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V-1271 — Crude Oil Drum V-1271

Delayed Coker · Crude Oil service · Installed Aug 29, 1997 (29 yrs in service)

Medium
Current Min. Thickness
0.770 in
t-min 0.618 in
Measured Corrosion Rate
1.22 mpy
ML-predicted: 2.23 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 Efficiency0.85
Design Pressure529 psig
Design Temperature401 °F
Operating Pressure356 psig
Operating Temperature251 °F
Diameter39 in
Nominal Thickness0.812 in
Corrosion Allowance0.1250 in
H2S / Chloride39 / 39 ppm
Flow Velocity13.1 ft/s
Process pH7.93
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
7.65 mpy
Predicted corrosion rate under these conditions (+6.43 mpy vs. current measured rate)
Implied Remaining Life
19.9 yrs
Implied Reinspection Interval
9.9 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 + RT40.7750 in0.7705 in
Jun 12, 2025UT Grid + RT40.7788 in0.7687 in
Mar 10, 2022UT Grid + RT40.7812 in0.7790 in
Apr 22, 2019UT Grid + RT40.7829 in0.7646 in
Aug 14, 2017UT Grid (API 572)40.7884 in0.7831 in
May 16, 2015UT Grid + RT40.7921 in0.7797 in
Sep 24, 2013UT Grid (API 572)40.7937 in0.7936 in
Mar 26, 2012UT Spot40.7962 in0.7907 in
Mar 26, 2010UT Grid (API 572)40.7986 in0.7936 in
Apr 17, 2008UT Grid + RT40.7994 in0.7801 in
Nov 3, 2005UT Grid (API 572)40.8010 in0.7875 in
May 29, 2003UT Spot40.8054 in0.7982 in
Dec 2, 2000UT Grid + RT40.8054 in0.7928 in