Calculators
Hydrotreater WABT Calculator
Weighted average bed temperature (WABT) for a three-bed fixed-bed hydrotreater using the API 932–A convention. Bed WABT = (Tin + 2·Tout)/3. Reactor WABT is the catalyst-weight–weighted average across beds, with deactivation rate and end-of-run projection.
Method: Bed WABT = (Tinlet + 2·Toutlet)/3 per API 932–A. Reactor WABT = Σ(wi·WABTi), weighted by catalyst mass fraction. Deactivation rate = (current − SOR) / days. Typical deactivation 0.02–0.10 °F/day; typical EOR WABT limit 740–760 °F depending on reactor metallurgy (2.25Cr–1Mo, 321SS). References: API 932–A; API RP 939–C.
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