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V-1183 — Catalyst Slurry Vessel V-1183

Delayed Coker · Catalyst Slurry service · Installed Aug 26, 2009 (17 yrs in service)

Low-Medium
Current Min. Thickness
0.406 in
t-min 0.228 in
Measured Corrosion Rate
0.50 mpy
ML-predicted: 0.76 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 Pressure66 psig
Design Temperature249 °F
Operating Pressure49 psig
Operating Temperature150 °F
Diameter117 in
Nominal Thickness0.422 in
Corrosion Allowance0.1250 in
H2S / Chloride4 / 202 ppm
Flow Velocity11.3 ft/s
Process pH4.22
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
1.27 mpy
Predicted corrosion rate under these conditions (+0.77 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 Grid (API 572)40.4151 in0.4059 in
Sep 2, 2025UT Grid + RT40.4112 in0.3928 in
Mar 3, 2024UT Grid + RT40.4164 in0.4087 in
Aug 3, 2021UT Grid + RT40.4148 in0.4142 in
Jan 31, 2020UT Spot40.4165 in0.4044 in
Jul 10, 2017UT Grid (API 572)40.4206 in0.4090 in
Dec 31, 2014UT Grid + RT40.4233 in0.4133 in
Jun 10, 2013UT Grid (API 572)40.4172 in0.3982 in
Jul 23, 2011UT Grid + RT40.4187 in0.4144 in