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V-1307 — Lean MDEA Amine Vessel V-1307

Alkylation Unit · Lean MDEA Amine service · Installed Sep 1, 1987 (39 yrs in service)

High
Current Min. Thickness
0.760 in
t-min 1.524 in
Measured Corrosion Rate
21.36 mpy
ML-predicted: 20.56 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. 1
Joint Efficiency1.00
Design Pressure451 psig
Design Temperature650 °F
Operating Pressure264 psig
Operating Temperature594 °F
Diameter111 in
Nominal Thickness1.606 in
Corrosion Allowance0.0625 in
H2S / Chloride452 / 33 ppm
Flow Velocity17.7 ft/s
Process pH4.68
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
14.58 mpy
Predicted corrosion rate under these conditions (-6.78 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 Spot80.7618 in0.7600 in
Jun 14, 2025UT Grid + RT80.7618 in0.7462 in
Jan 26, 2023UT Grid (API 572)80.7618 in0.7543 in
Jul 14, 2021UT Spot80.7618 in0.7514 in
May 7, 2018UT Grid (API 572)80.7618 in0.7503 in
Dec 4, 2015UT Spot80.7618 in0.7583 in
Apr 26, 2014UT Grid + RT80.7618 in0.7488 in
Feb 7, 2011UT Grid + RT80.7618 in0.7473 in
Feb 5, 2009UT Grid (API 572)80.7618 in0.7495 in
Apr 15, 2006UT Grid (API 572)80.8585 in0.8541 in
Jun 16, 2003UT Spot80.9766 in0.9587 in
Apr 28, 2000UT Grid (API 572)81.0995 in1.0952 in
Aug 30, 1998UT Grid + RT81.1670 in1.1640 in
Jan 4, 1996UT Grid (API 572)81.2706 in1.2663 in
Mar 24, 1993UT Grid (API 572)81.3861 in1.3753 in
May 16, 1990UT Grid + RT81.5001 in1.4823 in