European flanges and American flanges
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Are European flanges divided into A and B types, while American flanges are not divided into such categories?
This post was last edited by lovepds on 2017-1-10 16:56. Yes. The European system is divided into Series A and B; this refers to the outer diameter of the pipe fittings at the welding end. Series A is the internationally standard series (commonly known as imperial pipes), while Series B is the series used in China (commonly known as metric pipes). What we often refer to are pipes with larger outer diameters (HG20553 Series 1a) and those with smaller outer diameters (HG20553 Series II). For the American series, there is only one diameter option for the flanged end fittings, so there are no A or B series. However, for flange faces with a DN greater than 600, they are divided into A/B series, based on differences in the flange face design. Standards such as HG/T20634 and ASME B16.47 classify flanges into A and B series, and the size of the flange face, as well as the number and specifications of the bolt holes, vary between these series.
Flanges for the American series, those over 24", are also divided into Series A and Series B. For details, refer to ASME B16.47.
This post was last edited by lovepds on 2017-1-18 at 17:00. Yes, the A and B series in the American system represent different variations of flange designs. Only those with ＞DN600 are available. However, it can also be seen that according to the execution standard SH/T3406, there is no distinction between Series A and Series B; flange faces of Series B are used uniformly. HG/T20623 and ASME B16.47 are divided into Series A and Series B.
So, one needs to be rigorous, especially those in technical fields. :handshake:lol
I suggest you revise and improve the content for the 2nd floor (the best floor) to avoid misleading others. :handshake
The European system is divided into Series A and B; this refers to the outer diameter of the pipe fittings at the welding end. Series A is the internationally standard series (commonly known as imperial pipes), while Series B is the series used in China (commonly known as metric pipes). What we often refer to are pipes with larger outer diameters (HG20553 Series 1a) and those with smaller outer diameters (HG20553 Series II). For the American series, there is only one diameter option for the flanged end fittings, so there are no A or B series. However, for flange faces with a pipe nominal diameter exceeding DN600, they are also divided into A/B series.