prEN 14525

Ductile iron and steel wide tolerance couplings and flange adaptors for use with pipes of different materials: ductile iron, Grey iron, Steel, PVC-U, PVC-O, PE, Fibre-cement

This document specifies the requirements and associated test methods applicable to wide tolerance ductile iron and steel couplings, stepped/reducing couplings and flange adaptors intended for use with pipe components made from a number of pipe materials (ductile iron, grey iron, PE in conformity with EN 12201-1 to EN 12201-5, PVC-U in conformity with EN ISO 1452-1 to EN ISO 1452-5, steel, fibre-cement), for providing a leak tight seal over a wide range of pipe outside diameters:
-   to convey water (e.g. water intended for human consumption );
-   with or without pressure;
-   to be installed below or above ground, inside or outside buildings.
This document is not intended to cover sewerage or gas applications, where additional requirements may be necessary.
This document specifies requirements for materials, dimensions and tolerances, mechanical properties and standard coatings of products.
This document covers wide tolerance couplings, stepped/reducing couplings and flange adaptors:
-   Manufactured with socketed or flanged ends;
-   Supplied externally and internally coated;
-   Suitable for ductile iron in conformity with EN 545, grey iron, PE in conformity with EN 12201-1 to EN 12201-5, PVC-U in conformity with EN ISO 1452-1 to EN ISO 1452-5, steel, fibre-cement in a size range extending from DN 40 to DN 700, for an allowable operating pressure (PFA) up to 16 bar, for fluid temperatures between 0 °C and 25 °C excluding frost. For higher temperatures, (up to 45 °C for PVC-U or 40 °C for PE) the PFA is derated as given in EN ISO 1452 and EN 12201;
-   Not intended for use in areas subjected to reaction to fire regulations.
NOTE 1   This does not preclude special arrangements for the products to be used at higher temperatures. Temperature limitations and pressure limitations are those coming from the PVC-U or PE pipes.
This document covers ductile iron couplings, stepped/reducing couplings and flange adaptors cast by any type of foundry process or manufactured by fabrication of cast components, as well as corresponding joints, in a size range extending from DN 40 to DN 700, to be used with pipes of external diameter from 40 mm to 710 mm.
As long as no equivalent European Standard exists for steel accessories, this document also covers couplings and flange adaptors which are fabricated partly or entirely from steel as well as corresponding joints, in a size range extending from DN 60 to DN 700, to be used with pipes of external diameter from 63 mm to 710 mm.
This document specifies requirements for materials, dimensions and tolerances, mechanical properties and standard coatings. It also gives minimum performance requirements for all components, including restrained and non-restrained flexible joints. Joint design and gasket shapes are outside the scope of this document.
NOTE 2   PFA can be limited depending on pipe materials effectively connected.
NOTE 3   In this document, if not specified, all pressures are relative gauge pressures, expressed in bars (100 kPa = 1 bar).

Großbereichskupplungen und -flanschadapter aus duktilem Gusseisen zur Verbindung von Rohren aus unterschiedlichen Werkstoffen: Duktiles Gusseisen, Grauguss, Stahl, PVC-U, PE, Faserzement

