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V-1111 — Catalyst Slurry Drum V-1111

Catalytic Reformer · Catalyst Slurry service · Installed Sep 1, 1984 (42 yrs in service)

Low-Medium
Current Min. Thickness
0.406 in
t-min 0.298 in
Measured Corrosion Rate
0.97 mpy
ML-predicted: 1.83 mpy
Remaining Life
60+ 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. 1
Joint Efficiency0.85
Design Pressure264 psig
Design Temperature448 °F
Operating Pressure159 psig
Operating Temperature385 °F
Diameter38 in
Nominal Thickness0.464 in
Corrosion Allowance0.1250 in
H2S / Chloride19 / 264 ppm
Flow Velocity3.3 ft/s
Process pH6.01
InsulatedYes

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
0.52 mpy
Predicted corrosion rate under these conditions (-0.45 mpy vs. current measured rate)
Implied Remaining Life
60+ yrs
Implied Reinspection Interval
10.0 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 Spot40.4224 in0.4065 in
Mar 25, 2024UT Spot40.4265 in0.4189 in
Jun 28, 2022UT Grid + RT40.4280 in0.4094 in
Apr 12, 2019UT Grid (API 572)40.4305 in0.4210 in
Jun 8, 2017UT Spot40.4318 in0.4129 in
Sep 6, 2014UT Grid (API 572)40.4368 in0.4192 in
May 29, 2012UT Grid + RT40.4385 in0.4228 in
Apr 1, 2009UT Spot40.4390 in0.4333 in
Apr 30, 2006UT Grid (API 572)40.4398 in0.4201 in
Nov 28, 2003UT Grid + RT40.4435 in0.4376 in
Oct 8, 2000UT Grid (API 572)40.4499 in0.4446 in
Oct 20, 1997UT Spot40.4527 in0.4336 in
Aug 28, 1995UT Spot40.4537 in0.4404 in
Mar 21, 1994UT Grid (API 572)40.4526 in0.4332 in
Aug 27, 1992UT Spot40.4581 in0.4383 in
Dec 16, 1990UT Grid + RT40.4604 in0.4407 in
Oct 1, 1988UT Grid (API 572)40.4594 in0.4584 in
Apr 16, 1986UT Spot40.4611 in0.4531 in