Gas Technology Institute
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Leak Versus Rupture Considerations for Steel Lo...

SKU: GRI-00/0232
Leak Versus Rupture Considerations for Steel Low-Stress Pipelines

This report evaluates the occurrence of leaks versus rupture as a function of wall stress (pressure), with a focus on operations and maintenance issues in low-wall-stress natural gas pipelines operating through high-consequence areas. "Low stress" pipelines can be reasonably defined as pipelines operating at stresses between 20 and 40 percent of specified minimum yield stress (SMYS).
Document Type
Report
Report Type
Final Report
Report Period
03/00 - 01/01
Corporate Source
Battelle Memorial Institute, Columbus, OH
Sponsor
GRI, Des Plaines, IL
Pagination
35p
Product Media
PDF Download
$295.00 / Each
 
Availability: In Stock
Summary:
This report evaluates the occurrence of leaks versus rupture as a function of wall stress (pressure), with a focus on operations and maintenance issues in low-wall-stress natural gas pipelines operating through high-consequence areas. "Low stress" pipelines can be reasonably defined as pipelines operating at stresses between 20 and 40 percent of specified minimum yield stress (SMYS). Potential threats to the integrity of low-stress pipelines were identified, and worst-case scenarios for these threats were evaluated. The evaluation is based on an assessment of existing full-scale test data, incident experience in the U.S., and mechanics and fracture calculations. Results indicate the leak to rupture transition for corrosion defects in the low-wall-stress pipeline system can be taken as 30 percent of SMYS, a value that is conservative in comparison with in-service incidents. Work on the threshold for delayed mechanical damage is incomplete, but is currently taken to be 25 percent of SMYS. The main conclusion of the study is that thresholds for the transition from leak to rupture are consistent with the current regulatory provisions for low-wall-stress pipelines.
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