Dieses Dokument legt die Anforderungen und die diesbezüglichen Prüfverfahren fest, die auf Großbereichskupplungen, gestufte/reduzierte Großbereichskupplungen und  flanschadapter aus duktilem Gusseisen und Stahl anwendbar sind, die zur Verwendung mit Rohrleitungsbauteilen aus einer Reihe von Werkstoffen (duktiles Gusseisen, Grauguss, PE in Übereinstimmung mit EN 12201 1 bis EN 12201 5, PVC U in Übereinstimmung mit EN ISO 1452 1 bis EN ISO 1452 5, Stahl, Faserzement) vorgesehen sind, um für einen großen Bereich von Rohr Außendurchmessern eine leckagefreie Abdichtung zu erreichen:
-   zum Transport von Wasser (z. B. Wasser für den menschlichen Gebrauch);
-   mit oder ohne Druck;
-   oberirdisch oder erdverlegt, innerhalb oder außerhalb von Gebäuden.
Dieses Dokument gilt nicht für Anwendungsfälle im Bereich der Abwasser  und Gasinstallationen, für die zusätzliche Anforderungen gelten können.
Diese Norm legt die Anforderungen an die Werkstoffe, Maße und Toleranzen, Festigkeitseigenschaften und die Standardbeschichtungen von Produkten fest.
Dieses Dokument enthält Großbereichskupplungen, gestufte/reduzierte Großbereichskupplungen und Flanschadapter:
-   gefertigt mit Muffen oder Flansch versehenen Enden;
-   mit Außen  und Innenbeschichtung geliefert;
-   geeignet für duktiles Eisen nach EN 545, Grauguss, PE nach EN 12201 1 bis EN 12201 5, PVC U nach EN ISO 1452 1 bis EN ISO 1452 5, Stahl, Faserzement in einem Nennweitenbereich von DN 40 bis DN 700 für einen zulässigen Bauteilbetriebsdruck (PFA) von bis zu 16 bar für Flüssigkeitstemperaturen zwischen 0 °C und 25 °C ohne Frost. Bei höheren Temperaturen (bis zu 45 °C für PVC U oder 40 °C für PE) wird die PFA nach EN ISO 1452 und EN 12201 herabgesetzt;
-   nicht für den Einsatz in Bereichen vorgesehen, die Brandschutzbestimmungen unterliegen.
ANMERKUNG 1   Das schließt keine besonderen Vorkehrungen für die Verwendung der Produkte aus, die bei höheren Temperaturen verwendet werden müssen. Temperatur  und Druckbeschränkungen sind die, die von den PVC U  oder PE Rohren ausgehen.
In diesem Dokument werden Kupplungen, gestufte/reduzierte Kupplungen und Flanschadapter aus duktilem Eisen behandelt, die durch jedes Gießverfahren gegossen oder mithilfe von Gussbauteilen gefertigt wurden, sowie entsprechende Verbindungen in einem Nennweitenbereich von DN 40 bis DN 700 mit Rohren mit einem Außendurchmesser von 40 mm bis 710 mm.
Solange es für Stahlzubehörteile keine gleichwertige europäische Norm gibt, umfasst dieses Dokument auch Kupplungen und Flanschadapter, die teilweise oder vollständig aus Stahl gefertigt sind, sowie entsprechende Verbindungen in einem Nennweitenbereich von DN 60 bis DN 700, die bei Rohren mit einem Außendurchmesser von 63 mm bis 710 mm angewendet werden müssen.
Dieses Dokument legt die Anforderungen an die Werkstoffe, Maße und Toleranzen, Festigkeitseigenschaften und die Standardbeschichtungen fest. Es enthält auch Mindestanforderungen an die Funktionstüchtigkeit für alle Bauteile, einschließlich beweglicher längskraftschlüssiger und nicht längskraftschlüssiger Verbindungen. Die Ausführung der Verbindungen und die Formen der Dichtungen fallen nicht in den Anwendungsbereich dieses Dokuments.
ANMERKUNG 2   Der zulässige Bauteilbetriebsdruck (PFA) kann je nach dem Werkstoff des angeschlossenen Rohres begrenzt sein.
ANMERKUNG 3   Wenn nicht anders festgelegt, sind in diesem Dokument alle Drücke relative Überdrücke und werden in bar angegeben (100 kPa = 1 bar).

Manchons et adaptateurs de brides à larges tolérances en fonte ductile destinés à être utilisés avec des tuyaux faits de différents matériaux : fonte ductile, fonte grise, acier, PVC-U, PE, fibre-ciment

