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V-1348 — Crude Oil Drum V-1348

Crude Distillation Unit · Crude Oil service · Installed Sep 1, 1984 (42 yrs in service)

Medium
Current Min. Thickness
0.271 in
t-min 0.198 in
Measured Corrosion Rate
1.05 mpy
ML-predicted: 2.09 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 Pressure192 psig
Design Temperature371 °F
Operating Pressure151 psig
Operating Temperature252 °F
Diameter41 in
Nominal Thickness0.326 in
Corrosion Allowance0.0938 in
H2S / Chloride16 / 57 ppm
Flow Velocity8.9 ft/s
Process pH8.54
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
5.27 mpy
Predicted corrosion rate under these conditions (+4.22 mpy vs. current measured rate)
Implied Remaining Life
13.8 yrs
Implied Reinspection Interval
6.9 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 (API 572)40.2807 in0.2709 in
Jul 22, 2026UT Spot40.2792 in0.2682 in
Jul 6, 2023UT Grid + RT40.2847 in0.2751 in
Mar 24, 2021UT Grid + RT40.2897 in0.2876 in
Feb 2, 2018UT Grid (API 572)40.2888 in0.2835 in
Nov 24, 2014UT Grid + RT40.2951 in0.2752 in
Apr 28, 2012UT Grid (API 572)40.2969 in0.2887 in
Dec 8, 2009UT Grid + RT40.2996 in0.2821 in
Nov 21, 2006UT Spot40.3000 in0.2965 in
Dec 22, 2004UT Spot40.3066 in0.2873 in
Feb 15, 2003UT Grid (API 572)40.3082 in0.2977 in
Jun 3, 2000UT Grid (API 572)40.3109 in0.2969 in
Sep 22, 1997UT Spot40.3085 in0.2959 in
Nov 24, 1994UT Spot40.3147 in0.3146 in
Dec 21, 1991UT Spot40.3158 in0.3129 in
May 4, 1989UT Grid + RT40.3182 in0.3070 in
Jun 23, 1986UT Spot40.3252 in0.3224 in