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TUBE SPACE FOR CONSTRUCTION OF BOILERS The space occupied by the tubes is equal to their. volumes. The volume of one tube is its external area multiplied by the length in inches. The total volume, in cubic inches, is the above result multiplied by the number of tubes. This is reduced to cubic feet by dividing by 1728. The space occupied by the tubes will be (71 x 7.07 x 16 x 12)/1728 = 55.77 cubic feet.