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V-1164 — Two-Phase Hydrocarbon Vessel V-1164

Catalytic Reformer · Two-Phase Hydrocarbon service · Installed Aug 25, 2012 (14 yrs in service)

High
Current Min. Thickness
1.834 in
t-min 1.903 in
Measured Corrosion Rate
14.71 mpy
ML-predicted: 12.67 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-240-304L Stainless
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency0.85
Design Pressure453 psig
Design Temperature519 °F
Operating Pressure393 psig
Operating Temperature381 °F
Diameter117 in
Nominal Thickness2.048 in
Corrosion Allowance0.0938 in
H2S / Chloride22 / 5 ppm
Flow Velocity5.5 ft/s
Process pH5.74
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
11.31 mpy
Predicted corrosion rate under these conditions (-3.40 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 — Erosion-Corrosion

API 571 §4.2.13

Mechanical removal of protective scale by high-velocity flow or entrained solids, accelerating the underlying corrosion mechanism.

Recommended inspection approach: UT thickness at flow-direction changes (elbows, reducers); review process velocity against API RP 14E erosional velocity limits.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid (API 572)41.8448 in1.8338 in
Mar 6, 2026UT Grid + RT41.8474 in1.8346 in
Nov 23, 2022UT Grid + RT41.8995 in1.8935 in
Sep 17, 2019UT Grid + RT41.9451 in1.9432 in
Apr 17, 2018UT Grid (API 572)41.9667 in1.9605 in
Aug 22, 2016UT Grid + RT41.9905 in1.9838 in
Dec 28, 2014UT Spot42.0156 in1.9961 in