The slip on flange is usually installed in the middle of the piping,sometimes, The way it links to the pipe is to insert the pipe into flange hole appropriately and weld them,this type of the flange has more type of the sealing face,it has RF,FM,FF and RTJ.the type of the flange also has casting and forging,the slip on flange has best marketin all of the flange.
Details of Slip On flange
1. Slip On flange 2. Filled weld outside
3. Filled weld inside 4. Pipe
Slip On flange
The calculated strength from a Slip On flange under internal pressure is of the order of two-thirds that of Welding Neck flanges, and their life under fatigue is about one-third that of the latter.
The connection with the pipe is done with 2 fillet welds, as well at the outside as also at the inside of the flange.
The X measure on the image, are approximately:
Wall thickness of pipe + 3 mm.
This space is necessary, to do not damage the flange face, during the welding process.
A disadvantage of the flange is, that principle always firstly a pipe must be welded and then just a fitting. A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange.