Threaded flange is a widely used flange structure type in engineering construction, which has the advantages of convenient on-site installation and no need for welding. Threaded flanges can be used on pipelines that are not allowed to be welded on site, and can be used in flammable, explosive, high altitude, and extremely hazardous situations. For example, air conditioning water systems can be used safely.
However, it is recommended not to use threaded flanges when the pipeline temperature changes sharply or when the temperature is above 260 ℃ but below -45 ℃ to avoid leakage.
The basic shape of socket welding flanges is the same as that of neck flat welding flanges. There is a socket in the inner hole of the flange, and the pipe is inserted into the socket and welded. Weld the weld seam ring on the back of the flange. The gap between the socket flange and the grass groove is prone to corrosion, and corrosion can be avoided if the internal weld is installed. The fatigue strength of the socket flange welded on the inner and outer sides is 5% higher than that of the flat welded flange, and the static strength is the same. When using this socket end flange, its inner diameter must match the inner diameter of the pipeline. Socket flanges are only suitable for pipes with a nominal diameter of 50 or smaller.
Socket welding is usually used for small pipes with a diameter less than DN40 and is more economical. Socket welding is the process of first inserting the socket and then welding the connection. Socket welding usually involves inserting pipes into flanges and welding them,
The difference between socket welded flanges and threaded flanges
1. Different connection forms: Socket welding flange is a flange that is welded to a steel pipe at one end and bolted to the other end. However, threaded flange is a non welded flange that processes the inner hole of the flange into a pipe thread and is connected to a threaded pipe.
2. Socket flanges have sealing surfaces such as raised face (RF), raised face (MFM), grooved face (TG), and ring joint face (RJ), but threaded flanges do not. Threaded flanges have the characteristics of convenient installation and maintenance compared to socket welded flanges, and can be used on some pipelines that are not allowed to be welded on site. Alloy steel flanges have sufficient strength, but are not easy to weld or have poor welding performance. Threaded flanges can also be chosen
When the pipeline temperature changes sharply or the temperature is above 260 ° C but below -45 ° C, the use of threaded flanges is prone to leakage. It is recommended to use socket welding method
Post time: Apr-06-2023
