CONCEPT DEMONSTRATION
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V-1308 — Rich MDEA Amine Drum V-1308

Sulfur Recovery Unit · Rich MDEA Amine service · Installed Sep 1, 1985 (41 yrs in service)

Low-Medium
Current Min. Thickness
0.537 in
t-min 0.421 in
Measured Corrosion Rate
0.50 mpy
ML-predicted: 0.05 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. 1
Joint Efficiency1.00
Design Pressure396 psig
Design Temperature146 °F
Operating Pressure346 psig
Operating Temperature113 °F
Diameter42 in
Nominal Thickness0.556 in
Corrosion Allowance0.0625 in
H2S / Chloride728 / 72 ppm
Flow Velocity13.8 ft/s
Process pH5.57
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
4.37 mpy
Predicted corrosion rate under these conditions (+3.87 mpy vs. current measured rate)
Implied Remaining Life
26.5 yrs
Implied Reinspection Interval
10.0 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 + RT80.5413 in0.5369 in
Jun 28, 2023UT Spot80.5405 in0.5319 in
Jan 9, 2021UT Spot80.5429 in0.5413 in
May 26, 2019UT Grid + RT80.5411 in0.5256 in
Mar 30, 2017UT Grid + RT80.5436 in0.5397 in
Jul 18, 2014UT Grid + RT80.5451 in0.5253 in
Aug 24, 2012UT Grid (API 572)80.5437 in0.5414 in
Jun 15, 2010UT Grid + RT80.5496 in0.5387 in
May 6, 2007UT Spot80.5443 in0.5359 in
Dec 25, 2004UT Spot80.5466 in0.5345 in
Apr 13, 2002UT Grid + RT80.5500 in0.5305 in
Jun 13, 2000UT Spot80.5512 in0.5355 in
Mar 7, 1998UT Spot80.5521 in0.5509 in
Jul 13, 1996UT Grid (API 572)80.5528 in0.5465 in
Jun 18, 1994UT Spot80.5507 in0.5405 in
Nov 11, 1992UT Spot80.5504 in0.5339 in
Jul 15, 1990UT Spot80.5528 in0.5467 in
May 9, 1987UT Spot80.5519 in0.5377 in