Copper and copper alloys - Plumbing fittings - Part 4: Threaded fittings

This document specifies product characteristics, assessment methods, compliance criteria of the test results and a designation system for threaded fittings. These threaded ends exist with metallic and with non-metallic sealing elements for the purposes of joining with tubes, pipes, fittings or valves, the threaded ends have a size range from 3,175 mm (1/8") to 101,6 mm (4"). The threaded fittings are designed for a service lifetime up to fifty years.
The fittings are used up to the operating temperatures and corresponding maximum operating pressures as indicated in Annex A.
This document applies to copper alloy fittings. A non-exhaustive list of these copper alloys is given in CEN/TS 13388.
Threaded fittings may also have flanged end connections according to EN 1092-3.
Threaded fittings may also have a plated or other decorative surface coating.
Fittings can be produced by machining, metal forming, casting, or fabrication.
Products covered by this document are intended to be used in:
a) liquid applications:
- hot, cold or combined hot and cold water, includingsystems according to EN 806;
- closed heating systems according to EN 12828;
- cooling systems;
- drainage systems;
- fire protection systems including sprinkler systems according to EN 12845.
b) gas applications:
- natural gas and liquefied petroleum gas systems with a maximum operating pressure less than or equal to 5 bar according to EN 1775;
- compressed air systems.

Kupfer und Kupferlegierungen - Fittings - Teil 4: Gewindefittings

Dieses Dokument legt Produkteigenschaften, Bewertungsverfahren, Übereinstimmungskriterien der Prüfergebnisse und ein Bezeichnungssystem für Gewindefittings fest. Diese Gewindeenden gibt es mit metallischen und mit nichtmetallischen Dichtelementen zum Verbinden mit Rohren, Formstücken oder Ventilen, die Gewindeenden haben einen Größenbereich von 3,175 mm (1/8”) bis 101,6 mm (4”). Die Gewindefittings sind für eine Lebensdauer von bis zu fünfzig Jahren ausgelegt.
Die Fittings werden bis zu den in Anhang A angegebenen Betriebstemperaturen und entsprechenden maximalen Betriebsdrücken eingesetzt.
Dieses Dokument ist anzuwenden für Fittings aus Kupferlegierungen. Eine nicht vollständige Liste dieser Kupferlegierungen ist in CEN/TS 13388 enthalten.
Gewindefittings dürfen auch Flanschendanschlüsse nach EN 1092 3 aufweisen.
Gewindefittings dürfen auch galvanische oder andere dekorative Oberflächenüberzüge aufweisen.
Fittings können durch maschinelles Bearbeiten, Umformen, Gießen oder Fügen von Vormaterial hergestellt werden.
Die unter dieses Dokument fallenden Produkte sind für den Einsatz bestimmt in:
a)   Flüssigkeitsanwendungen:
—   warmes, kaltes oder kombiniertes Warm- und Kaltwasser, einschließlich Systeme nach EN 806;
—   geschlossene Heizungsanlagen nach EN 12828;
—   Kühlsysteme;
—   Entwässerungssysteme;
—   Brandbekämpfungsanlagen einschließlich Sprinkleranlagen nach EN 12845.
b)   Gasanwendungen:
—   Erdgas- und Flüssiggasanlagen mit einem maximalen Betriebsdruck von weniger als oder gleich 5 bar nach EN 1775;
—   Druckluftsysteme.

Cuivre et alliages de cuivre - Raccords - Partie 4 : Raccords filetés

Le présent document spécifie les caractéristiques de produit, les méthodes d'évaluation, les critères de
conformité des résultats d'essai et un système de désignation pour les raccords filetés. Ces extrémités
filetées existent avec des éléments d'étanchéité métalliques et non métalliques pour l'assemblage avec
des tubes, des tuyaux, des raccords ou des vannes, les extrémités filetées ont une gamme de dimensions
comprise entre 3,175 mm (1/8”) et 101,6 mm (4”). Les raccords filetés sont conçus pour une durée de
vie en service supérieure à 50 ans.
Les raccords sont utilisés jusqu'aux températures de service et aux pressions maximales de service
correspondantes indiquées à l'Annexe A.
Le présent document s'applique aux raccords en alliage de cuivre. Une liste non exhaustive de ces alliages
de cuivre figure dans la CEN/TS 13388.
Les raccords filetés peuvent également comporter des raccordements par brides conformément à
l’EN 1092-3.
Les raccords filetés peuvent également avoir une surface plaquée ou un autre revêtement de surface
décoratif.
Les raccords peuvent être fabriqués par usinage, formage des métaux, moulage ou mécanosoudage.
Les produits couverts par le présent document sont destinés à être utilisés dans :
a) les applications liquides :
- les systèmes d'eau chaude, d'eau froide ou d'eau chaude et d'eau froide combinées, y compris les
systèmes conformes à l’EN 806 ;
- les systèmes de chauffage fermés conformes à l'EN 12828 ;
- les systèmes de refroidissement ;
- les systèmes de purge ;
- les systèmes de protection contre l'incendie, y compris les systèmes d'extinction de type
sprinkleur conformes à l’EN 12845.
b) les applications pour le gaz :
- les systèmes fonctionnant au gaz naturel et des systèmes fonctionnant au gaz de pétrole liquéfiés
avec une pression maximale de service inférieure ou égale à 5 bar, conformément à l'EN 1775 ;
- les systèmes d’air comprimé.

