1、BRITISH STANDARDBS EN 14452:2005Devices to prevent pollution by backflow of potable water Pipe interrupter with atmospheric vent and moving element DN 10 to DN 20 Family D, type BThe European Standard EN 14452:2005 has the status of a British StandardICS 13.060.20; 23.060.50g49g50g3g38g50g51g60g44g4
2、9g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14452:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29
3、December 2006 BSI 2006ISBN 0 580 49769 0National forewordThis British Standard was published by BSI. It is the UK implementation of EN 14452:2005.The UK participation in its preparation was entrusted by Technical Committee B/505, Wastewater engineering, to Subcommittee B/505/4, Manhole covers, surfa
4、ce boxes and other road fittings.A list of organizations represented on B/505/4 can be obtained on request to its secretary.BSI Technical Committee B/504 would like to draw the users attention to 10.10.1, which in the opinion of the Committee should read: “For this test the membrane of the device sh
5、all be cut off as indicated in Figure 2. For further details of the procedure see 10.4.”This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obli
6、gations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14452May 2005ICS 13.060.20; 23.060.50English versionDevices to prevent pollution by backflow of potable water - Pipeinterrupter with atmospheric vent and moving element DN 10 toDN 20 -
7、Family D, type BDispositifs de protection contre la pollution de leau potablepar retour - Rupteur vent atmosphrique avec lmentmobile DN 10 DN 20 - Famille D, type BSicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rckflieen -Rohrunterbrecher mit Lufteintrittsffnung und bew
8、eglichemTeil, DN 10 bis DN 20 - Familie D, Typ BThis European Standard was approved by CEN on 24 December 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alter
9、ation. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translat
10、ionunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary,
11、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart
12、, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14452:2005: EEN 14452:2005 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 Nominal sizes.6 5 Desi
13、gnation 6 6 Marking and technical documents.7 7 Symbolisation 8 8 General design characteristics 8 9 Physico-chemical characteristics9 10 Characteristics and tests 9 11 Acoustic characteristics .15 Annex A (normative) Sampling and test sequence16 EN 14452:2005 (E) 3 Foreword This document (EN 14452:
14、2005) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2005, and conflicting
15、national standards shall be withdrawn at the latest by November 2005. This document has been worked out in reference with EN 1717 “Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow“. According to the CEN/CENELEC
16、Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Den-mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-bourg, Malta,
17、 Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 14452:2005 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this document: a) this document
18、 provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of th
19、is product remain in force. EN 14452:2005 (E) 5 1 Scope This document specifies: a) field of application; b) requirements for pipe interrupters with atmospheric vent and moving element; c) dimensional and the physico-chemical properties, and the properties of general hydraulic, mechanical and acoust
20、ic design of pipe interrupters with elastic membrane of DN 10 to DN 20; d) test procedure and requirements for verifying these properties; e) marking and presentation; f) acoustics. This document specifies the characteristics of pipe interrupters with atmospheric vent and moving element, DN 10 to DN
21、 20 that are suitable for use in drinking water systems at pressures up to 1 MPa (10 bar) and temperatures up to 65 C and for 1 h at 90 C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited a
22、pplies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 806-1:2000, Specification for installations inside buildings conveying water for human consumption Part 1: General EN 1717:2000, Protection against pollution of potable water in water
23、 installations and general requirements of devices to prevent pollution by backflow EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) EN ISO 3822-1, Acoustics Laboratory tests on noise emission from appl
24、iances and equipment used in water supply installations Part 1: Method of measurement (ISO 3822-1:1999) EN ISO 3822-3, Acoustics Laboratory tests on noise emission from appliances and equipment used in water supply installations Part 3: Mounting and operating conditions for in-line valves and applia
25、nces (ISO 38223:1997) EN ISO 3822-4, Acoustics Laboratory tests on noise emission from appliances and equipment used in water supply installations Part 4: Mounting and operating conditions for special appliances (ISO 3822-4:1997) EN ISO 5167-1, Measurement of fluid flow by means of pressure differen
26、tial devices inserted in circular cross-section conduits running full - Part 1: General principles and requirements (ISO 5167-1:2003) EN ISO 6509, Corrosion of metals and alloys Determination of dezincification resistance of brass (ISO 6509:1981) ISO 7-1, Pipe threads where pressure-tight joints are
27、 made on the threads Part 1: Dimensions, tolerances and designation ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests EN 14452:2005 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1717:2000, EN 806-1:2000 and the following app
28、ly. pipe interrupter with atmospheric vent and moving element pipe interrupter with elastic membrane, fitted with air inlet port(s) which is (are) closed, when water flows through it above atmospheric pressure, but which opens (open) to admit air if there is a subatmospheric pres-sure at the water i
29、nlet or when the flow stops, and close to be watertight when the flow of water is resumed at normal pressure. It ensures protection against back siphonage only by draining to the atmosphere, but not against back pressure. Direction of water flow is vertically downwards. For the purpose of this docum
