Pipe sizing (process)

1^st Step. By knowing the flow rate Q (64 Ton/hr), and by using the recommended velocityV of CO₂ you can calculate the the pipe cross-sectional area A.

A = Q / V

Pipe internal diameter, D = (4 A/3.14)^0.5

2^nd Step. By knowing the total length of pipe, its material (absolute roughness), fluid (specific gravity & kinematic viscosity), fittings, valves and controls, ...etc. you are requested to calculate the Reynold's Number to calculate the friction loss (pressure drop).

3^rd Step. Re calculating the actual flow rate Q to equal to at least the design figure, or increase the pipe diameter to suit with the recommended velocity of CO₂ and minimize the pressure drop.

• For sizing of control valve, please refer to ISA codes & standards (Instrument Society of America), "RP75.06 Control Valve Manifold Designs", for manifold with 2 NPS, the control valve size shall be 1" or 1.1/2", or you can ask the manufacturer of control valve.