CONCEPT DEMONSTRATION
66Phillips 66Vessel Integrity Intelligence
← Vessel Registry

V-1151 — Hydrotreater Feed Drum V-1151

Delayed Coker · Hydrotreater Feed service · Installed Aug 29, 1998 (28 yrs in service)

Critical
Current Min. Thickness
0.235 in
t-min 0.491 in
Measured Corrosion Rate
16.02 mpy
ML-predicted: 11.99 mpy
Remaining Life
0.0 yrs
Next Inspection Due
Feb 20, 2027
Interval: 0.5 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 Efficiency0.85
Design Pressure386 psig
Design Temperature672 °F
Operating Pressure287 psig
Operating Temperature516 °F
Diameter50 in
Nominal Thickness0.671 in
Corrosion Allowance0.1250 in
H2S / Chloride24 / 0 ppm
Flow Velocity18.9 ft/s
Process pH7.12
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
11.03 mpy
Predicted corrosion rate under these conditions (-4.99 mpy vs. current measured rate)
Implied Remaining Life
0.0 yrs
Implied Reinspection Interval
0.5 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 (API 572)80.2457 in0.2351 in
Mar 30, 2025UT Spot80.2457 in0.2356 in
Jul 22, 2022UT Grid + RT80.2632 in0.2534 in
Oct 22, 2019UT Grid (API 572)80.3054 in0.2949 in
Sep 4, 2016UT Spot80.3624 in0.3595 in
Jul 27, 2013UT Grid + RT80.4157 in0.3982 in
May 21, 2011UT Grid + RT80.4503 in0.4407 in
Aug 8, 2009UT Grid + RT80.4823 in0.4764 in
May 7, 2007UT Grid + RT80.5236 in0.5050 in
Dec 5, 2004UT Spot80.5645 in0.5627 in
Aug 20, 2002UT Grid + RT80.6014 in0.5984 in
Apr 1, 2000UT Spot80.6433 in0.6417 in