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EN 1717:2025

Protection against pollution of water intended for human consumption in potable water installations and general requirements for devices to prevent pollution by backflow

Edition date: 2025-08-06
In Force
Available languages: German, English
Summary: This document specifies an analysing methodology for protecting potable water in potable water installations within and outside buildings but within premises from the risk of pollution by backflow of non-potable water and gives recommendations on the design, risk analysis, backflow prevention devices and their installation methods (see Figure 1 and Figure 2). This methodology is also intended to be used outside premises for all water systems connected to a potable water distribution system up to and including the point of use (see Figure 3). The product standards for the specific backflow prevention devices or arrangements are intended to be used in conjunction with this document. For the development of new devices or systems, this document is intended to be used as a reference to establish the necessary level of backflow protection.

Le présent document spécifie une méthode d’analyse pour la protection de l’eau potable dans des installations d’eau potable à l’intérieur et à l’extérieur des bâtiments, mais aussi dans les locaux, contre le risque de pollution par retour de l’eau non potable. Il donne également des recommandations sur la conception, l’analyse des risques, les dispositifs de protection contre les retours et leurs méthodes d’installation (voir Figures 1 et 2). Cette méthode est également destinée à être utilisée en dehors des locaux, dans tous les réseaux d’eau raccordés à un réseau de distribution d’eau potable jusqu’au point d’utilisation inclus (voir Figure 3). Les normes de produits concernant les dispositifs ou les systèmes de protection contre les retours spécifiques sont destinées à être utilisées conjointement avec le présent document. Pour le développement de nouveaux dispositifs ou systèmes, le présent document est destiné à être utilisé comme référence pour établir le niveau de protection sanitaire nécessaire.

Dieses Dokument legt eine Analysemethodik fest, um Trinkwasser in Trinkwasserinstallationen innerhalb und außerhalb von Gebäuden, aber innerhalb von Grundstücken vor dem Risiko von Verunreinigungen durch das Rückfließen von Nichttrinkwasser zu schützen. Es gibt Empfehlungen zur Konstruktion, zur Risikoanalyse, zu Sicherungseinrichtungen gegen Rückfließen und zu deren Einbauverfahren (siehe Bild 1 und Bild 2). Diese Methodik ist auch zur Anwendung außerhalb von Grundstücken bei allen Installationen gedacht, die mit einem Trinkwasser-Verteilungssystem verbunden sind, bis einschließlich der Entnahmestelle (siehe Bild 3). Es ist vorgesehen, die Produktnormen für die jeweiligen Armaturen oder Vorrichtungen zur Verhinderung des Rückfließens zusammen mit diesem Dokument zu verwenden. Bei der Entwicklung neuer Einrichtungen oder Systeme ist dieses Dokument dazu vorgesehen, als Referenz für die Ermittlung des erforderlichen Niveaus der Absicherung gegen Rückfließen zu dienen.
ICS: 23.060.01-Valves in general, 91.140.60-Water supply systems, 13.060.20-Drinking water
CTN: CEN/TC 164 - 6145

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