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V-1030 — Coker Vapor Vessel V-1030

Alkylation Unit · Coker Vapor service · Installed Aug 29, 1996 (30 yrs in service)

High
Current Min. Thickness
1.682 in
t-min 1.794 in
Measured Corrosion Rate
7.40 mpy
ML-predicted: 6.85 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency0.85
Design Pressure417 psig
Design Temperature434 °F
Operating Pressure365 psig
Operating Temperature317 °F
Diameter128 in
Nominal Thickness1.913 in
Corrosion Allowance0.0625 in
H2S / Chloride50 / 44 ppm
Flow Velocity2.1 ft/s
Process pH7.80
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
6.65 mpy
Predicted corrosion rate under these conditions (-0.75 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 + RT41.6906 in1.6820 in
Aug 5, 2026UT Grid + RT41.6929 in1.6826 in
May 13, 2024UT Spot41.7077 in1.6959 in
Jun 5, 2021UT Spot41.7301 in1.7206 in
Mar 30, 2018UT Grid (API 572)41.7548 in1.7513 in
Aug 25, 2015UT Grid + RT41.7721 in1.7703 in
Aug 23, 2012UT Spot41.7980 in1.7866 in
Dec 9, 2010UT Spot41.8093 in1.8010 in
Mar 7, 2008UT Grid + RT41.8292 in1.8223 in
Oct 24, 2005UT Grid + RT41.8437 in1.8431 in
Apr 29, 2003UT Grid (API 572)41.8624 in1.8525 in
Jan 1, 2001UT Spot41.8826 in1.8709 in
Mar 23, 1999UT Spot41.8961 in1.8919 in