Syphonic Rainwater Drainage Systems utilise special rainwater outlets and airtight pipework to promote full bore flow during heavy rainfall. These systems are now becoming popular especially for larger projects due to the cost and design benefits available compared to conventional roof drainage.
These benefits can include any or all of the following:
Downpipes are considerably smaller and/or fewer
Piping networks are generally smaller and can be laid level requiring less headroom and assisting with services co-ordination
Roof outlet numbers can often be minimised (especially below the building) normally giving considerable savings in cost and time.
Systems are designed to be self-cleansing and if maintained correctly and on a regular basis are normally trouble free.
Rainplus®, the ultimate solution in case of rain
Rainplus® is a siphonic rainwater drainage system designed to reach maximum drainage performance with the lowest levels of water accumulation on the roof.
Valsir Rainplus® fully meets the demands of increasing rainfall levels rainwater drainage from medium to large size buildings in total safety.
The system uses the building height as the driving force to generate high speed flow rates thus maximizing drainage efficiency.
Rainplus® allows the entire quantity rainwater to be directed to any part of the building, thus enabling the implementation of the most modern rainwater harvesting systems.
The harvesting and conservation of water are essential parameters to obtain the of Green Building marks.
The hydraulic principles of Rainplus® are therefore different from those of conventional drainage systems thus requiring a decidedly more advanced technical preparation in design and calculation as well as in system installation, since the accurate and proper design and installation of the hydraulic circuits has a direct influence on the performance of the entire siphonic system
This technology has many advantages; such as the significant reduction in costs and installation times, as well as an increase in the performance of the entire drainage system.
The Rainplus® siphonic system is made up of special roof outlets that are designed and tested according to American Standard ASME A112.6.9 and European Standard EN 1253.
These outlets are connected to Valsir HDPE pipes and fittings, which are sized in order to work under negative pressures, at high flow rates and with a full bore. This is possible thanks to the special configuration of the Rainplus® roof outlets, which prevent air from entering the pipes when the design rainfall intensity value is reached.In this way, the “hydraulic engine” of the system is generated by the height of the roof in relation to the drainage point and not by the amount of water accumulated on the roof.
The Rainplus® siphonic system is made up of roof outlets, pipe clamps and other clamping accessories, Valsir HDPE pipes and fittings, a software for 3D design and extremely professional computations.Valsir HDPE pipes and fittings are manufactured according to EN 1519 and have been approved to many standards worldwide (CSTB, IIP, KIWA, SKZ, ETA, Lloyd’s Register, etc.).
The light weight and wide range of pieces available make Valsir HDPE the ideal solution for the construction of siphonic drainage circuits.Valsir HDPE also offers great installation flexibility thanks to the various jointing methods, such as butt-welding and electrofusion.
CHARACTERISTICS OF EXCELLENCE
The advantages of Rainplus®
Cheap. When compared to conventional systems, Rainplus®requires a lower number of roof outlets and allows a substantial reduction in pipe diameters, in the number of fittings required and in the number of downpipes: this results in savings of up to 80% on vertical pipes and from 20% to 30% across the entire system.
Space saving. The roof outlets are connected to single horizontal collector pipes that are fitted without fall and the downpipes are positioned anywhere along the building perimeter, thus avoiding any interference.
High performance. When in operation drainage pipes flow at 100% over the entire system. Draining speed is therefore greater resultingin the self cleaning action of the pipework.
Sustainability. The ease in directing pipes to storage tanks makes the collection of rainwater easier for reuse in irrigation systems, fire ponds and tanks for non-potable uses.
Time and labour saving. Construction programmes are accelerated due to reduced installation times moreover. Less groundwork is required due to the reduced number of embedded pipes.
Increased design flexibility. Complete control over downpipe location and absence of embedded pipes causes increased design flexibility of the siphonic system.
The Valsir Rainplus® system and HDPE are produced with completely recyclable materials which can be recovered at the end of their useful life. The production processes employed are energy efficient and have reduced impact. Valsir has adopted the Green Building principles in terms of respect for the environment and conservation of resources, pipes and fittings are in fact certified by the prestigious Singapore Green Building.