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V-1291 — Two-Phase Hydrocarbon Column V-1291

Catalytic Reformer · Two-Phase Hydrocarbon service · Installed Aug 29, 1999 (27 yrs in service)

High
Current Min. Thickness
0.456 in
t-min 0.691 in
Measured Corrosion Rate
12.79 mpy
ML-predicted: 9.31 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 Pressure220 psig
Design Temperature300 °F
Operating Pressure175 psig
Operating Temperature272 °F
Diameter104 in
Nominal Thickness0.809 in
Corrosion Allowance0.0625 in
H2S / Chloride2 / 222 ppm
Flow Velocity10.0 ft/s
Process pH5.49
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
10.35 mpy
Predicted corrosion rate under these conditions (-2.44 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 — 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 Grid (API 572)40.4628 in0.4561 in
Nov 10, 2025UT Grid (API 572)40.4750 in0.4574 in
Feb 5, 2024UT Spot40.4990 in0.4984 in
Jun 27, 2021UT Spot40.5303 in0.5178 in
Mar 22, 2018UT Grid (API 572)40.5705 in0.5679 in
Oct 23, 2015UT Spot40.6017 in0.5925 in
Feb 14, 2014UT Grid + RT40.6247 in0.6076 in
Feb 1, 2011UT Grid (API 572)40.6608 in0.6538 in
Jun 24, 2009UT Grid (API 572)40.6821 in0.6665 in
Jun 6, 2007UT Spot40.7097 in0.7078 in
Oct 8, 2005UT Spot40.7308 in0.7178 in
Feb 15, 2003UT Grid + RT40.7664 in0.7510 in
Jul 23, 2001UT Grid + RT40.7870 in0.7685 in