Stress Corrosion Cracking Course Syllabus
| August 27, 2007: 8am - 5pm |
| August 28, 2007: 8am - 5pm |
| August 29, 2007: 8am - Noon |
Although stress-corrosion cracking (SCC) is thought to be responsible for a relatively small percentage of pipeline failures each year, it continues to be a safety concern to pipeline operators and government regulatory agencies, and it must be addressed in integrity management plans.
This course will provide a detailed description of what is known about the appearance and causes of SCC, and it will discuss various approaches to mitigating and managing the problem. Practical information on recognizing and dealing with SCC will be presented along with descriptions of research results that have led to our current understanding of causes and methods of management.
Who Should Attend
- Pipeline engineers, designers, and service professionals who are involved with the maintenance, inspection, and repair of pipelines
- Researchers and regulatory personnel who want to be aware of the current understanding of SCC in pipelines
Documentation
Included with the course fee are detailed course notes including an extensive list of references as well as a CD containing the comprhensive 200-page Stress Corrosion Cracking Study produced in January 2005 for the US Office of Pipeline Safety.
Continuing Education Units (CEUs)
On completion of the course, participants will be awarded 1.2 CEUs.
Course Program
DAY 1
Description of SCC
- Definition
- Causes
- High-pH SCC
- Near-neutral-pH SCC
- Internal SCC
- Other forms of environmental-assisted cracking
History of SCC in pipelines
- High-pH SCC
- Near-neutral-pH SCC
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
Stages of SCC
- Pre-initiation
- Initiation
- Growth models
- Early growth
- Dormancy and re-initiation
- Late growth
- Final fracture
Environmental factors
- Field observations
- Liquid composition and concentration
- Electrochemical potential
- Temperature
- Importance of coatings
- Surface feature
DAY 2
Stress factors
- Field observations
- Importance of strain rate
- Cyclic loading
- Sources of stress
Metallurgical factors
- Pipe grade
- Steel composition
- Mechanical properties
- Microstructure
- Manufacturer
Integrity management plans
Defining and prioritizing susceptible segments
- B31.8S
- Ranking factors for prioritizing
- Weighting factors
Evaluating the severity of SCC
- Sizing
- Categorizing
- Implications
Hydrostatic testing
- Optimum procedure
- Intervals for re-testing
In-line inspection
- Magnetic flux leakage
- Ultrasonics
- Re-assessment intervals
SCC direct assessment
- Data collection
- Dig-site selection
- Number of digs
- Re-assessment intervals
- Field procedures
- Post assessment
DAY 3
Mitigating SCC
- Pipe replacement
- Repair options
- Temperature
- Coating
- Design
Remaining issues
Sizing stress-corrosion cracks
- Demonstration of magnetic-particle inspection
- Demonstration of shear wave ultrasonics
- Discussion of phased-array ultrasonics
- Demonstration of eddy-current measurements
- Discussion of accuracy
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