CEN/TC 164/WG 1 - External systems and components

This standard comprises: - general requirements for water supply systems outside buildings including potable water mains and service pipes, service reservoirs, other facilities and raw water mains but excluding treatment works and water resources development; - general requirements for components; - general requirements for inclusion in product standards which may include specifications which are more stringent; - requirements for installation, site testing and commissioning.

This standard specifies and gives guidance on: - general requirements for storage of water outside consumers' buildings, including service reservoirs for potable water and reservoirs containing water not for human consumption at intake works or within treatment works, excluding those that are part of the treatment process; - design; - general requirements for product standards; - requirements for checks, testing and commissioning; - operational requirements; requirements for rehabilitation and repair.

This document specifies and gives guidance on:
- general requirements for storage of water outside consumers' buildings, including service reservoirs for potable water and reservoirs containing water not for human consumption at intake works or within treatment works, excluding those that are part of the treatment process;
- design;
- general requirements for product standards;
- requirements for, quality control and auditing, testing and commissioning;
- operational requirements;
- requirements for inspection, rehabilitation and repair.
The requirements of this document are applicable to:
- the design and construction of new reservoirs;
- the extension and modification of existing reservoirs;
- significant rehabilitation of existing reservoirs.
NOTE 1 It is not intended that existing reservoirs are to be altered to comply with this document, provided that there
are no significant detrimental effects on water quality.
NOTE 2 This document does not apply to reservoirs formed by the building of dams or the use of lakes for water
storage purposes.

This document specifies:
-   general requirements for water supply systems outside buildings including potable water mains and service pipes, service reservoirs, other facilities and raw water mains but excluding treatment works and water resources development;
-   general requirements for components;
-   general requirements for inclusion in product standards which can include specifications which are more stringent;
-   general requirements for installation, site testing and commissioning.
The requirements of this document apply to:
-   the design and construction of new water supply systems;
-   the extension of significant areas forming a coherent part of an existing water supply system;
-   interconnections between water supply systems;
-   significant modification and/or rehabilitation of existing water supply systems.
NOTE   It is not intended that existing water supply systems are altered to comply with this document, provided that there are no significant detrimental effects on water quantity, security, reliability and adequacy of the supply. However, this document is intended to cover all water infrastructure systems mentioned above since they are key to meet the sustainable goals of the cities and to show the urgent need to invest in them in order to consider fundamental aspects, such as resilience or mitigation/adaptation to climate change.