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V-1262 — Boiler Feed Water Column V-1262

Sulfur Recovery Unit · Boiler Feed Water service · Installed Aug 30, 1994 (32 yrs in service)

Medium
Current Min. Thickness
0.439 in
t-min 0.549 in
Measured Corrosion Rate
6.25 mpy
ML-predicted: 6.00 mpy
Remaining Life
0.0 yrs
Next Inspection Due
Feb 20, 2027
Interval: 0.5 yrs (API 510)

UT Thickness Trend

Minimum CML reading per inspection vs. ASME Sec. VIII t-min

Vessel Specification

MaterialSA-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency1.00
Design Pressure198 psig
Design Temperature617 °F
Operating Pressure129 psig
Operating Temperature383 °F
Diameter98 in
Nominal Thickness0.647 in
Corrosion Allowance0.0625 in
H2S / Chloride5 / 217 ppm
Flow Velocity21.0 ft/s
Process pH7.99
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
5.34 mpy
Predicted corrosion rate under these conditions (-0.91 mpy vs. current measured rate)
Implied Remaining Life
0.0 yrs
Implied Reinspection Interval
0.5 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 + RT40.4465 in0.4390 in
Jan 8, 2025UT Grid + RT40.4552 in0.4492 in
Feb 10, 2022UT Grid + RT40.4729 in0.4544 in
Feb 29, 2020UT Grid + RT40.4884 in0.4715 in
Dec 17, 2017UT Spot40.5040 in0.4862 in
Nov 6, 2014UT Grid (API 572)40.5214 in0.5051 in
Sep 19, 2011UT Grid + RT40.5407 in0.5374 in
Dec 23, 2008UT Grid (API 572)40.5542 in0.5477 in
Feb 8, 2006UT Grid (API 572)40.5761 in0.5660 in
Sep 27, 2003UT Grid (API 572)40.5884 in0.5770 in
Jun 6, 2001UT Grid (API 572)40.6062 in0.6062 in
Nov 29, 1999UT Grid + RT40.6140 in0.5996 in
Aug 8, 1997UT Spot40.6260 in0.6240 in