The construction industry plays an essential role in australia s economy.
Siphonic roof drainage system design.
When the rainfall is heavy enough the gullies create reduced pressure in the pipe system.
Siphonic roof drainage systems must be sized with a hydraulic calculation by a validated program state law requires that this calculation must be performed by a licensed engineer.
Siphonic roof drainage is not so much a system in terms of a pre engineered product or package.
With a flat level design long horizontal runs above overhead ceilings are pos sible as shown in illustration 4.
It is instead a technique of no pitch pipe design used to achieve desired flow from roof drains to point s of discharge.
The siphonic roof drainage system is based on the ingenious gravity induced vacuum principle allowing a quick and efficient way of draining roofs comprising various shapes and gradients.
Many large industrial commercial and retail buildings are now fitted with siphonic drainage which has clear advantages over gravity drainage.
The water is sucked or siphoned from the roof down into the drain at high velocity.
Siphonic drainage was first introduced in the 1960 s in scandinavia and since then has been used widely across europe including the uk in the far east australasia south africa and the usa.
To research set standards and disseminate best practice in uk siphonic drainage from design to installation.
Syphonic systems are the most efficient method of doing this and whilst they can be applied to most industrial roofing designs you must always ensure that your system is installed by competent syphonic drainage contractors make sure your system runs properly.
By contrast a fully engineered siphonic roof drainage system contains an anti vortex plate that acts as a baffle and prevents air and debris from entering the piping system at full flow allowing the pipes to completely fill up with water.
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Aco siphonic drainage traffic free roof areas which are no larger than 150 m2 such as production buildings hangars or sports stadiums are suitable applications for siphonic drainage.
A siphonic roof drain has a special insert that acts as an air baffle and anti vortex vane such that only water is drawn off of the roof not air.
Either the contractors or the designers.
A professional support package is provided to clients based on sound engineering principles.
In fact australia is becoming a leader in siphonic roof drainage having conducted the only research worldwide in the past ten years.
With pipes as little half the size of conventional roof drainage sysems siphonic systems can reduce roof drainage costs by as much as 50 space savings siphonic roof drainage systems have no slope and so can greatly ease coordination in design and in the field.