Baker in bakrove zlitine - Fitingi - 4. del: Fitingi z navojem

General Information

Status
Published
Publication Date
25-May-2021
Withdrawal Date
29-Nov-2021
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
26-May-2021
Due Date
27-Nov-2020
Completion Date
26-May-2021

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SLOVENSKI STANDARD
SIST EN 1254-4:2021
01-julij-2021
Nadomešča:
SIST EN 1254-4:2000
SIST EN 1254-4:2000/AC:2002
Baker in bakrove zlitine - Fitingi - 4. del: Fitingi z navojem
Copper and copper alloys - Plumbing fittings - Part 4: Threaded fittings
Kupfer und Kupferlegierungen - Fittings - Teil 4: Gewindefittings
Cuivre et alliages de cuivre - Raccords - Partie 4 : Raccords filetés
Ta slovenski standard je istoveten z: EN 1254-4:2021
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.150.30 Bakreni izdelki Copper products
SIST EN 1254-4:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 1254-4:2021

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SIST EN 1254-4:2021


EN 1254-4
EUROPEAN STANDARD

NORME EUROPÉENNE

May 2021
EUROPÄISCHE NORM
ICS 23.040.40 Supersedes EN 1254-4:1998
English Version

Copper and copper alloys - Plumbing fittings - Part 4:
Threaded fittings
Cuivre et alliages de cuivre - Raccords - Partie 4 : Kupfer und Kupferlegierungen - Fittings - Teil 4:
Raccords filetés Gewindefittings
This European Standard was approved by CEN on 23 November 2020.

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, Turkey 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1254-4:2021 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
SIST EN 1254-4:2021
EN 1254-4:2021 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Product characteristics . 6
4.1 Internal pressure . 6
4.2 Tightness . 6
4.3 Resistance to high temperature (for heating networks) . 6
4.4 Release of dangerous substances . 7
4.5 Durability . 7
4.6 Wall thickness at threaded portions of fittings . 7
4.7 Dimensions of tail pipe ends for swivel fittings . 7
4.8 Dimensions of gas union connectors . 8
4.9 Threaded end dimensions . 8
4.10 Other adapter ends (not defined in EN 1254-20:2021) . 8
4.11 Bore dimensions . 8
4.12 Alignment of the fitting ends . 8
4.13 Shapes for tightening systems . 8
4.14 Surface condition . 8
4.15 Plated or coated surfaces . 8
5 Testing, assessment and sampling methods . 9
5.1 General . 9
5.2 Internal pressure . 9
5.3 Tightness: Integrity of fabricated fitting bodies or having an 'as cast' microstructure . 9
5.4 Durability . 9
5.5 Wall thickness at threaded portions of adaptor fittings . 10
5.6 Dimensions of tail pipe ends for swivel fittings . 10
5.7 Dimensions of gas union connectors . 10
5.8 Threaded end dimensions . 10
5.9 Bore dimensions . 10
5.10 Alignment of the fitting ends . 11
6 Evaluation of conformity . 11
6.1 General . 11
6.2 Type testing . 11
6.3 Factory production control (FPC) . 13
7 Designation. 15
8 Marking, labelling and packaging . 15
8.1 General . 15
8.2 Dezincification resistant copper zinc alloys . 15
Annex A (normative) Maximum operating temperatures and maximum operating
pressures . 16
Bibliography . 18


