BS EN 806-2-2005 pdf download.Specification for installations inside buildings conveying water for human consumption — Part 2: Design.
12.2 Basic requirements
12.2.1 The type of protection device to be applied depends on the risks that may appear with the different methods of conditioning (see EN 1717).
12.2.2 The selection, design and the operating conditions of water conditioning equipment Inside buildings shall be adjusted to the water quality and pipeworks materials downstream. The materials used in the construction of water conditioning equipment shall be adequately resistant to all likely physical, chemical, microbiological and corrosive effects brought about by the water and the conditioning process itself.
12.2.3 The size and capacity of the equipment shall be selected as a function of the flow rate and shall be capable of peak flows, while not exceeding the maximum acceptable pressure drop allowed by the general configuration of the system and the available pressure at the point of entry.
12.2.4 When the equipment is out of service or disconnected, the continuity of the water supply shall be ensured, as far as necessary.
12.2.5 Sampling points should be available upstream and downstream of the equipment and at any other places relevant to the function of it.
12.2.6 Water conditioning equipment inside buildings shall operate up to the rated flow rate without producing disturbing noise (see EN 60534-8-4) and shall not produce excessive pressure surges.
12.2.7 Parts of the equipment subjected to hydrostatic pressure shall be rated for a test pressure of the potable water installation.
12.2.8 Water Conditioning equipment inside buildings shall only be selected, sized and installed by designers and installers.
12.2.9 Equipment for water conditioning inside buildings shall not result in excessive use or waste of water.
12.2.10 The Installation of water conditioning equipment inside buildings is intended to prevent corrosion or scaling, it should not compensate for wrong design of the system or unsuitable materials. Whenever practical the replacement of the wrong material andlor the improvement of the design shall be considered first.
12.2.11 Where the water conditioning apparatus involves a phase of effluent draining off or is equipped with an overflow, a disconnection device including an air gap shall be installed. See EN 1717.
12.2.12 Adequate facilities shall be provided to allow for drainage of the maximum flow rate necessary for the cleaning, rinsing, complete emptying and possible overflow the water
12.2.13 Where water conditioning equipment is located in a separate room, the room shall be clean, kept above freezing and shall be accessible only by authorised personnel, except in domestic premises.
Systems except fire fighting installations shall be designed to ensure, that the generation of noise is minimized and that local or national regulations are fulfilled.
13.2 Pipework
13.2.1 Pipework shall be positioned so that any noise generated within them will create the minimum acceptable annoyance. Pipework should be adequately supported so that they are not in direct contact with the stwcture.
13.2.2 Preferably flexible vibration-isolating clips or brackets shall be used. Pipes shall not be rigidly fixed to lightweight panels.
13.2.3 Noise caused by movement of pipes in hot water systems as a result of temperature changes may be reduced by the use of resilient pipe clips or resilient pads between pipes and pipe clips. Expansion loops 04’ a suitable alternative shall be used for long straight lengths of pipe to facilitate pipe movement.
13.3 Components
Noise and vibration transmitted from pumps and other equipment shall be minimized to an acceptable level.
Laboratory test methods on noise emission from appliances and equipment are described in EN ISO 3822-1 to -4.
National regulations for maximum noise level and test methods should be taken into account.
14 Protection of systems against temperatures external to pipes, fittings and appliances
14.1 Freezing
14.1.1 Location of pipes, fittings and appliances
The design of potable water installations should be planned to avoid the following:
a) external situations above ground;
b) an unheated part of the roof space;
C) an unheated cellar or under floor space;
d) any other unheated part of the building, unheated stairwells or lift shafts or any outhouse or garage;
e) positions near a window, airbrick or other ventilator, external door or any other place where cold draughts are likely to occur;
f) chase or duct formed in an external wall external to any insulation.BS EN 806-2-2005 pdf download.