A new internal corrosion risk management methodology was developed and applied on more than 1000 relief lines (RLs) in upstream production facilities. The new methodology is qualitative and focuses on probability of failure considering system corrosivity, and inspection findings. System corrosivity is determined based on multiple factors including service, pressure, design configuration, and material of construction. For each of these factors, a risk score is calculated, and an overall system corrosivity is calculated as a composite measure of all the factors. As for inspection findings, the corrosion rate was used to evaluate the extent of the damage. Through this qualitative methodology, a very large number of relief lines were assessed and prioritized for further inspection. The methodology was verified against field data as High-risk lines have shown more severe corrosion on average compared to Medium-risk lines. As of the time of this paper, Low-risk lines are yet to be assessed.

Subject
Nondestructive testing, Water, Materials, Piping, Corrosion rate, Under deposit corrosion, Inspection, Mechanical failure, Fluids, Internal corrosion, Wet gas, Risk management, Deposit corrosion
Keywords:
relief lines, corrosion assessment, risk assessment, corrosion control, corrosion mitigation, inspection, operational practices, oil and gas
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2023
Association for Materials Protection and Performance (AMPP)
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