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Periodic Re-Verification Intervals for High-Con...

SKU: GRI-00/0230
Periodic Re-Verification Intervals for High-Consequence Areas

Factors that are potential threats to the integrity of natural gas transmission pipelines were evaluated to determine the interval at which the integrity of the pipeline must be re-verified to ensure safe operation in high-consequence areas. Corrosion is the primary factor controlling the re-verification interval.
Document Type
Report
Report Type
Topical Report
Corporate Source
Battelle Memorial Institute, Columbus, OH
Sponsor
Gas Research Institute, Des Plaines, IL
Pagination
53p
Product Media
PDF Download
$295.00 / Each
 
Availability: In Stock
Summary:
Factors that are potential threats to the integrity of natural gas transmission pipelines were evaluated to determine the interval at which the integrity of the pipeline must be re-verified to ensure safe operation in high-consequence areas. Corrosion is the primary factor controlling the re-verification interval. The time interval for integrity to potentially be reduced to a level that requires re-verification was determined in terms of stress and wall thickness as a function of design factor. Worst-case corrosion kinetics derived from the Office of Pipeline Safety (OPS) incident database indicated the re-verification interval for Class 3 and 4 designs was 16 years to avoid leaks or ruptures. For Class 1 designs the results indicated an interval of 11.4 years. If average corrosion kinetics were adopted instead of worst-case rates, the re-verification intervals would be about three times longer. Fatigue and stress-corrosion cracking were indicated to be unlikely threats in Class 3 and 4 designs. A prescriptive framework was found inappropriate for features like weld-seam defects and hard spots, as well as for corrosion driven by locally unique factors.
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