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V-1273 — Catalyst Slurry Drum V-1273

Amine Treating Unit · Catalyst Slurry service · Installed Aug 26, 2010 (16 yrs in service)

Low-Medium
Current Min. Thickness
0.521 in
t-min 0.394 in
Measured Corrosion Rate
3.48 mpy
ML-predicted: 6.28 mpy
Remaining Life
36.5 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency0.85
Design Pressure241 psig
Design Temperature271 °F
Operating Pressure188 psig
Operating Temperature168 °F
Diameter49 in
Nominal Thickness0.592 in
Corrosion Allowance0.1250 in
H2S / Chloride23 / 224 ppm
Flow Velocity5.0 ft/s
Process pH6.30
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
6.73 mpy
Predicted corrosion rate under these conditions (+3.25 mpy vs. current measured rate)
Implied Remaining Life
18.9 yrs
Implied Reinspection Interval
9.5 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 — 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 Spot80.5390 in0.5213 in
Jan 30, 2025UT Grid + RT80.5424 in0.5268 in
Sep 6, 2022UT Grid + RT80.5492 in0.5411 in
Sep 27, 2020UT Spot80.5548 in0.5357 in
Oct 11, 2017UT Grid (API 572)80.5671 in0.5626 in
Nov 20, 2014UT Spot80.5813 in0.5680 in
Jul 10, 2012UT Grid (API 572)80.5858 in0.5849 in