Process Equipment and Plant Design
Ratio of tube length to shell diameter for a shell and tube heat exchanger is

Both B & C
4 : 1 to 8 : 1 for liquid-liquid exchanger
< 4 : 1 for gas-gas exchangers
8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers

ANSWER DOWNLOAD EXAMIANS APP

Process Equipment and Plant Design
Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)

Η = 24.6 (Δp/μ)
Η = 17 - 61.1 log μ
Η = 0.25 log μ - 1.67
Η = 1.66 - 0.25 log μ

ANSWER DOWNLOAD EXAMIANS APP