EN 17821:2023

SLOVENSKI STANDARD
01-september-2023
Ventili v stavbah - Proti zmrzali odporne pipe za zunanjo uporabo (FRT) - Splošna
tehnična specifikacija
Building valves - Frost resistant taps for outdoor use (FRT) - General technical
specification
Frostbeständige Außenarmaturen für den Außenbereich - Allgemeine technische
Spezifikation
Robinetterie de bâtiment - Robinets résistant au gel pour une utilisation en extérieur
(FRT) - Spécifications techniques générales
Ta slovenski standard je istoveten z: EN 17821:2023
ICS:
23.060.01 Ventili na splošno Valves in general
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 17821
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2023
EUROPÄISCHE NORM
ICS 23.060.01; 91.140.60
English Version
Building valves - Frost resistant taps for outdoor use (FRT)
- General technical specification
Robinets résistant au gel pour une utilisation en Frostbeständige Außenarmaturen für den
extérieur - Spécifications techniques générales Außenbereich - Allgemeine technische Spezifikation
This European Standard was approved by CEN on 28 May 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 17821:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 5
3 Terms and definitions . 5
4 Materials . 6
4.1 General . 6
4.2 Dezincification resistant copper alloy . 6
4.3 Corrosion . 6
5 Characteristics . 7
5.1 Dimensions and Design . 7
5.2 Protection unit against backflow . 8
5.3 Resistance against to damage by frost. 8
5.4 Types of connection. 9
5.5 General tolerances . 9
6 Test methods and requirements . 9
6.1 Determination of automatic drainage . 9
6.2 Determination of resistance against damage by frost by controlled expansion .10
6.3 Leak tightness characteristics .11
6.4 Bending test .12
6.5 Torsion strength of control elements .14
6.6 Mechanical endurance characteristics of the operating mechanism .15
6.7 Resistance under internal pressure .16
6.8 Flow rate .18
6.9 Acoustic behaviour .18
7 Marking and technical product information .19
7.1 General .19
7.2 Marking .19
7.3 Technical product information .19
Annex A (informative) Tests and sampling.21
Bibliography .22

European foreword
This document (EN 17821:2023) 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 January 2024, and conflicting national standards shall
be withdrawn at the latest by January 2024.
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.
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.
1 Scope
This document specifies:
— general construction, performance and material requirements for Frost Resistant Taps for outdoor
use (FRT), PN 10.
— the application in the potable water installation with a static pressure of maximum 1,0 MPa (10 bar)
and a distribution temperature of maximum 25 °C (PWC).
FRT valves shall consist of the 3 areas shown in Figure 1.
The conditions of use are according to the following Table 1.

Key
1 indoor area
2 area in the wall
3 outdoor area
Figure 1 — The different areas of FRT
Table 1 — Conditions of use
Supply Dimension Operating Range
Pressure recommended limits
DN 15
Pressure static — max. ≤ 1,0 MPa (10,0 bar)
to
Pressure dynamic 0,1 to 0,5 MPa (1 to 5 bar) ≥ 0,05 MPa (0,5 bar)
DN 20
Temperature cold — PWC ≤ 25 °C
The requirements with regard to the potable water quality are specified in national regulations.
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 248:2002, Sanitary tapware - General specification for electrodeposited coatings of Ni-Cr
EN 1254 (all parts), Copper and copper alloys - Plumbing fittings
EN 1717, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflow
EN ISO 3822 (all parts), Acoustics - Laboratory tests on noise emission from appliances and equipment used
in water supply installations (ISO 3822 (all parts))
EN ISO 6509-1, Corrosion of metals and alloys - Determination of dezincification resistance of copper alloys
with zinc - Part 1: Test method (ISO 6509-1)
EN ISO 9227, Corrosion tests in artificial atmospheres - Salt spray tests (ISO 9227)
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1717 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
FRT
frost resistant tap for outdoor use defined by:
— method of achieving frost resistance (for example by drainage or by controlled expansion);
— pre-assembled or assembled on-site;
— fix and adjustable length;
— one or two outlets (shall be safe for every outlet)
3.2
PWC
potable water cold
Note 1 to entry: The temperature is not higher than 25 °C according to the European Potable Water Directive.
3.3
indoor area
area inside of the wall of the buildings
Note 1 to entry: The air temperature shall be higher than 0 °C.
3.4
area in the wall
wall of the building
Note 1 to entry: Locally, the temperature can be lower than 0 °C.
3.5
outdoor area
area in front of the wall of the buildings
4 Materials
4.1 General
The end connection in the indoor area (1) and the body in the front of the wall (3) – as indicated in
Figure 1 – shall be made of metallic materials.
All materials which coming into contact with water intended for human consumption shall present no
health risk nor cause any change to the water in terms of quality, appearance, smell or taste.
NOTE It is noted that while awaiting the adoption of verifiable European criteria for testing materials in contact
with water intended for human consumption, existing national regulations concerning the use and/or the
characteristics of these products remain in force.
4.2 Dezincification resistant copper alloy
Copper-zinc alloys containing more than 15 % zinc are subject to dezincification when submitted to
water capable of dezincification. In the countries where the use of products made of dezincification
resistant materials is required, the materials used shall guarantee a dezincification depth less than
200 µm in any direction. For this purpose, materials shall be tested in accordance with EN ISO 6509-1
and the product shall be marked in compliance with the indications according to Clause 7.
4.3 Corrosion
4.3.1 General
The applied materials shall be corrosion resistant or protected against corrosion. The materials used shall
not have an adverse effect on each other.
4.3.2 Corrosion resistance test
4.3.2.1 General
The purpose of the corrosion resistance test is to qualify all used materials of the external part of the FRT
(Figure 1, area 3), especially when used in a humid atmosphere where condensation water can occur. The
whole FRT shall be tested, not only the parts in contact with potable water, e.g. springs, spring caps, etc.
4.3.2.2 Test method
Samples shall be prepared for the corrosion resistance test as described as follows.
Carry out the test under the conditions described in EN ISO 9227 specifically for the neutral saline-spray
test, in the following way:
a) Subject the device to spraying for at least 100 h, interrupt the spraying treatment for (48 ± 1) h while
maintaining the heat in the tank and resume the spraying treatment for another (100 ± 1) h.
b) For the duration of the tests, the tank should only be opened to check and maintain the conditions,
the maximum rest period in spraying being 30 min per day. The heating should not be interrupted;
samples under test should not be handled, washed or checked.
c) After treatment and before visual examination, rinse the test samples in water to remove any salt
residue.
4.3.2.3 Requirements
Th
...