSTRENG), New York, New York

Other Related Links

Pipeline HUB — User Resources
PRCI RSTRENG — User Guide
RSTRENG+ Demo Video