As you are drawing your riser diagrams, you should keep in mind the fittings that will be used for changes in direction. There are three ways to change direction. Your pipe can go from horizontal to vertical, from vertical to horizontal, or from horizontal to horizontal. The fittings used in a drainage system to make these changes are regulated by the rules of the local plumbing code. As a rule-of-thumb, you can refer to Figure 4.25 for the common use and acceptance of fittings when changing directions. Again, always confirm local code requirements before committing to a job.
|
Type of fitting |
Horizontal to vertical |
Vertical to horizontal |
Horizontal to horizontal |
|
Sixteenth bend |
yes |
yes |
yes |
|
Eighth bend |
yes |
yes |
yes |
|
Sixth bend |
yes |
yes |
yes |
|
Quarter bend |
yes |
no |
no |
|
Short sweep |
yes |
yes |
no |
|
Long sweep |
yes |
yes |
yes |
|
Sanitary tee |
yes |
no |
no |
|
Wye |
yes |
yes |
yes |
|
Combination wye |
yes |
yes |
yes |
|
and eighth bend |
