All you need to know about slip on flanges

As the name suggests slip on pipe flanges can easily get slipped all over the pipe’s surface. These are generally machined with an inner diameter that is slightly larger than the pipe’s outer diameter. Slip on pipe flanges can get secured to the pipe with a fillet weld at the bottom or top surface of slip on flanges. Typically slip on pipe flanges can be found in the market having a flat or a raised face. 

Being bored a slip on flange can easily slip on the pipe so the pipe’s end remains within the flange of fraction of an inch from the flange face. The pipe’s end has been cut square. Flange bolt holes are aligned and flange face is squared to the pipe. Then a filled weld can be run around that end of pipe schedule to fuse it within the bore of flange. Another fillet weld can be run around the back end of flange hub fusing it to the pipe’s outer part. Slip on pipe fittings are the most common types of welding flanges. Prior to the making of final full fillet welds, temporary welds are made until the position and alignment gets certain. Being much loose they can easily slip on over the pipe and clamp onto a rolled or flanged over pipe edge. 

In case of raised face slip on flanges, the standard height must be 1/16” for slip on pipe flanges within 400#. For slip on pipe flanges, the standard height is 1/16” for slip on pipe flanges within 400#. Slip on pipe fittings of 400# and more, the average height for raised face is 1/4”.