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V-1203 — Coker Vapor Drum V-1203

Catalytic Reformer · Coker Vapor service · Installed Aug 24, 2018 (8 yrs in service)

Medium
Current Min. Thickness
0.345 in
t-min 0.286 in
Measured Corrosion Rate
10.12 mpy
ML-predicted: 9.78 mpy
Remaining Life
5.9 yrs
Next Inspection Due
Jul 28, 2029
Interval: 2.9 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. 2
Joint Efficiency0.85
Design Pressure155 psig
Design Temperature411 °F
Operating Pressure121 psig
Operating Temperature269 °F
Diameter52 in
Nominal Thickness0.439 in
Corrosion Allowance0.1250 in
H2S / Chloride38 / 34 ppm
Flow Velocity21.8 ft/s
Process pH7.26
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
9.51 mpy
Predicted corrosion rate under these conditions (-0.61 mpy vs. current measured rate)
Implied Remaining Life
6.2 yrs
Implied Reinspection Interval
3.1 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 Spot80.3569 in0.3452 in
Jun 1, 2025UT Grid + RT80.3714 in0.3547 in
Jun 21, 2023UT Spot80.3912 in0.3891 in
Sep 21, 2021UT Grid + RT80.4068 in0.4000 in