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V-1002 — Vacuum Resid Drum V-1002

Catalytic Reformer · Vacuum Resid service · Installed Aug 26, 2010 (16 yrs in service)

High
Current Min. Thickness
0.484 in
t-min 0.527 in
Measured Corrosion Rate
8.28 mpy
ML-predicted: 7.61 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency1.00
Design Pressure430 psig
Design Temperature581 °F
Operating Pressure287 psig
Operating Temperature370 °F
Diameter43 in
Nominal Thickness0.633 in
Corrosion Allowance0.0625 in
H2S / Chloride39 / 165 ppm
Flow Velocity14.9 ft/s
Process pH8.85
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
7.03 mpy
Predicted corrosion rate under these conditions (-1.25 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 — 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 Spot40.5008 in0.4841 in
Jan 8, 2026UT Grid + RT40.5055 in0.4980 in
Apr 22, 2023UT Grid + RT40.5272 in0.5237 in
Sep 8, 2021UT Grid + RT40.5418 in0.5319 in
Feb 23, 2020UT Grid + RT40.5534 in0.5520 in
Feb 15, 2018UT Grid + RT40.5709 in0.5544 in
Mar 2, 2015UT Spot40.5956 in0.5896 in
Jul 9, 2013UT Grid + RT40.6089 in0.6005 in