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25) A tube bundle consists of low-fin tubes containing 26 fins per inch laid out on a 1-in. triangular pitch. The fins have an average height of 0.049in. and an average thickness of 0.013in. The diameter of the root tube is 0.652 in. Calculate the gap and equivalent diameter to be used in the Simplified Delaware Method. Ans. 0.313 and 0.908in. 25) A tube bundle consists of low-fin tubes containing 26 fins per inch laid out on a 1-in. triangular pitch. The fins have an average height of 0.049in. and an average thickness of 0.013in. The diameter of the root tube is 0.652 in. Calculate the gap and equivalent diameter to be used in the Simplified Delaware Method. Ans. 0.313 and 0.908in