What is a good relation to use for calculating tube bundle diameters?

What is a good relation to use for calculating tube bundle diameters?
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Answer :

The following are equations for one tube pass bundle diameter when the tube count is known or  desired: 30 Deg. DS = 1.052 x pitch x SQRT(count) + tube O.D. 90 Deg. DS = 1.13 x pitch x SQRT(count) +  tube O.D. Where: Count = Number of tubes DS = Bundle diameter in inches Pitch = Tube spacing in  inches
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