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V-1240 — Coker Vapor Vessel V-1240

Catalytic Reformer · Coker Vapor service · Installed Aug 31, 1989 (37 yrs in service)

Low-Medium
Current Min. Thickness
0.883 in
t-min 0.798 in
Measured Corrosion Rate
2.70 mpy
ML-predicted: 4.24 mpy
Remaining Life
31.2 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency1.00
Design Pressure243 psig
Design Temperature114 °F
Operating Pressure170 psig
Operating Temperature77 °F
Diameter116 in
Nominal Thickness0.983 in
Corrosion Allowance0.1250 in
H2S / Chloride31 / 118 ppm
Flow Velocity17.9 ft/s
Process pH8.37
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
3.74 mpy
Predicted corrosion rate under these conditions (+1.04 mpy vs. current measured rate)
Implied Remaining Life
22.6 yrs
Implied Reinspection Interval
10.0 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)80.8840 in0.8826 in
Jul 21, 2026UT Grid (API 572)80.8859 in0.8819 in
Dec 16, 2024UT Grid (API 572)80.8846 in0.8689 in
Nov 13, 2021UT Grid (API 572)80.8960 in0.8948 in
Nov 13, 2018UT Grid + RT80.9012 in0.8927 in
Sep 21, 2015UT Grid (API 572)80.9121 in0.8956 in
May 30, 2013UT Grid + RT80.9175 in0.9047 in
Jul 9, 2011UT Grid (API 572)80.9273 in0.9256 in
Apr 17, 2008UT Grid (API 572)80.9339 in0.9329 in
Nov 23, 2005UT Grid + RT80.9393 in0.9269 in
Mar 8, 2004UT Grid + RT80.9437 in0.9314 in
Dec 4, 2000UT Grid + RT80.9530 in0.9529 in
Jul 9, 1998UT Grid (API 572)80.9601 in0.9571 in
Jan 21, 1996UT Grid + RT80.9638 in0.9595 in
Jun 30, 1993UT Grid + RT80.9712 in0.9710 in
Nov 25, 1991UT Grid + RT80.9781 in0.9616 in