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V-1353 — Atmospheric Gas Oil Vessel V-1353

Crude Distillation Unit · Atmospheric Gas Oil service · Installed Sep 1, 1986 (40 yrs in service)

Low-Medium
Current Min. Thickness
1.713 in
t-min 1.640 in
Measured Corrosion Rate
1.51 mpy
ML-predicted: 2.38 mpy
Remaining Life
48.4 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 Pressure405 psig
Design Temperature667 °F
Operating Pressure360 psig
Operating Temperature483 °F
Diameter115 in
Nominal Thickness1.793 in
Corrosion Allowance0.1250 in
H2S / Chloride2 / 16 ppm
Flow Velocity10.4 ft/s
Process pH5.40
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
8.62 mpy
Predicted corrosion rate under these conditions (+7.11 mpy vs. current measured rate)
Implied Remaining Life
8.5 yrs
Implied Reinspection Interval
4.2 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 + RT61.7298 in1.7128 in
Jan 8, 2024UT Spot61.7366 in1.7257 in
Sep 6, 2021UT Spot61.7412 in1.7240 in
Nov 29, 2019UT Spot61.7429 in1.7270 in
Oct 28, 2016UT Grid + RT61.7492 in1.7309 in
May 19, 2014UT Grid + RT61.7492 in1.7358 in
Oct 12, 2011UT Grid + RT61.7552 in1.7462 in
Jan 16, 2009UT Spot61.7593 in1.7528 in
Feb 11, 2007UT Grid (API 572)61.7636 in1.7603 in
Aug 26, 2004UT Grid (API 572)61.7649 in1.7600 in
Dec 2, 2002UT Spot61.7705 in1.7553 in
Mar 27, 2001UT Grid + RT61.7719 in1.7608 in
Jan 27, 1998UT Spot61.7728 in1.7726 in
May 28, 1995UT Grid (API 572)61.7796 in1.7641 in
Aug 29, 1992UT Spot61.7820 in1.7736 in
Jan 4, 1991UT Grid + RT61.7884 in1.7880 in
May 2, 1989UT Spot61.7880 in1.7781 in