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V-1092 — Wet CO2 Gas Column V-1092

Catalytic Reformer · Wet CO2 Gas service · Installed Aug 27, 2007 (19 yrs in service)

Low
Current Min. Thickness
1.311 in
t-min 1.142 in
Measured Corrosion Rate
0.50 mpy
ML-predicted: -0.42 mpy
Remaining Life
60+ 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-516-70 Carbon Steel
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency1.00
Design Pressure345 psig
Design Temperature480 °F
Operating Pressure297 psig
Operating Temperature329 °F
Diameter131 in
Nominal Thickness1.317 in
Corrosion Allowance0.1250 in
H2S / Chloride32 / 187 ppm
Flow Velocity5.5 ft/s
Process pH8.05
InsulatedNo

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
0.10 mpy
Predicted corrosion rate under these conditions (-0.40 mpy vs. current measured rate)
Implied Remaining Life
60+ yrs
Implied Reinspection Interval
10.0 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)81.3121 in1.3112 in
Jul 29, 2025UT Spot81.3125 in1.3061 in
Jul 29, 2022UT Grid (API 572)81.3119 in1.2954 in
Jan 24, 2020UT Grid + RT81.3148 in1.3121 in
Oct 24, 2016UT Spot81.3113 in1.2970 in
Apr 16, 2015UT Grid + RT81.3225 in1.3081 in
Jul 20, 2013UT Grid + RT81.3123 in1.3060 in
Nov 19, 2011UT Grid (API 572)81.3122 in1.3015 in
Apr 28, 2010UT Grid (API 572)81.3223 in1.3044 in