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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
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External Corrosion Direct Assessment Procedure – RSTRENG
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