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V-1109 — Sour Water Drum V-1109

Amine Treating Unit · Sour Water service · Installed Aug 28, 2003 (23 yrs in service)

Medium
Current Min. Thickness
1.445 in
t-min 1.364 in
Measured Corrosion Rate
0.50 mpy
ML-predicted: 2.85 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-516-70 Carbon Steel
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency0.85
Design Pressure575 psig
Design Temperature337 °F
Operating Pressure394 psig
Operating Temperature244 °F
Diameter79 in
Nominal Thickness1.472 in
Corrosion Allowance0.0625 in
H2S / Chloride1090 / 76 ppm
Flow Velocity21.4 ft/s
Process pH5.83
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
3.87 mpy
Predicted corrosion rate under these conditions (+3.37 mpy vs. current measured rate)
Implied Remaining Life
21.0 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 + RT81.4574 in1.4449 in
Oct 16, 2024UT Grid + RT81.4626 in1.4512 in
Apr 20, 2022UT Grid + RT81.4622 in1.4568 in
Mar 11, 2020UT Grid (API 572)81.4604 in1.4548 in
May 4, 2017UT Spot81.4600 in1.4488 in
May 6, 2014UT Grid + RT81.4629 in1.4545 in
Jan 30, 2011UT Spot81.4694 in1.4668 in
Sep 5, 2008UT Spot81.4633 in1.4590 in
Apr 18, 2006UT Grid (API 572)81.4697 in1.4665 in