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V-1210 — Atmospheric Gas Oil Drum V-1210

Hydrocracker · Atmospheric Gas Oil service · Installed Aug 25, 2014 (12 yrs in service)

High
Current Min. Thickness
0.755 in
t-min 0.968 in
Measured Corrosion Rate
28.80 mpy
ML-predicted: 24.09 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 Pressure371 psig
Design Temperature618 °F
Operating Pressure243 psig
Operating Temperature487 °F
Diameter86 in
Nominal Thickness1.107 in
Corrosion Allowance0.0625 in
H2S / Chloride6 / 95 ppm
Flow Velocity20.1 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
17.64 mpy
Predicted corrosion rate under these conditions (-11.16 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 (API 572)80.7625 in0.7554 in
Nov 20, 2024UT Grid + RT80.8115 in0.8108 in
Mar 9, 2023UT Grid (API 572)80.8612 in0.8434 in
Jul 31, 2020UT Spot80.9382 in0.9319 in
Nov 19, 2018UT Grid + RT80.9871 in0.9744 in
Aug 25, 2016UT Spot81.0495 in1.0299 in