2

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SIST EN 1254-4:2021
EN 1254-4:2021 (E)
European foreword
This document (EN 1254-4:2021) has been prepared by Technical Committee CEN/TC 133 “Copper and
copper alloys”, the secretariat of which is held by DIN.
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 2021, and conflicting national standards
shall be withdrawn at the latest by November 2021.
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 1254-4:1998.
The main changes to EN 1254-4:1998 are:
— focus on threaded fittings instead of threaded ends;
— separation of test methods and the geometrical description of the standardized threads into part
20.
This part of the standard (EN 1254-4) should be read in conjunction with EN 1254-20:2021.
EN 1254 comprises the following parts under the general title “Copper and copper alloys — Plumbing
fittings”:
— Part 1: Capillary fittings for soldering or brazing to copper tubes
— Part 2: Compression fittings for use with copper tubes
— Part 3: Compression fittings for use with plastics and multilayer pipes
— Part 4: Threaded fittings
— Part 5: Capillary fittings with short ends for brazing to copper tubes
— Part 6: Push-fit fittings for use with metallic tubes, plastics and multilayer pipes
— Part 7: Press and for use with metallic tubes
— Part 8: Press and for use with plastics and multilayer pipes
— Part 20: Definitions, thread dimensions, test methods, reference data and supporting information
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, Turkey and the
United Kingdom.
3

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SIST EN 1254-4:2021
EN 1254-4:2021 (E)
Introduction
Products complying with this document may be used for several fluids including the transport of water
intended for human consumption if they comply with the relevant national, regional or local regulatory
provisions applicable in the place of use.
4

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SIST EN 1254-4:2021
EN 1254-4:2021 (E)
1 Scope
This document specifies product characteristics, assessment methods, compliance criteria of the test
results and a designation system for threaded fittings. These threaded ends exist with metallic and with
non-metallic sealing elements for the purposes of joining with tubes, pipes, fittings or valves, the
threaded ends have a size range from 3,175 mm (1/8”) to 101,6 mm (4”). The threaded fittings are
designed for a service lifetime up to fifty years.
The fittings are used up to the operating temperatures and corresponding maximum operating
pressures as indicated in Annex A.
This document applies to copper alloy fittings. A non-exhaustive list of these copper alloys is given in
CEN/TS 13388.
Threaded fittings may also have flanged end connections according to EN 1092-3.
Threaded fittings may also have a plated or other decorative surface coating.
Fittings can be produced by machining, metal forming, casting, or fabrication.
Products covered by this document are intended to be used in:
a) liquid applications:
— hot, cold or combined hot and cold water, includingsystems according to EN 806;
— closed heating systems according to EN 12828;
— cooling systems;
— drainage systems;
— fire protection systems including sprinkler systems according to EN 12845.
b) gas applications:
— natural gas and liquefied petroleum gas systems with a maximum operating pressure less than
or equal to 5 bar according to EN 1775;
— compressed air systems.
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 681-1:1996, Elastomeric seals — Materials requirements for pipe joint seals used in water and
drainage applications - Part 1: Vulcanized rubber
EN 1254-20:2021, Copper and copper alloys — Plumbing fittings — Part 20: Definitions, thread
dimensions, test methods, reference data and supporting information
EN 10226-3, Pipes threads where pressure tight joint are made on the threads — Part 3: Verification by
means of limit gauges
5

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SIST EN 1254-4:2021
EN 1254-4:2021 (E)
EN 12502-2, Protection of metallic materials against corrosion — Guidance on the assessment of
corrosion likelihood in water distribution and storage systems — Part 2: Influencing factors for copper
and copper alloys
EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1)
EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1)
ISO 7-2, Pipe threads where pressure-tight joints are made on the threads — Part 2: Verification by means
of limit gauges
ISO 228-2, Pipe threads where pressure-tight joints are not made on the threads — Part 2: Verification by
means of limit gauges
ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed
by acceptance quality limit (AQL) for lot-by-lot inspection
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1254-20:2021 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Product characteristics
4.1 Internal pressure
When tested according to the method in 5.2 fittings shall show no signs of leakage or permanent
distortion.
4.2 Tightness
4.2.1 Leak tightness under internal hydrostatic pressure
Fittings assessed as indicated in 4.1 are considered to be leak tight under internal hydrostatic pressure.
4.2.2 Integrity of fabricated fitting bodies or having an 'as cast' microstructure
This requirement only applies to fitting bodies with an 'as cast' microstructure (excluding continuously
cast materials) or fabricated by welding or brazing.
When tested according to the method in 5.3 fitting bodies shall show no visual indication of leakage.
4.3 Resistance to high temperature (for heating networks)
The main aspect for the resistance to high temperature depends on the elastomeric sealing element.
Therefore the elastomer shall have the appropriate characteristics as specified for the specific
applications in EN 681-1. The elastomeric sealing elements shall conform to the requirements of
EN 681-1:1996, Table 3 for continuous hot water supply up to 110 °C except for Isoprene-Isobutylene
Copolymer (IIR) where a volume change in water up to and including 15 % is permitted.
Non-elastomeric sealing elements shall comply with their appropriate standard.
6

