The scope A major operator had identied the need to continue operating the pipelines in two major North sea elds. The operator asked us to perform lifetime extension (LTE) assessments for all the pipelines approaching or beyond their initial design life. This included: 1 x 10” production pipeline with piggybacked 4” gas lift pipeline 1 x 6” water injection pipeline 1 x 4” gas lift pipeline 1 x 12” gas pipeline 2 x 6” gas tie-in spools 1 x 10” gas pipeline 2 x 8” gas tie-in spools The solution The general methodology was based on denitions in NORSOK ISO/TS 12747 andY-002. Each pipeline was individually assessed using the operational history, subsea inspection data and corrosion modelling to determine the current integrity and any necessary remedial measures. The future life needs, threat

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