Le présent document spécifie les prescriptions et les méthodes d’essai associées applicables aux manchons, aux manchons dissymétriques/de réduction et aux adaptateurs de brides à larges tolérances en fonte ductile et en acier, destinés à être utilisés avec des composants de tuyaux faits d’un certain nombre de matériaux (fonte ductile, fonte grise, PE en conformité avec les normes EN 12201-1 à EN 12201-5, PVC-U en conformité avec les normes EN ISO 1452-1 à EN ISO 1452-5, acier, fibre-ciment), afin d’assurer un assemblage étanche sur une large plage de diamètres extérieurs de tuyaux :
-   pour transporter de l’eau (par exemple de l’eau destinée à la consommation humaine) ;
-   avec ou sans pression ;
-   pour être installés dans le sol ou en aérien, à l’intérieur ou à l’extérieur des bâtiments.
Le présent document ne couvre pas les applications assainissement ou gaz, où des prescriptions supplémentaires peuvent être nécessaires.
Ce document spécifie les prescriptions relatives aux matériaux, aux dimensions et aux tolérances, aux propriétés mécaniques et aux revêtements normalisés des produits.
Le présent document couvre les manchons, les manchons dissymétriques/de réduction et les adaptateurs de brides à larges tolérances :
-   fabriqués avec des extrémités à emboîture ou à bride ;
-   livrés revêtus extérieurement et intérieurement ;
-   adaptés pour la fonte ductile en conformité avec l’EN 545, la fonte grise, le PE en conformité avec les normes EN 12201-1 à EN 12201-5, le PVC-U en conformité avec les normes EN ISO 1452-1 à EN ISO 1452-5, l’acier, la fibre-ciment pour la gamme des DN 40 à DN 700, pour une pression de fonctionnement admissible (PFA) allant jusqu’à 16 bar et des températures de fluide comprises entre 0 °C et 25 °C, hors gel. Pour des températures supérieures (jusqu’à 45 °C pour le PVC-U ou 40 °C pour le PE), la PFA est détimbrée conformément à l’EN ISO 1452 et à l’EN 12201 ;
-   non destinés à l’usage dans des domaines soumis une réglementation sur les risques d’incendie.
NOTE 1   Ceci n’exclut pas les dispositions spéciales permettant d’utiliser les produits à des températures plus élevées. Les limitations de température et de pression sont celles qui proviennent des tuyaux en PVC-U ou en PE.
Le présent document traite des manchons, des manchons dissymétriques/de réduction et des adaptateurs de brides en fonte ductile, coulés par tout procédé de fonderie ou fabriqués à partir de composants moulés, ainsi que les assemblages correspondants, pour la gamme des DN 40 à DN 700, à utiliser avec des tuyaux de diamètre extérieur allant de 40 mm à 710 mm.
Dans la mesure où aucune Norme européenne équivalente n’existe pour les accessoires en acier, le présent document traite également des manchons et des adaptateurs de brides fabriqués à partir d’acier, ainsi que les assemblages correspondants, pour la gamme des DN 60 à DN 700, à utiliser avec des tuyaux de diamètre extérieur allant de 63 mm à 710 mm.
Ce document spécifie les prescriptions relatives aux matériaux, aux dimensions et aux tolérances, aux propriétés mécaniques et aux revêtements normalisés. Il indique également des prescriptions de performance minimales pour tous les composants, y compris les assemblages flexibles verrouillés ou non. La conception des assemblages et la forme des garnitures de joints sortent du domaine d’application du présent document.
NOTE 2   Selon le matériau de tuyau effectivement assemblé, la PFA peut être réduite.
NOTE 3   Dans ce document, si cela n’est pas précisé, toutes les pressions sont des pressions relatives, exprimées en bars (100 kPa = 1 bar).

Spojke in prirobnične prilagoditve široke uporabe za cevi iz različnih materialov: duktilne litine, sive litine (z lamelastim grafitom), jekla, PVC-U, PE, vlaknatega cementa

General Information

• Status: Not Published
• ICS: 23.040.60 - Flanges, couplings and joints
• Technical Committee: CEN/TC 203 - Cast iron pipes, fittings and their joints
• Drafting Committee: CEN/TC 203/WG 1 - Water pipelines under pressure
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Due Date: 17-Dec-2021
• Completion Date: 17-Dec-2021
• Ref Project: oSIST prEN 14525:2020 - Ductile iron wide tolerance couplings and flange adaptors for use with pipes of different materials: ductile iron, Grey iron, Steel, PVC-U, PE, Fibre-cement

RELATIONS

• Revised: EN 14525:2004 - Ductile iron wide tolerance couplings and flange adaptors for use with pipes of different materials: ductile iron, Grey iron, Steel, PVC-U PE, Fibre-cement
• Effective Date: 26-Apr-2017

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 14525:2020
01-september-2020

