Copper and copper alloys - Plumbing fittings - Part 7: Press fittings for use with metallic tubes

This document specifies product characteristics, assessment methods, compliance criteria and a designation system for press fittings including their elastomeric seals, for connecting with metallic tubes. The fitting ends have a size range from 6 mm to 108 mm. The press fittings are designed for a service lifetime up to fifty years.
This document is applicable to press fittings for joining one or more of the following tubes:
-   copper tubes to EN 1057 and
-   stainless steel tubes to EN 10312
with wall thicknesses and tempers as specified by the manufacturer.
The fittings are used up to the operating temperatures and maximum operating pressures as indicated in Annex A.
Press fittings are used with tubes with wall thicknesses greater than or equal to the wall thickness given in Annex B, to ensure that tubes can withstand the radial pressing forces involved.
This document applies to copper alloy fittings. A non-exhaustive list of these copper alloys is given in CEN/TS 13388.
Adaptor fittings for use with copper tubes may combine press ends with fitting ends defined in the other parts of EN 1254.
Press fittings for use with metallic tubes may also have flanged end connections according to EN 1092-3.
Press fittings for use with metallic tubes 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 standard are intended to be used in:
a)   liquid applications:
-   hot or 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 7: Pressfittings für den Einsatz mit metallischen Rohren

Dieses Dokument legt Produkteigenschaften, Bewertungsverfahren, Konformitätskriterien und ein Bezeichnungssystem für Pressfittings, einschließlich ihrer elastomeren Dichtungen, für die Verbindung von Metallrohren fest. Die Fittingenden haben einen Größenbereich von 6 mm bis 108 mm. Die Pressfittings sind für eine Lebensdauer von bis zu fünfzig Jahren ausgelegt.
Dieses Dokument gilt für Pressfittings zum Verbinden eines oder mehrerer der folgenden Rohre:
-   Kupferrohre nach EN 1057 und
-   Rohre aus nichtrostendem Stahl nach EN 10312
mit den vom Hersteller festgelegten Wanddicken und Härtegraden.
Die Fittings werden bis zu den in Anhang A angegebenen Betriebstemperaturen und maximalen Betriebsdrücken eingesetzt.
Pressfittings werden mit Rohren mit Wanddicken größer als oder gleich der in Anhang B angegebenen Wanddicke verwendet, um sicherzustellen, dass die Rohre den auftretenden radialen Presskräften standhalten können.
Dieses Dokument gilt für Fittings aus Kupferlegierungen. Eine nicht vollständige Liste dieser Kupferlegierungen ist in CEN/TS 13388 enthalten.
Übergangsfittings für Kupferrohre dürfen Pressenden mit in den anderen Teilen der EN 1254 definierten Fittingenden kombinieren.
Pressfittings für Metallrohre dürfen auch Flanschendanschlüsse nach EN 1092-3 aufweisen.
Pressfittings für Metallrohre dürfen auch einen galvanischen oder anderen dekorativen Oberflächenüberzug aufweisen.
Fittings können durch Bearbeiten, Metallumformen, Gießen oder Fertigen hergestellt werden.
Die unter diese Norm 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 7 : Raccords à sertir pour tubes métalliques