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SIST EN 1254-4:2021
EN 1254-4:2021 (E)
4.4 Release of dangerous substances
National regulations on dangerous substances may require verification and declaration on release, and
sometimes content, when construction products covered by this document are placed on those markets.
In the absence of European harmonized test methods, verification and declaration on release/content
should be done taking into account national provisions in the place of use.
NOTE An informative database covering European and national provisions on dangerous substances is
available at the Construction website on EUROPA accessed through: http://ec.europa.eu/growth/tools-
databases/cp-ds.
4.5 Durability
4.5.1 Durability of internal pressure: Resistance to stress corrosion
Fittings manufactured from copper and copper-tin-zinc alloys (CuSnZnPb) shall be considered to be
resistant to stress corrosion according to EN 12502-2 and copper-zinc-silicon alloys containing ≥ 2 % Si
are also considered to be resistant.
Fittings manufactured from CuZn-alloys shall be considered to be resistant to stress corrosion when the
product has a hardness HBW 2,5/62,5 ≤ 110 measured according to EN ISO 6506-1 or a hardness
10
HV ≤ 134 measured according to EN ISO 6507-1.
5
Fittings manufactured from copper alloys with a zinc content of 10 % or greater not mentioned above
shall be tested and assessed according to 5.4.1, and shall show no evidence of cracking.
4.5.2 Durability of tightness: Resistance to dezincification
This requirement only applies where a fitting is declared to be resistant to dezincification.
The resistance to dezincification of alloy fittings can be obtained by the correct material selection and
processing of that material.
Alloys containing 15 % or less zinc provide a good resistance to dezincification and don't need to be
tested.
Representative material samples, prior to machining, shall be tested. When tested according to 5.4.2.
the mean and maximum depth of dezincification in any direction shall be expressed in µm and shall
meet the acceptance criteria listed below for resistance to dezincification:
— for grade A: maximum 200 µm;
— for grade B: mean not to exceed 200 µm and maximum not to exceed 400 µm.
If any of the test pieces do not meet the criteria for the chosen grade, a second lot of test samples from
the same batch shall be selected and the test repeated. If any of the second lot of test pieces fails, then
the batch represented shall be deemed not to conform to the requirements of this document.
4.6 Wall thickness at threaded portions of fittings
This requirement only applies to fittings with an interface thread.
When assessed according to the method specified in 5.5 the minimum wall thickness at the interface
thread shall be as expressed in EN 1254-20:2021, 4.1 for the relevant diameters.
4.7 Dimensions of tail pipe ends for swivel fittings
This requirement only applies to tail pipe ends for swivel fittings.
When assessed according to the method specified in 5.6 the dimensions shall be as expressed in
EN 1254-20:2021, 4.2 for the thread size.
7

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SIST EN 1254-4:2021
EN 1254-4:2021 (E)
4.8 Dimensions of gas union connectors
This requirement only applies to fittings with gas union connectors.
When assessed according to the method specified in 5.7 the dimensions shall be as expressed in
EN 1254-20:2021, 4.3 for corresponding nominal size.
4.9 Threaded end dimens
...

SLOVENSKI STANDARD
oSIST prEN 1254-4:2019
01-september-2019
Baker in bakrove zlitine - Fitingi - 4. del: Fitingi z navojem
Copper and copper alloys - Plumbing fittings - Part 4: Threaded fittings
Kupfer und Kupferlegierungen - Fittings - Teil 4: Gewindeenden
Cuivre et alliages de cuivre - Raccords - Partie 4 : Raccords filetés
Ta slovenski standard je istoveten z: prEN 1254-4
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.150.30 Bakreni izdelki Copper products
oSIST prEN 1254-4:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 1254-4:2019

