Distillation Tray Efficiency: weep_point
Distillation tray efficiency data: O'Connell overall column efficiency vs alpha*mu (14 data points, formula Eo=50.3*(alpha*mu)^-0.226), Murphree tray efficiency ranges by tray type and system, weep-point velocities, Fair flooding C-factors (Csb) at multiple tray spacings, downcomer backup limits, tray pressure drop components, turndown ratios, and tray spacing recommendations
| parameter type | record id | notes | system description | tray type | unit | value max | value min | value typical |
|---|---|---|---|---|---|---|---|---|
| weep_point | bubble_cap_tray | Bubble caps have liquid seals that prevent weeping at all normal vapor rates; zero weep is primary advantage; riser height sets minimum liquid level | Bubble cap — essentially no weep | bubble_cap | m/s | 0.05 | 0 | 0 |
| weep_point | sieve_tray_0p5in_holes | Minimum vapor velocity through 0.5-inch (12.5mm) holes at weep point; smaller holes have higher weep velocity due to surface tension effects | Minimum hole velocity at weep point | sieve | m/s | 1.6 | 0.9 | 1.2 |
| weep_point | sieve_tray_1in_holes | Minimum superficial vapor velocity through 1-inch (25mm) holes at weep point; Fsh=0.5; Ah/Aa=0.10; hs=50mm weir; from Kister & Haas correlation. Weeping defined as liquid downflow >0.1% of liquid traffic | Minimum hole velocity at weep point | sieve | m/s | 1.3 | 0.6 | 0.9 |
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