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V-1076 — Wet CO2 Gas Drum V-1076

Alkylation Unit · Wet CO2 Gas service · Installed Aug 26, 2008 (18 yrs in service)

Low
Current Min. Thickness
1.455 in
t-min 1.320 in
Measured Corrosion Rate
0.63 mpy
ML-predicted: 1.29 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 Pressure583 psig
Design Temperature131 °F
Operating Pressure455 psig
Operating Temperature80 °F
Diameter89 in
Nominal Thickness1.477 in
Corrosion Allowance0.1250 in
H2S / Chloride23 / 161 ppm
Flow Velocity20.3 ft/s
Process pH8.85
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
0.10 mpy
Predicted corrosion rate under these conditions (-0.53 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 + RT81.4694 in1.4547 in
Aug 17, 2026UT Grid (API 572)81.4644 in1.4461 in
Mar 14, 2025UT Grid + RT81.4680 in1.4657 in
May 14, 2022UT Spot81.4692 in1.4559 in
Mar 22, 2019UT Grid (API 572)81.4707 in1.4570 in
Sep 8, 2016UT Grid (API 572)81.4756 in1.4684 in
Jun 19, 2013UT Grid + RT81.4763 in1.4659 in
Apr 6, 2011UT Grid + RT81.4768 in1.4746 in