Plumbing Connection 4-2015

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PLUMBING CONNECTION SUMMER 2015 35
performance based outcome led to
the engagement of HWU, who are
acknowledged as a world leader in
drainage research,” Brad explains.
“They were keen to be involved in a
“live” project and understood the basic
matter at hand – water conservation
impacting on the carrying capacity
of drainage. HWU developed flow and
time profiles for all fixtures and fittings
and loaded this information into their
Drain Net software simulation model
developed specifically for the project.
HWU used statistical/probability
numerical simulation over a three
hour window of 0600 to 0900, where
every fixture and fitting in all of the
apartments was used, deriving a
maximum flow rate in the drainage
network adequate for the installation
of a 150mm diameter drain rather than
a 225mm diameter drain as prescribed
by the relevant Australian Standards.
As you can imagine, the fixture and
fitting manufacturer would also have
to back up their products’ claims
and have the ability to prove that
their products could stand up to the
kind of treatment being asked of the
alternative solution.
“The local authorities required
a written warranty from Studor to
state that the performance based
outcome would have no detrimental
effect on their air admittance valves
and positive air pressure attenuators
installed within the sanitary plumbing
system and that Studor were willing
to warrant their products within this
project. Mr Steven White from Studor
was also consulted and was a key
stakeholder. He had no hesitation in
providing the warranties given that
HWU were involved in the verification
of the outcome,” Brad says.
Sellick Consultants informed ABCB
of its proposal to which they advised
Sellick that the matter was something
the local regulator had to consider
but they would be interested in
understanding our proposal and the
outcome. It is important to remember
that the ABCB is merely a facilitator
and not the regulator.
“We did pass on our final engineering
brief to them for their information and
this included the paper prepared by
HWU to validate our claims.”
Sellick Consultants has been
granted an Australian Innovation
Patent by the Australian patent office.
The patent takes into account the
impact of WELS ratings of fixtures and
fittings and adjusts drainage/water
loadings accordingly to suit the water
conservation measures adopted
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