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

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

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Process Equipment and Plant Design
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Molar latent heat of the two components are equal
Heat of mixing of normal liquid is assumed to be zero
Reflux is not a saturated liquid
Sensible heat changes for vapour & liquid are negligibly small

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