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 sertir, y compris leurs éléments d'étanchéité en élastomères, pour le raccordement de tubes métalliques. Les extrémités de raccords ont une gamme de dimensions comprise entre 6 mm et 108 mm. Les raccords à sertir sont conçus pour une durée de vie en service supérieure à 50 ans.
Le présent document est applicable aux raccords à sertir permettant de raccorder un ou plusieurs tubes des types suivants :
-   tubes en cuivre selon l'EN 1057 et
-   tubes en acier inoxydable selon l’EN 10312
avec des épaisseurs et duretés spécifiées par le fabricant.
Les raccords sont utilisés jusqu'aux températures de service et aux pressions de service maximales indiquées à l'Annexe A.
Les raccords à sertir sont utilisés avec des tubes dont l'épaisseur de paroi est supérieure ou égale à l'épaisseur de paroi indiquée à l'Annexe B, afin de garantir que les tubes peuvent résister aux forces de sertissage radiales impliquées.
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 adaptateurs utilisés avec des tubes en cuivre peuvent combiner des extrémités à sertir avec des extrémités de raccord définies dans les autres parties de l’EN 1254.
Les raccords à sertir pour tubes métalliques peuvent également comporter des raccordements à brides conformément à l’EN 1092-3.
Les raccords à sertir pour tubes métalliques 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 la présente norme sont destinés à être utilisés dans :
a)   les applications liquides :
-   les systèmes d'eau chaude ou 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 - 7. del: Fitingi s stiskalnimi priključki za spajanje s kovinskimi cevmi

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 1254-7:2021
01-julij-2021

Baker in bakrove zlitine - Fitingi - 7. del: Fitingi s stiskalnimi priključki za spajanje

s kovinskimi cevmi

Copper and copper alloys - Plumbing fittings - Part 7: Press fittings for use with metallic

tubes

Kupfer und Kupferlegierungen - Fittings - Teil 7: Pressfittings für den Einsatz mit

metallischen Rohren

Cuivre et alliages de cuivre - Raccords - Partie 7 : Raccords à sertir pour tubes

métalliques
Ta slovenski standard je istoveten z: EN 1254-7:2021
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.150.30 Bakreni izdelki Copper products
SIST EN 1254-7:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 1254-7:2021
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SIST EN 1254-7:2021
EN 1254-7
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2021
EUROPÄISCHE NORM
ICS 23.040.40
English Version
Copper and copper alloys - Plumbing fittings - Part 7: Press
fittings for use with metallic tubes

Cuivre et alliages de cuivre - Raccords - Partie 7 : Kupfer und Kupferlegierungen - Fittings - Teil 7:

Raccords à sertir pour tubes métalliques Pressfittings für den Einsatz mit metallischen Rohren

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 1254-7:2021 E

worldwide for CEN national Members.
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 8

4 Product characteristics ................................................................................................................................. 8

4.1 Internal pressure ............................................................................................................................................ 8

4.2 Tightness ............................................................................................................................................................ 8

4.3 Resistance to high temperature (for heating networks) ............................................................... 10

4.4 Release of dangerous substances ........................................................................................................... 10

4.5 Durability ........................................................................................................................................................ 10

4.6 Wall thickness at threaded portions of adaptor fittings ................................................................ 11

4.7 Dimensions of tail pipe ends for swivel fittings ................................................................................ 11

4.8 Dimensions of gas union connectors .................................................................................................... 11

4.9 Threaded end dimensions ........................................................................................................................ 11

4.10 Other adapter ends (not defined in EN 1254-20:2021) ................................................................. 11

4.11 Bore dimensions ........................................................................................................................................... 12

4.12 Identity of elastomeric sealing material for liquid applications ................................................ 12

4.13 Identity of elastomeric sealing material for gas applications ...................................................... 12

4.14 Tube abutment .............................................................................................................................................. 12

4.15 Alignment of the fitting ends .................................................................................................................... 12

4.16 Shapes for tightening systems ................................................................................................................. 12

4.17 Surface condition ......................................................................................................................................... 12

4.18 Plated or coated surfaces .......................................................................................................................... 13

5 Testing, assessment and sampling methods ...................................................................................... 13

5.1 General ............................................................................................................................................................. 13

5.2 Internal pressure ......................................................................................................................................... 13

5.3 Tightness ......................................................................................................................................................... 14

5.4 Durability ........................................................................................................................................................ 16

5.5 Wall thickness at threaded portions of adaptor fittings ................................................................ 17

5.6 Dimensions of tail pipe ends for swivel fittings ................................................................................ 17

