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V-1106 — Crude Oil Drum V-1106

Fluid Catalytic Cracker · Crude Oil service · Installed Aug 30, 1994 (32 yrs in service)

Critical
Current Min. Thickness
0.665 in
t-min 1.061 in
Measured Corrosion Rate
17.46 mpy
ML-predicted: 16.55 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. 2
Joint Efficiency1.00
Design Pressure447 psig
Design Temperature190 °F
Operating Pressure362 psig
Operating Temperature147 °F
Diameter78 in
Nominal Thickness1.237 in
Corrosion Allowance0.1250 in
H2S / Chloride4 / 283 ppm
Flow Velocity17.8 ft/s
Process pH7.59
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
13.47 mpy
Predicted corrosion rate under these conditions (-3.99 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 Spot40.6759 in0.6652 in
Jul 7, 2026UT Spot40.6828 in0.6770 in
Mar 10, 2024UT Grid + RT40.7183 in0.6989 in
Apr 14, 2021UT Grid (API 572)40.7722 in0.7622 in
Nov 20, 2019UT Grid (API 572)40.7988 in0.7795 in
Jun 7, 2018UT Spot40.8217 in0.8154 in
Mar 18, 2015UT Grid (API 572)40.8776 in0.8726 in
Oct 30, 2013UT Spot40.9037 in0.8886 in
Oct 2, 2011UT Spot40.9380 in0.9248 in
Nov 10, 2009UT Grid + RT40.9697 in0.9684 in
Nov 24, 2007UT Grid (API 572)41.0052 in0.9856 in
Jun 5, 2006UT Spot41.0315 in1.0268 in
Nov 21, 2004UT Grid + RT41.0577 in1.0508 in
Dec 22, 2002UT Spot41.0919 in1.0843 in
Jan 23, 2001UT Grid (API 572)41.1231 in1.1141 in
Apr 10, 1999UT Grid (API 572)41.1561 in1.1364 in
Apr 30, 1996UT Grid (API 572)41.2091 in1.1927 in