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V-1068 — Vacuum Gas Oil Drum V-1068

Hydrocracker · Vacuum Gas Oil service · Installed Aug 23, 2020 (6 yrs in service)

High
Current Min. Thickness
0.845 in
t-min 0.879 in
Measured Corrosion Rate
22.46 mpy
ML-predicted: 17.10 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 Efficiency1.00
Design Pressure563 psig
Design Temperature300 °F
Operating Pressure478 psig
Operating Temperature259 °F
Diameter77 in
Nominal Thickness0.995 in
Corrosion Allowance0.0625 in
H2S / Chloride36 / 202 ppm
Flow Velocity14.2 ft/s
Process pH6.28
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
16.59 mpy
Predicted corrosion rate under these conditions (-5.87 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 Spot80.8592 in0.8454 in
Aug 9, 2026UT Grid (API 572)80.8608 in0.8511 in
Jun 6, 2023UT Grid + RT80.9292 in0.9209 in