Spojke in prirobnične prilagoditve široke uporabe za cevi iz različnih materialov:

duktilne litine, sive litine (z lamelastim grafitom), jekla, PVC-U, PE, vlaknatega

cementa

Ductile iron wide tolerance couplings and flange adaptors for use with pipes of different

materials: ductile iron, Grey iron, Steel, PVC-U, PE, Fibre-cement
Großbereichskupplungen und -flanschadapter aus duktilem Gusseisen zur Verbindung

von Rohren aus unterschiedlichen Werkstoffen: Duktiles Gusseisen, Grauguss, Stahl,

PVC-U, PE, Faserzement

Adaptateurs de brides et manchons a larges tolérances en fonte ductile destinés a etre

utilisés avec des tuyaux faits de différents matériaux : fonte ductile, fonte grise, acier,

PVC-U, PE, fibre-ciment
Ta slovenski standard je istoveten z: prEN 14525
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
oSIST prEN 14525:2020 en,fr,de

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

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oSIST prEN 14525:2020
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oSIST prEN 14525:2020
DRAFT
EUROPEAN STANDARD
prEN 14525
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2020
ICS 23.040.60 Will supersede EN 14525:2004
English Version
Ductile iron wide tolerance couplings and flange adaptors
for use with pipes of different materials: ductile iron, Grey
iron, Steel, PVC-U, PE, Fibre-cement
Großbereichskupplungen und -flanschadapter aus
duktilem Gusseisen zur Verbindung von Rohren aus
unterschiedlichen Werkstoffen: Duktiles Gusseisen,
Grauguss, Stahl, PVC-U, PE, Faserzement

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 203.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14525:2020 E

worldwide for CEN national Members.
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oSIST prEN 14525:2020
prEN 14525:2020 (E)
Contents Page

European foreword ...................................................................................................................................................... 3

1 Scope ......................................................................................................................................................................... 4

2 Normative references ......................................................................................................................................... 5

3 Terms and definitions ......................................................................................................................................... 6

4 Technical requirements ..................................................................................................................................... 9

4.1 General ................................................................................................................................................................... 9

4.2 Dimensional requirements ...........................................................................................................................11

4.3 Material Characteristics .................................................................................................................................14

4.4 Coatings ................................................................................................................................................................15

4.5 Product information ........................................................................................................................................15

4.6 Leak tightness ....................................................................................................................................................16

5 Performance requirements for joints .........................................................................................................16

5.1 General .................................................................................................................................................................16

5.2 Pressure rating ..................................................................................................................................................17

5.3 Leak tightness of flexible joints ...................................................................................................................17

5.4 Restrained flexible joints ..............................................................................................................................18

5.5 Long term hydrostatic strength test ..........................................................................................................21

5.6 Flanged joints .....................................................................................................................................................22

6 Test methods ........................................................................................................................................................23

6.1 Tensile testing ...................................................................................................................................................23

6.2 Brinell hardness ................................................................................................................................................24

6.3 Works leak tightness test ..............................................................................................................................24

7 Performance tests ..............................................................................................................................................24

7.1 Leak tightness of joints to positive internal pressure.........................................................................24

7.2 Leak tightness of joints to negative internal pressure .......................................................................26

7.3 Leak tightness of joints to dynamic internal pressure .......................................................................26

7.4 Long term hydrostatic strength test for joints for PE pipes ..............................................................27

7.5 Pull out test at 25 ºC for restrained joints for PE pipes ......................................................................27

7.6 Long term hydrostatic strength test for joints of fittings for PVC-U pipe.....................................28

Annex A (informative) Outside diameters of existing pipes........................................................................29

Annex B (informative) Quality assurance ...........................................................................................................31

Bibliography .................................................................................................................................................................32

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oSIST prEN 14525:2020
prEN 14525:2020 (E)
European foreword

This document (prEN 14525:2020) has been prepared by Technical Committee CEN/TC 203 “Cast iron

pipes, fittings and accessories”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14525:2004.
The significant changes made since the previous version are:
— Allowance of steel as material (as EN 12842);
— Introduction of type test for ductile iron in delivery conditions;
— Introduction of long term testing for PVC-U and PE (as per EN 12842);
— Correction on pressure testing depending on pipe material (as per EN 12842);
— Wording and paragraphs harmonized with EN 12842 and EN 545.

