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

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.

Kupfer und Kupferlegierungen - Fittings - Teil 4: Gewindefittings

Dieses Dokument legt Produkteigenschaften, Bewertungsmethoden, Konformitätskriterien 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 maximalen Betriebsdrücken eingesetzt.
Dieses Dokument gilt 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 Bearbeiten, Metallumformen, Gießen oder Fertigen hergestellt werden.
Die unter dieses Dokument fallenden Produkte sind für den Einsatz bestimmt in:
a)   Flüssigkeitsanwendungen:
-   Warm-, Kalt- oder kombinierte Warm-/Kaltwassersysteme nach EN 806;
-   geschlossene Heizsysteme nach EN 12828 und Kühlsysteme;
-   Entwässerungssysteme;
-   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 et un système de désignation pour les raccords à vis. 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 à vis 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 de service maximales 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 à vis peuvent également comporter des raccordements à brides conformément à l’EN 1092-3.
Les raccords à vis 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 conformes à l’EN 806 ;
-   les systèmes de chauffage fermés conformes à l'EN 12828 et les systèmes de refroidissement ;
-   les systèmes de purge ;
-   les systèmes d'extinction de type sprinkleur conformes à l’EN 12845.
b)   les applications de 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
Public Enquiry End Date
04-Sep-2019
Publication Date
03-Jun-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
03-Jun-2021
Due Date
08-Aug-2021
Completion Date
04-Jun-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.

---------------------- Page: 1 ----------------------
SIST EN 1254-4:2021
---------------------- Page: 2 ----------------------
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

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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.
---------------------- Page: 5 ----------------------
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.
---------------------- Page: 6 ----------------------
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
---------------------- Page: 7 ----------------------
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.
---------------------- Page: 8 ----------------------
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

HV ≤ 134 measured according to EN ISO 6507-1.

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.
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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

---------------------- Page: 4 ----------------------
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

---------------------- Page: 5 ----------------------
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.
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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.
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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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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

HV ≤ 134 measured according to EN ISO 6507-1.

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
mm mm mm
6 4,0 12,6
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Nominal diameter Minimum bore diameter Minimum cross-sectional area
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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Nominal diameter Minimum bore diameter Minimum cross-sectional area
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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