CONCEPT DEMONSTRATION
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V-1325 — Sour Water Column V-1325

Crude Distillation Unit · Sour Water service · Installed Aug 31, 1988 (38 yrs in service)

Medium
Current Min. Thickness
0.226 in
t-min 0.121 in
Measured Corrosion Rate
0.81 mpy
ML-predicted: -0.89 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 Pressure52 psig
Design Temperature186 °F
Operating Pressure37 psig
Operating Temperature142 °F
Diameter93 in
Nominal Thickness0.275 in
Corrosion Allowance0.0938 in
H2S / Chloride678 / 120 ppm
Flow Velocity17.4 ft/s
Process pH7.75
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 (-0.71 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 Spot80.2441 in0.2257 in
Jun 2, 2026UT Spot80.2415 in0.2217 in
Mar 26, 2023UT Grid + RT80.2473 in0.2460 in
May 21, 2021UT Grid + RT80.2488 in0.2375 in
Apr 18, 2019UT Spot80.2487 in0.2364 in
Jan 16, 2016UT Spot80.2482 in0.2400 in
Jul 3, 2013UT Grid + RT80.2553 in0.2480 in
May 3, 2011UT Grid + RT80.2588 in0.2581 in
Jul 15, 2009UT Grid (API 572)80.2556 in0.2469 in
Aug 11, 2007UT Grid + RT80.2599 in0.2516 in
Dec 23, 2004UT Grid + RT80.2638 in0.2494 in
Mar 15, 2002UT Spot80.2665 in0.2479 in
Jan 13, 2000UT Grid (API 572)80.2648 in0.2522 in
Aug 29, 1998UT Spot80.2687 in0.2600 in
Mar 15, 1996UT Spot80.2690 in0.2668 in
Apr 25, 1993UT Grid + RT80.2684 in0.2571 in
Nov 13, 1991UT Grid + RT80.2671 in0.2538 in