This document is in conformity with the general requirements already established by CEN/TC 164 in the

field of water supply.

In respect of potential adverse effects on the quality of water intended for human consumption caused

by the product covered by this document:

— this document provides no information as to whether the product may be used without restriction

in any of the member states of the EU or EFTA;

— it should be noted that, while awaiting the adoption of verifiable European criteria, existing national

regulations concerning the use and/or the characteristics of these product remain in force.

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oSIST prEN 14525:2020
prEN 14525:2020 (E)
1 Scope

This document specifies the requirements and associated test methods applicable to wide tolerance

ductile iron and steel couplings, stepped/reducing couplings and flange adaptors intended for use with

pipe components made from a number of pipe materials (ductile iron, grey iron, PE in conformity with

EN 12201-1 to EN 12201-5, PVC-U in conformity with EN ISO 1452-1 to EN ISO 1452-5, steel, fibre-

cement), for providing a leak tight seal over a wide range of pipe outside diameters:

— to convey water (e.g. water intended for human consumption );
— with or without pressure;
— to be installed below or above ground, inside or outside buildings.

This document is not intended to cover sewerage or gas applications, where additional requirements may

be necessary.

This document specifies requirements for materials, dimensions and tolerances, mechanical properties

and standard coatings of products.

This document covers wide tolerance couplings, stepped/reducing couplings and flange adaptors:

— Manufactured with socketed or flanged ends;
— Supplied externally and internally coated;

— Suitable for ductile iron in conformity with EN 545, grey iron, PE in conformity with EN 12201-1 to

EN 12201-5, PVC-U in conformity with EN ISO 1452-1 to EN ISO 1452-5, steel, fibre-cement in a size

range extending from DN 40 to DN 700, for an allowable operating pressure (PFA) up to 16 bar, for

fluid temperatures between 0 °C and 25 °C excluding frost. For higher temperatures, (up to 45 °C for

PVC-U or 40 °C for PE) the PFA is derated as given in EN ISO 1452 and EN 12201;
— Not intended for use in areas subjected to reaction to fire regulations.

NOTE 1 This does not preclude special arrangements for the products to be used at higher temperatures.

Temperature limitations and pressure limitations are those coming from the PVC-U or PE pipes.

This document covers ductile iron couplings, stepped/reducing couplings and flange adaptors cast by any

type of foundry process or manufactured by fabrication of cast components, as well as corresponding

joints, in a size range extending from DN 40 to DN 700, to be used with pipes of external diameter from

40 mm to 710 mm.

As long as no equivalent European Standard exists for steel accessories, this document also covers

couplings and flange adaptors which are fabricated partly or entirely from steel as well as corresponding

joints, in a size range extending from DN 60 to DN 700, to be used with pipes of external diameter from

63 mm to 710 mm.

This document specifies requirements for materials, dimensions and tolerances, mechanical properties

and standard coatings. It also gives minimum performance requirements for all components, including

restrained and non-restrained flexible joints. Joint design and gasket shapes are outside the scope of this

document.
NOTE 2 PFA can be limited depending on pipe materials effectively connected.

NOTE 3 In this document, if not specified, all pressures are relative gauge pressures, expressed in bars

(100 kPa = 1 bar).
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oSIST prEN 14525:2020
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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 545, Ductile iron pipes, fittings, accessories and their joints for water pipelines - Requirements and test

methods

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

applications - Part 1: Vulcanized rubber
EN 805, Water supply - Requirements for systems and components outside buildings

EN 1092-2, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN

designated - Part 2: Cast iron flanges

EN 1514 (all parts), Flanges and their joints - Dimensions of gaskets for PN-designated flanges.

