EN 12729:2023
(Main)Devices to prevent pollution by backflow of potable water - Controllable backflow preventer with reduced pressure zone - Family B - Type A
Devices to prevent pollution by backflow of potable water - Controllable backflow preventer with reduced pressure zone - Family B - Type A
This document specifies the field of application, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of controllable backflow preventers with reduced pressure zone, Family B, Type A.
This document covers controllable backflow preventers of Family B, Type A, with reduced pressure zones, intended to prevent pollution of potable water by backflow, caused by backsiphonage or by backpressure.
It is applicable to controllable backflow preventers in denominations DN 6 up to DN 250.
It covers controllable backflow preventers of PN 10 that are capable of working without modification or adjustment:
- at any pressure, up to 1 MPa (10 bar);
- with any pressure variation, up to 1 MPa (10 bar);
- in permanent duty at a limited temperature of 65 °C and for maximum 1 h at 90 °C.
It specifies also the test methods and requirements for verifying their characteristics, the marking and the presentation at delivery.
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch Rückfließen - Systemtrenner mit kontrollierbarer druckreduzierter Zone - Familie B - Typ A
Dieses Dokument legt den Anwendungsbereich, die maßlichen und physikalisch-chemischen Anforderungen, die Anforderungen an die Konstruktion, die hydraulischen, mechanischen und akustischen Anforderungen für Systemtrenner mit kontrollierbarer druckreduzierter Zone, Familie B, Typ A, fest.
Dieses Dokument ist anzuwenden für Systemtrenner mit kontrollierbarer druckreduzierter Zone, Familie B, Typ A, die verhindern sollen, dass durch Rücksaugen oder Rückdrücken Wasser zurückfließt und dadurch Trinkwasser verschmutzt wird.
Es ist anzuwenden für Systemtrenner der Nennweiten DN 6 bis DN 250.
Es ist anzuwenden für Systemtrenner mit einem Nenndruck PN 10, die ohne Abänderung oder Nachstellung arbeiten:
— bei jedem Druck bis 1 MPa (10 bar);
— bei jeder Druckschwankung bis 1 MPa (10 bar);
— unter Dauerbelastung bei einer Grenztemperatur von 65 °C und für maximal 1 h bei 90 °C.
Die Norm enthält ferner Festlegungen für die Prüfverfahren und Anforderungen zum Nachweis dieser Eigenschaften, die Kennzeichnung und den Lieferzustand.
Dispositifs de protection contre la pollution de l'eau potable - Disconnecteur à zone de pression réduite contrôlable - Famille B - Type A
Le présent document spécifie le domaine d'application, les caractéristiques dimensionnelles, physico chimiques, de conception hydrauliques, mécaniques et acoustiques de disconnecteurs à zone de pression réduite contrôlable de Famille B, Type A.
Le présent document s’applique aux disconnecteurs de Famille B, Type A à zone de pression réduite contrôlable, destinés à empêcher la pollution de l’eau potable par retour d'une eau par contre-pression ou siphonnage.
Il est applicable aux disconnecteurs contrôlables de dénomination DN 6 à DN 250.
Il s’applique aux disconnecteurs contrôlables de PN 10 qui doivent pouvoir fonctionner sans modification ni réglage :
- à toute pression, jusqu'à 1 MPa (10 bar) ;
- pour toute variation de pression, jusqu'à 1 MPa (10 bar) ;
- en service continu à une température limite de 65 °C et pendant 1 h au maximum à 90 °C.
Il spécifie également les méthodes d’essai et les exigences pour vérifier leurs caractéristiques, le marquage et la présentation à la livraison.
Naprave za varovanje pred onesnaženjem pitne vode zaradi povratnega toka - Sistemski ločevalnik z nadzorovanim območjem znižanega tlaka - Družina B - Tip A
Ta dokument določa področje uporabe, dimenzijske, fizikalno-kemijske, konstrukcijske, hidravlične, mehanske in akustične lastnosti preprečevalnikov povratnega toka s funkcijo krmiljenja z zmanjšanim tlačnim območjem družine B, tip A.
Ta dokument zajema preprečevalnike povratnega toka s funkcijo krmiljenja družine B, tip A z zmanjšanimi tlačnimi območji, ki so namenjeni preprečevanju onesnaženja pitne vode zaradi povratnega toka, ki je posledica povratnega vodnega udara ali povratnega tlaka.
Uporablja se za preprečevalnike povratnega toka s funkcijo krmiljenja z oznakami od DN 6 do DN 250.
Ta dokument zajema preprečevalnike povratnega toka PN 10, ki lahko delujejo brez spreminjanja ali prilagajanja:
– pri poljubnem tlaku do 1 MPa (10 bar);
– pri poljubnem nihanju tlaka do 1 MPa (10 bar);
– pri trajnem obratovanju pri mejni temperaturi 65 °C in največ 1 uro pri 90 °C.
