Shell diameter:
Ds = Db+BDC-9

            Db - Bundle diameter in inches (from eq: 8)
            BDC - Bundle diameter clearance in inches (from fig. 5)
            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.
Bundle diameter clearance (BDC):
Bundle diameter clearance is referred to as the gap between the bundle diameter and the shell diameter.
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