Introduction to Cast Iron Sovent®
Systems
The Sovent® system is an engineered single stack
drainage system that offers the industry its first major change in
many years. It offers a different concept of waste and venting by
slowing the velocity of the liquids and solids through a series of
aerator fittings and double offsets. Before entering the building
drain a deaerator fitting is placed at the base of the stack to
minimize solid build up and slow the drainage before entering the
building drain. This fitting is designed to have a pressure relief
line which is to extend back (10) ten pipe diameters and tied into the
building drain. This eliminates any back pressure problems. As in all
industries, especially the plumbing industry, something new can be
very hard to accept. Sovent® on the other hand offers an exciting new
approach to the design and installation of sanitary plumbing systems
with obvious savings in labor, material, and construction.

How It Performs
The cast iron Sovent® is a specially
designed single stack soil and waste system using aerator fittings at
each floor were soil and waste enter the stack and deaerator fittings
at the base of the stack. By incorporating these fittings into a
single multi-story stack the volume of drainage is greatly increased
over the standard two stack waste & vent system.
The aerator fitting is designed with an
offset chamber to slow the soil and waste matter at each floor, never
allowing it to reach its terminal velocity thus eliminating back
pressure.
The deaerator fitting at the base of
the stack is designed to eliminate any build up of solids and slow the
contents before the change in direction. At the base of the stack the
pressure relief line eliminates any pressure build up which might
occur. This fitting is designed to assure a smooth drainage flow from
the vertical stack into the horizontal drain. The loop in the pressure
relief line accommodates "hydraulic jump" that occurs at the
base of the stack.
For more information on Sovent® please
refer to our online design manual number 101/o located in the
Downloads portion of our website.