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V-1035 — Two-Phase Hydrocarbon Vessel V-1035

Alkylation Unit · Two-Phase Hydrocarbon service · Installed Aug 31, 1990 (36 yrs in service)

Low-Medium
Current Min. Thickness
0.952 in
t-min 0.905 in
Measured Corrosion Rate
2.18 mpy
ML-predicted: 1.59 mpy
Remaining Life
21.4 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 Efficiency0.85
Design Pressure260 psig
Design Temperature737 °F
Operating Pressure232 psig
Operating Temperature631 °F
Diameter92 in
Nominal Thickness1.037 in
Corrosion Allowance0.0625 in
H2S / Chloride31 / 21 ppm
Flow Velocity17.2 ft/s
Process pH6.01
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
3.08 mpy
Predicted corrosion rate under these conditions (+0.90 mpy vs. current measured rate)
Implied Remaining Life
15.1 yrs
Implied Reinspection Interval
7.6 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 — 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)40.9584 in0.9515 in
Jul 4, 2026UT Grid + RT40.9573 in0.9535 in
Jan 12, 2025UT Grid (API 572)40.9638 in0.9572 in
Mar 11, 2023UT Grid (API 572)40.9669 in0.9502 in
May 6, 2021UT Grid (API 572)40.9697 in0.9557 in
Sep 6, 2018UT Spot40.9738 in0.9562 in
Jun 30, 2016UT Grid + RT40.9789 in0.9722 in
Oct 20, 2013UT Spot40.9851 in0.9827 in
May 5, 2012UT Grid + RT40.9857 in0.9781 in
Jun 14, 2010UT Spot40.9928 in0.9863 in
Aug 13, 2007UT Spot40.9985 in0.9927 in
Jan 22, 2005UT Grid + RT41.0056 in0.9866 in
Oct 14, 2002UT Spot41.0081 in1.0051 in
Nov 29, 2000UT Grid (API 572)41.0137 in1.0070 in
Apr 26, 1998UT Grid + RT41.0215 in1.0202 in
Jun 3, 1995UT Grid + RT41.0289 in1.0097 in
Nov 23, 1993UT Grid + RT41.0267 in1.0235 in