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V-1163 — Rich MDEA Amine Drum V-1163

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

High
Current Min. Thickness
0.553 in
t-min 1.130 in
Measured Corrosion Rate
19.50 mpy
ML-predicted: 19.24 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency1.00
Design Pressure477 psig
Design Temperature646 °F
Operating Pressure320 psig
Operating Temperature476 °F
Diameter83 in
Nominal Thickness1.272 in
Corrosion Allowance0.0938 in
H2S / Chloride969 / 208 ppm
Flow Velocity3.1 ft/s
Process pH4.20
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
11.75 mpy
Predicted corrosion rate under these conditions (-7.75 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 + RT80.5651 in0.5531 in
Dec 6, 2025UT Spot80.5651 in0.5526 in
Oct 30, 2023UT Grid + RT80.5651 in0.5485 in
Mar 26, 2021UT Grid (API 572)80.5651 in0.5506 in
Apr 28, 2019UT Grid + RT80.5651 in0.5631 in
May 16, 2017UT Spot80.5651 in0.5625 in
Oct 7, 2014UT Grid (API 572)80.6043 in0.5982 in
Aug 18, 2012UT Grid (API 572)80.6583 in0.6513 in
Apr 15, 2010UT Spot80.7136 in0.7031 in
Nov 18, 2008UT Spot80.7481 in0.7447 in
Aug 29, 2006UT Spot80.8025 in0.7901 in
Feb 23, 2005UT Grid + RT80.8412 in0.8223 in
Jun 25, 2003UT Grid (API 572)80.8840 in0.8717 in
Jan 23, 2001UT Grid + RT80.9413 in0.9354 in
May 28, 1999UT Spot80.9863 in0.9789 in
Feb 14, 1997UT Spot81.0423 in1.0357 in
Oct 18, 1994UT Grid (API 572)81.0944 in1.0833 in
Feb 23, 1992UT Spot81.1639 in1.1624 in
Jul 14, 1989UT Grid + RT81.2261 in1.2093 in