Bundle diameter:
A bundle in the heat exchanger comprises of tubes, baffles, tube sheets, tie rods, spacers, support plates, sealing strips, sliding strips, seal rods etc., 
The external diameter of the bundle is known as the bundle diameter.
Where,
            Ao - Provisional area of the exchanger in in2 (from eq: 5)
            Pt - Tube pitch in inches
            do - Outer diameter of the tube in inches (value from table 6)
CTP is the tube count constant which accounts for the incomplete coverage of the shell diameter by the tube due to necessary clearances between the shell and the outer tube circle.
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