1、|BRITISH STANDARD BS EN 1717:2000ICS 13.060.20; 91.140.60NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWProtection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflowIncorporating corrigendum July 2009T
2、his British Standard was published under the authority of the Standards Committee and comes into effect on 15 January 2001 BSI 2009BS EN 1717:2000National forewordThis British Standard is the UK implementation of EN 1717:2000.The UK participation in its preparation was entrusted by Technical Committ
3、ee B/504, Water supply, to Subcommittee B/504/4, Backflow prevention fittings.It should be noted that BS EN 1717:2000, (previously dated as BE EN1717:2001) does not align in its entirety with the United Kingdom water regulatory requirements, which are mandatory for all water installations within pre
4、mises in England, Wales, Scotland and Northern Ireland where water is supplied from a public source for domestic purposes.A list of organizations represented on this subcommittee can be obtained on request to its secretary.contract. Users are responsible for its correct application.Compliance with a
5、 British Standard immunity fromThe UK committee draws attention to the use of the terms “controllable“ and “non-controllable“. The UK committee would like to advise users that, in this Standard, the term “controllable“ refers to the ability to perform a test of function, and “non-controllable“ refer
6、s to the inability to perform a test of function. The terms “verifiable“ and “non-verifiable“ respectively represent more appropriate English usage.cannot conferlegal obligations.This publication does not purport to include all the necessary provisions of a Date 31 July 2009Comments ISBN 978 0 580 6
7、5644 6Amendments/corrigenda issued since publication Paragraph added in National foreword, and alignment of BSI and CEN publication datesEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1717November 2000ICS 13.060.20; 91.140.60English versionProtection against pollution of potable water in water in
8、stallationsand general requirements of devices to prevent pollution bybackflowProtection contre la pollution de leau potable dans lesrseaux intrieurs et exigences gnrales des dispositifs deprotection contre la pollution par retourSchutz des Trinkwassers vor Verunreinigungen inTrinkwasser-Installatio
9、nen und allgemeine Anforderungenan Sicherungseinrichtungen zur Verhtung vonTrinkwasserverunreinigungen durch RckflieenThis European Standard was approved by CEN on 20 January 2000.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
10、 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English
11、, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, De
12、nmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONC O M I T E U R OP E N D E N O R M A LI S A T I O NEUR O P IS C HES KOM I TE E FR NOR M UNGManagement Centre
13、: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1717:2000 E BSI 01-2001ContentsPageForeword 3Introduction . 31 Scope 42 Normative references. 43 Terms and definitions 44 Pollution of potable
14、 water: general observations . 64.1 Backflow of used water 64.2 Connection 64.3 External influences 74.4 Materials 74.5 Stagnation. 74.6 Harm caused by inadequate or improper maintenance 75 Analysis method of the risks at the point of use and choice of protection 75.1 General remarks . 75.2 Determin
15、ation of fluid categories which are or could be in contact withpotable water 85.3 Determination of the installation characteristics 95.4 Separation by single or double walls . 95.5 Air break to drain.105.6 Installation matrix105.7 Protection units .105.8 Matrix of the protection units appropriate to
16、 fluid categories.126 Point of use protection for equipment at the draw-off point for domesticuses 146.1 Choice of the protection units to be implemented .146.2 Location of the protection units.147 Point of use protection of particular equipment for non domestic uses148 Protection at the connection
17、point to the public potable water system.149 Air break to drain.15Annex A (normative) Reference list of the protection units 16Annex B (informative) Guide table for determining the fluid category from whichprotection is required .47Annex C (informative) Summary of the analysis method49Bibliography .
18、50BS EN 1717:2000 EN 1717:2000 BSI 01-2001ForewordThis European Standard has been prepared by Technical Committee CEN/TC 164, Water supply, theSecretariat of which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or b
19、y endorsement, at the latest by month of May 2001, and conflicting national standards shall bewithdrawn at the latest by May 2001.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria,
20、Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,Spain, Sweden, Switzerland and the United Kingdom.Annex A of this European Standard is normative, the Annexes B and C are informative.IntroductionIn respect of potent
21、ial adverse effects on the quality of water intended for human consumption, caused bythe products covered by this standard:1) this standard provides no information as to whether the products may be used without restriction in anyof the Member state of the EU or EFTA;2) it should be noted that, while
22、 awaiting the adoption of verifiable European criteria, existing nationalregulations concerning the use and/or the characteristics of these products remain in force.BS EN 1717:2000 EN 1717:2000 BSI 01-20011 ScopeThis standard deals with the means to be used to prevent the pollution of potable water
23、inside premises andthe 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 orappliances connected to the private supply system for water intended for human consumption.This st
24、andard 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, thisstandard is used as a reference in order to draw up a specification for the products out of new development.2
25、 Normative referencesThis 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 listedhereafter. For dated references, subsequent amendments to or revisions
26、 of any of these publications applyto this European standard only when incorporated in it by amendment or revision. For undated referencesthe latest edition of the publication referred to applies (including amendments).prEN 806, Specification for installations inside buildings conveying water for hu
27、man consumption.3 Terms and definitionsFor the purposes of this standard, the following terms and definitions apply.3.1air break to drainunobstructed 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 de