30、ent “pipe interrupter with atmospheric vent and moving element DB” is hereafter referred to as “device(s)“ 4 Nominal size The nominal size of the device shall correspond to the denomination of the thread according to Table 1, EN ISO 228-1 or ISO 7-1. Table 1 Nominal size vs union end thread size DN
31、10 15 20 Thread size 38 5 Designation The devices are designated by: a) name; b) reference to this document (EN 14452); c) family, type; d) nominal size (DN); e) body material; f) acoustic group. Example of designation: Pipe interrupter EN 14452, family D, type B, DN 20, gun metal, . EN 14452:2005 (
32、E) 7 6 Marking and technical documents 6.1 General In countries where the use of products made of dezincification resistant materials is not required, the dezincifi-cation resistant products according to EN ISO 6509, as well as the products which do not contain zinc, may be marked “DR“. In countries
33、 where the use of dezincification resistant materials is required, the dezincification resistant prod-ucts, as well as the products which do not contain zinc, shall be marked “DR“. 6.2 Marking The devices shall be marked permanently and visibly on the casing, or on a fixed data plate. This informati
34、on shall be on the upper side, or on each lateral side of the device. The indications shall be in-delible and obtained by moulding, engraving or similar procedures. The marking shall indicate: a) name, manufacturers brand or logo; b) arrow indicating normal direction of flow; c) nominal size (DN); d
35、) acoustic group; Marking a), b), c), are obligatory. In case there is no marking for d), the device shall be considered as not classified acoustically. 6.3 Technical documents Each package and/or each batch and/or each catalogue of the supplier/manufacturer shall contain technical product informati
36、on which shall be written in a commonly spoken language of the country in which the product is sold. It shall provide the following information: a) designation and purpose of the product; b) installation instructions; c) minimum installation height; d) (brand) name and address of supplier/manufactur
37、er; e) instructions for maintenance, if any; f) spare part list, if any. EN 14452:2005 (E) 8 7 Symbolisation The graphic representation of the device is as follows (see Figure 1). Figure 1 Graphic symbol 8 General design characteristics 8.1 Design principle A typical design principle of DB device is
38、 given in Figure 2. Dimensions in millimetres Key 1 Vacuum back siphonage condition 2 Air 3 Water inlet 4 Slit of the support part 5 Water outlet 6 Cut off line for 10.10 vacuum test 7 Membrane Figure 2 Design principle 8.2 Connections Connections shall comply with EN ISO 228 or ISO 7-1. EN 14452:20
39、05 (E) 9 8.3 Replacement of internal parts Internal parts of devices have to be designed so that replacement can be carried out easily. 9 Physico-chemical characteristics 9.1 Materials The materials and the coatings used, liable to come normally or accidentally in contact with potable water, shall s
40、atisfy the EU regulations concerning water quality. The materials and the coatings shall be: a) corrosion resistant in accordance with ISO 9227; b) prone to the least scaling possible; c) in conformity with the associated standards and regulations; d) compatible among themselves and with: the water
41、distributed; the fluids or matter liable to come into contact with them; the products normally used for disinfection operations of the network: potassium permanganate and sodium hypochlorite. 9.2 Nature of materials The choice of materials is left to the discretion of the manufacturer; a) Copper-zin
42、c alloys containing more than 10 % zinc are subject to denzincification when submitted to water capable of dezincification. In the countries where the use of products made of dezincification resistant materials is required, the products shall guarantee a dezincification depth less than 200 m in any
43、direction, they shall be tested in accordance with EN ISO 6509 and shall be marked in compliance with the indications in Clause 6. b) Neither the materials nor coatings used shall, by normal or accidental contact with drinking water, cause any risk of affecting or modifying the water up to a tempera
44、ture of 90 C. The suitability of the water for human consumption is defined by national regulations. c) The manufacturer shall state in his technical and sales literature the nature of the materials and the coat-ings selected. d) The materials, and in particular copper alloys, for which recommendati
45、ons or standards exist, shall com-ply with the relevant recommendations or standards. 10 Characteristics and tests 10.1 General Examples shown in the figures are for guidance only. Laboratory equipment shall be designed to ensure that the devices can be tested in accordance with the requirements. EN
46、 14452:2005 (E) 10 The accuracy of measurements and accuracy of measuring instruments shall not exceed the following: a) Accuracy of measurements In the absence of any particular specifications: flow rate and pressure: 2 % of the value indicated; temperature: cold water 5 C of the value indicated; h
47、ot water 2 C of the value indicated; time: %100+of the value indicated; b) Accuracy of measuring instruments Measuring instruments shall have a precision of 2 % of the measured value. Temperature measure-ments shall be accurate to 1 K. 10.2 Test sequence Three samples have to be submitted. The test
48、sequence is specified in Annex A. Stage 1 Visual verification. See 10.3; Stage 2 Vacuum. See 10.4; Stage 3 Flow rate/pressure loss. See 10.5; Stage 4 Bending moment, mechanical strength of body and leak tightness. See 10.6; Stage 5 Vacuum. See 10.7; Stage 6 Endurance. See 10.8; Stage 7 Vacuum. See 1
49、0.9; Stage 8 Vacuum without membrane. See 10.10. 10.3 Visual verification (Stage 1) Check by visual verification that: a) the devices conform to the description and the appropriate drawings; b) the requirements to EN 1717 are met; c) the following dimensional requirements on air inlets are met: Air inlets shall be shrouded and designed to ensure that they cannot easily be blocked by deposits. All air passages relating to air inlets shall have a width of not less than 4 mm at any point, with the exception of
