47
FEATURES
Things down
the drain (Part 2)
The drainage piping must
be indicated on all the
floors and sections of
plans, and the elevations
with all the piping and
elements, including sizes,
must be indicated.
Continuing the feature from the April issue, and having
spoken with several plumbers in the industry, we aim to
answer these questions around drainage.
By Benjamin Brits
Drainage is something that most people do not even
think about yet it is vital, as drainage allows the
removal of waste and wastewater, creating a safer
and healthier environment for us to live in.
WHAT ARE THE CORRECT STANDARDS IN TERMS
OF VENTS?
The answer in this case can also be found in
SANS10400-P. The following are some important aspects
that relate to the DTSR:
• There must be a 100mm-diameter open vent pipe
www.plumbingafrica.co.za
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at the highest, furthest point of the drainage system
of a building.
All branch drains longer than 6m shall have a
vent pipe of at least 50mm in diameter. This is a
minimum requirement.
The vent pipes shall rise beyond the roof and above
all windows as detailed in SANS10400-P.
It is very important that a vent valve shall also be
situated above the window and above the roof.
A two-way valve shall not be installed inside a
building.
May 2019 Volume 25 I Number 3