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V-1215 — Boiler Feed Water Vessel V-1215

Crude Distillation Unit · Boiler Feed Water service · Installed Aug 26, 2011 (15 yrs in service)

Low
Current Min. Thickness
0.404 in
t-min 0.247 in
Measured Corrosion Rate
0.62 mpy
ML-predicted: 0.32 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 Pressure85 psig
Design Temperature517 °F
Operating Pressure69 psig
Operating Temperature315 °F
Diameter114 in
Nominal Thickness0.424 in
Corrosion Allowance0.1250 in
H2S / Chloride23 / 53 ppm
Flow Velocity1.2 ft/s
Process pH6.12
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
0.26 mpy
Predicted corrosion rate under these conditions (-0.36 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)80.4166 in0.4042 in
Jul 4, 2025UT Grid (API 572)80.4154 in0.4111 in
Jul 23, 2022UT Grid (API 572)80.4181 in0.4165 in
Sep 10, 2019UT Grid + RT80.4229 in0.4120 in
Feb 23, 2017UT Spot80.4239 in0.4220 in
Dec 29, 2013UT Spot80.4240 in0.4153 in