Wh 300 400 500 600 siphonic primary roof drain.
Siphonic roof drainage system.
Wh 301 401 501 601 siphonic overflow drain.
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.
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.
With a flat level design long horizontal runs above overhead ceilings are pos sible as shown in illustration 4.
Siphonic roof drainage is not so much a system in terms of a pre engineered product or package.
Unlike traditional roof drainage systems a siphonic system is designed to operate with the piping completely charged with water during a rainstorm.
Wade siphonic drainage design request.
The water is sucked or siphoned from the roof down into the drain at high velocity.
Despite what its name may suggest the process of syphonic drainage does not actually involve the syphoning of water at all.
Siphonic drainage systems operate with specially designed flat roof drains which unlike gravity drainage systems are configured to work with completely full pipes degree of fill h d 1 0.
This can only be achieved by assuring that no air is sucked in with the rain water and no bubble vortexes formed in the pipe system.
It is instead a technique of no pitch pipe design used to achieve desired flow from roof drains to point s of discharge.