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V-1176 — Sour Water Column V-1176

Hydrocracker · Sour Water service · Installed Aug 28, 2001 (25 yrs in service)

Medium
Current Min. Thickness
0.385 in
t-min 0.302 in
Measured Corrosion Rate
1.19 mpy
ML-predicted: 1.93 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 Pressure85 psig
Design Temperature746 °F
Operating Pressure74 psig
Operating Temperature586 °F
Diameter107 in
Nominal Thickness0.424 in
Corrosion Allowance0.0625 in
H2S / Chloride368 / 201 ppm
Flow Velocity12.7 ft/s
Process pH8.48
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
2.75 mpy
Predicted corrosion rate under these conditions (+1.56 mpy vs. current measured rate)
Implied Remaining Life
30.3 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 — CO2 (Sweet) Corrosion

API 571 §4.2.2

Carbonic-acid corrosion from dissolved CO2 in aqueous phases; rate peaks around 100–160°F and increases with velocity.

Recommended inspection approach: UT thickness grid focused on low points and water dropout locations; monitor produced-water chemistry.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Spot40.3974 in0.3851 in
May 6, 2026UT Grid + RT40.3923 in0.3756 in
Jun 5, 2024UT Grid + RT40.3966 in0.3948 in
Jun 24, 2022UT Spot40.3998 in0.3850 in
Nov 13, 2019UT Grid + RT40.4041 in0.4000 in
May 1, 2018UT Grid + RT40.4017 in0.3946 in
Jul 14, 2015UT Grid (API 572)40.4069 in0.4005 in
May 29, 2012UT Grid (API 572)40.4130 in0.4097 in
Nov 16, 2009UT Grid (API 572)40.4159 in0.3961 in
Jun 23, 2008UT Grid + RT40.4192 in0.4171 in
Jan 13, 2007UT Grid + RT40.4165 in0.4107 in
Mar 31, 2004UT Grid (API 572)40.4199 in0.4125 in