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V-1028 — Crude Oil Drum V-1028

Amine Treating Unit · Crude Oil service · Installed Aug 30, 1994 (32 yrs in service)

Medium
Current Min. Thickness
0.274 in
t-min 0.200 in
Measured Corrosion Rate
2.17 mpy
ML-predicted: 1.21 mpy
Remaining Life
34.5 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. 1
Joint Efficiency0.85
Design Pressure151 psig
Design Temperature690 °F
Operating Pressure98 psig
Operating Temperature562 °F
Diameter37 in
Nominal Thickness0.347 in
Corrosion Allowance0.0938 in
H2S / Chloride23 / 240 ppm
Flow Velocity14.0 ft/s
Process pH8.01
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
7.93 mpy
Predicted corrosion rate under these conditions (+5.76 mpy vs. current measured rate)
Implied Remaining Life
9.5 yrs
Implied Reinspection Interval
4.7 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 Spot40.2769 in0.2744 in
Oct 18, 2024UT Grid (API 572)40.2782 in0.2760 in
Sep 1, 2022UT Grid + RT40.2861 in0.2678 in
Aug 28, 2020UT Grid + RT40.2888 in0.2816 in
Sep 11, 2017UT Grid + RT40.2942 in0.2805 in
Mar 6, 2015UT Grid + RT40.3005 in0.2973 in
Jul 23, 2013UT Grid (API 572)40.3070 in0.3016 in
Nov 1, 2010UT Spot40.3131 in0.3082 in
Apr 20, 2009UT Grid + RT40.3148 in0.3125 in
Jan 13, 2007UT Grid + RT40.3208 in0.3148 in
Mar 9, 2004UT Spot40.3257 in0.3064 in
Jan 23, 2002UT Grid (API 572)40.3271 in0.3079 in
Feb 15, 1999UT Spot40.3328 in0.3275 in
Aug 28, 1997UT Grid + RT40.3397 in0.3383 in