Prevent positive air pressure transients in single stack drainage systems with Terrain P.A.P.A.® (positive air pressure attenuator) and the Pleura Vent System. It’s the easy way to control soil stack systems in multistorey or high-rise developments and complement the use of air admittance valves (AAVs).
Drainage Ventilation System
What is Terrain Drainage Ventilation System?
The Terrain P.A.P.A. is a positive air pressure attenuator, designed to mitigate the affects of
positive air fluctuations in the drainage pipework system. As water descends down the drainage stack it creates a negative pressure; if that flow is interrupted or is approaching a change of direction, the negative pressure changes to a positive pressure and moves up the pipe. This low amplitude air wave travels typically at 320m/s, the speed of sound.
As the positive air fluctuation approaches the branch-off point for the Terrain P.A.P.A., the bladder within the unit reacts very quickly, within 0.2 seconds, and starts to expand; this creates a pressure differential at the branch-off point. The branch to the Terrain P.A.P.A. then becomes the path of least resistance and the majority of the positive air pressure is absorbed within the unit.
As the transient air pressure within the pipework starts to equalise, the bladder slowly releases the small volume of air into the pipework system to only 12m/s which will have no effect on the trap seals.
Unmatched Venting System
✓ Offers a point-of-need solution that quickly responds to transient air fluctuations.
✓ Replaces extensive ventilation pipework, saving costs in material and installation.
✓ Allows more flexibility in the layout and design of internal drainage systems for engineers, architects and design professionals.
✓ Improved control and balancing of air pressures within the drainage pipework system
Terrain Pleura 50
The Terrain Pleura 50 air admittance valve provides ventilation to branch pipework. It is generally installed on the pipe behind the appliance trap water seal.
The Terrain Pleura 50 opens and admits fresh air into the branch pipe when the negative (suction) pressure occurs from an appliance discharging into the pipework system. This equalises the ambient air pressure within the pipework and protects the trap water seal. When the flow stops and the internal ambient air pressure in the pipework balances, the Terrain Pleura 50 closes by gravity and prevents foul air entering the built environment.
Terrain Pleura 100
The Terrain Pleura 100 air admittance valve can be fitted on to the top of a foul or waste stack, or at the end of long low gradient branch drains, to provide ventilation.
The Terrain Pleura 100 opens and admits fresh air under condition of reduced pressure in the discharge pipes and prevents trapped water seals being drawn. As the internal ambient air pressure in the pipework balances, the Terrain Pleura 100 closes by gravity and prevents foul air entering the built environment.
Discover more about the range: watch video
Polypipe Building Services has supplied a water management solution to one of the UK’s tallest residential complexes - Deansgate Square using Terrain P.A.P.A, Pleura Vent, Terrain FUZE and Terrain PVC Piping.