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V-1355 — Catalyst Slurry Vessel V-1355

Fluid Catalytic Cracker · Catalyst Slurry service · Installed Sep 1, 1985 (41 yrs in service)

High
Current Min. Thickness
0.780 in
t-min 1.276 in
Measured Corrosion Rate
16.66 mpy
ML-predicted: 10.43 mpy
Remaining Life
0.0 yrs
Next Inspection Due
Feb 20, 2027
Interval: 0.5 yrs (API 510)

UT Thickness Trend

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

Vessel Specification

MaterialSA-240-304L Stainless
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency1.00
Design Pressure369 psig
Design Temperature564 °F
Operating Pressure303 psig
Operating Temperature530 °F
Diameter114 in
Nominal Thickness1.474 in
Corrosion Allowance0.1250 in
H2S / Chloride25 / 36 ppm
Flow Velocity6.1 ft/s
Process pH7.89
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
9.34 mpy
Predicted corrosion rate under these conditions (-7.32 mpy vs. current measured rate)
Implied Remaining Life
0.0 yrs
Implied Reinspection Interval
0.5 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 Grid + RT80.7921 in0.7798 in
Feb 25, 2025UT Grid + RT80.8156 in0.7995 in
Sep 26, 2022UT Spot80.8550 in0.8351 in
Aug 7, 2019UT Grid (API 572)80.9085 in0.9076 in
May 20, 2016UT Grid + RT80.9647 in0.9497 in
Oct 7, 2013UT Spot81.0098 in0.9961 in
Mar 23, 2011UT Spot81.0494 in1.0443 in
Mar 3, 2009UT Grid (API 572)81.0825 in1.0761 in
Feb 12, 2007UT Grid (API 572)81.1156 in1.0997 in
Jun 29, 2004UT Grid (API 572)81.1623 in1.1432 in
Dec 29, 2001UT Grid (API 572)81.2018 in1.1912 in
Aug 13, 2000UT Grid (API 572)81.2246 in1.2145 in
Sep 28, 1998UT Grid (API 572)81.2582 in1.2554 in
Dec 25, 1995UT Grid (API 572)81.3036 in1.2969 in
Aug 7, 1994UT Grid + RT81.3271 in1.3164 in
Sep 23, 1992UT Grid (API 572)81.3575 in1.3459 in
May 27, 1990UT Spot81.3944 in1.3793 in
Feb 1, 1988UT Spot81.4347 in1.4159 in