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V-1320 — Boiler Feed Water Drum V-1320

Hydrocracker · Boiler Feed Water service · Installed Sep 1, 1986 (40 yrs in service)

Low
Current Min. Thickness
0.405 in
t-min 0.243 in
Measured Corrosion Rate
0.50 mpy
ML-predicted: 1.36 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 Pressure186 psig
Design Temperature423 °F
Operating Pressure120 psig
Operating Temperature312 °F
Diameter52 in
Nominal Thickness0.438 in
Corrosion Allowance0.1250 in
H2S / Chloride42 / 71 ppm
Flow Velocity5.5 ft/s
Process pH4.72
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
0.10 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 Spot40.4244 in0.4045 in
Nov 11, 2025UT Grid (API 572)40.4241 in0.4085 in
Aug 11, 2023UT Grid (API 572)40.4194 in0.4189 in
Jul 20, 2020UT Spot40.4210 in0.4192 in
Oct 22, 2018UT Grid + RT40.4257 in0.4079 in
Sep 2, 2015UT Grid + RT40.4261 in0.4142 in
Aug 9, 2013UT Grid + RT40.4270 in0.4156 in
Oct 12, 2011UT Spot40.4257 in0.4120 in
Jul 28, 2009UT Grid (API 572)40.4283 in0.4251 in
Sep 30, 2007UT Spot40.4264 in0.4227 in
Nov 13, 2004UT Grid + RT40.4306 in0.4159 in
Sep 18, 2001UT Grid (API 572)40.4309 in0.4153 in
Nov 9, 1998UT Grid + RT40.4344 in0.4321 in
Apr 22, 1996UT Spot40.4352 in0.4344 in
Dec 8, 1994UT Grid (API 572)40.4353 in0.4241 in
Mar 28, 1993UT Spot40.4367 in0.4327 in
Jan 14, 1991UT Grid + RT40.4344 in0.4257 in
Feb 4, 1989UT Grid (API 572)40.4392 in0.4276 in