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V-1103 — Boiler Feed Water Vessel V-1103

Sulfur Recovery Unit · Boiler Feed Water service · Installed Aug 24, 2019 (7 yrs in service)

Low
Current Min. Thickness
0.647 in
t-min 0.473 in
Measured Corrosion Rate
0.50 mpy
ML-predicted: -0.07 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. 2
Joint Efficiency1.00
Design Pressure176 psig
Design Temperature371 °F
Operating Pressure133 psig
Operating Temperature248 °F
Diameter107 in
Nominal Thickness0.658 in
Corrosion Allowance0.1250 in
H2S / Chloride9 / 93 ppm
Flow Velocity1.5 ft/s
Process pH5.20
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
0.10 mpy
Predicted corrosion rate under these conditions (-0.40 mpy vs. current measured rate)
Implied Remaining Life
60+ 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 + RT60.6583 in0.6474 in
May 15, 2025UT Spot60.6556 in0.6419 in
Jun 17, 2022UT Grid (API 572)60.6567 in0.6426 in