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V-1145 — Atmospheric Gas Oil Drum V-1145

Sulfur Recovery Unit · Atmospheric Gas Oil service · Installed Aug 28, 2001 (25 yrs in service)

High
Current Min. Thickness
0.137 in
t-min 0.283 in
Measured Corrosion Rate
11.30 mpy
ML-predicted: 17.31 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-240-316L Stainless
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency0.85
Design Pressure127 psig
Design Temperature375 °F
Operating Pressure71 psig
Operating Temperature319 °F
Diameter63 in
Nominal Thickness0.418 in
Corrosion Allowance0.0938 in
H2S / Chloride27 / 220 ppm
Flow Velocity4.5 ft/s
Process pH7.45
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
14.41 mpy
Predicted corrosion rate under these conditions (+3.11 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 + RT80.1417 in0.1374 in
Apr 28, 2026UT Spot80.1417 in0.1392 in
Aug 3, 2023UT Grid + RT80.1417 in0.1354 in
Dec 25, 2021UT Spot80.1417 in0.1339 in
Sep 12, 2019UT Grid + RT80.1417 in0.1288 in
Jun 20, 2017UT Grid + RT80.1417 in0.1379 in
Mar 6, 2015UT Spot80.1627 in0.1442 in
Jul 28, 2012UT Spot80.2119 in0.1990 in
Jul 26, 2009UT Grid + RT80.2682 in0.2485 in
Dec 10, 2007UT Grid (API 572)80.2980 in0.2959 in
Feb 17, 2005UT Grid + RT80.3553 in0.3551 in
Feb 3, 2003UT Grid (API 572)80.3899 in0.3865 in