Določa tudi preskusne metode in zahteve za preverjanje njihovih lastnosti, označevanje in predstavitev ob dobavi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2023
Nadomešča:
SIST EN 12729:2003
Naprave za varovanje pred onesnaženjem pitne vode zaradi povratnega toka -
Sistemski ločevalnik z nadzorovanim območjem znižanega tlaka - Družina B - Tip
A
Devices to prevent pollution by backflow of potable water - Controllable backflow
preventer with reduced pressure zone - Family B - Type A
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch
Rückfließen - Systemtrenner mit kontrollierbarer druckreduzierter Zone - Familie B - Typ
A
Dispositifs de protection contre la pollution de l'eau potable - Disconnecteur à zone de
pression réduite contrôlable - Famille B - Type A
Ta slovenski standard je istoveten z: EN 12729:2023
ICS:
13.060.20 Pitna voda Drinking water
91.140.60 Sistemi za oskrbo z vodo Water supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12729
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2023
EUROPÄISCHE NORM
ICS 13.060.20; 91.140.60 Supersedes EN 12729:2002
English Version
Devices to prevent pollution by backflow of potable water
- Controllable backflow preventer with reduced pressure
zone - Family B - Type A
Dispositifs de protection contre la pollution de l'eau Sicherungseinrichtungen zum Schutz des Trinkwassers
potable - Disconnecteur à zone de pression réduite gegen Verschmutzung durch Rückfließen -
contrôlable - Famille B - Type A Systemtrenner mit kontrollierbarer druckreduzierter
Zone - Familie B - Typ A
This European Standard was approved by CEN on 30 January 2023.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12729:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Denomination . 9
5 Designation. 9
6 Symbolization . 10
7 Physico-chemical characteristics . 10
7.1 General . 10
7.2 Materials . 10
7.2.1 General . 10
7.2.2 Dezincification resistant copper alloy . 10
7.3 Surface coating . 11
7.3.1 General . 11
7.3.2 Epoxy coating . 11
7.3.3 Polyamide powder based coating . 11
8 Design . 11
8.1 General . 11
8.2 Relief valve . 12
9 Characteristics and tests . 13
9.1 General . 13
9.2 General tolerances . 13
9.2.1 Tolerance of set parameters . 13
9.2.2 Accuracy of measuring instruments . 13
9.3 Dimensional characteristics. 13
9.3.1 Connections . 13
9.3.2 Pressure taps . 13
9.4 Mechanical characteristics . 14
9.4.1 General . 14
9.4.2 Mechanical resistance of the body under pressure . 14
9.4.3 Endurance . 14
9.4.4 Torque test of captive rotating nuts and bending strength – tightness of the body . 16
9.4.5 Reliability of stop valves fitted to test ports . 17
9.5 Tightness characteristics . 18
9.5.1 Verification of the tightness of the downstream check valve (in the closing direction) . 18
9.5.2 Verification of the closing pressure of the downstream check valve and its tightness
(opening direction) . 18
9.5.3 Verification of the tightness of the upstream check valve at low pressure . 19
9.5.4 Verification of the tightness of the upstream check-valve under vacuum . 20
9.6 Hydraulic characteristics . 21
9.6.1 Test rig – General circuit . 21
9.6.2 Verification of the pressure loss as a function of the flow rate . 22
9.6.3 Verification of the pressure difference between the upstream and the intermediate
zones . 22
9.6.4 Verification of venting to atmospheric pressure of the intermediate zone when the
upstream pressure drops . 23
9.6.5 Verification of opening start of the relief valve and of its closing . 23
9.6.6 Verification of the relief valve tightness in case of fluctuation of the upstream
pressure . 24
9.6.7 Verification of the intermediate zone pressure for a given relief flow rate under
inverse feed . 24
9.7 Compatibility with the products used for shock disinfection of the networks . 25
9.7.1 Requirement . 25
9.7.2 Test method . 25
9.8 Acoustic tests . 25
9.8.1 General . 25
9.8.2 Procedure . 26
10 Marking and technical documents . 26
10.1 Marking . 26
10.2 Technical documents . 27
11 Presentation at delivery . 27
Annex A (normative) General information for coating definition . 28
A.1 Organic coating (paint) . 28
A.2 Pre-treatment before coating. 28
A.3 Application techniques . 28
Annex B (normative) Evaluation of the degree of polymerization . 30
B.1 Solvent resistance test . 30
Bibliography . 32
European foreword
This document (EN 12729:2023) 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 September 2023, and conflicting national standards
shall be withdrawn at the latest by September 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12729:2002.
The main changes compared to the previous edition are listed below:
— hydraulic and mechanical requirements have been revised;
— the Scope has been updated;
— all tests have been described in more detail and optimized;
— acoustics have been updated;
— endurance tests have been revised;
— se
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.