DIN 28184-1
DIN 28184-1 Tubular heat exchangers with two fixed heads - Part 1: Internal tube type 25, triangular 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