CONCEPT DEMONSTRATION
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V-1162 — Wet CO2 Gas Drum V-1162

Crude Distillation Unit · Wet CO2 Gas service · Installed Sep 1, 1985 (41 yrs in service)

Low
Current Min. Thickness
1.969 in
t-min 1.877 in
Measured Corrosion Rate
2.15 mpy
ML-predicted: 3.82 mpy
Remaining Life
42.8 yrs
Next Inspection Due
Aug 19, 2036
Interval: 10.0 yrs (API 510)

UT Thickness Trend

Minimum CML reading per inspection vs. ASME Sec. VIII t-min

Vessel Specification

MaterialSA-240-316L Stainless
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency0.85
Design Pressure625 psig
Design Temperature400 °F
Operating Pressure499 psig
Operating Temperature310 °F
Diameter83 in
Nominal Thickness2.061 in
Corrosion Allowance0.1250 in
H2S / Chloride4 / 70 ppm
Flow Velocity17.4 ft/s
Process pH8.61
InsulatedYes

Corrosion & Remaining-Life What-If

Adjust operating conditions to see the live model-predicted corrosion rate and implied remaining life

Live Prediction — What-If Model
4.87 mpy
Predicted corrosion rate under these conditions (+2.72 mpy vs. current measured rate)
Implied Remaining Life
18.9 yrs
Implied Reinspection Interval
9.5 yrs

What-if model: standardized Ridge regression, R² 0.56 on held-out fleet data (3.25 mpy MAE). Runs entirely client-side for instant feedback — see Model Insights for the full fleet-scale ensemble model used for official predictions.

Governing Damage Mechanism — CO2 (Sweet) Corrosion

API 571 §4.2.2

Carbonic-acid corrosion from dissolved CO2 in aqueous phases; rate peaks around 100–160°F and increases with velocity.

Recommended inspection approach: UT thickness grid focused on low points and water dropout locations; monitor produced-water chemistry.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid + RT81.9718 in1.9689 in
Jan 22, 2026UT Grid + RT81.9731 in1.9596 in
Nov 25, 2023UT Grid (API 572)81.9818 in1.9800 in
Apr 7, 2022UT Grid (API 572)81.9827 in1.9742 in
Jun 26, 2020UT Grid + RT81.9824 in1.9786 in
Feb 12, 2019UT Grid + RT81.9908 in1.9803 in
May 5, 2017UT Spot81.9927 in1.9833 in
Nov 17, 2014UT Spot81.9961 in1.9952 in
Dec 27, 2011UT Grid (API 572)82.0074 in1.9997 in
Jan 29, 2009UT Grid (API 572)82.0142 in1.9962 in
Oct 28, 2006UT Grid (API 572)82.0194 in2.0036 in
Dec 3, 2003UT Spot82.0250 in2.0213 in
Apr 9, 2002UT Grid + RT82.0286 in2.0238 in
Jan 4, 1999UT Grid (API 572)82.0308 in2.0177 in
Sep 30, 1995UT Grid + RT82.0396 in2.0226 in
Feb 1, 1993UT Spot82.0448 in2.0316 in
Jun 14, 1990UT Grid (API 572)82.0514 in2.0434 in
Jan 1, 1988UT Spot82.0540 in2.0410 in