hydromax siphonic drainage leaders in siphonic drainage
TRANSCRIPT
HydroMax™ Siphonic Drainage
Leaders in Siphonic Drainage
Topics Covered
Brief History of Siphonic Drainage
General Principles of Gravity Rainwater Drainage
Principles of Siphonic Drainage
Benefits and applications of Siphonic Drainage
Installation and Maintenance
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• Prior to March 2007, there were no comprehensive product and design standards for siphonic drainage.
• As such siphonic drainage was promoted by suppliers in different formats with various slants aimed at their own offerings
• The HydroMax focus is on offering high quality, sustainable products with highly accurate and user friendly design software
• Our approach is to dispel the “smoke and mirrors” educate how they work in accordance with the current British and/or American Standards
• Technical Support to Design Engineers and Registered Installers
Introduction to Siphonic Drainage
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Siphonic Drainage – Brief History• Concept invented in Finland by Olavi Ebling in late 1960’s• First major installation in Sweden in 1972.• Unregulated Industry Grew through 1980’s• UK Government Commissioned Research during the 1990’s
(Refer HR Wallingford SR 463 & SR 473)• European Standard BS EN 12056-3 introduced in 2000
(1st Standard to include a section for Siphonic drains)• 2005 – ASME A112.6.9 Siphonic Drain Test issued in USA• 2006 – Singapore Standard SS 525 includes siphonic drainage• 2007 – Comprehensive Siphonic Drainage Standards
published in UK and USA (BS 8490 and APSE 45)
What is HydroMax™Siphonic Roof Drainage?
HydroMax™ is an innovative solution which utilises the power of a natural siphon to create
a high-performance roof drainage solution.
HydroMax™ is an Engineered Solution which provides many Technical BenefitsHydroMax™ offers cost savings
normally ranging from25% to 45%!
Why use HydroMax™ Siphonic Roof Drainage?
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What is wrong with Traditional Gravity Drainage Systems?
Traditional Gravity drainage systems work but they are inefficient and have a number
of factors restricting performance.
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Restrictive Factors of Gravity Drainage
1. The water flow-rate is dictated by the gradient available (this gradient also restricts the distance a pipe can travel).
2. Multiple rainwater pipes in locations largely dictated by the gravity hydraulics rather than design team choice.
3. Gravity drains require ⅔ air to transport ⅓ water.4. Vortex formation within vertical gravity pipes results in the
water being transported in an inefficient spiral motion rather than straight through the pipe.
5. The driving force is only the depth of ponding or ‘head’ of water above the roof drain.
Gravity 10” Drain – Depth = 7.3” to Discharge 1500 GPM
“High Performance” Gravity Drain (from Manufacturers web-site)
(250mm Drain – Depth = 185mm to Discharge 95 l/s)
HydroMax 125mm (5”) Drain
125mm Drain – Depth = 95mm to Discharge 95 l/s
Equivalent Flow(95 l/s – 1500GPM)
Half the Diameter
Half the ponding depth of the Gravity
drain
Vertical Gravity pipes run ‘full’ at only 1/3 water
⅓ water in annular flow
⅔ air core
Horizontal (Sloping) Gravity pipes run ‘full’ at only 2/3 water
Extensive Underground Drainage
Drainage under Building Floor
Multiple Downpipes
Typical Traditional Gravity Drainage System
Sloping Underground Drainage makes for difficult routing to attenuation/harvesting
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Principles of Gravity Drainage
Vortex motion
A large amount of Air is required to move a small amount of water.
Extremely InefficientAnnular Flow
Water adheres to pipe wall
Central Air Core
Siphonic Drainage
No Air!
Why is HydroMax™ different from gravity drainage?
Pipes run 100% full bore
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Principles of HydroMax™ Siphonic Drainage
• The Siphonic Roof Drain eliminates air entering the pipe promoting water filled pipework
• The full bore of the pipe work carries the rainwater
• Water, without air, accelerates down the vertical downpipe, creating negative pressure and naturally generating a high performance siphonic flow
• The full height of the building provides the energy for this highly efficient Rainwater Drainage Solution
Siphonic Drainage - How it works
PAtmos
- gh
The inducer on the roof drain prevents air ingress
and so
Rainwater falling down the vertical pipe accelerates, creating negative pressure
PAtmos
- gh
Siphonic Drainage - How it works
More Height = Greater Negative pressure
PAtmos
- gh
Greater Negative Pressure = Higher Flow Rates
PAtmos
- gh
The full height of the building provides the energy for this highly efficient Rainwater Drainage Solution
Siphonic Drainage - How it works
Tail-pipes
Horizontal collector pipe
Downpipe
Discharge
Roof or Gutter HydroMax Roof Drain
Siphonic Drainage - How it worksHydroMax Siphonic Systems are self-draining
therefore the pipes are empty before a rainfall event
HydroMax System with Tailpipes primed
RoofHydroMax Roof Drain
Tail-pipes
Horizontal Collector Pipe
Drop pipe
Discharge
Pressure
Gravity flow in pipework
Air above water
Stage 1 - Wavy or Gravity flow
Priming of Main Pipe Work
Stage 2 - Plug flow
Air pockets driven down pipework
Plug of water filling whole pipe at high velocities which achieves self-cleansing.