---------------------- Page: 2 ----------------------
oSIST prEN 1254-4:2019


DRAFT
EUROPEAN STANDARD
prEN 1254-4
NORME EUROPÉENNE

EUROPÄISCHE NORM

June 2019
ICS 23.040.40 Will supersede EN 1254-4:1998
English Version

Copper and copper alloys - Plumbing fittings - Part 4:
Threaded fittings
Cuivre et alliages de cuivre - Raccords - Partie 4 : Kupfer und Kupferlegierungen - Fittings - Teil 4:
Raccords filetés Gewindeenden
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 133.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, North
Macedonia, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1254-4:2019 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
oSIST prEN 1254-4:2019
prEN 1254-4:2019 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Product characteristics . 7
4.1 Internal pressure . 7
4.2 Tightness . 7
4.2.1 Leak tightness under internal hydrostatic pressure . 7
4.2.2 Integrity of fabricated fitting bodies or having an 'as cast' microstructure . 8
4.3 Resistance to high temperature (for heating networks) . 8
4.4 Release of dangerous substances . 8
4.5 Durability . 8
4.5.1 Durability of internal pressure . 8
4.5.2 Durability of tightness . 8
4.6 Wall thickness at threaded portions of fittings . 9
4.7 Dimensions of tail pipe ends for swivel fittings . 9
4.8 Dimensions of gas union connectors . 9
4.9 Threaded end dimensions . 9
4.10 Other adapter ends (not defined in prEN 1254-20:2019) . 9
4.11 Bore dimensions . 9
4.12 Alignment of the fitting ends . 11
4.13 Shapes for tightening systems . 11
4.14 Surface condition . 11
4.15 Plated or coated surfaces . 11
5 Testing, assessment and sampling methods . 11
5.1 General . 11
5.1.1 Preparation of fittings for testing. 11
5.1.2 Test temperature . 11
5.2 Internal pressure . 11
5.3 Tightness . 12
5.3.1 Integrity of fabricated fitting bodies or having an 'as cast' microstructure . 12
5.4 Durability . 12
5.4.1 Durability of internal pressure . 12
5.4.2 Durability of tightness . 12
5.5 Wall thickness at threaded portions of adaptor fittings . 12
5.5.1 Type testing . 12
5.5.2 FPC testing . 12
5.6 Dimensions of tail pipe ends for swivel fittings . 13
5.7 Dimensions of gas union connectors . 13
5.7.1 Type testing . 13
5.7.2 FPC testing . 13
5.8 Threaded end dimensions . 13
5.9 Bore dimensions . 13
5.10 Alignment of the fitting ends . 13
2

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oSIST prEN 1254-4:2019
prEN 1254-4:2019 (E)
6 Assessment and verification of constancy of performance - AVCP . 13
6.1 General . 13
6.2 Type testing . 14
6.2.1 General . 14
6.2.2 Test samples, testing and compliance criteria . 14
6.2.3 Test reports . 16
6.3 Factory production control (FPC) . 16
6.3.1 General . 16
6.3.2 Requirements . 16
6.3.3 Product specific requirements . 19
6.3.4 Procedure for modifications . 19
6.3.5 One-off products, pre-production products (e.g. prototypes) and products produced
in very low quantity . 20
7 Classification and designation . 20
8 Marking, labelling and packaging . 21
8.1 General . 21
8.2 Dezincification resistant copper zinc alloys . 21
Annex A (normative) Maximum operating temperatures and maximum operating pressures . 22
Bibliography . 24

3

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oSIST prEN 1254-4:2019
prEN 1254-4:2019 (E)
European foreword
This document (prEN 1254-4:2019) has been prepared by Technical Committee CEN/TC 133 “Copper
and copper alloys”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1254-4:1998, EN 1254-4:1998/AC:1999.
This part of the standard (EN 1254-4) should be read in conjunction with prEN 1254-20:2019.
EN 1254 comprises the following parts under the general title “Copper and copper alloys — Plumbing
fittings”:
— Part 1: Capillary fittings for soldering or brazing to copper tubes
— Part 2: Compression fittings for use with copper tubes
— Part 3: Compression fittings for use with plastics and multilayer pipes
— Part 4: Threaded fittings
— Part 5: Capillary fittings with short ends for brazing to copper tubes
— Part 6: Push-fit fittings for use with metallic tubes, plastics and multilayer pipes
— Part 7: Press and for use with metallic tubes
— Part 8: Press and for use with plastics and multilayer pipes
— Part 20: Definitions, thread dimensions, test methods, reference data and supporting information
The main changes to EN1254-4:1998 are:
— focus on threaded fittings instead of threaded ends;
— separation of test methods and the geometrical description of the standardized threads into part
20.

