Patent ID: 7988202

Claim:
A branch connection stub for connection to a main pipe having an annular wall, wherein the stub presents an outside surface of revolution and includes at least one axial internal passage, a rear segment with a fastener flange, an intermediate segment, and a front segment having a free end presenting a circular outline suitable for mounting by plane welding around a circular opening in the annular wall of the main pipe, said intermediate segment comprising a first annular wall extending radially outwards from the rear segment, a second wall that is circularly cylindrical extending the first annular wall, and a third wall forming an annular taper from the second wall of the intermediate segment towards the front segment, so that said first annular wall and said third wall form between them an acute angle towards the at least one axial internal passage, and wherein said front segment comprises a cylindrical wall adjacent the third wall of the intermediate segment and an annular wall extending radially from the cylindrical wall, an outside edge thereof defining the free end of the branch connection stub that is mounted in the circular opening in the annular wall of the main pipe.