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This paper reviews strategy for handling of life extension on old (17,000 km >35 years old, 55,000 > 25 years old) pipelines from preliminary assessment, through repair execution and post repair surveillance. Useful tips for avoiding common pitfalls are also presented.
According to Offshore Data Services there are approximately 17000 kilometers of offshore pipelines globally installed before 1981 (35 Years Ago) and before 1991 (25 Years Ago) the number is close to 55000 Kms. While a good number of these lines have been abandoned others are still in service and are now at or 10 years or more beyond their original design life. This paper reviews proven strategy for cost effective reliable handling of life extension on these old pipelines from preliminary assessment through repair execution and post repair surveillance. Useful tips for avoiding common pitfalls are also presented.KEYWORDS: Offshore Cathodic Protection Retrofit Life Extension Offshore Pipeline Pipeline Inspection Seawater Corrosion IMR Pipeline Clamp Pipeline ROV Survey
Key words: Offshore Cathodic Protection, Retrofit, Life Extension, Offshore Pipeline, Pipeline Inspection, Seawater Corrosion, IMR, Pipeline Clamp, Pipeline ROV Survey.
A new field gradient (FG) measurement tool has been developed for cathodic protection (CP) inspection of subsea facilities. The paper presents a case where FG data and CP modelling have been used to optimize CP retrofit design, cutting costs by 50%.
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A risk assessment model developed as part of a holistic study conducted to evaluate the condition of subsea pipelines. A systematic semi-quantitative risk-based model was developed to identify, analyze and evaluate risk associated with each subsea pipeline.