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

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

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Process Equipment and Plant Design
For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft³/sec.ρ = fluid density, lb/ft³ μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)

Di, opt = 3.9 Q0.45 . μ0.95
Di, opt = 3 Q0.36 . μ0.88
Di, opt = 3.9 Q0.45 ρ0.13
Di, opt = 4.7 Q0.36 . μ3.2ρ0.13

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

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