4

---------------------- Page: 6 ----------------------
oSIST prEN 1254-4:2019
prEN 1254-4:2019 (E)
Introduction
Products complying with this European standard may be used for the transport of water intended for
human consumption if they comply with the relevant national, regional or local regulatory provisions
applicable in place of use.

5

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oSIST prEN 1254-4:2019
prEN 1254-4:2019 (E)
1 Scope
This document specifies product characteristics, assessment methods, compliance criteria and a
designation system for threaded fittings. These threaded ends exist with metallic and with non-metallic
sealing elements for the purposes of joining with tubes, pipes, fittings or valves, the threaded ends have
a size range from 3,175 mm (1/8”) to 101,6 mm (4”). The threaded fittings are designed for a service
lifetime up to fifty years.
The fittings are used up to the operating temperatures and maximum operating pressures as indicated
in Annex A.
This document applies to copper alloy fittings. A non-exhaustive list of these copper alloys is given in
CEN/TS 13388.
Threaded fittings may also have flanged end connections according to EN 1092-3.
Threaded fittings may also have a plated or other decorative surface coating.
Fittings can be produced by machining, metal forming, casting, or fabrication.
Products covered by this document are intended to be used in:
a) liquid applications:
— hot, cold or combined hot and cold water systems according to EN 806;
— closed heating systems according to EN 12828 and cooling systems;
— drainage systems;
— sprinkler systems according to EN 12845.
b) gas applications:
— natural gas and liquefied petroleum gas systems with a maximum operating pressure less than
or equal to 5 bar according to EN 1775;
— compressed air systems.
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 681-1:1996, Elastomeric seals — Materials requirements for pipe joint seals used in water and
drainage applications - Part 1: Vulcanized rubber
EN 806 (series), Specifications for installations inside buildings conveying water for human consumption
EN 1092-3, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 3: Copper alloy flanges
prEN 1254-20:2019, Copper and copper alloys — Plumbing fittings — Part 20: Definitions, thread
dimensions, test methods, reference data and supporting information
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oSIST prEN 1254-4:2019
prEN 1254-4:2019 (E)
EN 1775, Gas supply — Gas pipework for buildings — Maximum operating pressure less than or equal to 5
bar - Functional recommendations
EN 10226-3, Pipes threads where pressure tight joint are made on the threads — Part 3: Verification by
means of limit gauges
EN 12502-2, Protection of metallic materials against corrosion — Guidance on the assessment of
corrosion likelihood in water distribution and storage systems — Part 2: Influencing factors for copper
and copper alloys
EN 12828, Heating systems in buildings — Design for water-based heating systems
EN 12845, Fixed firefighting systems — Automatic sprinkler systems — Design, installation and
maintenance
EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1)
EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1)
ISO 7-2, Pipe threads where pressure-tight joints are made on the threads — Part 2: Verification by means
of limit gauges
ISO 228-2, Pipe threads where pressure-tight joints are not made on the threads — Part 2: Verification by
means of limit gauges
ISO 2859-1:1999, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed
by acceptance quality limit (AQL) for lot-by-lot inspection
ISO 6957:1988, Copper alloys — Ammonia test for stress corrosion resistance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in prEN 1254-20:2019 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Product characteristics
4.1 Internal pressure
When tested according to the method in 5.2 fittings shall show no signs of leakage or permanent
distortion.
4.2 Tightness
4.2.1 Leak tightness under internal hydrostatic pressure
Fittings assessed as indicated in 4.1 are considered to be leak tight under internal hydrostatic pressure.
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4.2.2 Integrity of fabricated fitting bodies or having an 'as cast' microstructure
This requirement only applies to fitting bodies with an 'as cast' microstructure (excluding continuously
cast materials) or fabricated by welding or brazing.
When tested according to the method in 5.3.1 fitting bodies show no visual indication of leakage.
4.3 Resistance to high temperature (for heating networks)
The main aspect for the resistance to high temperature depends on the elastomeric sealing element.
Therefore the elastomer shall have the appropriate characteristics as specified in EN 681-1. The
elastomeric sealing elements shall conform to the requirements of EN 681-1:1996, Table 3 for
continuous hot water supply up to 110 °C except for Isoprene-Isobutylene Copolymer (IIR) where a
volume change in water up to and including 15 % is permitted.
Non-elastomeric sealing elements shall comply with their appropriate standard.
4.4 Release of dangerous substances
