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51314-4050-An Approach to Conduct a Pipeline Integrity Assessment when Operating Data is Limited

Picture for An Approach to Conduct a Pipeline Integrity Assessment when Operating Data is Limited
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Product Number: 51314-4050-SG
ISBN: 4050 2014 CP
Author: Joseph Morris
Publication Date: 2014
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This paper discusses a generalised approach for conducting an integrity assessment of a crude oil pipeline where the limited availability of current and historical operating data makes the full use of NACE Internal Corrosion Direct Assessment (ICDA) procedures as well as commonly available corrosion rate models unsuitable.Section 3 in each of the different Direct Assessment procedures describes the quantity of data required and does not strictly allow progression to the later stages unless this data set is complete. Unfortunately experience has shown that in many cases due to combinations of: changes in operator / ownership high staff turnover rates changes in internal organisation and an ageing pipeline infrastructure a complete “set” of data (compliant with Direct Assessment requirements) is rarely achieved.Missing data can result in either overly pessimistic or overly optimistic assumptions being made. The former could lead to increased inspections / ILI runs (with corresponding cost implications) whilst the latter could lead to assuming non-corrosive conditions are present (with corresponding increased risk in operational problems).The methodology developed allows a considered integrity assessment to be performed despite a paucity of operational data. Various different aspects from ICDA are considered in addition to in-line inspections (ILIs) and UT field verifications. These include: verification of corrosion patterns from ILIs by assessing areas of the pipeline at risk of significant water hold-up considering realistic ongoing corrosion rates based on different approaches in the examination of available inspection data (including statistical comparison of historic inspection programmes where possible) and projected “fitness-for-service” assessments based on existing and predicted condition of metal loss features and operational parameters. 
This paper discusses a generalised approach for conducting an integrity assessment of a crude oil pipeline where the limited availability of current and historical operating data makes the full use of NACE Internal Corrosion Direct Assessment (ICDA) procedures as well as commonly available corrosion rate models unsuitable.Section 3 in each of the different Direct Assessment procedures describes the quantity of data required and does not strictly allow progression to the later stages unless this data set is complete. Unfortunately experience has shown that in many cases due to combinations of: changes in operator / ownership high staff turnover rates changes in internal organisation and an ageing pipeline infrastructure a complete “set” of data (compliant with Direct Assessment requirements) is rarely achieved.Missing data can result in either overly pessimistic or overly optimistic assumptions being made. The former could lead to increased inspections / ILI runs (with corresponding cost implications) whilst the latter could lead to assuming non-corrosive conditions are present (with corresponding increased risk in operational problems).The methodology developed allows a considered integrity assessment to be performed despite a paucity of operational data. Various different aspects from ICDA are considered in addition to in-line inspections (ILIs) and UT field verifications. These include: verification of corrosion patterns from ILIs by assessing areas of the pipeline at risk of significant water hold-up considering realistic ongoing corrosion rates based on different approaches in the examination of available inspection data (including statistical comparison of historic inspection programmes where possible) and projected “fitness-for-service” assessments based on existing and predicted condition of metal loss features and operational parameters. 
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