Tubesheet layout and sizing calc MS 03/01/2014 [email protected] select pitch square tri/sq choose grid type tubes nr 23 # choose nr of tubes center a a/b/c choose center position pitch center r/A min # tubes inside square a 2.82843 25 b 2.69258 26 c 2.54951 24 triangle a 2.64575 31 b 3.50000 48 c 3.51188 48 Test Case Dia tube, d mm 88.9 A/d - 1.25 ~ 1.25-1.5 Pitch, A mm 111.125 A-d mm 22.225 r/A - 2.8284 Dia red circle mm 628.6 Distance to wall, w mm 11.1125 commonly ~ (A-d)/2 Dia black circle mm 739.7 NOTES 1) This calc makes use of iterations. Make sure iterations are enabled in File/Options/Formulas/ 2) The current maximum tubes is about 5^3. This can be extended if required, but the calc will b 3) This calc does not make use of macros. 4) Change the marker size (blue dots) in the graph when using a large nr of tubes. 5) If the calc goes off, you may be able to get it back on track by playing with the iteration contro 6) If the red circle appears oval, its because the axis have a different scale. A d w A-d