SIST EN 13077:2023

SLOVENSKI STANDARD
01-maj-2023
Nadomešča:
SIST EN 13077:2018
Naprave za varovanje pred onesnaženjem pitne vode zaradi povratnega toka -
Prosti iztok s prelivom nekrožne oblike (neoviran) - Družina A - Tip B
Devices to prevent pollution by backflow of potable water - Air gap with non-circular
overflow (unrestricted) - Family A - Type B
Sicherungseinrichtungen zum Schutz des Trinkwassers gegen Verschmutzung durch
Rückfließen - Freier Auslauf mit nicht kreisförmigem Überlauf (uneingeschränkt) - Familie
A - Typ B
Dispositifs de protection contre la pollution de l’eau potable par retour - Surverse avec
trop-plein non-circulaire (totale) - Famille A - Type B
Ta slovenski standard je istoveten z: EN 13077:2023
ICS:
13.060.20 Pitna voda Drinking water
23.060.99 Drugi ventili Other valves
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 13077
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2023
EUROPÄISCHE NORM
ICS 13.060.20 Supersedes EN 13077:2018
English Version
Devices to prevent pollution by backflow of potable water
- Air gap with non-circular overflow (unrestricted) -
Family A - Type B
Dispositifs de protection contre la pollution de l'eau Sicherungseinrichtungen zum Schutz des Trinkwassers
potable par retour - Surverse avec trop-plein non- gegen Verschmutzung durch Rückfließen - Freier
circulaire (totale) - Famille A - Type B Auslauf mit nicht kreisförmigem Überlauf
(uneingeschränkt) - Familie A - Typ B
This European Standard was approved by CEN on 23 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 13077:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Designation. 7
5 Symbolization . 7
6 Materials . 7
7 Requirements . 7
7.1 General . 7
7.2 Characteristics and tests . 8
7.2.1 General . 8
7.2.2 General tolerances and measurements . 8
7.2.3 Accuracy of measuring instruments . 8
7.2.4 Measurements . 8
7.3 Water inlet device . 8
7.4 Overflow arrangements .10
7.5 Air gap distance A.12
7.5.1 General .12
7.5.2 Single supply .12
7.5.3 Multiple supplies .13
7.5.4 Backflow/back pressure .13
7.6 Verification .13
7.6.1 Procedure for verification by test .13
7.6.2 Procedures for verification by calculation .14
8 Marking .15
9 Technical documents .15
Annex A (informative) Relationship between h and l for air gap Family A, Type B with
rectangular overflow .16
Annex B (normative) Vacuum Test .17
B.1 Apparatus .17
B.2 Procedure.17
B.3 Requirement .18

European foreword
This document (EN 13077:2023) 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 13077:2018.
The main changes compared to the previous edition are listed below:
a) terms and definitions have been amended;
b) Figure 1, Figure 4 and Figure 5 have been updated and redrawn;
c) Figure 6 has been added as an additional overflow arrangement;
d) the dimension D has been redefined;
e) 7.4 and 7.5 have been revised;
f) Annex B has been deleted.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
Introduction
With respect to potential adverse effects on the quality of water intended for human consumption, caused
by the product covered by this document:
a) this document 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 this product remain in force.
1 Scope
This document specifies the characteristics and the requirements of air gap with non-circular overflow
(unrestricted) Family A, Type B for nominal flow velocity not exceeding 3 m/s. Air gaps are devices for
protection of potable water in water installations from pollution by backflow. This document applies to
air gaps in factory-assembled products and to constructed air gaps in situ and specifies requirements and
methods to verify and ensure compliance with this document during normal working use.
The fluid in the receiving vessel is assumed to have similar properties to water. Where this is not the case,
additional care or tests could be required to verify the efficacy of the solution in practical use.
The AB device is intended to be used in potable water installations according to EN 806 (all parts).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 806-1, Specifications for installations inside buildings conveying water for human consumption - Part 1:
General
EN 806-5:2012, Specifications for installations inside buildings conveying water for human consumption -
Part 5: Operation and maintenance
EN 1717, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflow
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 806-1 and EN 1717 and the
following apply.
3.1
air gap with non-circular overflow (unrestricted) Family A, Type B
permanent and vertical distance between the lowest point of the inlet orifice and the critical water level
of the receiving vessel having an overflow which is non-circular in design
Note 1 to entry: See Figure 1 for the design principle.
a) Air gap with non-circular overflow b) Internal non-circular overflow arrangement
Key
1 Cw ≤ 20 mm
2 Ow ≥ 2D + h and never < 20 mm (single inlet)
Ow ≥ A + h and never < 20 mm (multiple inlets)
3 l ≥ 10 h
Figure 1 — Design principle
3.2
spillover level
level at which water will start to overflow the receiving vessel with all outlets closed
3.3
critical water 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 level
3.4
dimension h
height between the spillover level and the critical water level
Note 1 to entry: See 7.6 for measurement and calculation. For example, see Annex A.
3.5
maximum level
highest water level H reached above the spillover level with flow rate Q applied and all outlets closed
3.6
diameter of feed pipe outlet orifice (bore D)
internal diameter size of the outlet feed orifice (or calculated from the equivalent cross sectional area)
3.7
unrestricted
during fault condition, the water pathway to the overflow (of the receiving vessel) is not compromised
including through the overflow itself
4 Designation
An air gap with non-circular overflow (unrestricted) Family A, Type B is designated by:
— name;
— reference to this document, EN 13077;
— family and type;
— maximum permitted flow rate (Q).
EXAMPLE Air gap, EN 13077, Family A, Type B, 14 l/min.
5 Symbolization
The graphic representation of the air gap with non-circular overflow (unrestricted) Family A, Type B is
as follows (see Figure 2).
Figure 2 — Graphic symbol
6 Materials
All materials coming into contact with water intended for human consumption shall present no health
risk nor cause any change of the drinking water in terms of quality, appearances, smell or taste. All
materials shall be compatible among themselves and with the water supplied and with the fluids or
substances that can come into contact with them.
There are no special requirements concerning the materials downstream of the feed orifice provided they
do not have any harmful effect on the upstream part or the overflow arrangement.
7 Requirements
7.1 General
The protection assembly comprises three parts:
— water inlet device;
— receiving vessel (container);
— non-circular overflow.
7.2 Characteristics and tests
7.2.1 General
Performance tests shall be carried out on the device as installed in accordance with the manufacturer’s
technical documents. If not specified, all tests shall be performed with water at an ambient temperature.
7.2.2 General tolerances and measurements
— flow rate and pressure: ±2 % of the value specified;
— temperature: ±5 °C of the value specified;
+10
— time: % of the value specified.
−0
7.2.3 Accuracy of measuring instruments
All the measuring instruments shall have an error limit of ±2 % of the measured value.
7.2.4 Measurements
All measurements shall be in mm or l/min unless otherwise specified.
7.3 Water inlet device
Any device controlling the supply of water into a receiving vessel shall be securely attached to the vessel.
Every feed pipe supplying water to such a valve assembly or other device shall be fixed in its position to
prevent it from moving or buckling and to maintain a 2D radial clearance around the outlet. If a 2D with
a minimum of 20 mm clearance is not present, in addition to the air gap validation a vacuum test i
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