siphonic roof drainage introduction siphonic action gravity vs. siphonic drainage siphonic drains...
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Siphonic Roof Drainage
IntroductionSiphonic ActionGravity vs. Siphonic DrainageSiphonic DrainsTailpipesPipeworkLEED™ - Green Building Design ApplicationsWhy Siphonic?Siphonix® Software
Introduction
• Invented and patented 1968 by Olavi Ebeling
Introduction
• Invented and patented 1968 by Olavi Ebeling• A fully engineered system based on hydraulic
principles
Introduction
• Invented and patented 1968 by Olavi Ebeling• A fully engineered system based on hydraulic
principles• Highly efficient
Introduction
• Invented and patented 1968 by Olavi Ebeling• A fully engineered system based on hydraulic
principles• Highly efficient• Use spread from Scandinavia, through Europe,
Asia & Oceania
Introduction
• Invented and patented 1968 by Olavi Ebeling• A fully engineered system based on hydraulic
principles• Highly efficient• Use spread from Scandinavia, through Europe,
Asia & Oceania• System design simplified by current generation
of software
Introduction
• Invented and patented 1968 by Olavi Ebeling• A fully engineered system based on hydraulic
principles• Highly efficient• Use spread from Scandinavia, through Europe,
Asia & Oceania• System design simplified by current generation
of software• Gaining ground in USA
Siphonic Action
• First use documented in ancient Egypt
Siphonic Action
• Created by a pipe completely filled with fluid with one end lower than the other
Siphonic Action
• Created by a pipe completely filled with fluid with one end lower than the other
• Gravity will cause the fluid to drain through the lower end
Siphonic Action
• Created by a pipe completely filled with fluid with one end lower than the other
• Gravity will cause the fluid to drain through the lower end
• Cohesive forces between water molecules ensures the pipe remains full
Siphonic Action
• The point of ingress must be higher than the exit point
Siphonic Action
• The point of ingress must be higher than the exit point
• The greater the height difference, the greater the capacity
h
Siphonic Action
• The point of ingress must be higher than the exit point
• The greater the height difference, the greater the capacity
• The pipe must be completely full
h
Siphonic Action
• The point of ingress must be higher than the exit point
• The greater the height difference, the greater the capacity
• The pipe must be completely full
• Friction has a big impact
h
Gravity vs. Siphonic Systems
• Gravity
In gravity systems, water adheres to the wall of the pipe
Typically only 30% of the pipework is filledwith water – 70% is air
AirWater
Gravity vs. Siphonic Systems
• Gravity
• Siphonic
In gravity systems, water adheres to the wall of the pipe
Typically only 30% of the pipework is filledwith water – 70% is air
Water In a primed & working siphonic system,100% of the pipe is filled with water
Pipework can therefore be significantly smaller
AirWater
Gravity vs. Siphonic Systems
• GravityDeeper water above outlet
Clashes withother services
Pipe withgradient
Bigger pipe size
Gravity vs. Siphonic Systems
• Gravity
• Siphonic
Deeper water above outlet
Clashes withother services
Pipe withgradient
Bigger pipe size
Pipe runs level Easy coordinationwith other services
Lower waterdepthabove outlet
Smaller pipe size
Gravity vs. Siphonic Systems
• Gravity – Number of downpipes
– Significant underground work
– Intrusive piping
Gravity vs. Siphonic Systems
• Gravity – Number of downpipes
– Significant underground work
– Intrusive piping
• Siphonic– Fewer downpipes
– Minimised underground work
– High level pipes
– Horizontal pipes
Siphonic Drains
• Outlet: it’s just a controlled hole in the roof!
Roof drain (Outlet )
Air baffle
Siphonic Drains
• Outlet: it’s just a controlled hole in the roof!• Siphonic action only occurs when the air baffle
is completely submerged
Roof drain (Outlet )
Air baffle
Siphonic Drains
Air Baffle Air Baffle
Air Baffle
Dome strainers
Outlet (various diameters for each manufacturer. No hub and threaded available)
Siphonic Drains
• Design & testing performed with CRM Drainage Consultants
Siphonic Drains
• Design & testing performed with CRM Drainage Consultants
• Full siphonic test rig
Siphonic Drains
• Design & testing performed with CRM Drainage Consultants
• Full siphonic test rig• Conforms to ASME
Standard A112.6.9-2005
Siphonic DrainsConventional Roof Drain
Siphonic DrainsSiphonic Roof Drain
Siphonic Drains
• This is TESTING ONLY• Pipes are NOT secured
as they should be
Siphonic DrainsPipe System Priming
Tailpipes
• Connects the roof drain to the horizontal collector
Tailpipes
• Connects the roof drain to the horizontal collector
• Pipes must be vertical and horizontal – not inclined
Tailpipes
• Connects the roof drain to the horizontal collector
• Pipes must be vertical and horizontal – not inclined
Tailpipes
• Connects the roof drain to the horizontal collector
• Pipes must be vertical and horizontal – not inclined
• Expansion in the
vertical plane should
be avoided
Pipework
• Most materials are suitable– Cast Iron– Ductile Iron– Stainless Steel– Galvanised steel– Copper– ABS– HDPE– PVC
• Check ASPE Guide for details
• Remember pressure is negative!
