Plumbing Connection 4-2015

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STUDY DEMONSTRATES STUDOR
SYSTEM IS THE MOST ECONOMICAL
ACROSS ALL BUILDING HEIGHTS
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The Studor System also offers additional benefits to just
cost savings. The reduction in duct size required increases
the habitable space available and can significantly add
not only to the floor space but also building rents or sales
value, hence improving the return on investment of the new
development.
In addition, reduced pipework requirements offer a
sustainable drainage solution, site safety is improved with
a reduced requirement for working at height, whilst the
elimination of roof venting pipes and penetrations reduces
thermal heat loss and enhances the aesthetic appearance of
the building.
A report providing more detail about the study is available
on request. To obtain a copy please visit
or contact Studor via .
T he study compared the supply and installation costs
of the Studor System against the other two main
types of high rise sewer stack systems in use across
Australia and New Zealand: a Reduced Velocity Aerator
Stack System (RVASS) and a traditional system modified
with AAVs, also referred to as a Fully Vented Modified System
(FVM).
Whilst a previous comparison in 2011, based on an entire
building project over 22 floors, demonstrated that Studor
was the most cost effective for that size project, it had raised
the question of how would these stack systems compare
over shorter and taller building designs.
The new comparison compared the same three single
stack systems over several building heights. Instead of a
whole building, this time the cost comparison was based on
a single stack using the three systems: aerator fittings, relief
vents and Studor P.A.P.A.s and AAVs, covering 8, 40, 70 and
90 floors.
Straight stacks were used (no rollovers or offsets that
could make one system cheaper or dearer) and they all had
the same fixture unit loading to ensure that they were all
sized based on the exact same criteria, as well as eliminating
the cost of branches as these can vary from building to
building or floor to floor. A straight stack with a set loading
will always be the same regardless of other factors.
An independent hydraulics consultant was commissioned
to provide the design and bill of quantities. A separate
consultant then provided a cost estimation for the bill of
quantities with the aim of comparing the three systems; the
Studor System relative to an ordinary FVM and to two RVASS;
one using 169mm and the other using 110mm pipework.
The results demonstrated that the Studor System is the
most economical of the three drainage systems. The extent
of savings are typically over 40% against the RVASS systems
and over 20% against the FVM system. Whilst the amount
of saving differed depending on the building heights, Studor
was the most cost effective for the four height options that
were considered.
AN INDEPENDENT STUDY, COMMISSIONED BY STUDOR, HAS RESEARCHED WHETHER THE STUDOR SYSTEM,
INCORPORATING STUDOR AIR ADMITTANCE VALVES (AAVS) AND STUDOR P.A.P.A.s™ (POSITIVE AIR PRESSURE
ATTENUATORS) ™, IS THE MOST COST EFFECTIVE DRAINAGE SYSTEM ON THE MARKET ACROSS ALL BUILDING
HEIGHTS, DUE TO ITS REDUCED PIPEWORK REQUIREMENTS WHICH RESULT IN A FASTER AND EASIER
INSTALLATION PROCESS IN ADDITION TO THE MATERIAL SAVINGS.