28、vice which collects this water3.2air gapphysical break between the lowest level of the water inlet and the maximum fault level or critical level of anappliance or installation, a feed pipe, or an air inlet orifice incorporated into a hydraulic circuit3.3air inletorifice designed to admit air from th
29、e atmosphere into a hydraulic circuit3.4appliance, equipmentdevice in which the potable water is used and/or is modified e.g. water heater, chemical dosing unit, coffee-machine, WC-pan3.5backflowmovement of the fluid from downstream to upstream within an installation3.6backflow protection devicedevi
30、ce which is intended to prevent contamination of potable water by backflow3.7contaminationresult of rendering impure by contact or mixture, to corrupt, defile, pollute, sully, taint or infectBS EN 1717:2000 EN 1717:2000 BSI 01-20013.8disconnectionbreak in a hydraulic circuit creating an atmospheric
31、area between two elements, one carrying or containingpotable water (upstream) and another carrying or containing another fluid (downstream)3.9domestic useany use related to residential or similar dwellings normal use for dwellings and homes, as well as hotels, schools and offices, communal residence
32、s, etc.(for example kitchen sink, wash and hand basin, bath, shower, WC, production of hot water for sanitarypurposes, domestic washing machine and dishwasher, bidet, watering of garden); special uses relating to similar consumers where products are used with low concentrations andpresenting no dang
33、er for human health (for example authorized water conditioning, air conditioning); in industrial and commercial premises “domestic use” is limited to water used for thoseapplications/appliances described under normal use in dwelling and homes (for example excludes waterused for process, fire fightin
34、g, central heating or irrigation systems).3.10downstreamthe side to which fluid flows under normal conditions3.11potable water systemwater system located downstream of the delivery point specified by the water supply authorities orregulations3.12family of protectiongeneral identification of a backfl
35、ow protection device principle3.13fluidall substances which can be deformed by small forces. Fluids are divided into liquids and gases3.14liquid levels3.14.1critical levelphysical or piezometric level of the liquid reached in any part of the appliance 2 s after closing the water inlet,starting from
36、maximum fault level3.14.2maximum operational levelin an open system, this is the maximum level of the liquid. In a pressurized system, this is the maximumpiezometric height possible3.14.3maximum fault levelthe highest physical or piezometric level of the liquid reached in any part of the appliance w
37、hen it operatescontinuously under fault conditions as described in product standard3.15LD50quantities of substances or mixture which, given on one intake through oral and parental path, bring aboutwithin 15 days (the required time to take into account potential delayed effect) the death of 50 out of
38、 100treated animalsBS EN 1717:2000 EN 1717:2000 BSI 01-20013.16non domestic useall uses related to a professional activity within industry, trade, agriculture, health establishments, etc. Alluses related to private and public swimming pools and public baths3.17overflowmeans for discharging naturally
39、 excess fluid from an appliance when it has reached a specified level3.18point of usepoint where water is drawn by the user either directly or by connecting an apparatus3.19pollution of potable waterany degradation of the quality of potable water3.20protection pointlocation in a hydraulic circuit wh
40、ere a protection unit is installed3.21protection unitdevice, or device in combination with other hydraulic components, which constitutes the protection againstbackflow3.22type of protectionidentified operating principle applied to a protection device belonging to a given family3.23upstreamside from
41、which fluid flows under normal conditions4 Pollution of potable water: general observationsWater installations, described in prEN 806, due to their design or construction, shall not be liable to generatepollution of public or private potable water supply system by residual matters, harmful water or
42、anyundesirable substance.4.1 Backflow of used waterThe quality of the water distributed can be impaired when used water flows back into the potable watersystem.4.2 ConnectionWhen there is a mixing of public potable water and any other water supply, the public water supply shall beprotected by an unr
43、estricted air gap.The non-potable or suspicious water distribution network shall be separated and the whole installationmarked (for example different coloured pipes). The non-potable or suspicious water taps shall have markingswith clearly visible warning signs.BS EN 1717:2000 EN 1717:2000 BSI 01-20
44、014.3 External influencesPotable water cisterns, pipes and protection units shall be protected from external pollution.No other fluid shall be conveyed in a potable water installation (gas, compressed air, ventilation conduct,vapour, chemicals, water used in heating equipment, recycled water, draina
45、ge or run-off water, waste water,etc.) than potable water.If it is considered possible that under the prescribed operation any contaminant could enter through theprotection device (for example air gap, air inlet) into the potable water installation, corresponding protectionmeasures are to be provide
46、d.4.4 MaterialsThe materials used in water installations, including the materials of protection units in contact with potablewater, shall satisfy the European Standards and national acceptance criteria and / or national restrictions foruse currently in force in EU and EFTA.They shall be compatible w
47、ith each other, with the water supplied, and with the fluids or substances that cancome into contact with them.4.5 StagnationA stagnation of water in the systems can result in impairment of the water quality due to a significantconcentration of dissolved substances or substances in suspension or to
48、bacterial growth.The level of impairment depends on the materials used, the water quality, the temperature (for examplepipes in boiler rooms) and the duration of stagnation.For reasons of hygiene, it is necessary that pipe systems are flushed after periods of stagnation.Pipes which are only used rar
49、ely or which are used for short periods shall be shut off after use and flushedbefore being brought back into service. Pipes that are no longer in use shall be disconnected from thepotable water system.4.6 Harm caused by inadequate or improper maintenanceAny insufficient or improper maintenance of the potable water installation including backflow protectiondevices can result in an impaired water quality. Regular maintenance of the prot