5.7 Dimensions of gas union connectors .................................................................................................... 17

5.8 Threaded end dimensions ........................................................................................................................ 18

5.9 Bore dimensions ........................................................................................................................................... 18

5.10 Identity of elastomeric sealing material for liquid applications ................................................ 18

5.11 Identity of elastomeric sealing material for gas applications ...................................................... 18

5.12 Alignment of the fitting ends .................................................................................................................... 18

6 Evaluation of conformity ........................................................................................................................... 18

6.1 General ............................................................................................................................................................. 18

6.2 Type testing .................................................................................................................................................... 19

6.3 Factory production control (FPC) .......................................................................................................... 25

7 Designation..................................................................................................................................................... 29

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SIST EN 1254-7:2021
EN 1254-7:2021 (E)

8 Marking, labelling and packaging ........................................................................................................... 29

8.1 General ............................................................................................................................................................. 29

8.2 Additional marking ...................................................................................................................................... 29

8.3 Dezincification resistant copper zinc alloys ....................................................................................... 30

Annex A (normative) Maximum operating temperatures and corresponding maximum

operating pressures ..................................................................................................................................... 31

Annex B (normative) Minimum nominal wall thicknesses of copper tube with R220, R250

and R290 temper conforming to EN 1057 suitable for jointing by press fittings .................. 32

Bibliography ................................................................................................................................................................. 34

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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
European foreword

This document (EN 1254-7:2021) 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 part of the standard (EN 1254-7) 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 fittings for use with metallic tubes
— Part 8: Press fittings 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.
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
Introduction

Products complying with this document may be used several fluids including for 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.
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
1 Scope

This document specifies product characteristics, assessment methods, compliance criteria of test results

and a designation system for press fittings including their elastomeric seals, for connecting with

metallic tubes. The fitting ends have a nominal diameter from 6 mm to 108 mm. The press fittings are

designed for a service lifetime up to fifty years.

This document is applicable to press fittings for joining one or more of the following tubes:

— copper tubes to EN 1057; and
— stainless steel tubes to EN 10312;
with wall thicknesses and tempers as specified by the manufacturer.

The fittings are used up to the operating temperatures and maximum operating pressures as indicated

in Annex A.

Press fittings are used with tubes with wall thicknesses greater than or equal to the wall thickness given

in Annex B, to ensure that tubes can withstand the radial pressing forces involved.

This document applies to copper alloy fittings. A non-exhaustive list of these copper alloys is given in

CEN/TS 13388.

Adaptor fittings for use with copper tubes may combine press ends with fitting ends defined in the

other parts of EN 1254.

Press fittings for use with metallic tubes may also have flanged end connections according to

EN 1092-3.

Press fittings for use with metallic tubes 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 or cold or combined hot and cold water, including systems 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;

— supply systems for points of consumption with liquid fuels according to EN 12514.

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.
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
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 549:2019, Rubber materials for seals and diaphragms for gas appliances and gas equipment

EN 681-1:1996, Elastomeric seals — Materials requirements for pipe joint seals used in water and

drainage applications — Part 1: Vulcanized rubber

EN 682, Elastomeric Seals — Materials requirements for seals used in pipes and fittings carrying gas and

hydrocarbon fluids

EN 1057, Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and

heating applications

EN 1254-4:2021, Copper and copper alloys — Plumbing fittings — Part 4: Threaded fittings

EN 1254-20:2021, Copper and copper alloys — Plumbing fittings — Part 20: Definitions, thread

dimensions, test methods, reference data and supporting information

EN 1775:2007, 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 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 9924-1, Rubber and rubber products — Determination of the composition of vulcanizates and uncured

compounds by thermogravimetry — Part 1: Butadiene, ethylene-propylene copolymer and terpolymer,

isobutene-isoprene, isoprene and styrene-butadiene rubbers
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
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
4.1.1 For liquid applications

When tested according to the method in 5.2.1 fittings shall show no signs of leakage or permanent

distortion.
4.1.2 For fuel gas applications

When tested according to the method in 5.2.2 fittings shall show no signs of leakage or permanent

distortion.
4.1.3 For compressed air applications

When tested according to the method in 5.2.3 fittings shall show no signs of leakage or permanent

distortion.
4.2 Tightness

4.2.1 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 shall show no visual indication of leakage.

