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V-1309 — Sour Water Column V-1309

Hydrocracker · Sour Water service · Installed Aug 29, 1996 (30 yrs in service)

Critical
Current Min. Thickness
1.425 in
t-min 1.530 in
Measured Corrosion Rate
7.83 mpy
ML-predicted: 5.24 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-240-304L Stainless
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency0.85
Design Pressure463 psig
Design Temperature144 °F
Operating Pressure327 psig
Operating Temperature102 °F
Diameter92 in
Nominal Thickness1.676 in
Corrosion Allowance0.0938 in
H2S / Chloride944 / 28 ppm
Flow Velocity11.2 ft/s
Process pH6.69
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
5.69 mpy
Predicted corrosion rate under these conditions (-2.14 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 — 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 Grid (API 572)81.4390 in1.4247 in
Sep 5, 2025UT Grid (API 572)81.4501 in1.4363 in
Dec 3, 2022UT Spot81.4658 in1.4577 in
Oct 9, 2020UT Grid + RT81.4850 in1.4788 in
Aug 22, 2017UT Grid + RT81.5130 in1.4978 in
Nov 28, 2014UT Grid + RT81.5320 in1.5235 in
Feb 26, 2013UT Grid + RT81.5470 in1.5334 in
Jul 19, 2010UT Grid + RT81.5628 in1.5591 in
Jul 24, 2007UT Grid + RT81.5869 in1.5733 in
Nov 2, 2004UT Spot81.6105 in1.5909 in
Apr 8, 2002UT Spot81.6333 in1.6200 in
Dec 23, 1999UT Grid + RT81.6495 in1.6474 in
Jul 22, 1998UT Spot81.6573 in1.6415 in