Pocket Guide to Flan..

Figure 2-17. Flat type and ridge type welding rings. (Courtesy of Tube Turns Tech-
nologies, Inc.)
The backup rings are inserted in the adjoining ends of
pipes that are to be buttwelded. The rings prevent spat-
ter and metal icicles from forming inside the pipe. The
ring becomes a permanent part of the piping system.
Figure 2-17 shows two other type backing rings--the flat
and ridge types.
Branch Olet Connections
There are many reputable manufacturers of Olet fit-
tings used for branch connections. For description and
illustration purposes, the Bonney Forge fittings are de-
scribed here, along with their registered trade names for
the fittings.
Interchangeability
Table 2-2 shows the interchangeability and size con-
solidation of the Olet fittings. The correct descriptions of
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