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V-1061 — Sour Water Vessel V-1061

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

Critical
Current Min. Thickness
0.477 in
t-min 0.520 in
Measured Corrosion Rate
9.69 mpy
ML-predicted: 6.98 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency0.85
Design Pressure149 psig
Design Temperature660 °F
Operating Pressure95 psig
Operating Temperature444 °F
Diameter105 in
Nominal Thickness0.643 in
Corrosion Allowance0.0625 in
H2S / Chloride268 / 264 ppm
Flow Velocity21.4 ft/s
Process pH5.74
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
6.53 mpy
Predicted corrosion rate under these conditions (-3.16 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 — 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)40.4854 in0.4768 in
Jun 12, 2025UT Grid + RT40.4992 in0.4829 in
Nov 15, 2022UT Grid + RT40.5231 in0.5116 in
Sep 12, 2020UT Grid (API 572)40.5421 in0.5347 in
Oct 20, 2017UT Grid + RT40.5724 in0.5700 in
Dec 26, 2014UT Spot40.5963 in0.5879 in
Jul 27, 2013UT Spot40.6126 in0.6024 in