Figure 5-10.Carbon packing gland.
Carbon packing rings (fig. 5-10) restrict
the passage of steam along the shaft in
much the same manner as labyrinth packing
strips. Carbon packing rings mount around
the shaft and are held in place by springs.
Three or four carbon rings are usually used
in each gland. Each ring fits into a separate
compartment of the gland housing and consists
of two, three,
or four segments that are
butt-jointed to each other. A garter spring
is used to hold these segments together. The use
of keepers (lugs or stop pins) prevent the
rotation of the carbon rings when the shaft
rotates. The outer carbon ring compartment
connects to a drain line.
In this chapter, you have learned about the
components inside a steam turbine casing. You
have also learned the basics of how the steam
turbine works. For more information on steam
turbines, refer to Machinists Mate 3 & 2,
NAVEDTRA 10524-F1, chapter 2.