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09138 Using a Common Gas Source for Defining DG-ICDA Regions: A Case Study

Picture for 09138 Using a Common Gas Source for Defining DG-ICDA Regions: A Case Study
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Product Number: 51300-09138-SG
ISBN: 09138 2009 CP
Author: Jim Ponder and Adam Ray Gardner
Publication Date: 2009
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Defining the boundaries of DG-ICDA regions is a critical aspect of conducting Dry Gas Internal Corrosion Direct Assessment (DG-ICDA). Gas transmission pipeline operators with multiple laterals which originate from a common trunk line could conceivably consider each lateral or purchase point off the trunk line as individual DG-ICDA regions. This methodology can result in unnecessary digs and increased project reporting needs, ultimately increasing project scope. In cases where inline inspection was used as the integrity assessment methodology addressing internal corrosion on the trunk line, multiple laterals which tap off the same trunk line can be combined into one ICDA region. This paper shares a case study in conducting DG-ICDA by combining multiple laterals with take-off points from a common gas source into one ICDA Region, introduces a practice for establishing representative flow conditions to consider the impact of flow rate variability on direct examination site selection and elaborates on the interpretation of the gas hold-up equation.

Keywords: DG-ICDA, Dry Gas Internal Corrosion Direct Assessment, Case Study, Parametric Study
Defining the boundaries of DG-ICDA regions is a critical aspect of conducting Dry Gas Internal Corrosion Direct Assessment (DG-ICDA). Gas transmission pipeline operators with multiple laterals which originate from a common trunk line could conceivably consider each lateral or purchase point off the trunk line as individual DG-ICDA regions. This methodology can result in unnecessary digs and increased project reporting needs, ultimately increasing project scope. In cases where inline inspection was used as the integrity assessment methodology addressing internal corrosion on the trunk line, multiple laterals which tap off the same trunk line can be combined into one ICDA region. This paper shares a case study in conducting DG-ICDA by combining multiple laterals with take-off points from a common gas source into one ICDA Region, introduces a practice for establishing representative flow conditions to consider the impact of flow rate variability on direct examination site selection and elaborates on the interpretation of the gas hold-up equation.

Keywords: DG-ICDA, Dry Gas Internal Corrosion Direct Assessment, Case Study, Parametric Study
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