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V-1113 — Catalyst Slurry Drum V-1113

Crude Distillation Unit · Catalyst Slurry service · Installed Aug 24, 2016 (10 yrs in service)

Low-Medium
Current Min. Thickness
0.549 in
t-min 0.442 in
Measured Corrosion Rate
1.91 mpy
ML-predicted: 3.04 mpy
Remaining Life
56.3 yrs
Next Inspection Due
Aug 19, 2036
Interval: 10.0 yrs (API 510)

UT Thickness Trend

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

Vessel Specification

MaterialSA-516-70 Carbon Steel
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency1.00
Design Pressure345 psig
Design Temperature668 °F
Operating Pressure306 psig
Operating Temperature623 °F
Diameter43 in
Nominal Thickness0.575 in
Corrosion Allowance0.0625 in
H2S / Chloride24 / 217 ppm
Flow Velocity13.6 ft/s
Process pH5.98
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
5.82 mpy
Predicted corrosion rate under these conditions (+3.91 mpy vs. current measured rate)
Implied Remaining Life
18.4 yrs
Implied Reinspection Interval
9.2 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 — Erosion-Corrosion

API 571 §4.2.13

Mechanical removal of protective scale by high-velocity flow or entrained solids, accelerating the underlying corrosion mechanism.

Recommended inspection approach: UT thickness at flow-direction changes (elbows, reducers); review process velocity against API RP 14E erosional velocity limits.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid (API 572)60.5573 in0.5495 in
Apr 15, 2024UT Grid + RT60.5591 in0.5453 in
Jan 20, 2021UT Grid (API 572)60.5676 in0.5557 in
Jun 13, 2019UT Spot60.5677 in0.5667 in
Jan 9, 2018UT Spot60.5745 in0.5708 in