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V-1267 — Boiler Feed Water Vessel V-1267

Sulfur Recovery Unit · Boiler Feed Water service · Installed Aug 27, 2007 (19 yrs in service)

Low
Current Min. Thickness
0.851 in
t-min 0.700 in
Measured Corrosion Rate
0.50 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. 1
Joint Efficiency0.85
Design Pressure259 psig
Design Temperature317 °F
Operating Pressure187 psig
Operating Temperature246 °F
Diameter91 in
Nominal Thickness0.875 in
Corrosion Allowance0.1250 in
H2S / Chloride10 / 195 ppm
Flow Velocity1.6 ft/s
Process pH6.58
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
0.10 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 + RT80.8652 in0.8513 in
Sep 23, 2025UT Grid (API 572)80.8656 in0.8646 in
Apr 12, 2024UT Spot80.8679 in0.8518 in
Oct 24, 2022UT Grid + RT80.8693 in0.8538 in
Aug 21, 2019UT Spot80.8692 in0.8593 in
Jul 6, 2016UT Spot80.8703 in0.8524 in
Sep 19, 2014UT Grid (API 572)80.8724 in0.8588 in
Mar 30, 2013UT Spot80.8729 in0.8548 in
May 14, 2010UT Grid (API 572)80.8738 in0.8674 in