R AINPLUS AND CONVENTIONAL SYSTEMS : A COMPARISON 1VALSIR S.p.A. – Ufficio Progettazione Impianti

Roof drainage systems  conventional ( or gravity*) roof drainage systems (air + water)  siphonic roof drainage systems (water only OR full bore flow) Siphonic systems are based on gravity effect too but this designation is used for an easy distinction. 2VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Roof drainage systems All roof drainage systems are made of:  roof outlets,  pipes and fittings,  clamps and accessories. 3VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Conventional roof drainage systems Conventional roof drainage systems are made of:  standard outlets,  one stack for each outlet,  stacks’ height equal to the building height. 4VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Conventional drainage systems Conventional roof drainage systems are made of :  Collectors buried in the ground (even inside the building),  sloped collectors,  Max stack water filling ratio 33%  Max collectors water filling ratio 70% 5VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Siphonic roof drainage systems Siphonic roof drainage systems are made of :  roof outlets with anti-vortex plate,  horizontal collectors installed under the soffit  One single downpipe for each circuit 6VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Siphonic roof drainage systems Siphonic roof drainage systems are made of :  Downpipes position freely definable (generally on the perimeter of the building,  Horizontal collectors (no slope required) 7VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Conventional roof drainage systems  The outlets of traditional roof drainage systems have no particular insert.  The water flows inside the pipes with a vortex and carrying air.  Pipelines work if appropriate volumes of air are allowed into the pipes. 8VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Siphonic roof drainage systems  In the syphonic systems the outlet is equipped with an anti-vortex plate preventing any air to go inside the pipes.  Pipelines work in a full bore scenario. 9VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Siphonic roof drainage systems  The full bore flow systems is based on the application of the Bernoulli principle.  This principle fixes a relationship between the velocity and the pressure of the water. 10VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage

Siphonic roof drainage systems 11VALSIR S.p.A. – Ufficio Progettazione Impianti  The engine of siphonic systems is the height of the circuit that generates negative pressure inside the pipes (vacuum).  Negative pressure siphons the water from the roof outlets. Negative pressure Rainplus The siphonic drainage

Siphonic systems advantages 12VALSIR S.p.A. – Ufficio Progettazione Impianti Economical  Minimization of the number of roof outlets,  Minimization of the pipes size,  Minimization of the number of downpipes.  Drastic reduction of materials quantities Space saving  Horizontal pipes without any slope,  The downpipes can be installed anywhereRainplus The siphonic drainage

Siphonic systems advantages 13VALSIR S.p.A. – Ufficio Progettazione Impianti High performance  Pipes are sized to work completely full of water,  high velocity of the water (up to 9m/sec)  the system is self cleaning. Eco-sustainable  This system makes the collection of rain water easy and economical (down pipes positioned in correspondence of water harvesting tanks)Rainplus The siphonic drainage

Siphonic system advantages 14VALSIR S.p.A. – Ufficio Progettazione Impianti Time and labour saving  Excavation works are minimized thus making the installations quicker.  Smaller pipes = quicker installations  Less material = quicker installations Great design flexibility  Down pipes can be installed anywhere in the building,  The drainage lines are not buried in the ground.Rainplus The siphonic drainage

Technical comparison 15VALSIR S.p.A. – Ufficio Progettazione Impianti Example  Roof area of 2500 m 2.  Rainfall intensity 108 mm/h.Rainplus The siphonic drainage

16VALSIR S.p.A. – Ufficio Progettazione Impianti Flow rate of l/s Rainplus The siphonic drainage Technical comparison Example  Roof area of 2500 m 2.  Rainfall intensity 108 mm/h.

17VALSIR S.p.A. – Ufficio Progettazione Impianti Flow rate of 37.5 l/sRainplus The siphonic drainage Technical comparison Example  Roof area of 2500 m 2.  Rainfall intensity 108 mm/h.

18VALSIR S.p.A. – Ufficio Progettazione Impianti De 90 De 200 De 110 De 125 De 110 De 250 Conventional system  Roof outlets: 14 x OD 90mm  Downpipes: 14 x OD 90mm  Side collectors: OD 110 – 200mm  Central collector: OD 125 – 250mmRainplus The siphonic drainage Technical comparison

19VALSIR S.p.A. – Ufficio Progettazione Impianti De 200 De 110 De 125 De 110 De 250 Conventional system  Pipe: 270 m  Fittings: 75 pcs  Cost: EUR De 90Rainplus The siphonic drainage

Technical comparison 20VALSIR S.p.A. – Ufficio Progettazione Impianti De 160 De 110 Siphonic system  Outlets: 9 (Rainplus )  Downpipes: 1 x OD 160  Side collectors: OD 90 – 110mm  Central collector: OD 110 – 125mm De 90 De 110 De 90 De 125 De 110Rainplus The siphonic drainage

Technical comparison 21VALSIR S.p.A. – Ufficio Progettazione Impianti De 160 De 110 Siphonic system  Pipes: 190 m  -30%  Fittings: 67 pcs  -11%  Cost: Euro  -29% De 90 De 110 De 90 De 125 De 110Rainplus The siphonic drainage

Technical comparison – figures ConventionalSiphonic Roof outlets149 Downpipes141 Side collectors size Central collector size Pipe quantity270m190m Fittings quantity75 pcs67 Cost € € VALSIR S.p.A. – Ufficio Progettazione ImpiantiRainplus The siphonic drainage Less labour + Less materials = less costs For a more efficient installation

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