CONCEPT DEMONSTRATION
66Phillips 66Vessel Integrity Intelligence
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V-1204 — Steam Condensate Vessel V-1204

Alkylation Unit · Steam Condensate service · Installed Aug 27, 2005 (21 yrs in service)

Low
Current Min. Thickness
1.442 in
t-min 1.399 in
Measured Corrosion Rate
1.36 mpy
ML-predicted: 2.92 mpy
Remaining Life
31.7 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 2
Joint Efficiency0.85
Design Pressure301 psig
Design Temperature109 °F
Operating Pressure189 psig
Operating Temperature87 °F
Diameter139 in
Nominal Thickness1.486 in
Corrosion Allowance0.0625 in
H2S / Chloride9 / 1 ppm
Flow Velocity17.0 ft/s
Process pH7.13
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
3.30 mpy
Predicted corrosion rate under these conditions (+1.94 mpy vs. current measured rate)
Implied Remaining Life
13.0 yrs
Implied Reinspection Interval
6.5 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 — General Corrosion

API 571 §4.2.1

Uniform thinning across the surface due to the process environment. Rate depends on fluid chemistry, temperature, and velocity.

Recommended inspection approach: UT thickness grid at fixed CMLs per API 510/572; trend over time to establish long-term rate.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Grid + RT41.4596 in1.4425 in
Aug 4, 2026UT Spot41.4584 in1.4496 in
May 5, 2023UT Spot41.4623 in1.4561 in
Mar 12, 2021UT Spot41.4644 in1.4586 in
Mar 25, 2019UT Grid + RT41.4654 in1.4485 in
May 10, 2017UT Grid + RT41.4724 in1.4690 in
Oct 10, 2014UT Spot41.4752 in1.4699 in
Aug 3, 2012UT Spot41.4776 in1.4685 in
Aug 7, 2010UT Grid (API 572)41.4814 in1.4776 in
Nov 7, 2007UT Grid + RT41.4836 in1.4790 in