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V-1286 — Crude Oil Vessel V-1286

Sulfur Recovery Unit · Crude Oil service · Installed Aug 28, 2000 (26 yrs in service)

Critical
Current Min. Thickness
0.306 in
t-min 0.633 in
Measured Corrosion Rate
20.00 mpy
ML-predicted: 19.70 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-240-304L Stainless
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency0.85
Design Pressure182 psig
Design Temperature413 °F
Operating Pressure145 psig
Operating Temperature387 °F
Diameter98 in
Nominal Thickness0.809 in
Corrosion Allowance0.1250 in
H2S / Chloride34 / 254 ppm
Flow Velocity20.7 ft/s
Process pH4.32
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
15.21 mpy
Predicted corrosion rate under these conditions (-4.79 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 + RT60.3166 in0.3058 in
Dec 2, 2025UT Spot60.3166 in0.3005 in
Aug 30, 2023UT Grid (API 572)60.3166 in0.2991 in
Nov 19, 2021UT Grid (API 572)60.3166 in0.3061 in
Aug 18, 2018UT Spot60.3330 in0.3194 in
Dec 19, 2015UT Grid (API 572)60.4069 in0.4037 in
Mar 25, 2014UT Spot60.4499 in0.4308 in
Mar 30, 2011UT Grid + RT60.5261 in0.5252 in
Jun 3, 2008UT Grid + RT60.6026 in0.6026 in
Jan 17, 2006UT Grid (API 572)60.6697 in0.6561 in
Jul 20, 2004UT Spot60.7077 in0.7058 in
Oct 25, 2002UT Spot60.7486 in0.7461 in