7/23/2019 Fitness for Service Level 3 Assessment – CorrosionErosion

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Case StudyFitness for Service Level 3 Assessment – Corrosion/Erosion 

Project Scope

> Definition of safe working pressure envelope forcorroded/eroded piping system based on highdefinition NDT scan data

Key Features

> Mapping of wall thickness data provided by

the operator’s inspection service contractor tostructural model

> By using a linearisation approach the currentutilisation factors were quantified to determine

the maximum line pressure that could behandled.

> Reduction in conservatism by using actual

mapped data rather than a simplified (worstcase) profile

> Forward prediction also undertaken todetermine change in wall loss over time and

associated change in utilisation factor