Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3: Fittings

This document specifies the characteristics of fusion fittings made from polyethylene (PE) as well as of mechanical fittings for piping systems in the field of the supply of gaseous fuels.
It also specifies the test parameters for the test methods referred to in this standard.
In conjunction with Parts 1, 2, 4 and 5 of EN 1555, it is applicable to PE fittings, their joints and to joints with components of PE and other materials intended to be used under the following conditions:
a)   a maximum operating pressure, MOP, up to and including 10 bar;
b)   an operating temperature of 20 °C as reference temperature.
NOTE 1   For other operating temperatures, derating coefficients should be used; see EN 1555-5.
EN 1555 (all parts) covers a range of maximum operating pressures and gives requirements concerning colours and additives.
NOTE 2   It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.
This document is applicable for fittings of the following types:
c)   electrofusion socket fittings;
d)   electrofusion saddle fittings;
e)   spigot end fittings (for butt fusion using heated tools and electrofusion socket fusion);
f)   mechanical fittings.
The fittings can e.g. be in the form of couplers, equal and reduced tees, reducers, bends or caps.

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 3: Formstücke

Dieses Dokument legt die Eigenschaften von Formstücken aus Polyethylen (PE) für Schweißverbindungen und an Formstücke für mechanische Verbindungen fest, die in Rohrleitungssystemen im Bereich der Versorgung mit gasförmigen Brennstoffen eingesetzt werden.
Es legt auch die Prüfparameter für die Prüfverfahren fest, auf die in diesem Dokument verwiesen wird.
In Verbindung mit Teil 1, Teil 2, Teil 4 und Teil 5 von EN 1555 gilt es für Formstücke aus PE, deren Verbindungen untereinander sowie mit Rohrleitungsteilen aus PE und anderen Werkstoffen, die für die Verwendung unter den folgenden Bedingungen vorgesehen sind:
a)   der maximal zulässige Betriebsdruck MOP (en: maximum operating pressure) beträgt höchstens 10 bar );
ANMERKUNG 1   Für die Anwendung dieses Dokumentes und unter Bezugnahme auf ISO 17885 kann der MOP als Nenndruck angesehen werden.
b)   es gilt eine Betriebstemperatur von 20 °C als Bezugstemperatur.
ANMERKUNG 2   Für andere Betriebstemperaturen können Minderungsfaktoren verwendet werden, siehe EN 1555 5.
EN 1555 (alle Teile) deckt einen Bereich von maximal zulässigen Betriebsdrücken ab und enthält Anforderungen bezüglich Farben und Zusatzstoffen.
ANMERKUNG 3   Es liegt in der Verantwortung des Auftraggebers oder Planers, aus diesen Gesichtspunkten die geeignete Auswahl zu treffen, unter Berücksichtigung ihrer speziellen Anforderungen und jeglicher maßgebender nationaler Festlegungen und Verfahrensweisen oder Vorschriften für die Verlegung.
Dieses Dokument ist für die folgenden Arten von Formstücken anwendbar:
c)   Formstücke für Heizwendelschweißung;
d)   Formstücke mit Schweißenden (für Heizelementstumpfschweißung unter Verwendung von Heizelementen und Heizwendel Schweißmuffen);
e)   mechanische Klemmverbinder.
ANMERKUNG 4   Die Formstücke können beispielsweise als Verbindungsstücke, T-Stücke mit gleichem und reduziertem Abzweig, Reduzierstücke, Bögen oder Verschlussstücke ausgeführt sein.

Systèmes de canalisations en plastique pour la distribution de combustibles gazeux - Polyéthylène (PE) - Partie 3 : Raccords

