Constants K 1 and K 2 are given in Table 16.
In calculating V o , assume ratio hole to bubble area (A o /A B ) is 12 %.
Total Tray, ΔP Á ht
Total tray ΔP ¼ h cl þ h ed
(10)
where:
h cl = height of clear liquid on tray in inches of hot liquid
h ed = effective dry pressure drop in inches of hot liquid
Head Loss Under Downcomer, h ud
h ud ¼ 0:06 GPM Ä cL i À N p
À
Á
Â
à 2
(11)
where:
h ud = head loss under downcomer in inches of hot liquid
c = constant = 1.5
L i = length of inlet weir in inches
Table 14 Valve thickness
in inches
Gage
t m
20
0.037
18
0.050
16
0.060
14
0.074
12
0.104
10
0.134
8
0.250
Table 15 Valve metal
densities (in lb/cuft)
Metal
Density, ρ m
C.S.
480
S.S.
510
Nickel
553
Monel
550
Titanium
283
Hastelloy
560
Aluminum
168
Copper
560
Lead
708
Table 16 Values of K 1
and K 2
Type of unit
K 1
K 2
Deck thickness ins
0.074
0.104
0.134
0.25
Normal valves
0.2
1.05
0.92
0.82
0.58
Vacuum valves
0.1
0.50
0.39
0.38
–
222
D.S.J. Jones