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V-1050 — Crude Oil Drum V-1050

Fluid Catalytic Cracker · Crude Oil service · Installed Aug 27, 2004 (22 yrs in service)

Medium
Current Min. Thickness
1.218 in
t-min 1.111 in
Measured Corrosion Rate
1.72 mpy
ML-predicted: 1.33 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 Pressure580 psig
Design Temperature577 °F
Operating Pressure519 psig
Operating Temperature459 °F
Diameter70 in
Nominal Thickness1.275 in
Corrosion Allowance0.1250 in
H2S / Chloride16 / 241 ppm
Flow Velocity10.8 ft/s
Process pH7.08
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
9.48 mpy
Predicted corrosion rate under these conditions (+7.76 mpy vs. current measured rate)
Implied Remaining Life
11.3 yrs
Implied Reinspection Interval
5.6 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 — Naphthenic Acid Corrosion

API 571 §4.2.10

Aggressive, velocity-assisted corrosion in high-TAN crude fractions, most severe 450–750°F; low-alloy/carbon steel is far more susceptible than Mo-bearing or 316 SS.

Recommended inspection approach: UT thickness at high-velocity/turbulent locations; feed TAN monitoring; consider alloy upgrade per API 571 guidance.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Spot81.2377 in1.2182 in
Nov 24, 2025UT Grid + RT81.2392 in1.2309 in
Jul 6, 2024UT Grid (API 572)81.2447 in1.2383 in
Dec 7, 2022UT Spot81.2441 in1.2272 in
Mar 6, 2021UT Grid (API 572)81.2424 in1.2324 in
Nov 28, 2018UT Spot81.2514 in1.2456 in
Nov 13, 2016UT Grid (API 572)81.2490 in1.2306 in
Jan 25, 2015UT Grid + RT81.2575 in1.2451 in
Jun 17, 2013UT Grid + RT81.2629 in1.2499 in
May 9, 2011UT Grid (API 572)81.2674 in1.2657 in
Mar 13, 2009UT Grid (API 572)81.2711 in1.2618 in
Feb 23, 2006UT Grid (API 572)81.2697 in1.2669 in