SIST EN 1254-7:2021
(Main)Copper and copper alloys - Plumbing fittings - Part 7: Press fittings for use with metallic tubes
Copper and copper alloys - Plumbing fittings - Part 7: Press fittings for use with metallic tubes
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.
Kupfer und Kupferlegierungen - Fittings - Teil 7: Pressfittings für den Einsatz mit metallischen Rohren
Dieses Dokument legt Produkteigenschaften, Bewertungsverfahren, Übereinstimmungskriterien der Prüfergebnisse und ein Bezeichnungssystem für Pressfittings, einschließlich ihrer elastomeren Dichtungen, zur Verbindung mit Metallrohren fest. Die Fittingenden haben einen Nenndurchmesser von 6 mm bis 108 mm. Die Pressfittings sind für eine Lebensdauer von bis zu fünfzig Jahren ausgelegt.
Dieses Dokument ist anzuwenden 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 ist anzuwenden 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 maschinelles Bearbeiten, Umformen, Gießen oder Fügen von Vormaterial hergestellt werden.
Die unter dieses Dokument fallenden Produkte sind für den Einsatz bestimmt in:
a) Flüssigkeitsanwendungen:
— warmes, kaltes oder kombiniertes Warm- und Kaltwasser, einschließlich Systeme nach EN 806;
— geschlossene Heizungsanlagen nach EN 12828;
— Kühlsysteme;
— Entwässerungssysteme;
— Brandbekämpfungsanlagen einschließlich Sprinkleranlagen nach EN 12845;
— Versorgungsanlagen für Verbrauchsstellen mit flüssigen Brennstoffen nach EN 12514.
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 des résultats d’essai 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 un diamètre nominal compris 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 des duretés spécifiées par le fabricant.
Les raccords sont utilisés jusqu'aux températures de service et aux pressions maximales de service
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 le présent document 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, y compris
les systèmes conformes à l’EN 806 ;
- les systèmes de chauffage fermés conformes à l'EN 12828 ;
- les systèmes de refroidissement ;
- les systèmes de purge ;
- les systèmes de protection contre l’incendie, y compris les systèmes d'extinction de type
sprinkleur conformes à l’EN 12845 ;
- les systèmes d'approvisionnement des points de consommation en combustibles liquides
conformes à l’EN 12514.
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
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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.
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
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
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.
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.
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.
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
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.
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.
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.
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.
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
supporting sleeve, if used.
Fittings may be produced for special purposes, particularly useful for repairs, where the fitting ends do
not incorporate abutments, allowing for the fitting to slide along the tube.
The dimensions of the abutment shall be such that it will stop the smallest possible tube. The abutment
shall also satisfy the minimum bore requirement as stated in 4.10.
4.15 Alignment of the fitting ends
When tested according to the method in 5.12, the alignment of the fitting ends with reference to the
specified axis shall be within ± 2 °.
4.16 Shapes for tightening systems
When visually inspected, fittings with threads shall have a shape or suitable features for the
transmission of tightening torques.
4.17 Surface condition
When visually inspected, fittings shall be free from sharp edges or burrs.
4.18 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
Unless otherwise stated, the fittings to be tested shall be assembled with the relevant metallic tube in
accordance with the manufacturer’s instructions and the minimum nominal wall thicknesses stated in
Annex B, Table B.1 or Table B.2 according to the temper.
All sizes of fitting and each tube material (and hardest and softest temper), unless otherwise specified,
shall be tested.
A support sleeve may be required with R220 copper tubes, please refer to manufacturer's instructions.
The fittings shall be assembled and tested with the tube as specified by the manufacturer.
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 EN 1254-20:2021, Annex A.
5.1.2 Test temperature
Tests shall be conducted at a temperature of (23 ± 5) °C unless otherwise stated.
5.1.3 Tolerances
When tolerances are not specified, the values shall be within ± 5 % of the nominal value.
5.2 Internal pressure
5.2.1 Internal hydrostatic pressure test
Use the test method described in EN 1254-20:2021, Clause 5 using the parameters shown in Table 1.
Table 1 — Internal hydrostatic pressure test parameters
Free length of the tube a in
Test pressure Test duration
the test assembly
mm bar h
100 1,5 × the maximum operating pressure 1
NOTE Use the maximum pressure specified for 30 °C in Table A.1 for liquid applications.
5.2
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