Process Equipment and Plant Design
The value of fouling factor depends upon the

All of these
Velocity of process fluid containing suspended solids
Suspended solids in the fluid
Characteristic of process fluid

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

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