National regulations on dangerous substances may require verification and declaration on release, and
sometimes content, when construction products covered by this standard are placed on those markets.
In the absence of European harmonized test methods, verification and declaration on release/content
should be done taking into account national provisions in the place of use.
4.5 Durability
4.5.1 Durability of internal pressure
4.5.1.1 Resistance to stress corrosion
Fittings manufactured from copper and copper-tin-zinc alloys (CuSnZnPb) shall be considered to be
resistant to stress corrosion according to EN 12502-2 and copper-zinc-silicon alloys containing ≥ 2 % Si
are also considered to be resistant.
Fittings manufactured from CuZn-alloys shall be considered to be resistant to stress corrosion when the
product has a hardness HBW 2,5/62,5 ≤ 110 measured according to EN ISO 6506-1 or a hardness
10
HV ≤ 134 measured according to EN ISO 6507-1.
5
Fittings manufactured from copper alloys with a zinc content of 10 % or greater not mentioned above
shall be tested and assessed according to 5.4.1.1, and shall show no evidence of cracking.
4.5.2 Durability of tightness
4.5.2.1 Resistance to dezincification
Does not apply to fittings for gas applications.
The resistance to dezincification of alloy fittings can be obtained by the correct material selection and
processing of that material.
Alloys containing 10 % or less zinc provide a good resistance to dezincification and don't need to be
tested.
Representative material samples, prior to machining, shall be tested. When tested according to 5.4.2.1,
the mean and maximum depth of dezincification in any direction shall be expressed in µm and shall
meet the acceptance criteria listed below for resistance to dezincification:
— for grade A: maximum 200 µm;
— for grade B: mean not to exceed 200 µm and maximum 400 µm.
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If any of the test pieces do not meet the criteria for the chosen grade, a second lot of test samples from
the same batch shall be selected and the test repeated. If any of the second lot of test pieces fails, then
the batch represented shall be deemed not to conform to the requirements of this standard.
4.6 Wall thickness at threaded portions of fittings
This requirement only applies to fittings with an interface thread.
When assessed according to the method specified in 5.5 the minimum wall thickness at the interface
thread shall be as expressed in prEN 1254-20:2019, 4.1 for the relevant diameters.
4.7 Dimensions of tail pipe ends for swivel fittings
This requirement only applies to tail pipe ends for swivel fittings.
When assessed according to the method specified in 5.6 the dimensions shall be as expressed in
prEN 1254-20:2019, 4.2 for the thread size.
4.8 Dimensions of gas union connectors
This requirement only applies to fittings with gas union connectors.
When assessed according to the method specified in 5.7 the dimensions shall be as expressed in
prEN 1254-20:2019, 4.3 for corresponding nominal size.
4.9 Threaded end dimensions
This requirement only applies to fitting bodies with threaded ends.
When assessed according to the method specified in 5.8 the thread shall be in accordance with
prEN 1254-20:2019, 4.4.
4.10 Other adapter ends (not defined in prEN 1254-20:2019)
Other adapter ends, when assembled in accordance with the manufacturer's instructions and pressure
tested according to the method in 5.2 shall show no signs of leakage or permanent distortion. When re-
tested in accordance with the test method in 5.2 after disconnection and reconnection, it shall again
show no signs of leakage or permanent distortion. If after disconnection the sealing element shows
signs of damage, it shall be replaced before the second test.
4.11 Bore dimensions
To minimize flow resistance, minimum bore dimensions are required.
When assessed according to the test method in 5.9, the minimum bore shall be greater or equal to the
values expressed in Table 1 for the relevant nominal diameter.
For unequal-ended or adaptor fittings, the smallest diameter shall apply provided that this diameter
does not restrict other outlets.
Bores at threaded portions of fittings shall not restrict other outlets.
Table 1 — Minimum bore
Dimensions in millimetres
Nominal diameter Minimum bore diameter Minimum cross-sectional area
D
2
mm mm mm
6 4,0 12,6
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oSIST prEN 1254-4:2019
prEN 1254-4:2019 (E)
Nominal diameter Minimum bore diameter Minimum cross-sectional area
D
2
mm mm mm
8 6,0 28,3
10 7,0 38,5
12 9,0 63,6
14 10,0 78,5
14,7 11,0 95,0
15 11,0 95,0
16 12,0 113,1
18 14,0 153,9
21 18,0 254,5
22 18,0 254,5
25 21,0 346,4
27,4 23,0 415,5
28 23,0 415,5
34 29,0 660,5
35 29,0 660,5
40 35,0 962,1
40,5 36,0 1 017,9
42 36,0 1 017,9
53,6 47,0 1 734,9
54 47,0 1 734,9
64 55,0 2 375,8
66,7 57,0 2 551,8
70 60,0 2 827,4
76,1 65,0 3 318,3
80 68,0 3 631,7
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oSIST prEN 1254-4:2019
prEN 1254-4:2019 (E)
Nominal diameter Minimum bore diameter Minimum cross-sectional area
D
2
mm mm mm
88,9 76,0 4 536,5
106 92,0 6 647,6
108 92,0 6 647,6
133 113,0 10 028,7
159 135,0 14 313,9