Tests have shown that self-cleansing can be achieved at as low as 10% to 15% of the design rainfall rate.
Priming of Main Pipe Work
Stage 3 - Bubble flow
Air bubbles in suspension carried at high velocity
Water filling whole pipe
Priming of Main Pipe Work
Stage 4 - Full-bore flow
Water filling whole pipe
No more air entry – Air within Pipe now Fully Purged
Priming of Main Pipe Work
Roof or Gutter HydroMax Roof Drain
Tail-pipes
Horizontal Carrier Pipe
Downpipe
Discharge
NegativePressure
Fully Primed HydroMax System
The full height of the building provides the energy for this highly efficient Rainwater
Drainage Solution
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Principles of HydroMax™ Siphonic
Eliminate Air Ingress
Pipes run Full-Bore with Water
Building Height provides energy for High Self-Cleansing Velocities
Extremely Efficient
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HydroMax™ Siphonic Roof Drainage Video
Click Here
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HydroMax™ Simulation of
Non-Maintained Roof
Click Here
High Performance Roof Drains
Significant Reduction in Underground Drainage
Route to Harvesting or Attenuation
No Drainage Under Building
Flexible, DownpipePositioning
Siphonic Roof Drainage System
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System Comparison
air
core
HydroMax Siphonic
TraditionalGravity
water in annular flow
wa
ter
wa
ter
wa
ter
No Air
air core
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60m100m
HydroMax Siphonic Scheme
360 metres HDPE Pipework
Diameters 56mm to 200mm
Traditional Gravity Solution
530 metres Pipework
Diameters 160mm to 450mm
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HydroMax System Termination
Siphonic pipework should enter manhole chamber above the drain invert and be clear of any standing water to ensure free discharge
Manhole or Catch Pit to have Grate CoverNote: British Standard BS 8490 states the size of
free area for the Grate should be twice cross sectional area of siphonic pipe. American ASPE
Technical Design Standard 45 does not dictate the size of vented area.
HydroMax Siphonic System TerminationVertical Siphonic Pipe
Offset (if required) to line up with below grade pipe
Important:Below Grade Drain must be vented and sized to take the volume of discharge under
Gravity flow conditions.
Do not size to match siphonic Pipe diameter. Flex-Seal
flexible, expansion coupling
Important:
If siphonic drainage is utilised to drain part way down a high rise building –
A siphon break point must be adequately vented to atmosphere at the point of transition to gravity flow.
HydroMax Siphonic System Termination
Ventilated to Atmosphere
Break to Gravity flow
Siphonic flow
Recommended Vent size being Two-Thirds Gravity Pipe size
(two-thirds air to one third water in the gravity pipe)
HydroMax Siphonic System Termination
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Suitable Projects for Siphonic Drainage Retail Chains
Royal Ascot Racecourse
Ricoh Stadium and Arena, Coventry
Stadium of Light, Sunderland
Suitable Projects for Siphonic Drainage Stadia
Dundrum Retail Shopping Malls with multi-level Car Parks
Suitable Projects for Siphonic Drainage 313 Orchard Road, Singapore
Commercial Office BuildingsSuitable Projects for Siphonic Drainage
Accident Fund, Lansing
E-Tek Flagship Trinidad Stryker HQ, Newbury
Accommodation/Hotels/PrisonsSuitable Projects for Siphonic Drainage
Student Accommodation, Wembley
Johnstone County Detention Center
Ibis Hotel, Singapore
Hospitals
Suitable Projects for Siphonic Drainage Forest Park Medical Center, Dallas
Mercy Hospital, Des Moines, IA
Apartment Blocks
Podium Decks
Suitable Projects for Siphonic Drainage
Green Roofs
Suitable Projects for Siphonic Drainage
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Siphonic Drains installed at waterproofing membrane level
Suitable Projects for Siphonic Drainage
Green Roofs
Airports
Suitable Projects for Siphonic Drainage
Gimhae South Korea
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Warehousing & Distribution Centres
110,000m² for Tesco
Suitable Projects for Siphonic Drainage
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Manufacturing Plants
Suitable Projects for Siphonic Drainage
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Flagship Projects
Scottish Parliament
Suitable Projects for Siphonic Drainage
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Flagship Projects
Masdar City MIST 1B, Abu Dhabi
Suitable Projects for Siphonic Drainage
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50mm Balcony Siphonic Roof Drain
HydroMax Siphonic Products
This is a special drain for multi floor balcony drainage.The drain has a built in Anti-Backflow device.
