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Pipe design, when done correctly, can minimise several problems including reducing the risk for water contamination by Legionella bacteria and other contaminants which can compromise water quality. Along with maintenance and the use of Showerhead Plus and water quality testing kits, proper pipe design can minimise the woes associated with running commercial, residential and even health care facilities.
In order to eliminate the guess work, it is crucial to have a thorough understanding of BS EN 806, particularly the design specifications outlined therein.
If you are using vented cold and hot water systems in your building, your storage cisterns should be fitted properly to ensure that they are airtight and to prevent the entry of both light and insects. It should also be properly insulated against both heat and cold.
In terms of storage capacity, the determination should factor in the prevention of stagnation as well as the individual requirements of appliances and fittings which ensure their optimal use.
BS EN 806 also outlines the minimum storage requirement for cold water for both domestic and commercial facilities. It is worth mentioning that the figures outlined in the document remain essentially the same as those contained in BS 6700. However, do note that such figures are merely for guidance only and outline the bare minimum.
Before making a final decision on the storage capacity of storage cisterns, it is best to consult your local supplier. Furthermore, if you operate a dwelling with a maximum capacity of 80 persons, it is advisable to opt for a storage cistern with a capacity of 130 persons as to minimise any inconvenience since refilling normally occurs during night time. 
Other important factors to consider include the use of appropriate materials, positioning, the use of water inlet control devices, water cistern outlets and warning and overflow pipes.
According to BS EN 806, materials made out of plastic, ductile cast iron, copper and copper alloys and other ferrous materials are suitable for use.
If water conditioning is to be implemented within a facility, it is also important to factor this in with respect to its effect on corrosion, scaling, filtration, suspended matter and chemical dosing.
The document also offers a simplified method for pipe sizing that can be used for cold and hot water pipes. Do take note that the recommendations do not apply to hot water return pipes. For this, it is best to turn to recommendations from manufacturers.
Plumbers and contractors should take great care to ensure that installations should not adversely affect water quality, the level of supply and the equipment of the water supplier during installations. The document also recommends the use of original manufacturer spare parts during installation.

+Duncan Hollis