V-1027 — Lean MDEA Amine Drum V-1027

Catalytic Reformer · Lean MDEA Amine service · Installed Sep 1, 1987 (39 yrs in service)

Low-Medium

Current Min. Thickness

0.419 in

t-min 0.352 in

Measured Corrosion Rate

1.96 mpy

ML-predicted: 1.91 mpy

Remaining Life

34.2 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 Pressure222 psig

Design Temperature454 °F

Operating Pressure155 psig

Operating Temperature385 °F

Diameter63 in

Nominal Thickness0.511 in

Corrosion Allowance0.1250 in

H2S / Chloride1101 / 193 ppm

Flow Velocity15.6 ft/s

Process pH6.42

InsulatedNo

Corrosion & Remaining-Life What-If

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

Operating Temperature385°F

H2S Concentration1101 ppm

Chloride Concentration193 ppm

Flow Velocity15.6 ft/s

Process pH6.42

Insulated (CUI potential)

MaterialDamage Mechanism

Live Prediction — What-If Model

7.21 mpy

Predicted corrosion rate under these conditions (+5.25 mpy vs. current measured rate)

Implied Remaining Life

9.3 yrs

Implied Reinspection Interval

4.6 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 + RT	8	0.4371 in	0.4189 in
Dec 9, 2024	UT Grid (API 572)	8	0.4356 in	0.4257 in
Jul 26, 2022	UT Grid (API 572)	8	0.4416 in	0.4393 in
Sep 10, 2019	UT Grid + RT	8	0.4463 in	0.4300 in
Aug 22, 2016	UT Grid + RT	8	0.4575 in	0.4497 in
Nov 13, 2014	UT Spot	8	0.4583 in	0.4405 in
Jun 13, 2012	UT Grid (API 572)	8	0.4647 in	0.4531 in
Nov 22, 2009	UT Grid + RT	8	0.4667 in	0.4521 in
Jul 12, 2007	UT Spot	8	0.4707 in	0.4517 in
Jul 14, 2005	UT Grid (API 572)	8	0.4750 in	0.4573 in
Apr 3, 2003	UT Grid + RT	8	0.4801 in	0.4667 in
Dec 29, 1999	UT Spot	8	0.4884 in	0.4825 in
Sep 9, 1997	UT Grid (API 572)	8	0.4950 in	0.4941 in
Mar 11, 1995	UT Spot	8	0.4938 in	0.4840 in
Sep 30, 1992	UT Grid + RT	8	0.4997 in	0.4893 in
Oct 19, 1989	UT Grid + RT	8	0.5074 in	0.4922 in