Crisis Averted: Finding the Wrong Material Before It’s Too Late
The Case of the Mismatched Material: A CML Success Story
The Setup: Anticipated Performance
The piping circuit in question was designed and fabricated using 5Cr-0.5Mo (ASTM A335 P5). To monitor the health of the system, a series of Corrosion Monitoring Locations (CMLs) were established and tracked using Visions Enterprise®. For years, the data trended exactly as expected; both short- and long-term corrosion rates remained well within the acceptable anticipated range.
The Change: Shifting Operating Conditions
As unit throughput increased to meet rising production demands, the operating temperature began to creep upward. While these changes were necessary for the business, they created a more aggressive environment inside the pipes – specifically increasing the risk of sulphidation.
The Discovery: Data Doesn't Lie
During a scheduled CML inspection, field measurements were taken and uploaded directly to Visions via the integrated datalogger connector. The impact was immediate. Once the data hit the system, Visions recalculated the metrics and instantly flagged several CMLs for:
- Abnormal high corrosion rates.
- A significantly shorter remaining life.
- An accelerated "Next Inspection Date".
The Revelation: A Material Mix-up
The flagging triggered an immediate field evaluation. Inspectors discovered that a small section of the pipe was corroding at a much faster rate than the surrounding circuit. The investigation revealed a startling fact: the section was not the specified 5Cr-0.5Mo alloy, but rather ASTM A106 Grade B carbon steel.
While the carbon steel had held up under original conditions, the increased operating temperatures accelerated sulphidation at a rate the material couldn’t handle.
The Result: Risk Mitigated
Because Visions Enterprise provided an immediate “revelation” of the changing data trends, the client was able to replace the carbon steel section during a planned window. What could have been a catastrophic loss of containment was instead transformed into a routine maintenance success story.
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