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V-1006 — Two-Phase Hydrocarbon Column V-1006

Fluid Catalytic Cracker · Two-Phase Hydrocarbon service · Installed Aug 27, 2004 (22 yrs in service)

High
Current Min. Thickness
0.254 in
t-min 0.518 in
Measured Corrosion Rate
16.70 mpy
ML-predicted: 9.75 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. 1
Joint Efficiency0.85
Design Pressure121 psig
Design Temperature305 °F
Operating Pressure89 psig
Operating Temperature255 °F
Diameter121 in
Nominal Thickness0.612 in
Corrosion Allowance0.0625 in
H2S / Chloride2 / 228 ppm
Flow Velocity21.7 ft/s
Process pH4.61
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
11.44 mpy
Predicted corrosion rate under these conditions (-5.26 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)60.2592 in0.2543 in
Oct 11, 2024UT Spot60.2697 in0.2618 in
May 7, 2023UT Spot60.2892 in0.2775 in
May 19, 2020UT Spot60.3405 in0.3303 in
Nov 29, 2018UT Grid + RT60.3657 in0.3586 in
Dec 12, 2015UT Spot60.4185 in0.4005 in
Jul 2, 2014UT Spot60.4388 in0.4360 in
Oct 10, 2011UT Grid (API 572)60.4938 in0.4915 in
Jan 9, 2009UT Spot60.5392 in0.5238 in
Apr 14, 2006UT Spot60.5823 in0.5689 in