4.2.2 Requirements for liquid applications
4.2.2.1 Leak tightness under internal hydrostatic pressure

Fittings assessed as indicated in 4.1.1 are considered to be leak tight under internal hydrostatic

pressure.
4.2.2.2 Resistance to pull-out

When tested according to the method in 5.3.2.1 the joint assemblies shall withstand the pull-out force

without being separated and shall show no signs of leakage when subjected to the subsequent leak

tightness under internal hydrostatic pressure test as described in 5.2.1.
4.2.2.3 Leak tightness under vibration

When tested according to the method in 5.3.2.2 fittings shall show no signs of leakage.

4.2.2.4 Leak tightness under vacuum

When tested according to the method in 5.3.2.3 the change in pressure shall not be greater than

0,05 bar at the conclusion of the test.
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
4.2.2.5 Leak tightness under temperature cycling

When tested according to the method in 5.3.2.4 fittings shall show no signs of leakage.

4.2.2.6 Leak before press

If the manufacturer claims this feature, then when tested according to the method in 5.3.2.5 fittings

shall leak at least one drop per second when tested with water or at least one bubble per second when

tested pneumatically.
4.2.3 Requirements for gas applications
4.2.3.1 Leak tightness under internal pneumatic pressure

Fittings assessed as indicated in 4.1.2 and 4.1.3 are considered to be leak tight under internal pneumatic

pressure.
4.2.3.2 Resistance to pull-out

When tested according to the method in 5.3.3.1 the joint assemblies shall withstand the pull-out force

without being separated and shall show no signs of leakage when subsequently tested according to the

method in 5.2.2 and/or 5.2.3 according to the application, fittings shall show no signs of leakage or

permanent distortion.
4.2.3.3 Leak tightness under vibration

When tested according to the method in 5.3.3.2 fittings shall show no signs of leakage.

4.2.3.4 Leak tightness under static flexural force
This requirement is not applicable on threaded ends.

When tested according to the method in 5.3.3.3 fittings shall show no signs of leakage or permanent

distortion.
4.2.3.5 Leak tightness under temperature cycling for fuel gas applications

When tested according to the method in 5.3.3.4 fittings shall show no signs of leakage.

4.2.3.6 Leak before press

If the manufacturer claims this feature, then when tested according to the method in 5.3.3.5 fittings

shall leak at least one air bubble per second when tested pneumatically.

4.2.3.7 Press fitting with elastomeric seals for fuel gas application inside buildings

The main aspect for the durability of tightness for fuel gas application inside buildings is the ozone

behaviour of the elastomer. Therefore the elastomer shall be ozone resistant and comply with the

requirements of EN 549 class B2 or higher.

4.2.3.8 Press fitting with elastomeric seals for fuel gas application outside buildings

The main aspect for the durability of tightness for fuel gas application outside buildings depends on the

elastomeric sealing element. Therefore the elastomer shall comply with the requirements of EN 682

types GAL or GBL.
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
4.2.3.9 Leak tightness at high temperature
Only applies for fuel gas applications, to fittings with only press ends.

When tested according to the method in 5.3.3.6, at any point during the test period the nitrogen leakage

rate shall not exceed 150 dm /h per fitting.

Adaptor fittings with press- and threaded ends shall comply with the requirements of EN 1254-4:2021.

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.
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
4.5.2.1 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.
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)

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 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 fail, then the

batch represented shall be deemed not to conform to the requirements of this document.

