Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Plain carbon steel and cast iron parts are used
Wall thickness is > 30 mm
Both B & C
Material of construction is high alloy steel

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

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

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