EN 10025-1:2004, Hot rolled products of structural steels - Part 1: General technical delivery conditions

EN 10310, Steel tubes and fittings for onshore and offshore pipelines - Internal and external polyamide

powder based coatings

EN 12201 (all parts), Plastics piping systems for water supply, and for drainage and sewerage under

pressure - Polyethylene (PE)

EN 14901-1, Ductile iron pipes, fittings and accessories - Requirements and test methods for organic

coatings of ductile iron fittings and accessories - Part 1: Epoxy coating (heavy duty)

EN 15189, Ductile iron pipes, fittings and accessories - External polyurethane coating for pipes -

Requirements and test methods

EN 15655-1, Ductile iron pipes, fittings and accessories - Requirements and test methods for organic

linings of ductile iron pipes and fittings - Part 1: Polyurethane lining of pipes and fittings

EN ISO 1452(all parts), Plastic piping systems for water supply and for buried and above-ground drainage

and sewerage under pressure - Unplasticized poly(vinyl chloride) (PVC-U)
EN ISO 4016, Hexagon head bolts - Product grade C (ISO 4016)
EN ISO 4034, Hexagon regular nuts (style 1) - Product grade C (ISO 4034)

EN ISO 6506-1, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1)

EN ISO 6892-1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO

6892-1)
EN ISO 7091, Plain washers - Normal series - Product grade C (ISO 7091)

EN ISO 11177, Vitreous and porcelain enamels - Inside and outside enamelled valves and pressure pipe

fittings for untreated and potable water supply - Quality requirements and testing (ISO 11177)

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oSIST prEN 14525:2020
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
3.1
ductile iron

cast iron used for pipes, fittings and accessories in which graphite is present substantially in spheroidal

form
3.2
fitting and accessory

casting or manufactured steel component other than a pipe which allows pipeline deviation, change of

direction or bore

Note 1 to entry: Flanged-socket pieces, flanged spigot pieces are also classified as fittings (EN 545) as far as their

dimension are defined in EN 545. As they have no dimensional requirement in EN 545 couplings, stepped/reducing

couplings and flange adaptors are defined as accessories in EN 545.
3.3
flange

end of a pipe or fitting extending perpendicular to its axis, with bolt holes equally spaced on a circle

Note 1 to entry: A flange may be fixed (e.g. integrally cast or welded-on) or adjustable; an adjustable flange

comprises a ring, in one or several parts assembled together, which bears on an end joint hub and can be freely

rotated around the axis before jointing. See EN 545.
3.4
spigot
male end of a pipe or fitting
3.5
socket

female end of a pipe or fitting to make the connection with the spigot of the next component

3.6
gasket
sealing component of a joint
3.7
joint

connection between the ends of two pipes and/or fittings in which a gasket is used to effect a seal

3.8
flexible joint

joint which permits significant angular deflection both during and after installation and which can accept

a slight offset of the centreline
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oSIST prEN 14525:2020
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3.9
push-in flexible joint

flexible joint assembled by pushing the spigot through the gasket in the socket of the mating component

3.10
mechanical flexible joint

flexible joint in which sealing is obtained by applying pressure to the gasket by mechanical means, e.g. a

gland
3.11
restrained flexible joint

flexible joint in which a means is provided to prevent axial separation of the assembled joint

3.12
flanged joint
joint between two flanged ends
3.13
joint angular deflection

angle between the axis of two connected pipeline components which a flexible joint can accommodate

3.14
joint gap/ withdrawal

axial distance between any point of the spigot ends of the pipes to be connected, when aligned (couplings,

stepped/reducing couplings), or, axial distance between any point of the spigot end of the pipe and the

flange face, when aligned (flange adaptor)

Note 1 to entry: See also 4.2.3. The word joint gap is used for accessories where withdrawal is used for socketed

pipes as per EN 545.
3.15
depth of engagement

when jointed, the distance between the end of the spigot and the face of the socket on a couplings,

stepped/reducing couplings and flange adaptors
Note 1 to entry: See also 4.2.3.
3.16
outside diameter

outside diameter of the pipe(s) to be connected and current designation of PVC-U and PE diameter

designation
3.17
nominal size

alphanumerical designation of size for components of a pipework system, which is used for reference

purposes

Note 1 to entry: It comprises the letters DN followed by a dimensionless whole number which is indirectly related

to the physical size, in millimetres, of the bore or outside diameter of the end connections.

Note 2 to entry: See EN ISO 6708.
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3.18
nominal pressure

alphanumerical designation used for reference purposes related to a combination of mechanical and

dimensional characteristics of a component of a pipework system

Note 1 to entry: It comprises the letters PN followed by a dimensionless number. (See EN 1333.)

