The choice of flanges for the European system and the American system
Flange selection is mainly to see consistency, Europe or the United States there is no strict requirements, mainly taking into account the ease of use, unity.
The two standard flanges are HG20592 and HG20615, and domestic flanges are generally used in the European system. If exports are American system flanges
Chemical flange specification must specify flange specification numberIn our country, the important use is chemical flange specification HG. As a result of the two set system, namely the European system and the American system. The flange specification number is different. As these two sets of system flange size is different, so the same as the chemical flange specifications HG, but it will not match, only to specify the chemical flange specifications, in order to ensure that each other correctly.The usability of flange under different pressure levels is discussedIf you use the different specifications of each country, you must also specify the flange specifications. In practice, through careful comparison, each standard system is different, such as chemical flange, European system, flange in DN less than 100, in the same DN, its flange diameter, screw number and size the same. Therefore, it can be used for automatic control specialty. If the project to PN=1.6Mpa, and the instrument marked is PN=2.0Mpa, if it is chemical flange HG20592-97 European system, only pressure grade allowed, it can match the whole.Chemical flanges specification American system CLASS 150 and CLASS 300 have no versatilityAfter careful comparison, the chemical flange specification American system 5.0Mpa (ie CLASS 150 and CLASS 300) below the pressure level is not universal, and this is different from the European system, use should pay attention to. This data is provided free of charge by Jiangsu Jinhu Ott Automation Instrument Factory
