For the flange, there are two series of ASTM and EN, the same series can be used for matching:
1.National standard (GB / t9112 ~ 9124-2000), EN standard flange and ASTM flange are adopted at the same time.
2.Chemical industry standards (hg20592 ~ 20635-1997, hg20592 ~ 20635-2009), adopting EN standard flange and ASTM standard flange
3.Mechanical industry standard (JB / T74 ~ 86.2-1994) adopts EN standard flange, without neck flat welding flange
According to the petrochemical industry standard (sh3406-1996), ASTM standard flange is adopted, and the large diameter butt welding flange above n600mm is adopted.
ANSI ASME B16.5 ASTM A105 RF SO flanges slip on flanges
There are two series of wall thickness of pipes and fittings:
1. IA series pipe with EN standard a series flange
2. IB series pipe is equipped with ASTM standard flange (IA series and IB series can be considered as the same)
3. II Series corresponds to B series flange of EN standard. The source of EN standard is German standard. Before German standard, there were two kinds of pipe AB, but now EN standard EN1092 only has one kind of British pipe a, so EN standard has no B series.
4. EN standard a series flange can only be matched with IA series pipe. Ia series IB series can be considered the same).
5. ASTM standard flange can only be matched with IB series pipe. (IA series and IB series can be considered as the same) the sizes of DN65 and DN 125 of ASTM Standard are different from those of a pipe, so attention should be paid to thread processing.
EN1092 Q235 FF blind flanges
6. EN standard B series flange can only be matched with II series pipe.
7. Pipes are divided into ia IB series, i.e. large pipes, i.e. a series, British pipes; and II series, i.e. small pipes, i.e. B series, metric pipes.
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