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With your questions related to the Siphonic system will beTHUY SANH answer below:

 Stormwater drainage systems use the entire height of the building to power a powerful drainage system. A combination of components combine to create a Siphonic Storm Drainage System. The pipe system is empty before the rain. When it starts to rain, the Siphonic Roof Drainage System prevents further air from entering the pipe system, while its anti-vortex fins also prevent vortex formation. Start with small diameter pipes and when the water reaches the riser, the water will accelerate due to the force of gravity. This acceleration creates negative pressures which is why the system is called ‘Siphonic’ and the forces draw water off the roof until the rainfall subsides.

2. WHAT TYPES OF CONSTRUCTION ARE SUITABLE FOR SIPHONIC?

 Types of buildings with large roof areas, at least >500m2.

3. WHAT TECHNICAL / PRACTICAL BENEFITS ARE PROPOSED FOR DESIGN AND INSTALLATION OF A SIPHONIC RAINWATER SYSTEM?

The drainage flow of the Siphonic system is 3-5 times that of the Gravity system

Reduce the number of drainage funnels on the roof/gutter surface

Reduce drainage pipe diameter

Reduce total drainage pipe length

Siphonic systems have fewer vertical exhaust pipes. Helps the architectural layout be more beautiful, compact and easier to collect water into the tank/culvert location. As well as reducing foundation and underground pipe costs.

The drain pipe of the Siphonic system can be arranged horizontally along the roof (no need for slope like the Gravity system), so it saves more space.

Capable of self-cleaning pipes, no need for cleaning intervention due to high flow rate. Reduce pipeline maintenance costs.

The water flow remaining on the roof is low and is withdrawn in a short time when the Siphonic operates at full capacity, without affecting the water permeability of the roof.

The underground pipe system is minimized inside the building and significantly reduced outside the house, helping to save costs and improve the ability to build on many specific locations or construction locations.

Rainwater is collected centrally. Should be easy to collect in storage tanks or reuse tanks (such as irrigation tanks, ponds, or fire fighting water tanks...)

Speed up construction progress by shortening installation time

The larger the roof area and building height, the more effective the Siphonic is at drainage

Reduces time, costs and easily coordinates installation with other items because the pipes do not have slopes

The appearance of the project is scientific and reasonable.

4. SO WHAT IS THE PROBLEM WITH TRADITIONAL DRAINAGE SYSTEMS?

The performance of traditional gravity drainage systems is limited by a number of factors. Include:

The driving force is the water depth or elevation above the roof drain cap,

A slope is required to allow water to flow in a horizontal pipe (this slope also limits the distance the pipe can travel), resulting in many vertical pipes and a large amount of underground drainage.

Traditional drainage systems contain only 1/3 of water and the remaining air

Vortex formation on vertical pipes results in water being transported in a spiral motion rather than straight through the pipe.

The above factors lead to an ineffective drainage solution.

5. HOW TO DESIGN THE ROOF OF THE BUILDING SUITABLE FOR THE SIPHONIC SYSTEM?

 The roof should be designed the way you want. Siphonic rainwater drainage system is designed to suit all roof types. However, with high-performance Siphonic rainwater drainage funnels, the number of these collecting funnels can be minimized and there is less impact on the roof and thus design coordination can soon achieve the optimal solution.

6. HOW ARE THE COMPONENTS OF THE HYDRAULIC RAINWATER Drainage Funnel Guaranteed?

 Most roof drain covers have several separate components that perform the functions of removing air, preventing vortex formation, and priming. Through a roof cap design that incorporates a one-piece shield securely fixed using pillar bolts, Thuy Sanh has reduced the risk of one or more of these elements being removed or misplaced in the maintenance process.

7. HOW TO END THE SIPHONIC SYSTEM?

 The Siphonic Roof Drainage System is terminated by connecting to a suitable length of discharge pipe (to reduce the risk of side loading) or a suitably sized manhole/connection pit to cater for the discharge from the System  Drainage.

