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V-1347 — Boiler Feed Water Drum V-1347

Delayed Coker · Boiler Feed Water service · Installed Aug 26, 2009 (17 yrs in service)

Low
Current Min. Thickness
0.712 in
t-min 0.627 in
Measured Corrosion Rate
0.54 mpy
ML-predicted: 1.08 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 Efficiency1.00
Design Pressure434 psig
Design Temperature383 °F
Operating Pressure341 psig
Operating Temperature337 °F
Diameter57 in
Nominal Thickness0.724 in
Corrosion Allowance0.0625 in
H2S / Chloride3 / 78 ppm
Flow Velocity7.4 ft/s
Process pH6.42
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
0.39 mpy
Predicted corrosion rate under these conditions (-0.15 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 (API 572)40.7152 in0.7123 in
Feb 24, 2024UT Grid + RT40.7193 in0.7078 in
Mar 6, 2021UT Spot40.7173 in0.7113 in
Mar 2, 2019UT Grid + RT40.7192 in0.7002 in
May 24, 2017UT Grid (API 572)40.7211 in0.7070 in
Feb 9, 2014UT Grid + RT40.7229 in0.7088 in
May 12, 2011UT Grid (API 572)40.7256 in0.7206 in