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V-1294 — Rich MDEA Amine Vessel V-1294

Crude Distillation Unit · Rich MDEA Amine service · Installed Sep 1, 1987 (39 yrs in service)

High
Current Min. Thickness
1.540 in
t-min 2.600 in
Measured Corrosion Rate
30.61 mpy
ML-predicted: 19.75 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-240-316L Stainless
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency0.85
Design Pressure523 psig
Design Temperature498 °F
Operating Pressure413 psig
Operating Temperature380 °F
Diameter138 in
Nominal Thickness2.741 in
Corrosion Allowance0.0938 in
H2S / Chloride934 / 149 ppm
Flow Velocity8.2 ft/s
Process pH4.70
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
15.80 mpy
Predicted corrosion rate under these conditions (-14.81 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 — 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 + RT41.5465 in1.5403 in
Jul 13, 2025UT Grid (API 572)41.5814 in1.5743 in
Aug 17, 2023UT Grid (API 572)41.6384 in1.6303 in
Sep 5, 2020UT Grid + RT41.7309 in1.7261 in
Jun 17, 2018UT Spot41.8005 in1.7922 in
Aug 17, 2015UT Spot41.8866 in1.8825 in
Jun 5, 2013UT Grid + RT41.9518 in1.9431 in
Jun 25, 2010UT Grid (API 572)42.0407 in2.0401 in
Jul 9, 2008UT Grid (API 572)42.1005 in2.0940 in
May 9, 2005UT Grid + RT42.1986 in2.1840 in
Nov 21, 2003UT Grid + RT42.2458 in2.2369 in
Dec 19, 2001UT Spot42.3016 in2.2930 in
Feb 9, 1999UT Spot42.3884 in2.3765 in
Dec 19, 1996UT Grid + RT42.4560 in2.4475 in
Mar 12, 1995UT Grid (API 572)42.5103 in2.5000 in
Sep 29, 1993UT Spot42.5566 in2.5459 in
Sep 16, 1991UT Grid + RT42.6133 in2.5992 in
May 1, 1989UT Grid (API 572)42.6942 in2.6786 in