CONCEPT DEMONSTRATION
66Phillips 66Vessel Integrity Intelligence
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V-1228 — Crude Oil Drum V-1228

Delayed Coker · Crude Oil service · Installed Aug 30, 1992 (34 yrs in service)

Medium
Current Min. Thickness
0.409 in
t-min 0.316 in
Measured Corrosion Rate
0.56 mpy
ML-predicted: 0.54 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 Pressure159 psig
Design Temperature170 °F
Operating Pressure128 psig
Operating Temperature129 °F
Diameter79 in
Nominal Thickness0.441 in
Corrosion Allowance0.0625 in
H2S / Chloride25 / 165 ppm
Flow Velocity17.4 ft/s
Process pH5.32
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
0.10 mpy
Predicted corrosion rate under these conditions (-0.46 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 — High-Temperature Sulfidation

API 571 §4.2.11

Reaction of sulfur compounds with steel at high temperature (>500°F) in the absence of water; rate governed by sulfur content, temperature, alloy content.

Recommended inspection approach: UT thickness per Modified McConomy-curve risk ranking; RT/UT at known high-rate locations identified by process simulation.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid + RT40.4231 in0.4091 in
Nov 27, 2025UT Grid + RT40.4197 in0.4143 in
Apr 23, 2023UT Grid + RT40.4236 in0.4118 in
Jul 27, 2020UT Grid (API 572)40.4279 in0.4211 in
Feb 6, 2018UT Grid + RT40.4284 in0.4254 in
Aug 15, 2015UT Grid + RT40.4289 in0.4166 in
Oct 20, 2012UT Grid (API 572)40.4325 in0.4290 in
Feb 26, 2010UT Spot40.4339 in0.4150 in
Mar 3, 2007UT Grid (API 572)40.4321 in0.4212 in
Jun 9, 2005UT Grid (API 572)40.4314 in0.4181 in
Oct 10, 2002UT Spot40.4358 in0.4316 in
Jun 26, 2000UT Grid + RT40.4337 in0.4285 in
Apr 12, 1998UT Grid + RT40.4374 in0.4274 in
Jun 6, 1996UT Grid + RT40.4424 in0.4352 in
Jan 17, 1994UT Grid + RT40.4420 in0.4301 in