8. CAN AQUARIUM SIPHONIC SYSTEM RUN UNDERGROUND?

 Yes, if piping is factored into the system design. When a Siphonic system runs horizontally below ground, the horizontal portion will create energy losses, which will counteract the energy gain in the system. Thus, there will be a point where the system cannot continue in Siphonic mode.

9. WHAT CREATES THE SIPHONIC EFFECT?

 It's simple hydraulics that make the Siphonic stormwater system work. The height of the building provides power and as the small pipes are filled with water, the water in the vertical shaft will also be filled and accelerated by gravity. This acceleration creates negative pressure behind the water column and siphonics are formed, suction forces are created that literally suck the water off the roof until the rain event subsides.

10. WHAT MECHANICAL DEVICE OR PUMP IS USED TO CREATE SIPHONIC OPERATION?

 No, it is simply Hydraulics that makes the Siphonic roof drainage system work. When the small diameter pipes and fill pipes reach the vertical top, the water accelerates due to gravity. This acceleration creates negative pressure behind the water column, creating its Siphonic formation and the forces created literally suck the water off the roof until the rain event subsides.

11. DO SIPHONIC PIPES ALWAYS HAVE WATER INSIDE?

 No, when the rain ends, rainwater will flow out from the roof through the pipe system until the water is completely gone.

12. CAN PIPES HAVE AN UPGRADE SLOPE?

 No, in theory, the negative pressure created will be able to transport water uphill, but in reality, if there is an uphill slope, after the end of the rain the water will certainly remain in the pipe.

13. WHAT IS THE MAXIMUM NUMBER OF Drainage Funnels That Can Be Connected In One System?

There is no specific number, there are a number of factors that determine the number of water collection funnels including roof area, system filling time (main time), building height, horizontal pipe length,...

14. HOW FAR CAN A SIPHONIC SYSTEM DRIVE WATER HORIZONTALLY?

 Every project is different and therefore the distance the Siphonic system can run horizontally depends on a number of factors. Key factors include 1) Building height (energy for the system), 2) Complexity of pipe configuration (friction losses through fittings), and 3) Design rainfall intensity (produces transported rainwater).

15. HOW MUCH HEIGHT IS REQUIRED FOR A SIPHONIC SYSTEM TO WORK?

 Every project is different and therefore the height required to create water absorption can vary depending on a number of factors. Key factors include 1) Horizontal run length (frictional energy losses through the piping system), 2) Complexity of the piping configuration (frictional energy losses through fittings), and 3) Design rainfall intensity (generating the amount of rainwater to be transported). We have seen small individual systems, typically used where spills are less than 0.8m (2.6ft)

16. MAINTENANCE REQUIREMENTS WITH SIPHONIC SYSTEMS?

All roof, traditional gravity and Siphonic drainage systems must be maintained to suit local conditions and we therefore recommend operating a regular maintenance regime. The cleanliness of the roof is the most important issue. Clearing all debris from around the rain cap and from inside the gutter is necessary however care should be taken not to drop debris into the roof drain cap.

17. IS A SIPHONIC SYSTEM MORE LIKELY TO CAUSE Clogging THAN A TRADITIONAL DRAINAGE SYSTEM?

 No, the system is designed with a minimum flow velocity set according to requirements or standards. High velocity with filling flow ensures self-cleaning of the pipe. Standard BS 8490: 2007 (UK) requires 1.0 meters per second (3.28 ft/s); ASPE 45:2007 (USA) calls 3ft per second (0.91m/s) and SS 525:2006 (Singapore) calls 0.7m/s (2.29ft/s).

18. CAN SIPHONIC SYSTEM BE APPLIED TO HIGH RISE BUILDINGS?

 Have. However, sometimes if the building is too tall and the hydraulics create negative pressures that exceed our design parameters, design engineers will circumvent the Siphonic operation by changing to a gravity flow design. force at an appropriate point falls on the building. With this design, technical and economic benefits are achieved because the pipe system can be collected at high levels without the need for slopes and requires fewer stormwater pipes.

