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V-1149 — Sour Water Vessel V-1149

Catalytic Reformer · Sour Water service · Installed Aug 23, 2020 (6 yrs in service)

Medium
Current Min. Thickness
2.117 in
t-min 1.973 in
Measured Corrosion Rate
0.99 mpy
ML-predicted: 2.36 mpy
Remaining Life
60+ yrs
Next Inspection Due
Aug 19, 2036
Interval: 10.0 yrs (API 510)

UT Thickness Trend

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

Vessel Specification

MaterialSA-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency0.85
Design Pressure607 psig
Design Temperature125 °F
Operating Pressure484 psig
Operating Temperature81 °F
Diameter96 in
Nominal Thickness2.140 in
Corrosion Allowance0.0938 in
H2S / Chloride57 / 215 ppm
Flow Velocity4.3 ft/s
Process pH6.28
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
5.75 mpy
Predicted corrosion rate under these conditions (+4.76 mpy vs. current measured rate)
Implied Remaining Life
25.0 yrs
Implied Reinspection Interval
10.0 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 Grid (API 572)82.1304 in2.1171 in
Mar 25, 2026UT Grid + RT82.1381 in2.1358 in
May 24, 2023UT Grid + RT82.1355 in2.1160 in