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V-1093 — Boiler Feed Water Drum V-1093

Catalytic Reformer · Boiler Feed Water service · Installed Aug 26, 2011 (15 yrs in service)

Low
Current Min. Thickness
0.359 in
t-min 0.259 in
Measured Corrosion Rate
0.60 mpy
ML-predicted: 0.15 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 Efficiency0.85
Design Pressure182 psig
Design Temperature461 °F
Operating Pressure145 psig
Operating Temperature298 °F
Diameter48 in
Nominal Thickness0.377 in
Corrosion Allowance0.0938 in
H2S / Chloride13 / 256 ppm
Flow Velocity10.7 ft/s
Process pH8.11
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 (-0.50 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 Spot80.3696 in0.3590 in
May 17, 2024UT Grid (API 572)80.3687 in0.3656 in
Dec 18, 2022UT Grid + RT80.3694 in0.3525 in
Jun 19, 2021UT Spot80.3710 in0.3517 in
Apr 6, 2018UT Grid (API 572)80.3771 in0.3769 in
Apr 12, 2016UT Spot80.3750 in0.3601 in
Apr 23, 2013UT Grid (API 572)80.3757 in0.3617 in