V-1021 — Hot Hydrocarbon Vapor Column V-1021
Hydrocracker · Hot Hydrocarbon Vapor service · Installed Aug 29, 1998 (28 yrs in service)
UT Thickness Trend
Minimum CML reading per inspection vs. ASME Sec. VIII t-min
Vessel Specification
Corrosion & Remaining-Life What-If
Adjust operating conditions to see the live model-predicted corrosion rate and implied remaining life
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 — Corrosion Under Insulation (CUI)
API 571 §4.3.5
Localized external corrosion beneath insulation where moisture is trapped, most severe in the 140–250°F operating band.
Recommended inspection approach: Insulation removal at high-risk locations (nozzles, low points), profile radiography, or guided-wave UT screening per API 570/RP 583.
Inspection History
UT thickness readings, most recent first