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Corrosion CUI Petrochemical Inspection

Corrosion Management & CUI Assessment

Corrosion under insulation (CUI) management program for petrochemical plant piping

Overview

Project Overview

AETERNA developed and implemented a corrosion under insulation (CUI) management program for a large petrochemical plant. Scope included CUI risk assessment, targeted inspection using advanced NDT, and development of a long-term corrosion management strategy aligned with API 571 and API 574.

01
Locations

500+ CUI-susceptible locations assessed

02
Risk-Based

CUI ranking by temperature, coating, insulation type

03
Savings

40% cost reduction via risk-based prioritization

Challenge

The Challenge

Extensive insulated piping with limited inspection history. Operating temperatures placed most piping in the CUI-susceptible zone. Access constraints required scaffolding and insulation removal planning.

Over 60% of insulated piping was in the CUI-critical range (10F to 350F) with no prior inspection records.
Solution

Our Solution

We performed CUI risk ranking based on operating temperature, pipe material, coating condition, and insulation type. Targeted inspection locations were selected using risk-based methodology. NDT included real-time radiography, profile radiography, and guided wave UT.

1

Risk Ranking

All insulated piping assessed for CUI risk per API 571

2

Inspection

Risk-prioritized inspection using RTR, profile RT, guided wave UT

3

CUI Plan

Long-term strategy with schedules, coating upgrades, and mitigation

Results

Key Results

Measurable outcomes delivered through our technical expertise and commitment to quality.

500+
Locations
3-Year
Plan
40%
Savings
100%
API 571

Ready to Discuss Your Project?

Contact our corrosion management team to develop a CUI inspection program for your facility.

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