Tray Column Design: system_derating_factor_crude_vacuum to downcomer_velocity_low
Distillation and absorption tray column design parameters — sieve, valve, bubble cap, dual-flow, baffle, and chimney tray geometry, hydraulics, flood limits, and turndown ratios; plus system derating factors, downcomer hydraulics, downcomer residence times, typical theoretical stages by separation system, and Murphree tray efficiency ranges
| tray type | category | downcomer aeration factor (dimensionless) | downcomer cl velocity ft s max (ft/s) | downcomer cl velocity ft s min (ft/s) | foaming tendency | system derating factor max (dimensionless) | system derating factor min (dimensionless) | system service | tray spacing in (in) |
|---|---|---|---|---|---|---|---|---|---|
| system_derating_factor_crude_vacuum | system_derating_factor | — | — | — | — | 1 | 0.85 | Crude vacuum towers (moderate-foaming) | — |
| system_derating_factor_hot_carbonate_abs | system_derating_factor | — | — | — | — | 0.85 | 0.85 | Hot carbonate absorbers (moderate-foaming) | — |
| system_derating_factor_sour_water_stripper | system_derating_factor | — | — | — | — | 0.7 | 0.5 | Sour water strippers (heavy-foaming) | — |
| downcomer_aeration_low | downcomer_aeration | 0.6 | — | — | low | — | — | Low-molecular-weight hydrocarbons and alcohols | — |
| downcomer_velocity_low | downcomer_clear_liquid_velocity | — | 0.5 | 0.4 | low | — | — | Low-pressure (<100 psia) light hydrocarbons; stabilizers; air-water simulators | 18 |
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