V-1342 — Lean MDEA Amine Drum V-1342

Catalytic Reformer · Lean MDEA Amine service · Installed Aug 29, 1996 (30 yrs in service)

High

Current Min. Thickness

0.047 in

t-min 0.121 in

Measured Corrosion Rate

6.87 mpy

ML-predicted: 8.22 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 Efficiency1.00

Design Pressure60 psig

Design Temperature247 °F

Operating Pressure42 psig

Operating Temperature217 °F

Diameter67 in

Nominal Thickness0.281 in

Corrosion Allowance0.1250 in

H2S / Chloride746 / 19 ppm

Flow Velocity11.5 ft/s

Process pH5.10

InsulatedNo

Corrosion & Remaining-Life What-If

Adjust operating conditions to see the live model-predicted corrosion rate and implied remaining life

Operating Temperature217°F

H2S Concentration746 ppm

Chloride Concentration19 ppm

Flow Velocity11.5 ft/s

Process pH5.1

Insulated (CUI potential)

MaterialDamage Mechanism

Live Prediction — What-If Model

13.84 mpy

Predicted corrosion rate under these conditions (+6.97 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

Date	Method	CML Count	Avg Thickness	Min CML Thickness
Aug 22, 2026	UT Grid (API 572)	6	0.0603 in	0.0467 in
Oct 13, 2025	UT Grid (API 572)	6	0.0603 in	0.0415 in
Dec 1, 2022	UT Grid (API 572)	6	0.0603 in	0.0443 in
Apr 9, 2021	UT Grid + RT	6	0.0603 in	0.0505 in
Aug 6, 2018	UT Grid (API 572)	6	0.0603 in	0.0455 in
Mar 2, 2017	UT Grid + RT	6	0.0603 in	0.0517 in
Aug 5, 2014	UT Spot	6	0.0603 in	0.0442 in
Jan 29, 2013	UT Spot	6	0.0603 in	0.0577 in
Oct 28, 2010	UT Grid + RT	6	0.0640 in	0.0541 in
Apr 28, 2008	UT Spot	6	0.0991 in	0.0803 in
Aug 31, 2006	UT Grid + RT	6	0.1282 in	0.1098 in
Jul 11, 2003	UT Spot	6	0.1740 in	0.1717 in
Apr 20, 2001	UT Spot	6	0.2103 in	0.2001 in
Oct 26, 1999	UT Grid (API 572)	6	0.2316 in	0.2259 in