Calculators
Reactor TI Baseline Analysis
Compare current reactor skin thermocouple (TI) readings against a start-of-run baseline to detect hot spots, maldistribution, or accelerated catalyst deactivation. Computes TI-by-TI deviation, max deviation, mean shift, and alerts based on yellow / red thresholds.
Method: Per-TI deviation = current − baseline. Yellow alert > threshold and Red alert > threshold indicate localized hot spots, channeling, or non-uniform deactivation. The mean shift tracks bulk temperature creep (overall deactivation compensation), while the standard deviation of deviations flags increased maldistribution versus the baseline pattern. Typical refinery thresholds are 25 °F yellow, 50 °F red. References: API RP 571 — Damage Mechanisms Affecting Fixed Equipment; standard hydroprocessing reactor monitoring practice.
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