Rain Plus features the most up to date technology in the building market and in rainwater drainage from the roofs of medium to large size buildings.
The system uses the building height as the driving force to generate high speed flow rates thus maximising drainage efficiency.
Rain Plus allows the entire flow of water to be directed to any part of the building whatsoever, thus enabling the most modern rainwater harvesting systems to be installed as required by the Green Building programs.
This technology offers numerous advantages, such as the significant reduction in cost and installation time as well as an increase in the performance of the entire drainage system.
The Rain Plus siphonic system is made up of special roof outlets that are designed and tested according to the 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 Rain Plus roof outlets, which prevent air entering the pipes when the design rainfall intensity value is reached. In this way the “hydraulic engine” of the system is given by the height of the roof in relation to the drainage point and not by the amount of water that has accumulated on the roof.
The hydraulic principles of Rain Plus are therefore different from those of conventional drainage systems thus requiring decidedly more advanced technical preparation in design and calculation as well as in system installation, in that the accurate and proper design and installation of the hydraulics circuits has a direct influence on the performance of the entire siphonic system.