Siphonic Roof Drainage

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Siphonic Roof Drainage
Introduction Siphonic Action Gravity vs. Siphonic
Drainage Siphonic Drains Tailpipes Pipework LEED
- Green Building Design Applications Why
Siphonic? Siphonix Software
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Introduction

• Invented and patented 1968 by Olavi Ebeling

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Introduction

• Invented and patented 1968 by Olavi Ebeling
• A fully engineered system based on hydraulic
  principles

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Introduction

• Invented and patented 1968 by Olavi Ebeling
• A fully engineered system based on hydraulic
  principles
• Highly efficient

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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

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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

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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

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Siphonic Action

• First use documented in ancient Egypt

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Siphonic Action

• Created by a pipe completely filled with fluid
  with one end lower than the other

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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

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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

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Siphonic Action

• The point of ingress must be higher than the exit
  point

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Siphonic Action

• The point of ingress must be higher than the exit
  point
• The greater the height difference, the greater
  the capacity

h
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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
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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
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Gravity vs. Siphonic Systems

• Gravity

Air
Water
In gravity systems, water adheres to the wall of
the pipe Typically only 30 of the pipework is
filled with water 70 is air
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Gravity vs. Siphonic Systems

• Gravity
• Siphonic

Air
Water
In gravity systems, water adheres to the wall of
the pipe Typically only 30 of the pipework is
filled with water 70 is air
In a primed working siphonic system, 100 of
the pipe is filled with water Pipework can
therefore be significantly smaller
Water
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Gravity vs. Siphonic Systems

• Gravity

Deeper water above outlet
Clashes with other services
Bigger pipe size
Pipe with gradient
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Gravity vs. Siphonic Systems

• Gravity
• Siphonic

Deeper water above outlet
Clashes with other services
Bigger pipe size
Pipe with gradient
Lower waterdepth above outlet
Smaller pipe size
Easy coordination with other services
Pipe runs level
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Gravity vs. Siphonic Systems

• Gravity
• Number of downpipes
• Significant underground work
• Intrusive piping

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Gravity vs. Siphonic Systems

• Gravity
• Number of downpipes
• Significant underground work
• Intrusive piping
• Siphonic
• Fewer downpipes
• Minimised underground work
• High level pipes
• Horizontal pipes

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Siphonic Drains

• Outlet its just a controlled hole in the roof!

Air baffle
Roof drain (Outlet )
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Siphonic Drains

• Outlet its just a controlled hole in the roof!
• Siphonic action only occurs when the air baffle
  is completely submerged

Air baffle
Roof drain (Outlet )
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Siphonic Drains
Dome strainers
Air Baffle
Air Baffle
Air Baffle
Outlet (various diameters for each manufacturer.
No hub and threaded available)
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Siphonic Drains

• Design testing performed with CRM Drainage
  Consultants

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Siphonic Drains

• Design testing performed with CRM Drainage
  Consultants
• Full siphonic test rig

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Siphonic Drains

• Design testing performed with CRM Drainage
  Consultants
• Full siphonic test rig
• Conforms to ASME Standard A112.6.9-2005

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Siphonic Drains
Conventional Roof Drain
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Siphonic Drains
Siphonic Roof Drain
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Siphonic Drains

• This is TESTING ONLY
• Pipes are NOT secured as they should be

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Siphonic Drains
Pipe System Priming
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Tailpipes

• Connects the roof drain to the horizontal
  collector

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Tailpipes

• Connects the roof drain to the horizontal
  collector
• Pipes must be vertical and horizontal not
  inclined

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Tailpipes

• Connects the roof drain to the horizontal
  collector
• Pipes must be vertical and horizontal not
  inclined

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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

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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!

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Pipework

• Pipes are installed horizontal vertical

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Pipework

• Pipes are installed horizontal vertical
• Eccentric fittings should be used where
  possible

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Pipework

• Pipes are installed horizontal vertical
• Eccentric fittings should be used where
  possible
• Expansion in the downpipe should be avoided

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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

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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

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On the roof
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On the roof
High water mark midpoint between drains
Secondary / Overflow
Primary
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LEED - Green Building Design

• Encourages and accelerates the adoption of
  sustainable green building development
  practices

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LEED - Green Building Design

• Encourages and accelerates the adoption of
  sustainable green building development
  practices
• Conserving water

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LEED - Green Building Design

• Encourages and accelerates the adoption of
  sustainable green building development
  practices
• Conserving water
• Reducing energy consumption

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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

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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

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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

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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

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LEED - Green Building Design

• Siphonic Roof Drainage can gain points

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LEED - Green Building Design

• Siphonic Roof Drainage can gain points
• Reduced site disturbance (SS Credit 5.1)

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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)

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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)

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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)

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Applications

• Large footprint buildings!
• Warehouses
• Distribution Units
• Airports
• Sports Stadia
• Shopping Malls
• Factories

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Why Siphonic?

• Greater efficiency
• Smaller pipes
• Fewer outlets
• Easier maintenance

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Why Siphonic?

• Greater efficiency
• Smaller pipes
• Fewer outlets
• Easier maintenance
• Lower groundwork costs
• Less underground pipework

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Why Siphonic?

• Greater efficiency
• Smaller pipes
• Fewer outlets
• Easier maintenance
• Lower groundwork costs
• Less underground pipework
• Reduced installation time
• Easier to install

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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

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Siphonix Software
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Siphonix Software
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Siphonix Software
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Siphonix Software
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Siphonix Software