Page 177 - Trenchless Technology Piping Installation and Inspection

Pipe and Pipe Installation Considerations 143

and steel, capable of handling up to 500 psi. There are two
types of PCCP-lined cylinder pipe and embedded cylinder
pipe. A welded cylinder core with joint rings attached at both
ends exists in both types. After curing, the pipes are wrapped
with hard-drawn wire under high tensile stress, and then
coated with cement slurry. Available diameters range from
24 to 144 in. AWWA C301 is the governing standard.
4. Reinforced concrete cylinder pipe (RCCP): This is similar to
PCCP, but uses reinforcing cages in place of the hard-drawn
wire. Standard AWWA C300 requires that the pipe be designed
to withstand both internal and external pressure. Available
diameters range from 24 to 144 in. Pressure applications are
its main use.
5. Bar-wrapped steel-cylinder concrete pipe: Also known as preten-
sioned concrete cylinder pipe, the steel cylinder is internally
lined with a cement mortar lining. Once cured, a steel rod,
under tension, is wrapped around the cylinder. Another
cement mortar lining is then placed on the wrapped cylinder.
Smaller-diameter pipes are considered rigid, whereas larger
diameters behave as flexible conduits. AWWA C303 is the
standard governing its manufacture and testing. Like the pre-
vious two types, bar-wrapped concrete pipe is also used in
pressure applications.
6. Polymer concrete pipe (PCP): Polymer concrete originated more
than 20 years ago in Germany. This type of pipe provides a
corrosion-resistant concrete as needed for piping applications
that require high concrete compressive strength and resis-
tance to corrosive chemicals. These pipes are made by mixing
a high-strength, thermosetting resin with oven-dried aggre-
gate to form a type of concrete. The resin within the mix pro-
vides for bonding the aggregate much like portland cement
does in traditional concrete pipes. Figure 4.21 illustrates typi-
cal sections of polymer concrete pipes.

FIGURE 4.21 Polymer concrete pipe.