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V-1315 — Crude Oil Drum V-1315

Sulfur Recovery Unit · Crude Oil service · Installed Aug 31, 1988 (38 yrs in service)

Critical
Current Min. Thickness
1.092 in
t-min 1.242 in
Measured Corrosion Rate
8.38 mpy
ML-predicted: 13.83 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-240-304L Stainless
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency0.85
Design Pressure455 psig
Design Temperature103 °F
Operating Pressure338 psig
Operating Temperature81 °F
Diameter76 in
Nominal Thickness1.414 in
Corrosion Allowance0.1250 in
H2S / Chloride7 / 208 ppm
Flow Velocity2.0 ft/s
Process pH7.35
InsulatedYes

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
10.78 mpy
Predicted corrosion rate under these conditions (+2.40 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 Spot41.0987 in1.0917 in
Jun 7, 2026UT Grid (API 572)41.1003 in1.0824 in
May 25, 2024UT Grid + RT41.1186 in1.1074 in
Sep 14, 2022UT Grid (API 572)41.1287 in1.1259 in
Jan 24, 2021UT Grid (API 572)41.1437 in1.1258 in
Jan 5, 2019UT Grid (API 572)41.1622 in1.1490 in
Sep 28, 2016UT Grid (API 572)41.1809 in1.1769 in
Jan 21, 2015UT Grid (API 572)41.1922 in1.1858 in
Aug 4, 2013UT Spot41.2072 in1.1948 in
Nov 29, 2010UT Spot41.2307 in1.2190 in
Mar 23, 2009UT Spot41.2420 in1.2404 in
Aug 10, 2006UT Spot41.2695 in1.2683 in
Oct 13, 2003UT Spot41.2887 in1.2848 in
Mar 3, 2001UT Grid + RT41.3106 in1.3077 in
Feb 23, 1998UT Spot41.3375 in1.3296 in
Feb 11, 1996UT Grid + RT41.3553 in1.3551 in
Feb 22, 1994UT Grid (API 572)41.3700 in1.3507 in
Jul 20, 1991UT Spot41.3935 in1.3792 in