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V-1220 — Steam Condensate Column V-1220

Sulfur Recovery Unit · Steam Condensate service · Installed Aug 24, 2019 (7 yrs in service)

Low-Medium
Current Min. Thickness
0.297 in
t-min 0.228 in
Measured Corrosion Rate
13.39 mpy
ML-predicted: 12.03 mpy
Remaining Life
5.1 yrs
Next Inspection Due
Mar 17, 2029
Interval: 2.6 yrs (API 510)

UT Thickness Trend

Minimum CML reading per inspection vs. ASME Sec. VIII t-min

Vessel Specification

MaterialSA-240-316L Stainless
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency0.85
Design Pressure53 psig
Design Temperature646 °F
Operating Pressure41 psig
Operating Temperature536 °F
Diameter122 in
Nominal Thickness0.401 in
Corrosion Allowance0.0938 in
H2S / Chloride38 / 54 ppm
Flow Velocity3.8 ft/s
Process pH5.44
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
10.06 mpy
Predicted corrosion rate under these conditions (-3.33 mpy vs. current measured rate)
Implied Remaining Life
6.8 yrs
Implied Reinspection Interval
3.4 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 Spot40.3059 in0.2971 in
May 27, 2025UT Spot40.3273 in0.3168 in
Oct 5, 2022UT Spot40.3616 in0.3420 in