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V-1352 — Two-Phase Hydrocarbon Drum V-1352

Alkylation Unit · Two-Phase Hydrocarbon service · Installed Aug 25, 2015 (11 yrs in service)

High
Current Min. Thickness
0.971 in
t-min 0.997 in
Measured Corrosion Rate
12.63 mpy
ML-predicted: 11.30 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. 2
Joint Efficiency1.00
Design Pressure455 psig
Design Temperature668 °F
Operating Pressure281 psig
Operating Temperature409 °F
Diameter72 in
Nominal Thickness1.118 in
Corrosion Allowance0.0938 in
H2S / Chloride26 / 281 ppm
Flow Velocity3.5 ft/s
Process pH6.44
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
11.17 mpy
Predicted corrosion rate under these conditions (-1.46 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)40.9785 in0.9709 in
Oct 4, 2025UT Spot40.9882 in0.9729 in
Aug 25, 2022UT Spot41.0261 in1.0107 in
Oct 14, 2019UT Grid + RT41.0651 in1.0499 in
Jan 12, 2018UT Grid + RT41.0835 in1.0689 in