CONCEPT DEMONSTRATION
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V-1177 — Rich MDEA Amine Vessel V-1177

Delayed Coker · Rich MDEA Amine service · Installed Sep 1, 1986 (40 yrs in service)

Low-Medium
Current Min. Thickness
0.964 in
t-min 0.917 in
Measured Corrosion Rate
1.59 mpy
ML-predicted: 1.63 mpy
Remaining Life
29.5 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. 2
Joint Efficiency1.00
Design Pressure274 psig
Design Temperature598 °F
Operating Pressure215 psig
Operating Temperature418 °F
Diameter121 in
Nominal Thickness1.038 in
Corrosion Allowance0.0938 in
H2S / Chloride137 / 24 ppm
Flow Velocity14.3 ft/s
Process pH6.14
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
6.19 mpy
Predicted corrosion rate under these conditions (+4.60 mpy vs. current measured rate)
Implied Remaining Life
7.6 yrs
Implied Reinspection Interval
3.8 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 — Amine Corrosion

API 571 §4.2.4

Localized corrosion in amine treating services, accelerated by high velocity, heat-stable salts, and CO2/H2S loading.

Recommended inspection approach: UT thickness at high-turbulence points (elbows, tees, reboiler returns); monitor amine quality (HSAS, degradation products).

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Spot80.9763 in0.9641 in
Nov 27, 2025UT Grid + RT80.9732 in0.9730 in
May 26, 2023UT Grid + RT80.9786 in0.9597 in
Jan 27, 2021UT Grid + RT80.9822 in0.9694 in
Apr 8, 2018UT Spot80.9862 in0.9769 in
Jul 24, 2015UT Grid (API 572)80.9932 in0.9884 in
Apr 24, 2012UT Grid + RT80.9956 in0.9797 in
Nov 11, 2009UT Grid + RT80.9987 in0.9986 in
Nov 5, 2007UT Spot81.0025 in0.9995 in
Jan 10, 2006UT Spot81.0084 in0.9931 in
May 10, 2003UT Grid (API 572)81.0125 in0.9950 in
Mar 21, 2001UT Spot81.0158 in1.0007 in
Jul 9, 1999UT Grid (API 572)81.0151 in1.0019 in
Mar 27, 1996UT Grid (API 572)81.0206 in1.0137 in
May 15, 1994UT Grid (API 572)81.0251 in1.0147 in
Oct 22, 1992UT Grid + RT81.0318 in1.0306 in
Jun 9, 1991UT Spot81.0263 in1.0173 in
Nov 20, 1988UT Grid + RT81.0330 in1.0320 in