bsen1717-2001protectionagainstpollutionofpotablewaterinwaterinstallationsandgeneralrequiremen

bsen1717-2001protectionagainstpollutionofpotablewaterinwaterinstallationsandgeneralrequiremen内容摘要：

Of Technology Tallaght, Institute of Technology, Tue May 08 10:39:47 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Scope This standard deals with the means to be used to prevent the pollution of potable water inside premises and the general requirements of protection devices to avoid pollution by backflow. The hygiene protection specifications of this standard are applicable to all the standards for systems or appliances connected to the private supply system for water intended for human consumption. This standard specifies the minimum requirements for product standards of protection units. The product standards are used to detail product specifications. In the absence of a product standard, this standard is used as a reference in order to draw up a specification for the products out of new development. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). prEN 806, Specification for installations inside buildings conveying water for human consumption. 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. air break to drain unobstructed distance between the low point of overflow, discharge or drain of a device or installation, leading from a water apparatus, and the top point of the device which collects this water air gap physical break between the lowest level of the water inlet and the maximum fault level or critical level of an appliance or installation, a feed pipe, or an air inlet orifice incorporated into a hydraulic circuit air inlet orifice designed to admit air from the atmosphere into a hydraulic circuit appliance, equipment device in which the potable water is used and/or is modified . water heater, chemical dosing unit, coffee machine, WCpan backflow movement of the fluid from downstream to upstream within an installation backflow protection device device which is intended to prevent contamination of potable water by backflow contamination result of rendering impure by contact or mixture, to corrupt, defile, pollute, sully, taint or infect Page 5 EN 1717:2020 169。 BSI 012020 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue May 08 10:39:47 GMT+00:00 2007, Uncontrolled Copy, (c) BSI disconnection break in a hydraulic circuit creating an atmospheric area between two elements, one carrying or containing potable water (upstream) and another carrying or containing another fluid (downstream) domestic use any use related to residential or similar dwellings  normal use for dwellings and homes, as well as hotels, schools and offices, munal residences, etc. (for example kitchen sink, wash and hand basin, bath, shower, WC, production of hot water for sanitary purposes, domestic washing machine and dishwasher, bidet, watering of garden)。  special uses relating to similar consumers where products are used with low concentrations and presenting no danger for human health (for example authorized water conditioning, air conditioning)。  in industrial and mercial premises “domestic use” is limited to water used for those applications/appliances described under normal use in dwelling and homes (for example exc ludes water used for process, fire fighting, central heating or irrigation systems). downstream the side to which fluid flows under normal conditions potable water system water system located downstream of the delivery point specified by the water supply authorities or regulations family of protection general identification of a backflow protection device principle fluid all substances which can be deformed by small forces. Fluids are divided into liquids and gases liquid levels critical level physical or piezometric level of the liquid reached in any part of the appliance 2 s after closing the water inlet, starting from maximum fault level maximum operational level in an open system, this is the maximum level of the liquid. In a pressurized system, this is the maximum piezometric height possible maximum fault level the highest physical or piezometric level of the liquid reached in any part of the appliance when it operates continuously under fault conditions as described in product standard LD50 quantities of substances or mixture which, given on one intake through oral and parental path, bring about within 15 days (the required time to take into account potential delayed effect) the death of 50 out of 100 treated animals Page 6 EN 1717:2020 169。 BSI 012020 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Tue May 08 10:39:47 GMT+00:00 2007, Uncontrolled Copy, (c) BSI non domestic use all uses related to a professional activity within industry, trade, agriculture, health establishments, etc. All uses related to private and public swimming pools and public baths overflow means for discharging naturally excess fluid from an appliance when it has reached a s。