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V-1235 — Steam Condensate Vessel V-1235

Amine Treating Unit · Steam Condensate service · Installed Aug 24, 2016 (10 yrs in service)

Low
Current Min. Thickness
2.074 in
t-min 1.921 in
Measured Corrosion Rate
4.51 mpy
ML-predicted: 4.96 mpy
Remaining Life
34.0 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. 2
Joint Efficiency0.85
Design Pressure464 psig
Design Temperature322 °F
Operating Pressure279 psig
Operating Temperature286 °F
Diameter123 in
Nominal Thickness2.123 in
Corrosion Allowance0.1250 in
H2S / Chloride26 / 206 ppm
Flow Velocity12.5 ft/s
Process pH5.19
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
6.21 mpy
Predicted corrosion rate under these conditions (+1.70 mpy vs. current measured rate)
Implied Remaining Life
24.6 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 Spot62.0769 in2.0744 in
Mar 9, 2026UT Grid + RT62.0821 in2.0794 in
Feb 12, 2024UT Spot62.0898 in2.0892 in
Feb 23, 2022UT Grid + RT62.0979 in2.0840 in
Mar 23, 2019UT Spot62.1127 in2.1024 in