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09147 Special Issues Related to Direct Assessment

Picture for 09147 Special Issues Related to Direct Assessment
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Product Number: 51300-09147-SG
ISBN: 09147 2009 CJ
Author: Ernest Klechka
Publication Date: 2009
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Pipeline companies often are required to evaluate the integrity of existing pipelines. The integrity of existing pipelines is important for assessing asset integrity, public safety and environmental safety.

Pipeline integrity can be evaluated using in-line inspection (ILI) tools, hydrostatic pressure testing, and direct assessment (DA). Depending upon the threat, three forms of DA can be used. These three forms of DA are external corrosion direct assessment (ECDA), dry gas - internal corrosion direct assessment (DG-ICDA), and stress corrosion cracking direct assessment (SSCDA).

Three direct assessment (DA) methodologies are available to the pipeline operator to assess the integrity of a pipeline segment. External Corrosion Direct Assessment (ECDA), Internal Corrosion Direct Assessment (ICDA) and Stress Corrosion Cracking Direct Assessment (SSCDA) all require risk assessments to determine the need, locations, and potential for corrosion. When possible all three Direct Assessment techniques can be applied simultaneously to the same segment of pipeline.

Selection of indirect inspection test methods and direct examination sites can be very complicated. Test methods used for direct examination may combine test methods for ECDA, ICDA and SSCDA.
Pipeline companies often are required to evaluate the integrity of existing pipelines. The integrity of existing pipelines is important for assessing asset integrity, public safety and environmental safety.

Pipeline integrity can be evaluated using in-line inspection (ILI) tools, hydrostatic pressure testing, and direct assessment (DA). Depending upon the threat, three forms of DA can be used. These three forms of DA are external corrosion direct assessment (ECDA), dry gas - internal corrosion direct assessment (DG-ICDA), and stress corrosion cracking direct assessment (SSCDA).

Three direct assessment (DA) methodologies are available to the pipeline operator to assess the integrity of a pipeline segment. External Corrosion Direct Assessment (ECDA), Internal Corrosion Direct Assessment (ICDA) and Stress Corrosion Cracking Direct Assessment (SSCDA) all require risk assessments to determine the need, locations, and potential for corrosion. When possible all three Direct Assessment techniques can be applied simultaneously to the same segment of pipeline.

Selection of indirect inspection test methods and direct examination sites can be very complicated. Test methods used for direct examination may combine test methods for ECDA, ICDA and SSCDA.
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Inspection of offshore pipelines is essential to provide vital information required for integrity assessment to allow data driven engineering decisions to be made and prevent costly failures. This paper presents experience from applying Internal Corrosion Direct Assessment (ICDA) for offshore pipelines in the North Sea.
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