Neck flat welding flange, German standard flange, European standard flange, national standard flange, American standard flat flange, Japanese standard flange

The neck flat welding flange, like the plate flat welding flange, is a flange in which steel pipes, pipe fittings, etc. are extended into the flange and connected to equipment or pipelines through fillet welds.
Sealed form
The sealing surface forms of neck flat welding flange are:
Raised surface (RF), concave surface (FM), convex surface (M), tenon surface (T), groove surface (G), full plane (FF).
The diameter range of neck flat welding flange is: DN10~DN600.
Advantages: The flat welding flange with neck is also a flat welding flange, because it has a short neck, which increases the strength of the flange and improves the load-bearing strength of the flange.So it can be used on higher pressure pipelines.
Disadvantages: It is more expensive than plate-type flat welding flanges and is more likely to be bumped during transportation due to its shape.
Common domestic manufacturing standards include:
national standards of People's Republic of China;
GB/T 9116-2010 Hubbed slip-on-welding steel pipe flanges (Hubbed slip-on-welding steel pipe flanges);
Chemical industry standards of the People's Republic of China;
HG/T20592~20635-2009 Medium PN series (European system);
HG/T20592~20635-2009 Class series (American system).