How Does A Slip On Flange Work?

Slip on flange are designed to fit over pipes and are slightly larger inside than pipe. They connect to the pipe via a fillet weld at the top and bottom of the flange. In addition, it is used to insert the pipe into the flange’s inner hole. It is because the flange’s inner diameter is slightly larger than the pipe’s outer diameter. Hence, the pipe and flange can be joined by lap welding at the top and bottom of the flange.

Accordingly, it lacks a weld bevel, hence it is a simple and excellent alternative to a weld neck, allowing the pipe to be adjusted in length relative to the flange’s position. Other than that, the flange’s bore will provide plenty of room for the matching pipe. By that, it provides enough working space for the welder and fabricator to connect.

Besides that, it is very common in low-pressure applications. Most of the flanges would have a hub that looks dimensionally similar to a raised face. If space is tight and also the application enables for a “ring style” slip on, it could be furnished without a hub. Even though the hub style seems to be more usual when referring to a slip on, a ring style slip on without a hub is still considered a slip on flange. In order to have a better connection, the flanges in higher pressure classes are frequently made with the height of a lap joint.