19. CAN LEAVES, DUST, etc. BE THE CAUSE OF Clogging of the SIPHONIC RAINWATER FUNNER?

 Siphonic stormwater systems have a proven track record of low maintenance. The system is designed with high flow velocities in the pipes, whereby there is negative pressure in the piping system that draws water off the roof, also at high flow rates. Any small debris such as leaves, twigs, etc. will be pulled into the pipe system and flushed away.

20. HOW DOES SIPHONIC PREVENT Clogging FROM LARGE OBJECTS?

 The Siphonic rain drainage system has been designed with anti-vortex fins protruding from the flat plate of the cover. Thanks to these fins, large debris will not be able to pass through. Water will flow through the obstruction and into the storm drain cover. However, regular maintenance should be performed as with a traditional gravity roof drainage system for large obstructions.

21. CAN A TRADITIONAL DRAINAGE SYSTEM BE CONNECTED TO A SIPHONIC SYSTEM?

 No, unless the pipeline downstream from the point where the pipeline connects is a gravity flow system. Traditional flow is approximately 1/3 water and 2/3 air. Air in the gravity tube will disrupt the Siphonic action.

22. CAN A SIPHONIC SYSTEM BE CONNECTED TO A TRADITIONAL DRAINAGE SYSTEM?

 True but that would be the end (or transition) point of the Siphonic system and the drain from the connection point onwards would have to be sized for traditional gravity flow with about a water and air mixture.

23. CAN THE SIPHONIC SYSTEM BE CHANGED?

 A Siphonic drainage system is a hydraulic design solution and therefore, hydraulic calculations are required before making any changes.

24. CAN A SIPHONIC SYSTEM BE USED FOR PARKING LOT DRAINAGE?

 Siphonics can be used to drain water on the top floor of a multi-storey car park which is the main rain catchment area. It is the top floor of multi-storey car parks, it also needs to provide the necessary height to operate the Siphonic system.

25. CAN SIPHONIC SYSTEMS BE USED TO DRAIN WATER IN WALKING AREA?

Yes if there is enough rain catchment area and suitable height to create a Siphonic effect.

26. CAN SIPHONIC SYSTEMS BE USED FOR DRAINAGE OF ROADS AND BRIDGES?

 Yes if there is enough rain catchment area and suitable height to create a Siphonic effect.

27. HOW LONG FROM START DOES THE SIPHONIC SYSTEM ACHIEVE MAXIMUM PERFORMANCE?

 Limit fill time to less than 60 seconds to ensure the system operates properly in accordance with British BS 8490:2007 standards.

28. ARE VISIT POINTS / POKE POINTS / CLEANING EYES REQUIRED IN THE SYSTEM?

 Are not. Siphonic roof drainage systems are designed to run all fill water at high velocity. This ensures that the pipes are self-cleaning. Blocked probes will create air pockets in the system, which will disrupt the siphonic action. However, we recommend installing an access pipe over the vertical portion of the finished above-ground depression to provide a below-ground drain cleaning facility.

29. DO ANY COMPONENTS NEED REPLACEMENT DUE TO WEAR OR CRACKS?

 There are no moving or mechanical parts in a Siphonic roof drainage system so it is not necessary to replace any parts. It is recommended that during routine maintenance, all roof hoppers are inspected to ensure all covers are intact and the pipework is firmly secured.

30. IS SPILL DISCHARGE REQUIRED?

 British Standards and US requirements require the provision of an overflow and we always recommend the installation of an overflow to any roof drainage system whether it is a traditional gravity system or a stormwater system. Siphonic.

31. CAN YOU HAVE A ROOF Drainage Funnel for a Roof Area?

 It is best to have a minimum of two hoppers for a single roof area or, alternatively, one roof hopper with an overflow system.

32. WHAT HAPPENS IF THE UNDERGROUND DRAINAGE SYSTEM IS OVERLOADED OR BLOCKED?

 We always recommend installing an overflow to any roof drainage system whether it is a traditional gravity system or a Siphonic roof drainage system. This will provide another means of drainage if the main drainage system fails.

