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66Phillips 66Vessel Integrity Intelligence
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V-1039 — Crude Oil Drum V-1039

Fluid Catalytic Cracker · Crude Oil service · Installed Aug 28, 2002 (24 yrs in service)

Critical
Current Min. Thickness
0.443 in
t-min 0.672 in
Measured Corrosion Rate
13.81 mpy
ML-predicted: 15.50 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency1.00
Design Pressure414 psig
Design Temperature682 °F
Operating Pressure365 psig
Operating Temperature560 °F
Diameter57 in
Nominal Thickness0.787 in
Corrosion Allowance0.0938 in
H2S / Chloride30 / 169 ppm
Flow Velocity4.0 ft/s
Process pH8.09
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
13.24 mpy
Predicted corrosion rate under these conditions (-0.57 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 — Naphthenic Acid Corrosion

API 571 §4.2.10

Aggressive, velocity-assisted corrosion in high-TAN crude fractions, most severe 450–750°F; low-alloy/carbon steel is far more susceptible than Mo-bearing or 316 SS.

Recommended inspection approach: UT thickness at high-velocity/turbulent locations; feed TAN monitoring; consider alloy upgrade per API 571 guidance.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid + RT80.4533 in0.4426 in
Apr 14, 2024UT Spot80.4888 in0.4850 in
Jun 2, 2021UT Grid + RT80.5298 in0.5190 in
Mar 12, 2018UT Grid (API 572)80.5735 in0.5610 in
Mar 15, 2015UT Grid (API 572)80.6110 in0.6071 in
May 12, 2013UT Spot80.6405 in0.6334 in
Apr 23, 2011UT Grid + RT80.6695 in0.6613 in
Jun 14, 2008UT Spot80.7064 in0.6949 in
Apr 20, 2005UT Grid + RT80.7495 in0.7434 in