Process Equipment and Plant Design
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

300 and 500
45 and 75
180 and 300
5 and 10

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Process Equipment and Plant Design
In a bag filter, the pressure drop increases directly as the

Viscosity of the gas and inversely as density of the gas
Density of the gas, but is independent of the viscosity of the gas
Density of the gas and inversely as viscosity of the gas
None of these

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