Flow Rate Max. = 1.5 l/s(Litres per Second)
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50mm Terrace Siphonic Roof Drain
HydroMax Siphonic Products
Flow Rate Min. = 1.5 l/s(Litres per Second)
up to
Max. = 25 l/s
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75mm Siphonic Roof Drain Our Metric series of drains come in a range of
models for compatibility with all roof types
HydroMax Siphonic Products
Flow Rate
Min. = 1.5 l/s(Litres per Second)
up to
Max. = 25 l/s
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75mm Siphonic Overflow Roof Drain Our Metric series of Overflow drains come in a
range of models for compatibility with all roof types
HydroMax Siphonic Products
Flow Rate
Min. = 1.5 l/s(Litres per Second)
up to
Max. = 25 l/s
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125mm Siphonic Roof DrainOur Metric series of drains come in a range of
models for compatibility with all roof types
HydroMax Siphonic Products
Flow Rate
Min. = 10 l/s(Litres per Second)
up to
Max. = 100 l/s
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Range of Accessories for Our Metric Series of Drains
HydroMax Siphonic Products
• Leafguards
• Gravel Guards
• Car Park Drains
• Bespoke Accessories
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3” Siphonic Roof DrainOur North American series of drains have all been tested to ASME 112.6.9:2005 – IAPMO certified (file number 5305)
Wade-HydroMax Siphonic Products
Flow Rate
Min. = 23 GPM(Gallons per Minute )
up to
Max. = 415 GPM
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4” Siphonic Roof DrainOur North American series of drains have all been tested to ASME 112.6.9:2005 – IAPMO certified (file number 5305)
Wade-HydroMax Siphonic Products
Flow Rate
Min. = 75 GPM(Gallons per Minute )
up to
Max. = 750 GPM
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5” Siphonic Roof DrainOur North American series of drains have all been tested to ASME 112.6.9:2005 – IAPMO certified (file number 5305)
Wade-HydroMax Siphonic Products
Flow Rate
Min. = 120 GPM(Gallons per Minute )
up to
Max. = 1300 GPM
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6” Siphonic Roof DrainOur North American series of drains have all been tested to ASME 112.6.9:2005 – IAPMO certified (file number 5305)
Wade-HydroMax Siphonic Products
Flow Rate
Min. = 160 GPM(Gallons per Minute )
up to
Max. = 1800 GPM
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3”, 4”, 5” and 6” Siphonic Roof Overflow DrainOur North American series of drains have all been tested to ASME 112.6.9:2005 – IAPMO certified (file number 5305)
Wade-HydroMax Siphonic Products
C.I. No-Hub Outlet K factor
Minimum GPM Inflow
Maximum GPM Inflow
3” 0.12 23 4154” 0.08 75 7505” 0.04 120 13006” 0.04 160 1800
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3”, 4”, 5” and 6” Drain AccessoriesLeafguards, Debris Guards, Underdeck Clamps and Bearing
Pans are available for all drains.
