If you are using PVC pipe in a horizontal mounting, as shown in Figure 1, in a home drainage or vent system it is important that the pipe be supported at regular intervals.
Figure 1 - Supported PVC pipe
Table 1 provides a recommended spacing of PVC pipe supports, relative to the pipe diameter, in residential applications.
Note: Always check your local building codes to ensure that the spacing of supports is correct for your jurisdiction.
Different types of pipe supports and hangers are available depending on your mounting requirement and the size of the pipe. Figures 2, 3, 4, 5 are just four of the many PVC pipe support styles available.
Figure 2 - Quick latch PVC pipe support
Figure 3 - Hook PVC pipe hanger
Figure 4 - "J" PVC pipe hanger