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V-1142 — Two-Phase Hydrocarbon Drum V-1142

Amine Treating Unit · Two-Phase Hydrocarbon service · Installed Aug 31, 1989 (37 yrs in service)

Low-Medium
Current Min. Thickness
0.571 in
t-min 0.493 in
Measured Corrosion Rate
1.16 mpy
ML-predicted: 1.87 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 Pressure498 psig
Design Temperature449 °F
Operating Pressure313 psig
Operating Temperature323 °F
Diameter39 in
Nominal Thickness0.626 in
Corrosion Allowance0.0625 in
H2S / Chloride27 / 146 ppm
Flow Velocity16.4 ft/s
Process pH5.35
InsulatedNo

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
3.65 mpy
Predicted corrosion rate under these conditions (+2.49 mpy vs. current measured rate)
Implied Remaining Life
21.5 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 — Erosion-Corrosion

API 571 §4.2.13

Mechanical removal of protective scale by high-velocity flow or entrained solids, accelerating the underlying corrosion mechanism.

Recommended inspection approach: UT thickness at flow-direction changes (elbows, reducers); review process velocity against API RP 14E erosional velocity limits.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Spot40.5814 in0.5713 in
May 28, 2026UT Grid + RT40.5803 in0.5671 in
Aug 25, 2024UT Grid + RT40.5864 in0.5699 in
Mar 25, 2023UT Spot40.5884 in0.5700 in
Feb 9, 2021UT Spot40.5923 in0.5825 in
Jun 20, 2018UT Grid (API 572)40.5954 in0.5941 in
Jul 20, 2016UT Grid + RT40.5964 in0.5956 in
Dec 24, 2013UT Grid + RT40.6000 in0.5949 in
Mar 8, 2012UT Grid (API 572)40.6006 in0.5953 in
Apr 3, 2010UT Grid + RT40.6045 in0.5997 in
Nov 6, 2008UT Grid (API 572)40.6017 in0.5851 in
Mar 9, 2006UT Spot40.6077 in0.6062 in
May 3, 2003UT Grid + RT40.6112 in0.6097 in
Aug 4, 2000UT Grid + RT40.6128 in0.6000 in
Jun 7, 1998UT Grid (API 572)40.6145 in0.6000 in
Aug 2, 1996UT Spot40.6164 in0.6101 in
Aug 8, 1993UT Grid + RT40.6266 in0.6145 in
Jan 5, 1992UT Grid (API 572)40.6222 in0.6173 in