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V-1116 — Lean MDEA Amine Vessel V-1116

Alkylation Unit · Lean MDEA Amine service · Installed Sep 1, 1985 (41 yrs in service)

High
Current Min. Thickness
1.996 in
t-min 2.334 in
Measured Corrosion Rate
12.58 mpy
ML-predicted: 11.75 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. 2
Joint Efficiency1.00
Design Pressure587 psig
Design Temperature186 °F
Operating Pressure449 psig
Operating Temperature173 °F
Diameter130 in
Nominal Thickness2.526 in
Corrosion Allowance0.1250 in
H2S / Chloride1027 / 14 ppm
Flow Velocity15.4 ft/s
Process pH6.29
InsulatedYes

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
13.45 mpy
Predicted corrosion rate under these conditions (+0.87 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 + RT42.0087 in1.9957 in
Oct 14, 2024UT Grid + RT42.0319 in2.0278 in
Feb 21, 2022UT Grid (API 572)42.0654 in2.0561 in
Dec 29, 2018UT Spot42.1096 in2.0898 in
Jan 6, 2017UT Grid (API 572)42.1294 in2.1285 in
Nov 2, 2014UT Grid (API 572)42.1582 in2.1535 in
Nov 30, 2012UT Spot42.1806 in2.1662 in
Nov 28, 2010UT Grid + RT42.2073 in2.2036 in
Sep 23, 2008UT Grid (API 572)42.2356 in2.2255 in
Dec 29, 2005UT Spot42.2695 in2.2555 in
Apr 16, 2004UT Grid + RT42.2923 in2.2923 in
Jun 16, 2001UT Spot42.3262 in2.3065 in
Oct 13, 1999UT Grid + RT42.3473 in2.3329 in
Jun 18, 1997UT Grid (API 572)42.3792 in2.3733 in
Dec 27, 1995UT Spot42.3958 in2.3894 in
Apr 9, 1994UT Grid (API 572)42.4128 in2.4066 in
Mar 12, 1992UT Grid (API 572)42.4427 in2.4423 in
Mar 27, 1990UT Spot42.4703 in2.4696 in
May 5, 1987UT Grid (API 572)42.5021 in2.4912 in