Figure 3-16.Caulking cast-iron joints.
the center of the hub, as shown in view A, figure 3-16.
As shown in view B, figure 3-16, use packing
(yarning) irons (1 and 2, fig. 3-17), and pack a layer of
spun or twisted oakum into the hub completely around
the joint. Repeat with more layers until the hub is
packed to about 1 inch from the top. Compress the
oakum thoroughly to make a solid bed for the lead and
to prevent leakage of the joint. With a plumbers ladle
(2, fig. 3-15), pour melted lead carefully into the joint
until it rises slightly above the top rim of the hub (fig.
3-18). Dip up enough lead with the ladle to make the
joint in one pouring. Allow a minute or two for the lead
To avoid using a wet ladle to dip the hot lead,
you must heat the ladle. Remember, moisture
causes hot lead to spatter out of the melting
pot. Always wear protective clothing, face
shield, and gloves when working with hot
Figure 3-17.Packing and caulking irons.