CONCEPT DEMONSTRATION
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V-1324 — Wet CO2 Gas Drum V-1324

Delayed Coker · Wet CO2 Gas service · Installed Sep 1, 1984 (42 yrs in service)

Low
Current Min. Thickness
0.810 in
t-min 0.744 in
Measured Corrosion Rate
2.21 mpy
ML-predicted: 3.46 mpy
Remaining Life
30.3 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 Efficiency1.00
Design Pressure429 psig
Design Temperature329 °F
Operating Pressure362 psig
Operating Temperature258 °F
Diameter57 in
Nominal Thickness0.919 in
Corrosion Allowance0.1250 in
H2S / Chloride6 / 296 ppm
Flow Velocity6.1 ft/s
Process pH4.46
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
4.64 mpy
Predicted corrosion rate under these conditions (+2.43 mpy vs. current measured rate)
Implied Remaining Life
14.4 yrs
Implied Reinspection Interval
7.2 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 (API 572)80.8237 in0.8105 in
Feb 7, 2025UT Grid (API 572)80.8292 in0.8264 in
Aug 17, 2022UT Spot80.8344 in0.8262 in
Sep 29, 2019UT Spot80.8427 in0.8336 in
Nov 17, 2017UT Spot80.8462 in0.8268 in
Oct 4, 2014UT Grid + RT80.8538 in0.8525 in
Mar 25, 2013UT Grid (API 572)80.8545 in0.8499 in
Jan 31, 2010UT Grid + RT80.8660 in0.8568 in
Jan 30, 2007UT Spot80.8685 in0.8490 in
Dec 27, 2003UT Grid + RT80.8726 in0.8551 in
Nov 11, 2001UT Spot80.8821 in0.8638 in
Apr 2, 2000UT Grid + RT80.8823 in0.8718 in
May 9, 1997UT Grid (API 572)80.8882 in0.8787 in
Feb 25, 1994UT Grid + RT80.8975 in0.8827 in
Jan 26, 1992UT Spot80.9029 in0.8853 in
Sep 3, 1989UT Grid (API 572)80.9094 in0.8901 in
Dec 20, 1986UT Grid (API 572)80.9126 in0.8991 in