Can any master explain the difference between neck butt welding flange and neck flat welding flange?
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Can any master explain the difference between neck butt welding flange and neck flat welding flange?
Let’s read the standards yourself first. Neck butt welding flange, which is a high-pressure flange, has the same outer diameter as the pipe, butt welding and penetration welding ； The neck flat welding flange is a low and medium pressure flange with a trial range of 2.5MPa~4.0MPa. The flat welding flange processing interface is slightly larger than the outer diameter of the pipe, and the pipe is inserted inside and connected to the equipment or pipe with a single-sided welding corner seam.
This post was last edited by xlxuiin on 2017-1-5 12:50. The difference in structure is shown in the figure above. The main difference is that the butt weld between the former and the pipe during installation is a fillet weld, while the butt weld between the latter and the pipe is a butt weld. Different weld forms have different pressure-bearing capabilities, so the latter is generally used in high-temperature, high-pressure, and high-risk media situations.
The difference between WN and SW； If you know how to weld, it will be easy to understand.
Agree with the third floor, the explanation is very thorough.
This post was last edited by Liu Qinqin on 2017-1-6 14:13 on the third floor. It was very detailed. In addition, flat welding flanges are not allowed to be directly welded to tees, elbows and other pipe fittings, and straight pipe sections need to be added.
1. Different flange shapes 2. Different welding methods 3. Different operating conditions 4. Different pressure ranges