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V-1069 — Coker Vapor Drum V-1069

Sulfur Recovery Unit · Coker Vapor service · Installed Aug 27, 2004 (22 yrs in service)

High
Current Min. Thickness
0.996 in
t-min 1.063 in
Measured Corrosion Rate
6.78 mpy
ML-predicted: 6.82 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. 1
Joint Efficiency1.00
Design Pressure580 psig
Design Temperature404 °F
Operating Pressure376 psig
Operating Temperature278 °F
Diameter64 in
Nominal Thickness1.154 in
Corrosion Allowance0.0625 in
H2S / Chloride32 / 9 ppm
Flow Velocity10.7 ft/s
Process pH8.64
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
7.67 mpy
Predicted corrosion rate under these conditions (+0.89 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 + RT61.0042 in0.9957 in
Sep 30, 2024UT Grid (API 572)61.0165 in1.0125 in
Mar 29, 2023UT Spot61.0302 in1.0104 in
Aug 30, 2020UT Spot61.0479 in1.0296 in
Jan 25, 2019UT Grid (API 572)61.0594 in1.0505 in
May 26, 2016UT Grid + RT61.0740 in1.0704 in
Jul 8, 2014UT Grid + RT61.0921 in1.0819 in
Jan 7, 2013UT Grid + RT61.0979 in1.0973 in
Apr 3, 2010UT Grid + RT61.1135 in1.0994 in
Oct 1, 2007UT Grid (API 572)61.1355 in1.1262 in