33. DOES THE SIPHONIC SYSTEM MAKE NOISE DURING OPERATION?

 It would be impractical to try to simulate rain showers to sound test an actual Siphonic system. However, empirical acoustic tests in a test facility have documented that the highest noise level is when the system is operating at 50% capacity where there is an Air/Water mixture similar to that in the system. gravity drainage system. Testing concluded that noise levels were not great.

34. IS THE SIPHONIC SYSTEM VIBRATING DURING OPERATION?

 Not if installed correctly. Whatever piping material is used, installation instructions need to be followed correctly to prevent vibration. In addition, at the locations where the system's HDPE plastic piping system is installed, it is tightly attached to the rack designed in the factory. This limits maximum system vibration.

35. IS THERE NO WATER STANDING IN THE PIPES?

 This depends on a number of factors. Any piping system can produce condensation when there is the right combination of factors including 1) Thermal conductivity of the piping material, 2) Temperature/outside temperature of the rainwater , 3) Air temperature surrounding the pipeline, 4) Humidity surrounding the pipeline, and 5) Time of storm event.

36. SHOULD I USE AN ELBOW (LONG BEND RADIUS) INSTALLED AT THE END OF THE VERTICAL PIPES?

 Have. All bends on a Siphonic roof drainage system must be a radius or 45˚ bend (except immediately under the drain cap, where a 90˚ bend is permitted as this promotes rapid water filling).

37. CAN PIPELINES BE PAINTED? IF SO, WHAT TYPE OF PAINT SHOULD I USE?

 Painting the pipes does not affect the hydraulic performance of the Siphonic roof drainage system and is therefore entirely dependent on the pipe material chosen. Any paint must be selected to suit the piping system and applied strictly according to the paint manufacturer's instructions.

38. WHAT PIPING MATERIALS CAN BE USED IN SIPHONIC SYSTEMS?

 For economic reasons (along with the wide range of pipe diameters available), HDPE plastic is the most popular choice, cast iron, PVC SCH40 pipes or stainless steel can be used (carefully choose the pipe connection method). ,…

39. CAN DIFFERENT PIPING MATERIALS BE COMBINED IN ONE SIPHONIC SYSTEM?

 Have. This needs to be calculated accurately.

40. IS IT NECESSARY TO CREATE A SLOPE FOR THE COLLECTION FUNNERS ON THE GUNTERS?

 No, the design engineer will locate the drain along the length of the gutter to achieve the optimal solution.

41. CAN A SIPHONIC DRAINAGE SYSTEM BE INSTALLED IN SLOPED GUTTINGS?

 Yes, use a dam or embankment to design flow into the drainage cap and prevent water flow through to provide enough water flow for the drainage cap.

42. ROOF/SLOPE REQUIREMENTS NECESSARY FOR Drainage Funnels In Gutters/Flat Roofs?

 The drainage cover will be positioned to suit the structure/slope, etc. of the roof as designed. If there are any additional considerations required, the design engineer will advise as necessary.

43. WHAT HAPPENS IF PART OF THE Drainage Funnel IS REMOVED OR MISSING?

 All Siphonic roof drainage systems require all components to perform according to design requirements. The Siphonic drain has a securely screwed one-piece lid to reduce the risk of loss. This also provides a means to easily identify any missing components for maintenance personnel. If there is a missing cover but there is enough water to cover the drain cover, the roof drainage system will perform even though it is not performing at the designed level. A good maintenance regime should be in place to ensure all drain funnels are fully fitted with components.

44. CAN Clogging OCCUR FROM SNOW?

 There will be no runoff from the roof when covered with snow, but at the moment it melts, the high capacity of the Siphonic roof drainage system will ensure the melt water is safely removed. Additionally, on primary drainage systems connected to the underground drainage system, heat from the ground rises through the pipe system and melts snow at the drain hopper.

45. CAN A SIPHONIC DRAINAGE SYSTEM INCORPORATE A SLOPED PIPING SYSTEM?

 Sloping pipes can be integrated into a Siphonic roof drainage system, but careful detailing is required to ensure the system still functions well enough.