Building Design and Construction Handbook - Merritt - Ventech!

WATER-SUPPLY, SPRINKLER, AND WASTEWATER SYSTEMS 14.37
FIGURE 14.9 Wastewater-removal system for a multistory building. (Reprinted with permission
from F. S. Merritt, ‘‘Building Engineering and Systems Design,’’ Van Nostrand Reinhold
Company, New York.)
which is generally provided with a separate vent. Between the building trap and
public sewer, or other main sewer pipe, is the building sewer. The building sewer
is outside the building structure, while the building trap is just inside or outside of
the building foundation wall.
Where the building drain is below the level of the public sewer line, some
arrangement for lifting the wastewater to the proper level must be provided. This
can be done by allowing the building drain to empty into a suitably sized sump
pit. The wastewater is discharged from the sump pit to the public sewer by a
pneumatic ejector or motor-driven sewage ejector pump.
Pipe Supports. Pipes of wastewater-removal systems should be supported and
braced in the same way as pipes of water-supply systems (Art. 14.8). Vertical pipes
generally should be supported at every floor. Horizontal pipes should be supported
at intervals not exceeding the following: cast-iron soil pipe, 5 ft and behind every