Gas Technology Institute
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Schedule of Responses to Corrosion-Caused Metal...

SKU: GRI-01/0085
Schedule of Responses to Corrosion-Caused Metal Loss Revealed by Integrity-Assessment Results

This report presents a schedule for responses by a gas pipeline operator to the receipt of corrosion defect information from a pipeline integrity assessment. The schedules are intended to apply to pipeline assessments relating to external or internal corrosion-caused metal loss.
Document Type
Report
Report Type
Topical Report
Corporate Source
HSB Reliability Technologies; Kiefner & Associates, Worthington, OH
Sponsor
GRI, Des Plaines, IL
Pagination
11p
Product Media
PDF Download
$295.00 / Each
 
Availability: In Stock
Summary:
This report presents a schedule for responses by a gas pipeline operator to the receipt of corrosion defect information from a pipeline integrity assessment. The schedules are intended to apply to pipeline assessments relating to external or internal corrosion-caused metal loss. The schedules are primarily useful in the case of in-line inspection results. The key parameter in the assessment is the calculated failure pressure of the pipe, expressed as a fraction of the maximum allowable operating pressure (MAOP). Criterion such as American Society of Mechanical Engineers (ASME) B31.G, "modified B31.G", or equivalent may be used for the determination of the predicted failure pressure. The timing of repairs ranges from under 5 days for defects classified as "immediate response" anomalies to ten years for small corrosion defects that are predicted to grow to a failure pressure equivalent to the pipe yield stress. For example, reported anomalies with indicated depths exceeding 80 percent of the wall thickness of the pipe should be excavated and examined with 6 months. Probabilistic-based scheduling and direct examination of anomalies are discussed.
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