Le présent document spécifie les caractéristiques des raccords soudables en polyéthylène (PE) ainsi que celles des raccords mécaniques fabriqués pour les systèmes de canalisations destinées à la distribution de combustibles gazeux.
Il spécifie également les paramètres d’essai pour les méthodes d’essai référencées dans ce document.
Conjointement avec les Parties 1, 2, 4 et 5 de l’EN 1555, il s’applique aux raccords en PE et à leurs assemblages, ainsi qu’aux assemblages avec des composants en PE et en d’autres matières destinés à être utilisés dans les conditions suivantes :
a)   une pression maximale de service, MOP, jusqu’à et y compris 10 bar   ;
NOTE 1   Pour les besoins du présent document et en référence à l’ISO 17885, la MOP peut être considérée comme la pression nominale.
b)   une température de service de 20 °C comme température de référence.
NOTE 2   Pour d’autres températures de service, des facteurs de réduction peuvent être utilisés ; voir l’EN 1555 5.
L’EN 1555 (toutes les parties) couvre une gamme de pressions maximales de service et donne les exigences concernant les couleurs et les additifs.
NOTE 3   Il est de la responsabilité de l’acheteur ou du prescripteur d’effectuer les choix appropriés à partir de ces données, en tenant compte des exigences particulières et de toute réglementation nationale applicable ainsi que des pratiques ou codes de pose.
Le présent document est applicable aux raccords des types suivants :
c)   raccords à emboîture électrosoudable ;
d)   raccords à bout mâle (pour soudage bout à bout à l’aide d’outils chauffants et pour soudage par emboîture électrosoudable) ;
e)   raccords de compression mécaniques.
NOTE 4   Les raccords peuvent être, par exemple, des manchons, des tés égaux, des tés réduits, des réductions, des coudes ou des bouchons.

Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen (PE) - 3. del: Fitingi

General Information

Status
Published
Public Enquiry End Date
19-Dec-2019
Publication Date
22-Jul-2021
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Jul-2021
Due Date
23-Sep-2021
Completion Date
23-Jul-2021

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SLOVENSKI STANDARD
SIST EN 1555-3:2021
01-september-2021
Nadomešča:
SIST EN 1555-3:2010+A1:2013

Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen

(PE) - 3. del: Fitingi

Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3:

Fittings

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 3:

Formstücke

Systèmes de canalisations en plastique pour la distribution de combustibles gazeux -

Polyéthylène (PE) - Partie 3 : Raccords
Ta slovenski standard je istoveten z: EN 1555-3:2021
ICS:
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
SIST EN 1555-3:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 1555-3:2021
---------------------- Page: 2 ----------------------
SIST EN 1555-3:2021
EN 1555-3
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2021
EUROPÄISCHE NORM
ICS 23.040.45 Supersedes EN 1555-3:2010+A1:2012
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 3: Fittings

Systèmes de canalisations en plastique pour la Kunststoff-Rohrleitungssysteme für die Gasversorgung

distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 3: Formstücke

(PE) - Partie 3 : Raccords
This European Standard was approved by CEN on 7 June 2021.

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 1555-3:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1555-3:2021
EN 1555-3:2021 (E)
Contents Page

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

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

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

3 Terms and definitions ................................................................................................................................... 9

4 Symbols and abbreviations ....................................................................................................................... 10

5 Material ............................................................................................................................................................ 10

5.1 Compound for fittings ................................................................................................................................. 10

5.2 Material for non-polyethylene parts ...................................................................................................... 10

5.2.1 General .............................................................................................................................................................. 10

5.2.2 Metal parts ....................................................................................................................................................... 10

5.2.3 Sealing materials ........................................................................................................................................... 10

5.2.4 5.2.4 Other materials ................................................................................................................................... 11

6 General characteristics ............................................................................................................................... 11

6.1 Appearance ..................................................................................................................................................... 11

6.2 Colour ................................................................................................................................................................ 11

6.3 Design ................................................................................................................................................................ 11

6.4 Appearance of factory made joints ......................................................................................................... 11

6.5 Electrical characteristics for electrofusion fittings .......................................................................... 11

7 Geometric characteristics .......................................................................................................................... 12

7.1 Measurement of dimensions..................................................................................................................... 12

7.2 Dimensions of electrofusion socket fittings ........................................................................................ 12

7.2.1 Diameters and lengths of electrofusion sockets ................................................................................ 12

7.2.2 Wall thicknesses ............................................................................................................................................ 14

7.2.3 Out-of-roundness of the bore of a fitting (at any point).................................................................. 14

7.2.4 Spigots ............................................................................................................................................................... 14

7.2.5 Other dimensions.......................................................................................................................................... 14

7.3 Dimensions of electrofusion saddle fittings ........................................................................................ 15

7.4 Dimensions of spigot end fittings ............................................................................................................ 15

7.4.1 Diameters and lengths ................................................................................................................................ 15

7.4.2 Wall thickness of the fusion end .............................................................................................................. 18

7.4.3 Wall thickness of the fitting body............................................................................................................ 18

7.4.4 Other dimensions.......................................................................................................................................... 18

7.5 Design and dimensions of mechanical fittings ................................................................................... 18

7.5.1 General .............................................................................................................................................................. 18

