Process Equipment and Plant Design
In case of design of a shell and tube heat exchanger,

All of these
O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres
Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter
Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

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

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

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