CONCEPT DEMONSTRATION
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V-1232 — Catalyst Slurry Drum V-1232

Delayed Coker · Catalyst Slurry service · Installed Aug 30, 1992 (34 yrs in service)

Low-Medium
Current Min. Thickness
0.241 in
t-min 0.189 in
Measured Corrosion Rate
1.01 mpy
ML-predicted: 1.87 mpy
Remaining Life
51.2 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 Pressure95 psig
Design Temperature738 °F
Operating Pressure66 psig
Operating Temperature482 °F
Diameter53 in
Nominal Thickness0.291 in
Corrosion Allowance0.0625 in
H2S / Chloride21 / 32 ppm
Flow Velocity3.5 ft/s
Process pH8.96
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
1.16 mpy
Predicted corrosion rate under these conditions (+0.15 mpy vs. current measured rate)
Implied Remaining Life
44.5 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 — Erosion-Corrosion

API 571 §4.2.13

Mechanical removal of protective scale by high-velocity flow or entrained solids, accelerating the underlying corrosion mechanism.

Recommended inspection approach: UT thickness at flow-direction changes (elbows, reducers); review process velocity against API RP 14E erosional velocity limits.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid (API 572)80.2540 in0.2408 in
Aug 16, 2024UT Grid (API 572)80.2556 in0.2550 in
May 21, 2021UT Grid (API 572)80.2599 in0.2553 in
Jul 22, 2019UT Spot80.2626 in0.2584 in
Jun 12, 2017UT Grid + RT80.2679 in0.2623 in
Jan 27, 2016UT Grid (API 572)80.2681 in0.2518 in
Aug 11, 2014UT Grid (API 572)80.2685 in0.2658 in
Dec 25, 2011UT Spot80.2673 in0.2512 in
Mar 7, 2010UT Grid + RT80.2731 in0.2558 in
Sep 3, 2008UT Grid + RT80.2747 in0.2640 in
Apr 7, 2007UT Grid + RT80.2753 in0.2567 in
Aug 2, 2004UT Grid + RT80.2755 in0.2664 in
May 6, 2001UT Spot80.2778 in0.2601 in
Jul 10, 1999UT Grid + RT80.2818 in0.2707 in
Oct 17, 1997UT Grid + RT80.2837 in0.2773 in
Oct 10, 1994UT Grid (API 572)80.2880 in0.2780 in