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V-1045 — Sour Water Vessel V-1045

Hydrocracker · Sour Water service · Installed Aug 26, 2010 (16 yrs in service)

Medium
Current Min. Thickness
0.644 in
t-min 0.555 in
Measured Corrosion Rate
3.43 mpy
ML-predicted: 4.36 mpy
Remaining Life
26.2 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-240-304L Stainless
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency1.00
Design Pressure144 psig
Design Temperature262 °F
Operating Pressure101 psig
Operating Temperature219 °F
Diameter128 in
Nominal Thickness0.720 in
Corrosion Allowance0.1250 in
H2S / Chloride956 / 31 ppm
Flow Velocity9.0 ft/s
Process pH5.12
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
5.64 mpy
Predicted corrosion rate under these conditions (+2.21 mpy vs. current measured rate)
Implied Remaining Life
15.9 yrs
Implied Reinspection Interval
8.0 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 Spot60.6627 in0.6445 in
Jun 28, 2025UT Grid + RT60.6699 in0.6641 in
Apr 17, 2022UT Spot60.6840 in0.6762 in
Jan 23, 2020UT Grid + RT60.6908 in0.6815 in
Sep 9, 2017UT Grid (API 572)60.6957 in0.6793 in
Mar 29, 2016UT Grid + RT60.7023 in0.6907 in
Oct 25, 2013UT Spot60.7088 in0.6987 in