7.5.2 Mechanical fittings with polyethylene spigot ends .......................................................................... 18

7.5.3 Mechanical fittings with polyethylene electrofusion sockets ....................................................... 18

7.5.4 Threads ............................................................................................................................................................. 18

8 Mechanical characteristics ........................................................................................................................ 18

8.1 General .............................................................................................................................................................. 18

8.2 Requirements ................................................................................................................................................. 19

8.3 Performance requirements ....................................................................................................................... 22

9 Physical characteristics .............................................................................................................................. 23

9.1 Conditioning ................................................................................................................................................... 23

9.2 Requirements ................................................................................................................................................. 23

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SIST EN 1555-3:2021
EN 1555-3:2021 (E)

10 Performance requirements ...................................................................................................................... 23

11 Technical file .................................................................................................................................................. 24

12 Marking ............................................................................................................................................................ 24

12.1 General ............................................................................................................................................................. 24

12.2 Minimum required marking of fittings ................................................................................................. 25

12.3 Additional marking ...................................................................................................................................... 25

12.4 Fusion system recognition ........................................................................................................................ 25

13 Delivery conditions ...................................................................................................................................... 26

Annex A (informative) Examples of typical terminal connection for electrofusion fittings ............. 27

Annex B (normative) Short-term pressure test method ............................................................................... 30

Annex C (normative) Tensile test for fitting/pipe assemblies .................................................................... 32

Bibliography ................................................................................................................................................................. 33

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SIST EN 1555-3:2021
EN 1555-3:2021 (E)
European foreword

This document (EN 1555-3:2021) has been prepared by Technical Committee CEN/TC 155 “Plastics

piping systems and ducting systems”, the secretariat of which is held by NEN.

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 January 2022, and conflicting national standards shall

be withdrawn at the latest by January 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 1555-3:2010+A1:2012.

In comparison with the previous version, the following technical modifications have been introduced:

— PE 100-RC type materials with enhanced resistance to slow crack growth have been added.

— Annex A of EN 1555-1:2021 now discusses the performance of this type of material and gives

additional information for non-conventional installation techniques.

— Additional information for non-conventional installation techniques has been added.

— The size range has been increased to 800 mm diameter.
— Test methods have been updated.

System Standards are based on the results of the work being undertaken in ISO/TC 138 “Plastics pipes,

fittings and valves for the transport of fluids”, which is a Technical Committee of the International

Organization for Standardization (ISO).

They are supported by separate standards on test methods to which references are made throughout the

System Standard.

The System Standards are consistent with general standards on functional requirements and on

recommended practice for installation.
EN 1555 consists of the following parts:

— EN 1555-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) —

Part 1: General;

— EN 1555-2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes;

— EN 1555-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) —

Part 3: Fittings (this standard);

— EN 1555-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves;

— EN 1555-5, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness

for purpose of the system;

— CEN/TS 1555-7, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) —

Part 7: Guidance for assessment of conformity.

NOTE EN 12007-2 [1], prepared by CEN/TC 234 “Gas infrastructure”, deals with the recommended practice

for installation of plastics pipes system in accordance with EN 1555 (all parts).

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SIST EN 1555-3:2021
EN 1555-3:2021 (E)

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,

Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United

Kingdom.
---------------------- Page: 7 ----------------------
SIST EN 1555-3:2021
EN 1555-3:2021 (E)
Introduction

This document, specifies the requirements for a piping system and its components made from

polyethylene (PE) and which is intended to be used for the supply of gaseous fuels.

Requirements and test methods for material and components, other than fittings, are specified in

EN 1555-1:2021, EN 1555-2:2021 and EN 1555-4:2021.

Characteristics for fitness for purpose are covered in EN 1555-5:2021. CEN/TS 1555-7 [2] gives guidance

for assessment of conformity. Recommended practice for installation is given in EN 12007-2 [1] prepared

by CEN/TC 234.
This part of EN 1555 covers the characteristics of fittings.
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SIST EN 1555-3:2021
EN 1555-3:2021 (E)
1 Scope

This document specifies the characteristics of fusion fittings made from polyethylene (PE) as well as of

mechanical fittings for piping systems in the field of the supply of gaseous fuels.

It also specifies the test parameters for the test methods referred to in this document.

In conjunction with Parts 1, 2, 4 and 5 of EN 1555, it is applicable to PE fittings, their joints and to joints

with components of PE and other materials intended to be used under the following conditions:

a) a maximum operating pressure, MOP, up to and including 10 bar at a reference temperature of 20 °C

for design purposes;
b) an operating temperature between −20 °C and 40 °C.

