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V-1048 — Lean MDEA Amine Drum V-1048

Hydrocracker · Lean MDEA Amine service · Installed Aug 31, 1990 (36 yrs in service)

Low-Medium
Current Min. Thickness
0.656 in
t-min 0.546 in
Measured Corrosion Rate
0.50 mpy
ML-predicted: -1.41 mpy
Remaining Life
60+ 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 Pressure263 psig
Design Temperature172 °F
Operating Pressure223 psig
Operating Temperature121 °F
Diameter70 in
Nominal Thickness0.676 in
Corrosion Allowance0.0938 in
H2S / Chloride420 / 174 ppm
Flow Velocity21.9 ft/s
Process pH5.07
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
5.88 mpy
Predicted corrosion rate under these conditions (+5.38 mpy vs. current measured rate)
Implied Remaining Life
18.7 yrs
Implied Reinspection Interval
9.3 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 + RT80.6602 in0.6564 in
May 27, 2026UT Grid + RT80.6623 in0.6537 in
Apr 19, 2024UT Spot80.6630 in0.6465 in
Jul 12, 2021UT Spot80.6647 in0.6633 in
Jun 16, 2019UT Spot80.6672 in0.6555 in
Dec 16, 2017UT Grid (API 572)80.6674 in0.6518 in
Apr 2, 2015UT Grid + RT80.6713 in0.6667 in
Aug 22, 2013UT Grid + RT80.6681 in0.6580 in
Oct 25, 2011UT Grid + RT80.6691 in0.6549 in
Apr 7, 2009UT Spot80.6697 in0.6499 in
Mar 28, 2007UT Grid (API 572)80.6692 in0.6583 in
Aug 10, 2005UT Grid + RT80.6693 in0.6624 in
Jun 28, 2002UT Grid (API 572)80.6743 in0.6549 in
Aug 15, 2000UT Grid + RT80.6738 in0.6712 in
Aug 18, 1998UT Grid (API 572)80.6718 in0.6546 in
Jan 4, 1997UT Spot80.6761 in0.6662 in
Nov 22, 1993UT Grid (API 572)80.6727 in0.6592 in