CONCEPT DEMONSTRATION
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V-1295 — Rich MDEA Amine Drum V-1295

Hydrocracker · Rich MDEA Amine service · Installed Aug 31, 1991 (35 yrs in service)

Low-Medium
Current Min. Thickness
0.948 in
t-min 0.890 in
Measured Corrosion Rate
1.55 mpy
ML-predicted: 2.43 mpy
Remaining Life
37.1 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 Efficiency0.85
Design Pressure643 psig
Design Temperature349 °F
Operating Pressure379 psig
Operating Temperature328 °F
Diameter46 in
Nominal Thickness1.010 in
Corrosion Allowance0.0938 in
H2S / Chloride810 / 157 ppm
Flow Velocity13.4 ft/s
Process pH6.41
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
7.85 mpy
Predicted corrosion rate under these conditions (+6.30 mpy vs. current measured rate)
Implied Remaining Life
7.3 yrs
Implied Reinspection Interval
3.7 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 Grid (API 572)80.9551 in0.9478 in
Dec 1, 2024UT Grid (API 572)80.9579 in0.9522 in
May 15, 2023UT Grid + RT80.9614 in0.9567 in
Dec 15, 2021UT Spot80.9633 in0.9527 in
Dec 23, 2018UT Spot80.9703 in0.9568 in
May 24, 2017UT Grid + RT80.9690 in0.9675 in
May 5, 2015UT Spot80.9716 in0.9707 in
Jun 21, 2013UT Grid (API 572)80.9769 in0.9729 in
Jul 23, 2010UT Spot80.9806 in0.9698 in
Dec 3, 2007UT Grid + RT80.9863 in0.9765 in
Jul 3, 2005UT Spot80.9892 in0.9779 in
Oct 10, 2002UT Grid + RT80.9924 in0.9753 in
Nov 14, 2000UT Grid + RT80.9978 in0.9786 in
Feb 12, 1998UT Spot81.0006 in0.9988 in
Aug 21, 1996UT Grid + RT81.0030 in1.0012 in
Jan 21, 1995UT Grid (API 572)81.0036 in1.0014 in
Apr 6, 1993UT Grid + RT81.0069 in1.0005 in