NOTE 1 For operating temperatures between 20 °C and 40 °C, derating coefficients are defined in

EN 1555-5:2021.

EN 1555 (all parts) covers a range of maximum operating pressures and gives requirements concerning

colours.

NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these

aspects, taking into account their particular requirements and any relevant national regulations and installation

practices or codes.
This document is applicable for fittings of the following types:
a) electrofusion socket fittings;
b) electrofusion saddle fittings;

c) spigot end fittings (for butt fusion using heated tools and electrofusion socket fusion);

d) mechanical fittings.

NOTE 3 The fittings can be, for example, in the form of couplers, equal and reduced tees, reducers, saddles,

elbows or caps.
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 682, Elastomeric Seals - Materials requirements for seals used in pipes and fittings carrying gas and

hydrocarbon fluids

EN 1555-1:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 1: General

EN 1555-2:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 2: Pipes

EN 1555-5:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 5: Fitness

for purpose of the system
1 5 2
1 bar = 0,1 MPa. = 10 Pa; 1 MPa = 1 N/mm .
---------------------- Page: 9 ----------------------
SIST EN 1555-3:2021
EN 1555-3:2021 (E)

EN 1716, Plastics piping systems - Polyethylene (PE) tapping tees - Test method for impact resistance of an

assembled tapping tee

EN 10226-1, Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external

threads and parallel internal threads - Dimensions, tolerances and designation

EN 10226-2, Pipe threads where pressure tight joints are made on the threads - Part 2: Taper external

threads and taper internal threads - Dimensions, tolerances and designation

EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions,

tolerances and designation (ISO 228-1)

EN ISO 1133-1, Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)

of thermoplastics - Part 1: Standard method (ISO 1133-1)

EN ISO 1167-1:2006, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids -

Determination of the resistance to internal pressure - Part 1: General method (ISO 1167-1:2006)

EN ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination

of the resistance to internal pressure - Part 4: Preparation of assemblies (ISO 1167-4)

EN ISO 3126, Plastics piping systems - Plastics components - Determination of dimensions (ISO 3126)

EN ISO 11357-6, Plastics - Differential scanning calorimetry (DSC) - Part 6: Determination of oxidation

induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)

EN ISO 17778, Plastics piping systems - Fittings, valves and ancillaries - Determination of gaseous flow

rate/pressure drop relationships (ISO 17778)

ISO 13950, Plastics pipes and fittings - Automatic recognition systems for electrofusion joints

ISO 13951, Plastics piping systems - Test method for the resistance of plastic pipe/pipe or pipe/fitting

assemblies to tensile loading

ISO 13953, Polyethylene (PE) pipes and fittings - Determination of the tensile strength and failure mode of

test pieces from a butt-fused joint

ISO 13954, Plastics pipes and fittings - Peel decohesion test for polyethylene (PE) electrofusion assemblies

of nominal outside diameter greater than or equal to 90 mm

ISO 13955, Plastics pipes and fittings - Crushing decohesion test for polyethylene (PE) electrofusion

assemblies

ISO 13956, Plastics pipes and fittings - Decohesion test of polyethylene (PE) saddle fusion joints - Evaluation

of ductility of fusion joint interface by tear test

ISO 17885, Plastics piping systems - Mechanical fittings for pressure piping systems – Specification

ISO 18488, Polyethylene (PE) materials for piping systems - Determination of Strain Hardening Modulus in

relation to slow crack growth - Test method
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SIST EN 1555-3:2021
EN 1555-3:2021 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions, symbols and abbreviations given in

EN 1555-1:2021 and the following apply.

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

• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
electrofusion socket fitting

polyethylene (PE) fitting which contains one or more integral heating elements, that are capable of

transforming electrical energy into heat to realize a fusion joint with a spigot end or a pipe

3.2
electrofusion saddle fitting

polyethylene (PE) fitting which contains one or more integral heating elements, that are capable of

transforming electrical energy into heat to realise a fusion joint onto a pipe
3.2.1
tapping tee

electrofusion saddle fitting (top loading or wrap round) which contains an integral cutter, to cut through

the wall of the main pipe, which remains in the body of this fitting
3.2.2
branch saddle

electrofusion saddle fitting (top loading or wrap round) which requires an ancillary cutting tool for

drilling a hole in the adjoining main pipe
3.3
mechanical fitting

fitting, that generally includes a compression part to provide pressure integrity, leak tightness and

resistance to end loads, for assembling polyethylene (PE) pipe to another PE pipe or any other element

of the piping system

Note 1 to entry: A pipe-supporting sleeve providing a permanent support for a polyethylene (PE) pipe to prevent

creep in the pipe wall under radial compressive forces, is applicable. The metallic parts of the fitting can be

assembled to metallic pipes by screw-threads, compression joints, welded or flanged connections. In some cases the

supporting sleeve at the same time constitutes a grip ring.

