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V-1244 — Crude Oil Drum V-1244

Amine Treating Unit · Crude Oil service · Installed Aug 26, 2009 (17 yrs in service)

Medium
Current Min. Thickness
0.134 in
t-min 0.061 in
Measured Corrosion Rate
5.24 mpy
ML-predicted: 6.87 mpy
Remaining Life
13.8 yrs
Next Inspection Due
Jul 6, 2033
Interval: 6.9 yrs (API 510)

UT Thickness Trend

Minimum CML reading per inspection vs. ASME Sec. VIII t-min

Vessel Specification

MaterialSA-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency1.00
Design Pressure56 psig
Design Temperature362 °F
Operating Pressure41 psig
Operating Temperature337 °F
Diameter39 in
Nominal Thickness0.228 in
Corrosion Allowance0.0938 in
H2S / Chloride44 / 135 ppm
Flow Velocity11.8 ft/s
Process pH7.10
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
6.12 mpy
Predicted corrosion rate under these conditions (+0.88 mpy vs. current measured rate)
Implied Remaining Life
11.8 yrs
Implied Reinspection Interval
5.9 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 — High-Temperature Sulfidation

API 571 §4.2.11

Reaction of sulfur compounds with steel at high temperature (>500°F) in the absence of water; rate governed by sulfur content, temperature, alloy content.

Recommended inspection approach: UT thickness per Modified McConomy-curve risk ranking; RT/UT at known high-rate locations identified by process simulation.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Spot80.1373 in0.1335 in
Jun 9, 2025UT Grid (API 572)80.1454 in0.1337 in
Dec 28, 2023UT Grid + RT80.1531 in0.1415 in
Apr 9, 2021UT Grid (API 572)80.1669 in0.1608 in
Mar 17, 2019UT Grid + RT80.1734 in0.1696 in
Dec 3, 2015UT Grid (API 572)80.1950 in0.1840 in
Jun 27, 2014UT Grid + RT80.2024 in0.1934 in
Jun 3, 2011UT Grid + RT80.2170 in0.2012 in