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

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used
Liquor is inside the tube while the steam is outside the tube
All of these
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

More in case of triangular pitch as compared to the square pitch tube layout
Not less than one-fourth of the tube diameter or 3/16"
Equal to the tube diameter
More than the tube diameter

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Process Equipment and Plant Design
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Straight flange section and corner torus section
Corner torus section and central dished section
Central dished section and straight flange section
Central dished section and corner torus section

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