4.5.2.2 Resistance to pressure cycling for liquid applications

When tested according to the method in 5.4.2.2 fittings shall show no signs of leakage.

4.5.3 Durability of resistance to high temperature (for heating networks)

When tested according to the method in 5.4.3 to one or more of the specified test durations, the

compression set of the sealing material shall be expressed as a percentage.
4.6 Wall thickness at threaded portions of adaptor fittings
This requirement only applies to adaptor 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.
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 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

EN 1254-20:2021, 4.4.
4.10 Other adapter ends (not defined in EN 1254-20:2021)

Other adapter ends, when assembled in accordance with the manufacturer's instructions and pressure

tested according to the method in 5.2 for the intended application, shall show no signs of leakage or

permanent distortion. When re-tested in accordance with the test method in 5.2 for the intended

application 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.
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SIST EN 1254-7:2021
EN 1254-7:2021 (E)
4.11 Bore dimensions
To minimize flow resistance, minimum bore dimensions are required.

When assessed according to the method in 5.9, the minimum bore of the fitting, excluding any internal

tube support, shall be greater or equal to the values expressed in EN 1254-20:2021, 4.5, Table 9, for the

relevant nominal diameters.

For unequal-ended or adaptor fittings, the smallest diameter shall apply provided that this diameter

does not restrict other outlets.
4.12 Identity of elastomeric sealing material for liquid applications

During type testing, the method in 5.10 shall be used to establish the master reference thermogram for

the chosen sealing material.

The results of subsequent tests of the sealing material, carried out according to the method in 5.10, shall

be compared to the master reference thermogram to establish that the material is the same; any

differences shall be investigated. Results shall be retained for future comparison.

The identity relates to the elastomeric material and is independent of the fitting type, size or pattern.

4.13 Identity of elastomeric sealing material for gas applications

During type testing, the method in 5.11 shall be used to establish the master reference spectra for the

chosen sealing material.

The results of subsequent tests of the sealing material, carried out according to the method in 5.11, shall

be compared to the master reference spectra to establish that the material is the same; any differences

shall be investigated. Results shall be retained for future comparison.

The identity relates to the elastomeric material and is independent of the fitting type, size or pattern.

4.14 Tube abutment
This requirement does not apply to threaded ends.

Fitting ends are usually manufactured with an abutment to limit tube insertion and to retain a loose

supporti
...

SLOVENSKI STANDARD
oSIST prEN 1254-7:2019
01-september-2019

Baker in bakrove zlitine - Fitingi - 7. del: Fitingi s stiskalnimi priključki za spajanje

s kovinskimi cevmi

Copper and copper alloys - Plumbing fittings - Part 7: Press fittings for use with metallic

tubes

Kupfer und Kupferlegierungen - Fittings - Teil 7: Pressfittings für den Einsatz mit

metallischen Rohren

Cuivre et alliages de cuivre - Raccords - Partie 7 : Raccords à sertir pour tubes

métalliques
Ta slovenski standard je istoveten z: prEN 1254-7
ICS:
23.040.40 Kovinski fitingi Metal fittings
77.150.30 Bakreni izdelki Copper products
oSIST prEN 1254-7:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 1254-7:2019
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oSIST prEN 1254-7:2019
DRAFT
EUROPEAN STANDARD
prEN 1254-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
ICS 23.040.40
English Version
Copper and copper alloys - Plumbing fittings - Part 7: Press
fittings for use with metallic tubes

Cuivre et alliages de cuivre - Raccords - Partie 7 : Kupfer und Kupferlegierungen - Fittings - Teil 7:

Raccords à sertir pour tubes métalliques Pressfittings für den Einsatz mit metallischen Rohren

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, 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 1254-7:2019 E

worldwide for CEN national Members.
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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 8

4 Product characteristics ................................................................................................................................. 8

4.1 Internal pressure ............................................................................................................................................ 8

4.1.1 For liquid applications .................................................................................................................................. 8