Note 2 to entry: The fitting can allow either a dismountable or permanently assembled joint.

Note 3 to entry: The mechanical fitting can be supplied for field assembly, typically as a material transition fitting,

or pre-assembled by the manufacturer.
3.4
spigot end fitting

polyethylene (PE) fitting where the outside diameter of the spigot end is equal to the nominal outside

diameter, d , of the corresponding pipe
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SIST EN 1555-3:2021
EN 1555-3:2021 (E)
4 Symbols and abbreviations

For the purpose of this document the symbols and abbreviations given in EN 1555-1:2021 apply.

5 Material
5.1 Compound for fittings

The PE compound from which the fittings are made shall be in accordance with EN 1555-1:2021.

The stress bearing parts shall only be made from virgin material conforming to EN 1555-1:2021.

Non-stress bearing PE parts shall be made from virgin material or reworked material from a compound

with the same MRS or a mixture of both materials.
5.2 Material for non-polyethylene parts
5.2.1 General

All components shall conform to the relevant EN standard(s). Alternative standards may be applied in

cases where the suitable EN standard(s) do not exist. In all cases, fitness for purpose of the components

shall be demonstrated.

The materials and the constituent elements used in making the fitting (including elastomers and any

metal parts as may be used) shall be as resistant to the external and internal environments as the other

elements of the piping system, and shall have an expected lifetime under the following conditions at least

equal to that of the PE pipes conforming to EN 1555-2:2021 with which they are intended to be used:

a) during storage;
b) under the effect of the gas conveyed therein;
c) with respect to the service environment and operating conditions.

The requirements for the level of material performance of non-polyethylene parts shall be at least as

stringent as that of the PE compound for the piping system. Reworked materials shall not be used for

stress bearing polymeric parts.

Non-stress bearing fitting parts, e.g. clamps for electrofusion saddle fittings, that only maintain a function

during installation, are made from other materials or polyethylene.

Other materials used in fittings in contact with the PE pipe shall not adversely affect pipe performance or

initiate stress cracking.
5.2.2 Metal parts

All metal parts susceptible to corrosion shall be adequately protected, providing this is necessary for the

durability and function of the system.

When dissimilar metallic materials are used which can be in contact with moisture, steps shall be taken

to avoid the possibility of galvanic corrosion.
5.2.3 Sealing materials
Elastomeric seals shall conform to EN 682.

If other sealing materials are used, they need to be proven for gas supply systems.

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SIST EN 1555-3:2021
EN 1555-3:2021 (E)
5.2.4 5 Other materials

Greases or lubricants shall not exude onto fusion areas, and shall not affect the long-term performance of

fitting materials.
6 General characteristics
6.1 Appearance

When viewed without magnification, the internal and external surfaces of fittings shall be clean and shall

have no scoring, cavities and other surface defects to an extent that would prevent conformity to this

document.

No component of the fitting shall show any signs of damage, scratches, pitting, bubbles, blisters,

inclusions or cracks to an extent that would prevent conformity of the fittings to the requirements of this

document.
6.2 Colour
The colour of the PE parts of fittings shall be either black, yellow, or orange.
6.3 Design

The design of the fitting shall be such that, when assembling the fitting onto the pipe or other component,

electrical coils and/or seals are not displaced.

Tapping tees may be provided with upper and lower end stops for the drill, or other means of indicating

the drill position according to manufacturer’s instructions.

Tapping tees may be provided with a means to prevent uncontrolled gas release during tapping.

6.4 Appearance of factory made joints

The internal and external surfaces of the pipe and fitting after fusion jointing, examined visually without

magnification, shall be free from melt exudation outside the confines of the fitting, apart from that which

may be declared acceptable by the fitting manufacturer or used deliberately as a fusion marker.

