Page 287 - Buried Pipe Design
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258 Chapter Five
Figure 5.4 Combined loading curves for 24-in transmission pipe. (Reprinted, by permis-
sion, from ANSI/AWWA C401, 12 American Water Works Association, 1986.)
removed. This mixture is then machine-extruded in the form of pipe.
This fresh extruded pipe contains about 18 percent water and is called
greenware. Greenware is placed in drying rooms to reduce the mois-
ture content to about 3 percent. The pipe is then taken to the kilns and
preheated to approximately 400°F to drive off the remaining moisture.
The pipe travels slowly through the kiln, reaching a temperature near
2000°F where vitrification takes place.
