Page 186 - Trenchless Technology Piping Installation and Inspection

Pipe and Pipe Installation Considerations 151

Pressure Available
Standards Nonpressure Standards Diameters (in.)
ASTM C-1208: Standard
Specification for Vitrified Clay
NA Pipe and Joints for Use in 4–42
Microtunneling, Sliplining, Pipe
Bursting, and Tunnels
TABLE 4.8 Product Standards

Joint Types
Also known as pretensioned concrete cylinder pipe. The evolution of
joints in clay pipe is a shining example of the results of research,
development and innovation within the piping industry. From its
earliest days of having no joints to its present-day joint types, clay
pipes have seen several iterations over the course of a century. To
arrive at its present-day compression joints, clay pipes went from
having no joints to field-applied cement joints to field-applied bitu-
mastic joints to factory-installed cement mortar or bitumastic joints,
and finally to the compression seal joint. One manufacturer even
makes a molded polyurethane joint attached to the spigot end and a
PVC collar, which is shrunk and rapidly fitted and sealed to the socket
end of rigid vitrified clay pipe barrel as shown in Figure 4.23.
The jointing system in ASTM C1208 clay jacking pipe is a preci-
sion ground recessed joint, ensuring dimensional accuracy and high
end-bearing capacity. A stainless steel sleeve with elastomeric seals is

FIGURE 4.23 Innovative joints in clay pipe. (Source: Can Clay Corporation.)