DIN 28184-2
DIN 28184-2 Tubular heat exchangers with two fixed heads - Part 2: Internal tube type 25, square tube pitch 32 - Number and pattern of tubes
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2009
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2009