CONCEPT DEMONSTRATION
66Phillips 66Vessel Integrity Intelligence
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V-1226 — Steam Drum V-1226

Delayed Coker · Steam service · Installed Aug 23, 2020 (6 yrs in service)

Medium
Current Min. Thickness
1.079 in
t-min 1.014 in
Measured Corrosion Rate
13.26 mpy
ML-predicted: 5.81 mpy
Remaining Life
4.9 yrs
Next Inspection Due
Feb 2, 2029
Interval: 2.5 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. 2
Joint Efficiency1.00
Design Pressure595 psig
Design Temperature140 °F
Operating Pressure463 psig
Operating Temperature95 °F
Diameter84 in
Nominal Thickness1.173 in
Corrosion Allowance0.1250 in
H2S / Chloride8 / 190 ppm
Flow Velocity16.2 ft/s
Process pH4.83
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
9.02 mpy
Predicted corrosion rate under these conditions (-4.24 mpy vs. current measured rate)
Implied Remaining Life
7.2 yrs
Implied Reinspection Interval
3.6 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 — Corrosion Under Insulation (CUI)

API 571 §4.3.5

Localized external corrosion beneath insulation where moisture is trapped, most severe in the 140–250°F operating band.

Recommended inspection approach: Insulation removal at high-risk locations (nozzles, low points), profile radiography, or guided-wave UT screening per API 570/RP 583.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid + RT81.0941 in1.0791 in
Jan 20, 2025UT Spot81.1138 in1.1023 in
Feb 6, 2022UT Spot81.1543 in1.1435 in