Note 2 to entry: All equipment of the same nominal size DN designated by the same PN number have compatible

mating dimensions.
3.19
leak tightness test pressure

pressure applied to a component during manufacture in order to ensure its leak tightness

3.20
allowable operating pressure
PFA

maximum hydrostatic pressure that a component is capable of withstanding continuously in service

Note 1 to entry: See EN 805.

Note 2 to entry: In EN ISO 1452 and EN 12201, the term nominal pressure (PN) at 20 °C is used in place of PFA.

3.21
allowable maximum operating pressure
PMA

maximum pressure occurring from time to time, including surge, that a component is capable of

withstanding in service
Note 1 to entry: See EN 805.
3.22
allowable test pressure
PEA

maximum hydrostatic pressure that a newly installed component is capable of withstanding for a

relatively short duration, in order to insure the integrity and tightness of the pipeline

Note 1 to entry: See EN 805.
3.23
performance test

proof of design test which is done once and is repeated after change of design or change of elastomeric

or plastic components (source or grade)
3.24
wide tolerance flange adaptor
accessory intended for use with pipes of various materials which:

— is used in a pipeline to make the connection with a spigot of a pipe or a fitting and the flange of

another component of the pipeline (e.g. pipe, fitting, valve, etc.); and

— allows for angular and axial displacements for unrestrained joints and angular displacements for

restrained flexible joints
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Note 1 to entry: Some flange adaptors are designed such that they can be slid over the pipes in order to facilitate

easy assembly.
3.25
wide tolerance coupling
accessory intended for use with pipes of various materials which:

— is used in a pipeline to make the connection between two spigots of pipes, fittings or valves, etc. of

the same nominal size; and

— allows for angular and axial displacements for unrestrained joints and angular displacements for

restrained flexible joints
3.26
wide tolerance stepped or reducer coupling

wide tolerance coupling intended for use with pipeline components of different nominal sizes

3.27
annulus gap

gap between the sealing surfaces of the gasket chamber and of the outside diameter of the pipe that is

inserted into the socket of the coupling, stepped / reducing coupling or flange adaptor

4 Technical requirements
4.1 General
4.1.1 Diameter range

The diameter range of wide tolerance couplings and flange adaptors is defined by the maximum and

minimum outside diameters of the pipes to be connected. Within this diameter range the performance

shall be guaranteed at the Manufacturers declared PFA.
The preferred PFA's are 6 bars, 10 bars and 16 bars.

The minimum diameter range of wide tolerance couplings and flange adaptors is given in Table 1.

NOTE The diameter range of wide tolerance couplings, stepped/reducing couplings and flange adaptors is

applicable to the accessory and is not to be confused with the diameter tolerances of the pipes.

Table 1 — Minimum diameter range
Maximum OD or DN of the pipes Minimum
to be connected diameter range
OD (mm) DN (mm)
OD ≤ 110 DN ≤ 100 10
110 < OD ≤ 225 100 225 < OD ≤ 315 200 < DN ≤ 300 20
315 < OD ≤ 400 300 < DN ≤ 400 25
400 < OD ≤ 710 400 < DN ≤ 700 30

The working range defined by the minimum and the maximum outside diameter range shall be specified

by the manufacturer.
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Informative Annex A gives the outside diameters of existing pipes, according to current ISO, EN or

national standards.
4.1.2 Surface condition and repairs

Wide tolerance couplings, stepped / reducing couplings and wide tolerance flange adaptors shall be free

from defects and surface imperfections which could lead to non-compliance with Clauses 4 and 5.

When necessary, couplings, stepped / reducing couplings and wide tolerance flange adaptors may be

repaired, for example by welding, in order to remove surface imperfections and localised defects which

do not extend through the entire wall thickness, provided that:
— the repairs are carried out according to the manufacturer’s written procedure;

— the repaired couplings and flange adaptors comply with all the requirements of Clauses 4 and 5.

4.1.3 Types of joints and interconnection
4.1.3.1 General

Rubber gasket materials shall comply with the requirements of EN 681-1 for the type WA.

4.1.3.2 Flexible joints

Flexible joints, restrained or non-restrained, shall meet the performance requirements detailed in

Clause 5.

The manufacturer shall declare for which pipe materials restrained joints may be used.