Wade-HydroMax Siphonic Products
Our 3” and 4” Drains are available as Podium Deck Drains
Drain shown with Debris Guard
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•High Performance
•Versatile and Compatible with any Roof• Compact for installation in gutters/scuppers
• Anti Tamper Fastening of one-piece Inducer
• Proven track record of Low Maintenance
HydroMax Siphonic Drain Benefits
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HydroMax™ HDPE Siphonic System
Pre-Fabricated in Factory Controlled Conditionswith Engineered Rail Fastening System
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HydroMax™ Siphonic System60,000m² Roof
Only 4 Rainwater Downpipes draining the Main Roof
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HydroMax™ Collector Pipe at High Level
HydroMax™ Siphonic System
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Level, Small Diameter, Pipes Makes for Easy Co-ordination with structure and services
HydroMax™ Siphonic System
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HydroMax™ Pipework Installed Absolutely
Flat Level atHigh level
HydroMax™ Siphonic System
Development of Key Standards & Codes
• BS EN 12056-3:2000(includes Siphonic Drain Test)
• ASME 112.6.9:2005 (Siphonic Drain Test)• ASPE Technical Design Standard 45:2007
(Design, Installation & Product Standard)
• BS 8490:2007 (Design, Installation & Product Test Standard)
Development of HydroMax™• Consultation with HR Wallingford (previously commissioned
by UK Government to study siphonic drainage) ensured our offering progressed the technology above competitors systems
• HydroTechnic™ hydraulic calculations report extreme conditions giving high accuracy(other systems report average hydraulic conditions)
• Independently tested by Hydraulic Research Centre Wallingford (HRW) for compliance with BS EN 12056-3:2000
• Independently tested to ASME 112.6.9 (IAPMO File #5305)
• Full Compliance with current SS525, BS 8490:2007 & ASPE 45
• 100% Success Rate
Development of HydroMax™
• Full Compliance with SS525:2006
• Full Compliance with BS 8490:2007
• Full Compliance with ASPE Design & Engineering Standard 45
• 100% Success Rate
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Primary and Overflow Systems
• Primary Roof Drains installed at roof level or at gutter sole level
• Drains direct to underground drainage
50mm
Raised Inlet to Drain • Overflow Roof Drain Inlet raised
to 50mm above gutter sole.• Drains to Atmosphere often at
high level or to walkways or car parks
• Must not connect to Primary System (as this would normally be a vent)
Using HydroMax Overflow System can offer the same technical and commercial benefits obtained using the HydroMax™ Primary Drains
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Maintenance by Design
Roof Level
Raised Inducer Level
Primary Drain Overflow Drain
Regional Options: Dry Season Covers for Gulf Region
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Siphonic Drainage Analytical Design ProgramHydroMax™ provides the following:
• Web based HydroTechnic™ program for easy Technical Support
• Fast Accurate Calculations in full compliance with SS525, BS 8490 & ASPE 45
• Advanced Edit Functions to accommodate on-site changes
• Program Generation of Pre-Fabrication Drawings (Eliminates risk of human interface errors)
• Exports data in electronic format for O & M files
Following calculation of rainfall inflows and determination of required pipe routing, the Design Engineer ‘Draws’ the piping system into the calculation program
Metric Version
USA Version ft/in and GPM
Siphonic Drainage Analytical Design Program
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Pipe diameters are edited to find the optimum solution
Metric Version
USA Version
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Key Advantages with HydroMax™• Drains independently tested to:
– BS 8490:2007– ASME 112.6.9:2005
• Designs to BS 8490 or ASPE 45• Independently tested HydroTechnic™ design software
(confirmed to have “unsurpassed accuracy”)• Range of High Performance Roof Drains (Outlets)• HDPE Pipes to EN 1519 (not for North American Market)
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Key Advantages for Building Owners
• High Performance, Self-Cleansing Roof Drainage System
• Fewer Rainwater Downpipes routed to convenient positions providing an increased and flexible use of floor space
• Proven Record of Low Maintenance
• Elimination of underground drainage, manholes, etc. within the building footprint
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Key Advantages for the Design Team
• Smaller diameter horizontal pipework installed level
• An Engineered Solution allowing choice of discharge locations
• Flexible Pipe routing with easy co-ordination of services
• Rainwater Management - HydroMax™ can route pipework to attenuation/rainwater harvesting.
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Key Advantages for the Main Contractor
• Improved Construction Build Program
• Significant Cost Savings
• A dry building envelope is attained at an early stage of construction allowing fit-out works to proceed earlier
• Less Trench work for below ground drainage saving excavation, soil treatment, pipe laying, back fill compaction, etc.
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Engineers Training Day – Topics Covered
• Key Aspects of BS 8490:2007/ASPE 45/SS 525• Hydraulic Parameters • Piping Layout Design (do’s and don'ts)• Hands-on HydroTechnic training• Understanding how to Edit Systems within
HydroTechnic™ to cater for design or onsite changes• Specification Writing
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Information Requirements For HydroMax to Provide Concept Designs
• Design Rainfall Rate• Roof Plan Drawings (AutoCAD)• Floor Plan Drawings (AutoCAD)• Sections/Elevation Drawings (AutoCAD)• Underground drainage Connections• Attenuation or Rainwater Harvesting Requirements• Gutter Profile (to allow compatibility checks)• Specification (we can provide CSI or R10 type spec.)
