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V-1013 — Catalyst Slurry Column V-1013

Delayed Coker · Catalyst Slurry service · Installed Aug 29, 1996 (30 yrs in service)

High
Current Min. Thickness
1.632 in
t-min 2.081 in
Measured Corrosion Rate
19.97 mpy
ML-predicted: 9.44 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-240-316L Stainless
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency1.00
Design Pressure513 psig
Design Temperature623 °F
Operating Pressure387 psig
Operating Temperature471 °F
Diameter133 in
Nominal Thickness2.236 in
Corrosion Allowance0.0938 in
H2S / Chloride3 / 118 ppm
Flow Velocity11.4 ft/s
Process pH4.21
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
12.77 mpy
Predicted corrosion rate under these conditions (-7.20 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 (API 572)41.6336 in1.6323 in
Jan 8, 2025UT Grid (API 572)41.6700 in1.6560 in
Dec 26, 2022UT Spot41.7074 in1.6936 in
Dec 9, 2020UT Grid (API 572)41.7517 in1.7341 in
Jan 10, 2019UT Grid + RT41.7863 in1.7664 in
Jun 9, 2016UT Grid + RT41.8385 in1.8306 in
Mar 13, 2013UT Grid (API 572)41.9060 in1.8888 in
Sep 28, 2010UT Grid (API 572)41.9550 in1.9357 in
Jan 13, 2009UT Grid + RT41.9889 in1.9764 in
Dec 3, 2006UT Spot42.0291 in2.0111 in
Feb 14, 2005UT Spot42.0679 in2.0650 in
Jun 30, 2003UT Grid (API 572)42.0985 in2.0861 in
Apr 30, 2001UT Grid (API 572)42.1386 in2.1357 in
Nov 19, 1998UT Grid (API 572)42.1891 in2.1792 in