4.1.2 For gas applications ....................................................................................................................................... 8

4.2 Tightness ............................................................................................................................................................ 8

4.2.1 General requirements ................................................................................................................................... 8

4.2.2 Requirements for liquid applications ...................................................................................................... 8

4.2.3 Requirements for gas applications ........................................................................................................... 9

4.3 Resistance to high temperature (for heating networks) ............................................................... 10

4.4 Release of dangerous substances ........................................................................................................... 10

4.5 Durability ........................................................................................................................................................ 10

4.5.1 Durability of internal pressure ............................................................................................................... 10

4.5.2 Durability of tightness ................................................................................................................................ 10

4.5.3 Durability of resistance to high temperature (for heating networks)...................................... 11

4.6 Wall thickness at threaded portions of adaptor fittings ................................................................ 11

4.7 Dimensions of tail pipe ends for swivel fittings ................................................................................ 11

4.8 Dimensions of gas union connectors .................................................................................................... 11

4.9 Threaded end dimensions ........................................................................................................................ 11

4.10 Other adapter ends (not defined in prEN 1254-20:2019) ............................................................. 12

4.11 Bore dimensions ........................................................................................................................................... 12

4.12 Identity of elastomeric sealing material for liquid applications ................................................ 13

4.13 Identity of elastomeric sealing material for gas applications ...................................................... 13

4.14 Tube abutment .............................................................................................................................................. 14

4.15 Alignment of the fitting ends .................................................................................................................... 14

4.16 Shapes for tightening systems ................................................................................................................. 14

4.17 Surface condition ......................................................................................................................................... 14

4.18 Plated or coated surfaces .......................................................................................................................... 14

5 Testing, assessment and sampling methods ...................................................................................... 14

5.1 General ............................................................................................................................................................. 14

5.1.1 Preparation of fittings for testing........................................................................................................... 14

5.1.2 Test temperature ......................................................................................................................................... 14

5.2 Internal pressure ......................................................................................................................................... 15

5.2.1 Internal hydrostatic pressure test ......................................................................................................... 15

5.2.2 Internal pneumatic pressure test........................................................................................................... 15

5.3 Tightness ......................................................................................................................................................... 15

5.3.1 General tests .................................................................................................................................................. 15

5.3.2 Tests for liquid applications .................................................................................................................... 16

5.3.3 Tests for gas applications .......................................................................................................................... 17

5.4 Durability ........................................................................................................................................................ 18

5.4.1 Durability of internal pressure ............................................................................................................... 18

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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)

5.4.2 Durability of tightness ................................................................................................................................ 18

5.4.3 Durability of resistance to high temperature (for heating networks) ...................................... 18

5.5 Wall thickness at threaded portions of adaptor fittings ................................................................ 18

5.5.1 Type testing .................................................................................................................................................... 18

5.5.2 FPC testing ....................................................................................................................................................... 19

5.6 Dimensions of tail pipe ends for swivel fittings ................................................................................. 19

5.7 Dimensions of gas union connectors ..................................................................................................... 19

5.7.1 Type testing .................................................................................................................................................... 19

5.7.2 FPC testing ....................................................................................................................................................... 19

5.8 Threaded end dimensions ......................................................................................................................... 19

5.9 Bore dimensions ........................................................................................................................................... 19

5.10 Identity of elastomeric sealing material for liquid applications ................................................. 19

5.11 Identity of elastomeric sealing material for gas applications ...................................................... 19

5.12 Alignment of the fitting ends .................................................................................................................... 19

6 Assessment and verification of constancy of performance - AVCP ............................................. 19

6.1 General ............................................................................................................................................................. 19

6.2 Type testing .................................................................................................................................................... 20

6.2.1 General ............................................................................................................................................................. 20

6.2.2 Test samples, testing and compliance criteria ................................................................................... 20

6.2.3 Test reports .................................................................................................................................................... 24

