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66Phillips 66Vessel Integrity Intelligence
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V-1167 — Catalyst Slurry Column V-1167

Crude Distillation Unit · Catalyst Slurry service · Installed Sep 1, 1986 (40 yrs in service)

Low-Medium
Current Min. Thickness
0.496 in
t-min 0.422 in
Measured Corrosion Rate
0.85 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. 2
Joint Efficiency0.85
Design Pressure155 psig
Design Temperature345 °F
Operating Pressure95 psig
Operating Temperature264 °F
Diameter92 in
Nominal Thickness0.548 in
Corrosion Allowance0.0938 in
H2S / Chloride48 / 148 ppm
Flow Velocity17.3 ft/s
Process pH8.24
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
1.05 mpy
Predicted corrosion rate under these conditions (+0.20 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 Spot80.5125 in0.4959 in
Apr 22, 2026UT Grid + RT80.5150 in0.5070 in
May 7, 2024UT Grid (API 572)80.5116 in0.5106 in
Oct 24, 2022UT Spot80.5161 in0.5042 in
Aug 22, 2020UT Grid + RT80.5215 in0.5047 in
Jul 14, 2018UT Grid (API 572)80.5215 in0.5142 in
Apr 1, 2015UT Grid (API 572)80.5235 in0.5220 in
Jun 2, 2012UT Grid + RT80.5256 in0.5200 in
Aug 26, 2009UT Grid + RT80.5310 in0.5186 in
Jun 4, 2007UT Spot80.5273 in0.5155 in
Apr 17, 2005UT Grid + RT80.5322 in0.5184 in
Apr 16, 2003UT Grid (API 572)80.5328 in0.5196 in
Oct 11, 2001UT Spot80.5350 in0.5336 in
Nov 15, 1999UT Grid + RT80.5390 in0.5191 in
Mar 17, 1998UT Grid + RT80.5348 in0.5249 in
Aug 8, 1996UT Spot80.5385 in0.5323 in
Oct 17, 1993UT Spot80.5411 in0.5365 in
Feb 19, 1991UT Grid + RT80.5445 in0.5311 in
Oct 6, 1989UT Grid (API 572)80.5440 in0.5242 in