4.12 Alignment of the fitting ends
When tested according to the method in 5.10, the alignment of the fitting ends with reference to the
specified axis should be within ± 2°.
4.13 Shapes for tightening systems
When visually inspected, fittings with threads shall have a shape or suitable features for the
transmission of tightening torques.
4.14 Surface condition
When visually inspected, fittings shall be free from sharp edges or burrs.
4.15 Plated or coated surfaces
Requirements for plated or coated surfaces shall be the subject of agreement between the purchaser
and the manufacturer and shall not impair the performance of the joint.
5 Testing, assessment and sampling methods
5.1 General
5.1.1 Preparation of fittings for testing
Combinations of fitting size within a test rig are possible. The minimum distance between the fitting
under test and each end of the assembly shall be 100 mm. Adaptor fittings used to connect the test
pipework to a pump for example, may also be considered as a test fitting.
New fittings are required for each test.
NOTE See also prEN 1254-20:2019, Annex A.
5.1.2 Test temperature
Tests shall be conducted at a temperature of (23 ± 5) °C unless otherwise stated.
5.2 Internal pressure
Test in accordance with the method described in prEN 1254-20:2019, Clause 5 using the parameters
shown in Table 2.
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Table 2 — Hydrostatic pressure test parameters
Free length of the tube a in Test pressure Test duration
the test assembly
mm bar min
100 1,5 × operating pressure 15
NOTE The operating pressure could be inspired on the maximum pressure specified in Annex A.

5.3 Tightness
5.3.1 Integrity of fabricated fitting bodies or having an 'as cast' microstructure
Test, after the final machining operation, in accordance with the method described in
prEN 1254-20:2019, Clause 7 using the parameters shown in Table 3.
Table 3 — Pneumatic pressure test parameters
Test pressure
Fitting type
bar
Cast or fabricated bodies 5 ± 0,5

5.4 Durability
5.4.1 Durability of internal pressure
5.4.1.1 Resistance test to stress corrosion
Test in accordance with the method described in prEN 1254-20:2019, Clause 15 / ISO 6957:1988.
5.4.2 Durability of tightness
5.4.2.1 Resistance to dezincification
The test method is described in prEN 1254-20:2019, Clause 17.
5.5 Wall thickness at threaded portions of adaptor fittings
5.5.1 Type testing
The wall thickness shall be measured with a special micrometer or the fitting shall be sectioned and the
wall thickness assessed with a calliper or equivalent instrument. The accuracy of the measuring
instrument shall be at least one decimal greater than the value specified in prEN 1254-20:2019, 4.1 for
that diameter. The wall thickness shall be measured at three or more discrete places and efforts shall be
made to find the minimum.
5.5.2 FPC testing
The wall thickness shall be measured as per 5.5.1 or with a special purpose gauge. The accuracy of the
measuring instrument shall be at least one decimal greater than the value specified in
prEN 1254-20:2019, 4.1 for that diameter.
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5.6 Dimensions of tail pipe ends for swivel fittings
The dimensions of tail pipe ends for swivel fittings shall be assessed with a gauge, a calliper, a
micrometer or equivalent instrument. The accuracy of the measuring instrument shall be at least one
decimal greater than the value specified in prEN 1254-20:2019, 4.2 for that diameter.
5.7 Dimensions of gas union connectors
5.7.1 Type testing
The dimensions of gas union connectors shall be assessed with a calliper, a micrometer or equivalent
instrument. The accuracy of the measuring instrument shall be at least one decimal greater than the
value specified in prEN 1254-20:2019, 4.3 for that diameter.
5.7.2 FPC testing
The dimensions of gas union connectors shall be assessed with a gauge. The accuracy of the measuring
instrument shall be at leas
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