Stress Corrosion Cracking in Pipelines
| September 26, 2007 |
1:30pm - 4:30pm |
| September 27, 2007 |
9am - 4pm |
| September 28, 2007 |
|
9am - 4pm |
Course Objectives
On completion of the course, participants will have a solid understanding of the procedures, strengths, limitations, and applicability of various Direct Assessment technologies and methods as they relate to pipeline inspection and integrity assessment for compliance with DOT regulations, and of the related industry codes and standards which will be reviewed and explained.
Who should attend
Pipeline engineers, designers and service professionals who are involved with the maintenance, inspection, and repair of pipelines.
Lecturer
Dr. Raymond R. Fessler worked on the Pipeline Research Committee project on SCC since its inception in 1965. He personally conducted most of the early field investigations of SCC, from which he identified the major factors that cause high-pH SCC in pipelines. He also managed the laboratory portion of that program from 1965 to 1982, which added significantly to an understanding of the phenomenon and explored a number of possible solutions to the problem. For the past several years, he has been the SCC consultant for GRI and PRCI. He recently completed a comprehensive gap analysis on SCC, and he actively participated in drafting the NACE Recommended Practice on SCC Direct Assessment.
Course Notes
Included with the course fee are detailed course notes in ring-binder format for reference.
Continuing Education Units
Upon completion of the course, participants will be eligible to receive 1.2 Continuing Education Units (CEUs).
DAY 1
Description of SCC
- Definition
- Causes
- Appearance
- Other forms of environmental-assisted cracking
History of SCC in pipelines
- High-pH SCC
- Near-neutral-pH SCC
- Internal SCC
Stages of SCC
- Pre-initiation
- Initiation
- Growth models
- Early growth
- Dormancy and re-initiation
- Late growth
- Final fracture
DAY 2
Test techniques to study SCC
- Accelerated testing
- Electrochemical tests
- Cracking tests
- Measuring crack growth
Environmental factors
- Field observations
- Liquid composition and concentration
- Electrochemical potential
- Temperature
Stress factors
- Field observations
- Importance of strain rate
- Cyclic loading
- Sources of stress
Metallurgical factors
- Pipe grade
- Steel composition
- Mechanical properties
- Microstructure
- Manufacturer
Mechanisms of SCC
- High-pH SCC
- Near-neutral-pH SCC
DAY 3
Likely locations for SCC
- Geographical
- Proximity to compressor or pump stations
- Proximity to other SCC
- Soil, terrain, moisture level
- Gas versus liquid pipelines
- Coating types and conditions
- Pressure history
- Corrosion history
- Pipe manufacturer
SCC detection and integrity assurance
- B31.8S
- Hydrostatic testing
- In-line inspection
- Direct assessment
Mitigating SCC
- Operating existing pipelines
- Designing new pipelines
- Repair methods
Integrity management plans
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