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	Illustration of failure from reeling and service fatigue during full-scale testing of pipes.

What Is FlawPRO?

FlawPRO is a computer program developed and validated by Southwest Research Institute (SwRI) against full-scale pipe test data as part of a Joint Industry Program (JIP) titled Validation of a Methodology for Assessing Defect Tolerance of Welded Reeled Risers and Flowlines that involved major companies in the offshore industry, including four oil companies, a pipe manufacturer, and a pipeline installer. Although designed to perform engineering critical assessment (ECA) for pipes subjected to high strain when installed by the reeling process, FlawPRO can also perform ECA for conventionally installed pipes.

What Makes FlawPRO Different?

FlawPRO will automatically calculate acceptable flaw sizes that can be used to set inspection limits for welds. The methodology used to determine flaw extension during reeling is based on a validated physical (tear-fatigue) model that incorporates both ductile tearing and low cycle fatigue.

What Are the ECA Calculations Performed by FlawPRO?

• Lifetimes under service, reeling and service, and reeling conditions

• Flaw extensions under service, reeling and service, and reeling conditions

• Acceptable flaw sizes for inspection under service, and reeling and service conditions

• Critical flaw sizes

What Technologies Are Employed in FlawPRO?

• J-based equivalent to BS 7910 Level 2B (material specific) Failure Assessment Diagram (FAD)

• Weight function method for stress intensity factors

• Validated tearing and low-cycle fatigue flaw extension model for reeling

• BS 7910 based stress analysis for weld geometrical discontinuities and misalignment

Has FlawPRO Been Used on Projects?

FlawPRO has been used to perform ECA to derive acceptable flaw sizes in support of offshore projects involving pipes installed by the reeling process and using conventional installation methods.

Example ECA calculation of acceptable flaw sizes for inspection computed using FlawPRO

What Validation Is Available for FlawPRO?

Full scale tests on pipes containing weld flaws subjected to a range of reeling scenarios and simulated high cycle fatigue service loads. Some of the validation results can be seen here.

For more information about FlawPRO capabilities at SwRI or a FlawPRO license, please contact Graham Chell, Ph.D., at flawpro@swri.org or (210) 522-6810.

flawpro.swri.org

| Materials Engineering Department | Mechanical Engineering Division | SwRI Home |

Southwest Research Institute^® (SwRI^®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

January 03, 2013