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V-1288 — Boiler Feed Water Vessel V-1288

Fluid Catalytic Cracker · Boiler Feed Water service · Installed Sep 1, 1984 (42 yrs in service)

Low
Current Min. Thickness
1.718 in
t-min 1.693 in
Measured Corrosion Rate
1.78 mpy
ML-predicted: 3.83 mpy
Remaining Life
13.7 yrs
Next Inspection Due
Jul 2, 2033
Interval: 6.9 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. 1
Joint Efficiency1.00
Design Pressure494 psig
Design Temperature150 °F
Operating Pressure304 psig
Operating Temperature117 °F
Diameter120 in
Nominal Thickness1.794 in
Corrosion Allowance0.0625 in
H2S / Chloride4 / 41 ppm
Flow Velocity19.4 ft/s
Process pH5.64
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
3.55 mpy
Predicted corrosion rate under these conditions (+1.77 mpy vs. current measured rate)
Implied Remaining Life
6.9 yrs
Implied Reinspection Interval
3.4 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 + RT61.7220 in1.7178 in
Nov 19, 2024UT Grid + RT61.7244 in1.7049 in
Nov 25, 2022UT Grid + RT61.7287 in1.7181 in
Jun 1, 2021UT Grid (API 572)61.7301 in1.7151 in
Oct 11, 2019UT Grid + RT61.7320 in1.7198 in
Sep 13, 2017UT Grid (API 572)61.7359 in1.7245 in
Feb 8, 2016UT Grid + RT61.7392 in1.7202 in
Jan 11, 2014UT Grid (API 572)61.7430 in1.7294 in
Oct 6, 2010UT Spot61.7455 in1.7281 in
Jul 22, 2007UT Grid (API 572)61.7541 in1.7525 in
Nov 25, 2005UT Spot61.7582 in1.7529 in
Oct 8, 2003UT Grid + RT61.7561 in1.7536 in
Oct 29, 2000UT Grid (API 572)61.7709 in1.7519 in
Apr 6, 1998UT Grid + RT61.7683 in1.7556 in
Jul 2, 1995UT Grid (API 572)61.7766 in1.7742 in
Jul 16, 1992UT Grid + RT61.7830 in1.7711 in
Apr 30, 1990UT Spot61.7881 in1.7796 in
Oct 23, 1988UT Grid + RT61.7883 in1.7875 in
Nov 21, 1986UT Spot61.7910 in1.7816 in