CONCEPT DEMONSTRATION
66Phillips 66Vessel Integrity Intelligence
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V-1253 — Sour Water Column V-1253

Delayed Coker · Sour Water service · Installed Aug 31, 1988 (38 yrs in service)

Medium
Current Min. Thickness
1.558 in
t-min 1.424 in
Measured Corrosion Rate
0.59 mpy
ML-predicted: -0.40 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 Efficiency0.85
Design Pressure506 psig
Design Temperature145 °F
Operating Pressure426 psig
Operating Temperature106 °F
Diameter94 in
Nominal Thickness1.592 in
Corrosion Allowance0.0938 in
H2S / Chloride763 / 46 ppm
Flow Velocity1.1 ft/s
Process pH5.32
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 (-0.49 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 + RT61.5682 in1.5576 in
Oct 23, 2024UT Grid + RT61.5733 in1.5705 in
Apr 27, 2023UT Spot61.5701 in1.5627 in
Apr 19, 2020UT Spot61.5705 in1.5628 in
May 2, 2017UT Grid (API 572)61.5758 in1.5699 in
May 15, 2014UT Grid + RT61.5769 in1.5751 in
Jul 10, 2011UT Grid + RT61.5764 in1.5670 in
Aug 30, 2008UT Spot61.5775 in1.5755 in
Aug 26, 2006UT Spot61.5842 in1.5725 in
May 29, 2004UT Grid + RT61.5820 in1.5749 in
Sep 10, 2002UT Spot61.5824 in1.5810 in
Mar 28, 2000UT Grid + RT61.5878 in1.5758 in
Feb 22, 1997UT Grid + RT61.5873 in1.5687 in
Jul 5, 1995UT Grid + RT61.5835 in1.5812 in
Jul 18, 1993UT Grid (API 572)61.5907 in1.5782 in
Dec 18, 1990UT Grid + RT61.5892 in1.5887 in