Due to the effect that temperature and pressure has on PE pipe and the associated tensile loads, all joints

intended for use on this pipe material shall be restrained and meet the requirements of 5.4 and 5.5.

Supporting sleeves (inserts) may be necessary depending on pipe material, on pipe wall thickness, on

joint design and on local authorities. They shall provide adequate support over the entire compression

area of the gasket and restraining mechanism.
4.1.3.3 Flanged joints

Flanged joints shall be constructed in such a way that they may be attached to flanges whose dimensions

and tolerances comply with EN 1092-2. This ensures interconnection between all flanged components

(pipes, fittings, valves, etc.) of the same PN and DN and adequate joint performance.

Bolts and nuts shall comply as a minimum with the requirements of EN ISO 4016 and EN ISO 4034, grade

4.6. Where washers are required they shall comply with EN ISO 7091.

Although it does not affect interconnection, the manufacturer shall state whether their products are

normally delivered with fixed flanges or adjustable flanges.
Flange gaskets may be one of any type given in EN 1514 (all parts).

Flanges may be designed to be compatible with different DN (e.g. DN 50-60-65) and/or different PN (e.g.

PN 10/16).

Certain flange adaptors, especially for repair purposes, are designed to cater for flanges other than

EN 1092-2. Consequently, some dimensions (e.g. thickness, bolt holes) may be designed to suit. Such

flange adaptors shall not compromise functionality or compatibility with EN 1092-2 flanges.

4.1.4 Materials in contact with water intended for human consumption

Wide tolerance couplings, stepped / reducing couplings and wide tolerance flange adaptors include

several materials given in this document. When used under the conditions for which they are designed,

in permanent or in temporary contact with water intended for human consumption, wide tolerance

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couplings, stepped / reducing couplings and wide tolerance flange adaptors shall not change the quality

of that water to such an extent that it fails to comply with the requirements of national regulations.

For this purpose, reference shall be made to the relevant national regulations and standards, transposing

EN standards when available, dealing with the influence of materials on water quality, and to the

requirements for external systems and components as given in EN 805.
4.2 Dimensional requirements
4.2.1 Minimum wall thickness of ductile iron couplings and flange adaptors

The minimum wall thickness of the ductile iron, at any point, shall be as given in Table 2, provided that

the requirements of 4.3, 4.6 and Clause 7 are complied with.
Table 2 — Minimum wall thickness
Maximum OD or DN of the pipes Minimum wall
to be connected thickness
OD (mm) DN (mm)
OD ≤ 225 DN ≤ 200 4,0
225 < OD ≤ 315 200 < DN ≤ 300 5,0
315

NOTE The thickness given in Table 2 is the minimum wall thickness corresponding to the main part of the

body. The actual thickness at any particular point may need to be increased to meet localized high stresses

depending on the shape of the casting (e.g. at internal radius of bends, at the branch-body junction of tees...).

4.2.2 Minimum wall thickness of steel couplings and flange adaptors

When material complies with 4.3.2 the minimum wall thickness of the steel, at any point, shall be as given

in Table 3, provided that the requirements of 4.3, 4.6 and 7 are complied with.
Table 3— Minimum wall thickness of mild steel couplings and flange adaptors
OD Minimum wall thickness
for material grade as
specified in 4.3.2
OD ≤ 315 3,0
315 < OD ≤ 560 4,0
560 < OD ≤ 710 5,0

For higher grade materials it is permissible to use thicknesses less than specified in Table 3 with an

absolute minimum of 3 mm.
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4.2.3 Joint gap and depth of engagement

The manufacturer shall declare the maximum joint gap for couplings, stepped / reducing couplings and

flange adaptors, see Figure 1, and it shall not be less than the values given in Table 4.

The manufacturer shall declare both the minimum and maximum depth of engagement in the installation

instructions.
The minimum depth of engagement shall be such that:
— the pipes can support the loads imparted by the jointing/anchorage system;

— with full angular deflection and, in the case of non-restrained joints the pipe fully contracted due to

thermal changes, there is no chance of the gasket being forced off the end of the pipe – i.e. the pipe

comes out of the coupling, stepped / reducing coupling or flange adaptor.
The maximum depth of engagement shall be such that:
— with maximum angular deflection and,
...