V-1293 — Rich MDEA Amine Drum V-1293

Hydrocracker · Rich MDEA Amine service · Installed Aug 29, 1997 (29 yrs in service)

High

Current Min. Thickness

0.089 in

t-min 0.209 in

Measured Corrosion Rate

3.29 mpy

ML-predicted: 11.61 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-240-304L Stainless

Design CodeASME BPVC Section VIII, Div. 2

Joint Efficiency0.85

Design Pressure102 psig

Design Temperature609 °F

Operating Pressure71 psig

Operating Temperature551 °F

Diameter58 in

Nominal Thickness0.305 in

Corrosion Allowance0.0625 in

H2S / Chloride890 / 137 ppm

Flow Velocity18.3 ft/s

Process pH5.47

InsulatedNo

Corrosion & Remaining-Life What-If

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

Operating Temperature551°F

H2S Concentration890 ppm

Chloride Concentration137 ppm

Flow Velocity18.3 ft/s

Process pH5.47

Insulated (CUI potential)

MaterialDamage Mechanism

Live Prediction — What-If Model

15.51 mpy

Predicted corrosion rate under these conditions (+12.22 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 Spot	6	0.1046 in	0.0886 in
Feb 13, 2025	UT Grid + RT	6	0.1046 in	0.0903 in
Jul 17, 2022	UT Grid + RT	6	0.1046 in	0.0948 in
May 29, 2019	UT Grid + RT	6	0.1046 in	0.0987 in
Nov 11, 2017	UT Grid + RT	6	0.1046 in	0.0968 in
Apr 7, 2016	UT Grid (API 572)	6	0.1046 in	0.1037 in
Apr 16, 2013	UT Grid + RT	6	0.1046 in	0.0909 in
Nov 19, 2011	UT Grid + RT	6	0.1046 in	0.1002 in
Dec 13, 2009	UT Spot	6	0.1046 in	0.0926 in
Nov 28, 2007	UT Grid (API 572)	6	0.1046 in	0.1042 in
Jan 25, 2006	UT Grid + RT	6	0.1046 in	0.0983 in
Aug 10, 2004	UT Grid (API 572)	6	0.1046 in	0.1027 in
Aug 22, 2002	UT Spot	6	0.1046 in	0.1030 in
Oct 22, 2000	UT Spot	6	0.1780 in	0.1740 in