Page 43 - Gas Purification 5E

Introduction 33

Table 1-9
Sieve Tray Design Guidelines

Tray Spacing:

Column Diameter, ft c3 3-5 5-6 6-12 1 3-24
Tray Spacing, in. 6-12 18-24 24-30 30-36 35-48
Weir Height:
Should not exceed 15% of tray spacing
Froth regime: 1-4 in. (2 in. is normal)
Spray regime: >I%; in. (W to % in. is normal)
Downcomer Clearance:
Minimum: !4 in. less than weir height (%X in. is normal)

Hole Diameter:
Typical: %A
in.
Plate Thickness:
Plate ThichesdHole Diameter
Hole Diameter, in. Stainless Steel Carbon Steel
%6 0.43 1 .o
% 0.32 0.75
?4 0.22 0.50
H 0.16 0.38
Weir Loading:

Typical: less than 96 gpdft
Pressure Drop:
Maximum, 1.5-3.0 in. of liquid for vacuum
8.0-10.0 in. of liquid for one atm or higher

System Derating Factor:
Factor
Nonfoaming 1 .o
Moderate foaming (e.g., absorbers,
amine and glycol regenerators) 0.85
Heavy foaming (e.g., amine and
glycol absorbers) 0.75
Based on compilation of Barnicki and Davis (1989)