Pipework
• Pipes are installed horizontal & vertical
Pipework
• Pipes are installed horizontal & vertical
• Eccentric fittings should be used – where possible
Pipework
• Pipes are installed horizontal & vertical
• Eccentric fittings should be used – where possible
• Expansion in the downpipe should be avoided
Pipework
• Pipes are installed horizontal & vertical
• Eccentric fittings should be used – where possible
• Expansion in the downpipe should be avoided
• Branches are joined in the horizontal plane
Pipework
• Pipes are installed horizontal & vertical
• Eccentric fittings should be used – where possible
• Expansion in the downpipe should be avoided
• Branches are joined in the horizontal plane
• Underground pipes must be considered
On the roof
On the roof
Primary
Secondary / Overflow
High water mark – midpoint between drains
LEED™ - Green Building Design
• “Encourages and accelerates the adoption of sustainable green building & development practices”
LEED™ - Green Building Design
• “Encourages and accelerates the adoption of sustainable green building & development practices”– Conserving water
LEED™ - Green Building Design
• “Encourages and accelerates the adoption of sustainable green building & development practices”– Conserving water– Reducing energy consumption
LEED™ - Green Building Design
• “Encourages and accelerates the adoption of sustainable green building & development practices”– Conserving water– Reducing energy consumption– Reducing the depletion of natural resources
and materials
LEED™ - Green Building Design
• “Encourages and accelerates the adoption of sustainable green building & development practices”– Conserving water– Reducing energy consumption– Reducing the depletion of natural resources
and materials– Creating a sustainable site
LEED™ - Green Building Design
• “Encourages and accelerates the adoption of sustainable green building & development practices”– Conserving water– Reducing energy consumption– Reducing the depletion of natural resources
and materials– Creating a sustainable site– Use of innovative design
LEED™ - Green Building Design
• “Encourages and accelerates the adoption of sustainable green building & development practices”– Conserving water– Reducing energy consumption– Reducing the depletion of natural resources
and materials– Creating a sustainable site– Use of innovative design– Improving indoor environmental quality
• Siphonic Roof Drainage can gain points
LEED™ - Green Building Design
• Siphonic Roof Drainage can gain points
Reduced site disturbance (SS Credit 5.1)
LEED™ - Green Building Design
• Siphonic Roof Drainage can gain points
Reduced site disturbance (SS Credit 5.1)Controlled flow roof drainage (SS Credit 6.1)
LEED™ - Green Building Design
• Siphonic Roof Drainage can gain points
Reduced site disturbance (SS Credit 5.1)Controlled flow roof drainage (SS Credit 6.1)Rainwater harvesting (WE Credit 3.1/3.2)
LEED™ - Green Building Design
• Siphonic Roof Drainage can gain points
Reduced site disturbance (SS Credit 5.1)Controlled flow roof drainage (SS Credit 6.1)Rainwater harvesting (WE Credit 3.1/3.2)Innovation in design (ID Credit 1.1)
LEED™ - Green Building Design
Applications
• Large footprint buildings! – Warehouses– Distribution Units– Airports– Sports Stadia– Shopping Malls– Factories
Why Siphonic?
• Greater efficiency– Smaller pipes
– Fewer outlets
– Easier maintenance
Why Siphonic?
• Greater efficiency– Smaller pipes
– Fewer outlets
– Easier maintenance
• Lower groundwork costs– Less underground pipework
Why Siphonic?
• Greater efficiency– Smaller pipes
– Fewer outlets
– Easier maintenance
• Lower groundwork costs– Less underground pipework
• Reduced installation time– Easier to install
Why Siphonic?
• Greater efficiency– Smaller pipes
– Fewer outlets
– Easier maintenance
• Lower groundwork costs– Less underground pipework
• Reduced installation time– Easier to install
• Greater architectural freedom– Fewer downpipes
– Level installation of pipework
– Smaller pipes
Siphonix® Software
Siphonix® Software
Siphonix® Software
Siphonix® Software
Siphonix® Software