RWP Siphonic Rainwater Systems
Our package comprises of design development, planning, system(s) integration, fabrication, installation and commissioning of all components to achieve an operational specification compliant siphonic roof drainage system.
We provide systems in the following pipework materials:
- HDPE (High Density Polyethylene)
- Stainless Steel
- Galvanised Steel
- Copper
- Aluminium
- Cast Iron
A conventional roof drainage system generally comprises individual open outlets connected to vertical down pipes that are designed to operate at
atmospheric pressure with a continuous air core. The discharge capacity of a conventional (or gravity) system is usually determined by the size of the outlets and the
depth of water above them. In the case of a gutter the allowable depth of water or driving head may be up to 100mm but on a flat roof it may be only 30mm.
A siphonic rainwater system draining a roof or roof gutter normally consists of a series of specially-designed, grated outlets connected by high
level lateral pipework to a vertical down pipe discharging into the ventilated surface water drainage system at or below ground level. All the pipe work is dimensioned
to flow full under specified rainfall conditions.
When compared to a conventional system an equivalent siphonic system can have a significantly higher capacity because, as the pipe work is enabled to flow full,
the driving (or hydraulic) head becomes equal to the vertical height between roof level and the point of discharge. In many buildings this will be 10 metres or more
which facilitates a high flow capacity that can be used to advantage in the drainage of a roof.
Testing:
All siphonic system pipe installations are air tested on completion according to BS EN 12056-3:2000. Alternatively where appropriate water testing may be carried out.
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