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V-1303 — Lean MDEA Amine Column V-1303

Alkylation Unit · Lean MDEA Amine service · Installed Aug 29, 1997 (29 yrs in service)

High
Current Min. Thickness
1.262 in
t-min 2.106 in
Measured Corrosion Rate
31.91 mpy
ML-predicted: 24.90 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. 2
Joint Efficiency0.85
Design Pressure496 psig
Design Temperature577 °F
Operating Pressure408 psig
Operating Temperature348 °F
Diameter118 in
Nominal Thickness2.195 in
Corrosion Allowance0.0625 in
H2S / Chloride1198 / 127 ppm
Flow Velocity18.6 ft/s
Process pH5.27
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
16.22 mpy
Predicted corrosion rate under these conditions (-15.69 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 Spot61.2704 in1.2616 in
Apr 30, 2025UT Grid + RT61.3131 in1.2947 in
Jun 4, 2023UT Spot61.3707 in1.3654 in
Feb 25, 2021UT Spot61.4424 in1.4361 in
Jun 20, 2019UT Spot61.4978 in1.4908 in
Jun 25, 2017UT Grid (API 572)61.5632 in1.5502 in
Jul 8, 2015UT Grid + RT61.6243 in1.6053 in
Apr 30, 2012UT Grid (API 572)61.7296 in1.7124 in
Dec 8, 2010UT Spot61.7725 in1.7606 in
Nov 20, 2007UT Grid (API 572)61.8698 in1.8598 in
May 15, 2006UT Spot61.9156 in1.9015 in
Jan 11, 2004UT Grid (API 572)61.9905 in1.9796 in
Nov 23, 2000UT Grid (API 572)62.0918 in2.0816 in