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V-1184 — Coker Vapor Vessel V-1184

Delayed Coker · Coker Vapor service · Installed Sep 1, 1985 (41 yrs in service)

High
Current Min. Thickness
0.594 in
t-min 0.698 in
Measured Corrosion Rate
5.44 mpy
ML-predicted: 6.53 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. 1
Joint Efficiency1.00
Design Pressure161 psig
Design Temperature156 °F
Operating Pressure123 psig
Operating Temperature139 °F
Diameter144 in
Nominal Thickness0.821 in
Corrosion Allowance0.0625 in
H2S / Chloride31 / 170 ppm
Flow Velocity6.9 ft/s
Process pH8.84
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
4.91 mpy
Predicted corrosion rate under these conditions (-0.53 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 Spot40.5972 in0.5938 in
Jul 7, 2024UT Spot40.6099 in0.5967 in
Feb 11, 2022UT Grid (API 572)40.6256 in0.6146 in
Jun 28, 2020UT Grid + RT40.6305 in0.6196 in
Jan 1, 2019UT Spot40.6417 in0.6320 in
Oct 19, 2015UT Spot40.6587 in0.6413 in
Feb 26, 2014UT Grid + RT40.6660 in0.6622 in
May 11, 2012UT Spot40.6763 in0.6627 in
Feb 21, 2010UT Grid (API 572)40.6892 in0.6693 in
Jun 6, 2007UT Grid + RT40.7027 in0.6944 in
Apr 27, 2004UT Grid (API 572)40.7183 in0.7008 in
Feb 9, 2002UT Grid (API 572)40.7325 in0.7313 in
Apr 10, 2000UT Spot40.7436 in0.7316 in
Jan 9, 1997UT Grid (API 572)40.7583 in0.7427 in
Jan 27, 1995UT Grid + RT40.7696 in0.7498 in
Aug 6, 1993UT Grid (API 572)40.7808 in0.7630 in
Sep 17, 1990UT Spot40.7931 in0.7826 in
Nov 20, 1988UT Grid (API 572)40.8076 in0.7924 in
May 9, 1987UT Grid + RT40.8107 in0.7991 in