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V-1349 — Sour Water Column V-1349

Fluid Catalytic Cracker · Sour Water service · Installed Aug 26, 2009 (17 yrs in service)

Medium
Current Min. Thickness
0.328 in
t-min 0.283 in
Measured Corrosion Rate
2.24 mpy
ML-predicted: 5.32 mpy
Remaining Life
20.1 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 Duplex 2205
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency1.00
Design Pressure107 psig
Design Temperature350 °F
Operating Pressure59 psig
Operating Temperature303 °F
Diameter132 in
Nominal Thickness0.383 in
Corrosion Allowance0.0625 in
H2S / Chloride84 / 13 ppm
Flow Velocity2.9 ft/s
Process pH4.35
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
6.82 mpy
Predicted corrosion rate under these conditions (+4.58 mpy vs. current measured rate)
Implied Remaining Life
6.6 yrs
Implied Reinspection Interval
3.3 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 + RT60.3448 in0.3283 in
Jul 30, 2025UT Spot60.3473 in0.3284 in
May 7, 2022UT Spot60.3556 in0.3393 in
Dec 10, 2019UT Spot60.3623 in0.3431 in
Oct 29, 2017UT Grid + RT60.3688 in0.3647 in
Oct 9, 2015UT Spot60.3690 in0.3652 in
Jul 21, 2012UT Spot60.3769 in0.3569 in