6.3 Factory production control (FPC) ........................................................................................................... 24

6.3.1 General ............................................................................................................................................................. 24

6.3.2 Requirements ................................................................................................................................................. 24

6.3.3 Product specific requirements ................................................................................................................ 29

6.3.4 Procedure for modifications ..................................................................................................................... 29

6.3.5 One-off products, pre-production products (e.g. prototypes) and products produced

in very low quantity ..................................................................................................................................... 29

7 Classification and designation ................................................................................................................. 30

8 Marking, labelling and packaging ........................................................................................................... 31

8.1 General ............................................................................................................................................................. 31

8.2 Additional marking ...................................................................................................................................... 31

8.3 Dezincification resistant copper zinc alloys ....................................................................................... 32

Annex A (normative) Maximum operating temperatures and maximum operating pressures ..... 33

Annex B (normative) Minimum nominal wall thicknesses of copper tube with R250 and

R290 temper conforming to EN 1057 suitable for jointing by press fittings .......................... 34

Bibliography ................................................................................................................................................................. 36

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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)
European foreword

This document (prEN 1254-7:2019) 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 part of the standard (EN 1254-7) 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 fittings for use with metallic tubes
— Part 8: Press fittings for use with plastics and multilayer pipes

— Part 20: Definitions, thread dimensions, test methods, reference data and supporting information

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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (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.
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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)
1 Scope

This document specifies product characteristics, assessment methods, compliance criteria and a

designation system for press fittings including their elastomeric seals, for connecting with metallic

tubes. The fitting ends have a size range from 6 mm to 108 mm. The press fittings are designed for a

service lifetime up to fifty years.

This document is applicable to press fittings for joining one or more of the following tubes:

— copper tubes to EN 1057 and
— stainless steel tubes to EN 10312
with wall thicknesses and tempers as specified by the manufacturer.

The fittings are used up to the operating temperatures and maximum operating pressures as indicated

in Annex A.

Press fittings are used with tubes with wall thicknesses greater than or equal to the wall thickness given

in Annex B, to ensure that tubes can withstand the radial pressing forces involved.

This document applies to copper alloy fittings. A non-exhaustive list of these copper alloys is given in

CEN/TS 13388.

Adaptor fittings for use with copper tubes may combine press ends with fitting ends defined in the

other parts of EN 1254.

Press fittings for use with metallic tubes may also have flanged end connections according to

EN 1092-3.

Press fittings for use with metallic tubes 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 standard are intended to be used in:
a) liquid applications:
— hot or 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.
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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)
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 549:1994, Rubber materials for seals and diaphragms for gas appliances and gas equipment

EN 681-1:1996, Elastomeric seals — Materials requirements for pipe joint seals used in water and

drainage applications — Part 1: Vulcanized rubber

EN 682, Elastomeric Seals — Materials requirements for seals used in pipes and fittings carrying gas and

hydrocarbon fluids

EN 723, Copper and copper alloys — Combustion method for determination of the carbon content on the

inner surface of copper tubes or fittings

EN 806 (series), Specifications for installations inside buildings conveying water for human consumption

EN 1057:2006+A1:2010, Copper and copper alloys — Seamless, round copper tubes for water and gas in

sanitary and heating applications

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

EN 1775:2007, 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 10312, Welded stainless steel tubes for the conveyance of aqueous liquids including water for human

consumption — Technical delivery conditions

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
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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)

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

ISO 9924-1, Rubber and rubber products — Determination of the composition of vulcanizates and uncured

compounds by thermogravimetry — Part 1: Butadiene, ethylene-propylene copolymer and terpolymer,

isobutene-isoprene, isoprene and styrene-butadiene rubbers
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
4.1.1 For liquid applications

When tested according to the method in 5.2.1 fittings shall show no signs of leakage or permanent

distortion.
4.1.2 For gas applications

When tested according to the method in 5.2.2 fittings shall show no signs of leakage or permanent

distortion.
4.2 Tightness
4.2.1 General requirements

4.2.1.1 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 5.3.1.1 fitting bodies shall show no visual indication of leakage.

