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Difference between flat welding flange with neck and butt welding flange with neck Structure 1. Flat welding flange with neck: it is a kind of flange that extends steel pipe Du and pipe fittings into the flange and connects with equipment or pipeline through fillet weld 2. Butt welding flange with neck: flange with neck and pipe transition and butt welding with pipe. Scope of application 1. Flat welding flange with neck: it has a short neck, which improves the strength of the flange and the bearing strength of the flange. So it can be used in higher pressure pipes. 2. Neck butt welding flange: it is suitable for pipelines with large fluctuation of pressure or temperature or pipelines with high temperature, high pressure and low temperature. It is used for the connection of pipelines and valves with PN greater than 2.5MPa. It is also used for pipelines conveying expensive, flammable and explosive media. Weld forms 1. Flat welding flange with neck: the welding seam between pipe and flange with neck is fillet weld. 2. Neck butt welding flange: the welding seam form of neck butt welding flange and pipe is girth weld. 3. Flange connection strength is different: The rigidity and strength of neck butt welding flange are higher than that of flat welding flange, so the pipe connected by neck butt welding flange will not leak easily. Scope of application Flat welding flange with neck can be used for high pressure pipeline, while butt welding flange with neck can be used for high temperature, high pressure and low temperature pipeline and pipeline transporting expensive, flammable and explosive medium.

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