SO flange, also known as slip-on flange with neck, is a type of flange commonly used in pipeline connection. Its characteristic is that the appearance is similar to that of slip-on flange, and the welding part is that the pipe is inserted into the flange for welding. This flange is generally used for low and medium pressure pipelines and is suitable for pipeline systems with lower pressure. The English name of SO flange is SLIP ON FLANGE. This flange has a higher neck, which improves the rigidity and bearing capacity of the flange compared to other types of flanges. During installation, SO flanges are connected by bolts and sealed with gaskets to ensure the reliability of the connection.

SO flanges can be made of a variety of materials, including carbon steel, low alloy steel, stainless steel, etc. The choice of these materials depends on the specific application requirements and environmental conditions. For example, in situations where it is necessary to withstand higher pressures and temperatures, stainless steel or other alloy materials may be selected to ensure the performance and durability of the flange.

In general, SO flanges are an economical and practical pipeline connection solution, which is widely used in construction, light and heavy industries, plumbing, electricity and other fields. They are favored for their simple structure, easy installation and good sealing performance.