4.2.2 Requirements for liquid applications
4.2.2.1 Leak tightness under internal hydrostatic pressure

Fittings assessed as indicated in 4.1.1 are considered to be leak tight under internal hydrostatic

pressure.
4.2.2.2 Resistance to pull-out

When tested according to the method in 5.3.2.1 the joint assemblies shall withstand the pull-out force

without being separated and shall show no signs of leakage when subjected to the subsequent leak

tightness under internal hydrostatic pressure test as described in 5.2.1.
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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)
4.2.2.3 Leak tightness under vibration

When tested according to the method in 5.3.2.2 fittings shall show no signs of leakage.

4.2.2.4 Leak tightness under vacuum

When tested according to the method in 5.3.2.3 the change in pressure shall not be greater than

0,05 bar at the conclusion of the test.
4.2.2.5 Leak tightness under temperature cycling

When tested according to the method in 5.3.2.4 fittings shall show no signs of leakage.

4.2.2.6 Leak before press

If the manufacturer claims this feature, then when tested according to the method in 5.3.2.5 fittings

shall leak at least one drop per second when tested with water or at least one bubble per second when

tested pneumatically.
4.2.3 Requirements for gas applications
4.2.3.1 Leak tightness under internal pneumatic pressure

Fittings assessed as indicated in 4.1.2 are considered to be leak tight under internal pneumatic

pressure.
4.2.3.2 Resistance to pull-out

When tested according to the method in 5.3.3.1 the joint assemblies shall withstand the pull-out force

without being separated and shall show no signs of leakage when subjected to the subsequent leak

tightness under internal pneumatic pressure test as described in 5.2.2.
4.2.3.3 Leak tightness under vibration

When tested according to the method in 5.3.3.2 fittings shall show no signs of leakage.

4.2.3.4 Leak tightness under static flexural force
This requirement is not applicable on threaded ends.

When tested according to the method in 5.3.3.3 fittings shall show no signs of leakage or permanent

distortion.
4.2.3.5 Leak tightness under temperature cycling

When tested according to the method in 5.3.3.4 fittings shall show no signs of leakage.

4.2.3.6 Leak before press

If the manufacturer claims this feature, then when tested according to the method in 5.3.3.5 fittings

shall leak at least one air bubble per second when tested pneumatically.
4.2.3.7 Press fitting suited for fuel gas application inside buildings

The main aspect for the durability of tightness for fuel gas application inside buildings is the ozone

behaviour of the elastomer. Therefore the elastomer shall be ozone resistant and comply with the

requirements of EN 549 class B2 or higher.
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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)
4.2.3.8 Press fitting suited for fuel gas application outside buildings

The main aspect for the durability of tightness for fuel gas application outside buildings depends on the

elastomeric sealing element. Therefore the elastomer shall comply with the requirements of EN 682

types GAL or GBL.
4.2.3.9 Leak tightness at high temperature

Only applies for fuel gas applications, to copper press fittings with only press ends and not for adaptor

fittings which also have a threaded end.

When tested according to the method in 5.3.3.6, at any point during the test period the nitrogen leakage

rate from an equal ended straight copper fitting shall not exceed 150 dm /h per tested product.

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.
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 Residual carbon contamination in the bore for liquid applications

This requirement only applies to copper fittings. This requirement does not apply to copper alloy

fittings.
4.5.2.1.1 Carbon film
When tested according to 5.4.2.1 there shall not be any visible carbon film.
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oSIST prEN 1254-7:2019
prEN 1254-7:2019 (E)
4.5.2.1.2 Total carbon

When tested according to 5.4.2.2 the maximum total carbon level on internal surfaces shall not exceed

1,0 mg/dm .
4.5.2.2 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 sam
...

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