Page 359 - Chemical process engineering design and economics

338 Chapter 6

Table 6.29 Approximate Tray Pressure Drops for Fractionators

Tray Fractionators 3
psi/tray c
Pressure Pressure Drop
arm

<1.0 0.1
>1.0 0.05

Packed Fractionators b
psi/ft d
vacuum 0.1-0.2
moderate to high 0.4 - 0.75

a) Source: Reference 6.31
b) Source: Reference 6.33
c) To convert to kPa/tray multiply by 6.848.
d) To convert to kPa/m multiply by 22.47.

Table 6.30: Safety Factors for Fractionator Sizing (Source: Reference 55)

Item Safety Factors, %

Small Column Large Column
< 4 f t D > 4 f t D

Packed Height 0-15.0
Trays 20.0 10.0
Diameter 15.0 0

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