Gravity sewer piping consists of a large network of underground
mains that rely on gravity to convey storm water and wastewater
from homes and businesses to a central treatment plant. In
route, the gravity must allow a self-cleansing flow velocity so
that no particles accumulate in the line. In areas where such a
flow cannot be maintained, pumps must be installed to generate
necessary flow through lines that are called force mains.
AMERICAN ductile iron pipe has long been a popular choice for
gravity sewer systems, which typically consist of a large sewer
main running along a major highway that is connected to smaller
lines in neighborhoods and even smaller lines leading from
individual residences and businesses. All these lines run from
manhole to manhole and are installed at a steady, even slope.
When you see a manhole cover that says “Sanitary Sewer,” there’s
a line like this underneath. Ductile iron’s superior strength
makes it ideal for deep trenches and installations in areas of
high water table, and th