How Do Siphonic Roof Drains Work

The hydromax drain outlet is designed so that as soon as the rainwater reaches the hallow deth to the underside of the inducer plate the unique inducer prevents air ingress into the pipework as a first step towards making the system run.

How do siphonic roof drains work. This pump requires no external power as it is activated by rainfall filling the drain beyond its anti vortex plate at which point air flow to the pipe is cut off. A constituent part of the hydromax siphonic system is the special hydromax siphonic roof drain. In principle syphonic drainage is a very simple process. Baffle and prevents air and debris from entering the piping system at full flow allowing the pipes to completely fill up with water.

Despite what its name may suggest the process of syphonic drainage does not actually involve the syphoning of water at all. Unlike traditional roof drainage which is designed to flow part full a syphonic system operates at full capacity when water is sucked or syphoned from the roof down into the drain at high velocity. Activated by rainfall filling the drain above its anti vortex plate air flow to the pipe is then cut off the natural gravitational flow vacuums water horizontally away from the roof structure pumping rainfall towards a single downpipe to an end point of your choice. A hydromax siphonic roof drainage system utilises the full height of the building to provide the energy to create a powerful siphonic action.

Instead syphonic drainage technology employs the use of a gravity induced vacuum pump to remove water at high velocity from multiple roof drains at once. Several of these drains tie into a horizontal collector that is routed to a convenient point where it transitions into a vertical downpipe. The water is sucked or siphoned from the roof down into the drain at high velocity. However that isn t always enough.

Siphonic drainage is actually very simple in principle and all systems work in exactly the same. A siphonic roof drain has a special insert that acts as an air baffle and anti vortex vane such that only water is drawn off of the roof not air. So interior drains can be used in combination with scuppers which drain water at the edge of the roof. Baffle plates inserted in the outlets restrict air entering the top of the system which when combined with carefully sized pipework causes the system horizontal and vertical to run full.

By contrast a fully engineered siphonic roof drainage system contains an anti vortex plate that acts as a. Interior drains work best when the roof is sloped to allow water to gather at the drainage point. Those roofs benefit from siphonic drainage systems.