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V-1181 — Sour Water Column V-1181

Catalytic Reformer · Sour Water service · Installed Aug 24, 2019 (7 yrs in service)

Critical
Current Min. Thickness
0.183 in
t-min 0.166 in
Measured Corrosion Rate
12.39 mpy
ML-predicted: 10.47 mpy
Remaining Life
1.3 yrs
Next Inspection Due
Apr 23, 2027
Interval: 0.7 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 Efficiency1.00
Design Pressure59 psig
Design Temperature343 °F
Operating Pressure46 psig
Operating Temperature322 °F
Diameter94 in
Nominal Thickness0.280 in
Corrosion Allowance0.0938 in
H2S / Chloride366 / 98 ppm
Flow Velocity15.7 ft/s
Process pH6.02
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
8.85 mpy
Predicted corrosion rate under these conditions (-3.54 mpy vs. current measured rate)
Implied Remaining Life
1.9 yrs
Implied Reinspection Interval
0.9 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 — General Corrosion

API 571 §4.2.1

Uniform thinning across the surface due to the process environment. Rate depends on fluid chemistry, temperature, and velocity.

Recommended inspection approach: UT thickness grid at fixed CMLs per API 510/572; trend over time to establish long-term rate.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Spot80.1920 in0.1830 in
May 21, 2024UT Spot80.2227 in0.2055 in
Dec 12, 2021UT Grid + RT80.2494 in0.2314 in