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V-1337 — Crude Oil Drum V-1337

Catalytic Reformer · Crude Oil service · Installed Aug 25, 2013 (13 yrs in service)

Critical
Current Min. Thickness
0.852 in
t-min 0.856 in
Measured Corrosion Rate
11.89 mpy
ML-predicted: 16.10 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 Efficiency1.00
Design Pressure608 psig
Design Temperature116 °F
Operating Pressure340 psig
Operating Temperature107 °F
Diameter46 in
Nominal Thickness1.010 in
Corrosion Allowance0.1250 in
H2S / Chloride47 / 35 ppm
Flow Velocity4.0 ft/s
Process pH8.27
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
14.08 mpy
Predicted corrosion rate under these conditions (+2.19 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 Spot40.8537 in0.8523 in
May 15, 2026UT Spot40.8599 in0.8546 in
May 31, 2023UT Grid + RT40.8925 in0.8748 in
Sep 29, 2021UT Spot40.9170 in0.9066 in
Jun 17, 2018UT Grid + RT40.9542 in0.9357 in
Apr 8, 2015UT Grid + RT40.9895 in0.9755 in