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V-1314 — Cooling Water Vessel V-1314

Crude Distillation Unit · Cooling Water service · Installed Aug 26, 2008 (18 yrs in service)

Low
Current Min. Thickness
0.743 in
t-min 0.650 in
Measured Corrosion Rate
0.64 mpy
ML-predicted: 2.45 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-387-11 Cl.2 (1.25Cr-0.5Mo)
Design CodeASME BPVC Section VIII, Div. 1
Joint Efficiency1.00
Design Pressure207 psig
Design Temperature396 °F
Operating Pressure122 psig
Operating Temperature355 °F
Diameter111 in
Nominal Thickness0.768 in
Corrosion Allowance0.0625 in
H2S / Chloride42 / 1566 ppm
Flow Velocity20.9 ft/s
Process pH5.49
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
2.09 mpy
Predicted corrosion rate under these conditions (+1.45 mpy vs. current measured rate)
Implied Remaining Life
44.3 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 — Chloride Stress Corrosion Cracking (Cl-SCC)

API 571 §4.5.2

Cracking of austenitic stainless steel exposed to chlorides above roughly 140°F under tensile stress; not a thickness-loss mechanism.

Recommended inspection approach: Surface/near-surface NDE (PT, ECT) at susceptible welds and CUI-prone insulated stainless piping; chloride source control.

This mechanism is crack-dominant — thickness monitoring alone will not detect it. See Standards & Documentation for the full NDE requirement.

Inspection History

UT thickness readings, most recent first

DateMethodCML CountAvg ThicknessMin CML Thickness
Aug 22, 2026UT Spot40.7606 in0.7427 in
Nov 22, 2025UT Grid (API 572)40.7548 in0.7348 in
Dec 23, 2023UT Spot40.7560 in0.7505 in
Oct 11, 2021UT Spot40.7604 in0.7421 in
Sep 2, 2019UT Grid + RT40.7589 in0.7458 in
Jun 17, 2017UT Spot40.7609 in0.7444 in
Jan 24, 2016UT Grid + RT40.7657 in0.7488 in
Apr 30, 2013UT Grid + RT40.7683 in0.7547 in
Jul 16, 2011UT Grid (API 572)40.7637 in0.7544 in