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The Treasury Building
Location: London, England
Architect: Fosters and Partners
Contractor: Bovis Lend Lease
Design Consultants: JB and B
Following an extensive refurbishment, the Treasury Building now benefits from a state-of-the-art self priming syphonic rainwater management system, designed, manufactured, supplied and installed by market-leading rainwater management specialists Fullflow Group.
Fullflow have worked with the architects Fosters and Partners before on many projects including the Hong Kong International Airport and they recommended our work to the contractors Bovis Lend Lease.
The Fullflow syphonic system was particularly appropriate for this job because design consultants JB and B specified that all rainwater had to drain into four new interceptors, with four down pipes - one for each interceptor. To achieve this with a conventional system would be virtually impossible as each gutter outlet needs a down pipe, and having only four outlets would seriously compromise the effectiveness of the system in storm conditions. Our self-priming syphonic system allows all the rainwater to be routed into four downpipes with an optimum level of control.
The Fullflow system works on the principles of negative pressure with water being literally pulled through the system. As it doesn't rely on gravity, water from any number of outlets can be sucked along horizontal mains to a predetermined number of down pipes. Using our design software "Primacalc" we can specify exact pipe diameters throughout the system to cope with ultimate specified rainfall intensities."
In this project we used 1500 metres of high density polyethylene piping, with a specified diameter of 50 mm at each outlet, up to a maximum of 200 mm at each discharge point. The project has 57 outlets at roof level, which are routed into four separate down pipes. Each system is specified to a rainfall intensity of 197 mm per hour maximum efficiency.
The brief required the majority of pipe work to be routed internally to maintain the external character of the building. We had to route the pipework under raised flooring within the building, and the fact that our system can work horizontally as well as vertically provided more flexibility, especially in view of the fact that some of the rooms were out of bounds and needed to be worked round.
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