Socket Welding Flanges:
The socket welding flange is similar to a slip-on flange except it has a bore and
a counter bore dimension. The counter bore is slightly lager than the O.D. of the
matching pipe, allowing the pipe to be inserted into the flange similar to a
slip-on flange. The diameter of the smaller bore is the same as the I.D. of the
matching pipe. A restriction is built into the bottom of the bore which sets as
a shoulder for the pipe to rest on. This eliminates any restriction in flow when
using a socket welding flange.