Any melt exudation shall not cause wire movement in electrofusion fittings such that it leads to short-

circuiting, when jointed in accordance with the manufacturer's instructions. There shall be no excessive

creasing of the internal surfaces of the adjoining pipes.
6.5 Electrical characteristics for electrofusion fittings

The electrical protection that shall be provided by the fusion process depends on the voltage and the

current used and on the characteristics of the electricity power source.

For voltages greater than 25 V, direct human contact with energized parts shall not be possible when the

fitting is in the fusion cycle during assembly in accordance with the instructions of the manufacturers of

the fittings and of the assembly equipment, as applicable.

NOTE 1 The fitting is part of an electrical system during the fusion process as defined in EN 60335-1 [3],

HD 60364-1 [4] and IEC 61140 [5].

The tolerance on the electrical resistance of the fitting at 23 °C shall be stated by the manufacturer. The

resistance shall be between nominal resistance (−10 %) and nominal resistance [(+10 %) + 0,1 Ω].

NOTE 2 0,1 Ω is the assumed value of the contact resistance.

The surface finish of the terminal pins shall allow a minimum contact resistance in order to satisfy the

resistance tolerance requirements.
NOTE 3 See Annex A, for examples of typical electrofusion terminal connections.
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SIST EN 1555-3:2021
EN 1555-3:2021 (E)
7 Geometric characteristics
7.1 Measurement of dim
...

SLOVENSKI STANDARD
oSIST prEN 1555-3:2019
01-december-2019

Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen

(PE) - 3. del: Fitingi

Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3:

Fittings

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 3:

Formstücke

Systèmes de canalisations en plastique pour la distribution de combustibles gazeux -

Polyéthylène (PE) - Partie 3 : Raccords
Ta slovenski standard je istoveten z: prEN 1555-3
ICS:
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
oSIST prEN 1555-3:2019 en,fr,de

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

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oSIST prEN 1555-3:2019
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oSIST prEN 1555-3:2019
DRAFT
EUROPEAN STANDARD
prEN 1555-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2019
ICS 23.040.45 Will supersede EN 1555-3:2010+A1:2012
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 3: Fittings

Systèmes de canalisations en plastique pour la Kunststoff-Rohrleitungssysteme für die Gasversorgung

distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 3: Formstücke

(PE) - Partie 3 : Raccords

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

CEN/TC 155.

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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1555-3:2019 E

worldwide for CEN national Members.
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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)
Contents Page

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

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

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

2 Normative references .................................................................................................................................... 6

3 Terms and definitions, symbols and abbreviations ........................................................................... 8

4 Material .............................................................................................................................................................. 9

4.1 PE Compound ................................................................................................................................................... 9

4.2 Material for non-polyethylene parts ........................................................................................................ 9

4.2.1 General ................................................................................................................................................................ 9

4.2.2 Metal parts ......................................................................................................................................................... 9

4.2.3 Elastomers ......................................................................................................................................................... 9

4.2.4 Other materials ................................................................................................................................................ 9

5 General characteristics ............................................................................................................................... 10

5.1 Appearance ..................................................................................................................................................... 10

5.2 Colour ................................................................................................................................................................ 10

5.3 Design ................................................................................................................................................................ 10

5.4 Appearance of factory made joints ......................................................................................................... 10

5.5 Electrical characteristics for electrofusion fittings .......................................................................... 10

6 Geometrical characteristics ...................................................................................................................... 10

6.1 Measurement of dimensions..................................................................................................................... 10

6.2 Dimensions of electrofusion socket fittings ........................................................................................ 11

6.2.1 Diameters and lengths of electrofusion sockets ................................................................................ 11

6.2.2 Wall thicknesses ............................................................................................................................................ 13

6.2.3 Out-of-roundness of the bore of a fitting (at any point).................................................................. 13

6.2.4 Spigots ............................................................................................................................................................... 13

6.2.5 Other dimensions.......................................................................................................................................... 13

6.3 Dimensions of electrofusion saddle fittings ........................................................................................ 14

6.4 Dimensions of spigot end fittings ............................................................................................................ 14

6.4.1 Diameters and lengths ................................................................................................................................ 14

6.4.2 Wall thickness of the fusion end .............................................................................................................. 17

6.4.3 Wall thickness of the fitting body............................................................................................................ 17

6.4.4 Other dimensions.......................................................................................................................................... 17

6.5 Dimensions of mechanical fittings .......................................................................................................... 17

6.5.1 General .............................................................................................................................................................. 17

6.5.2 Mechanical fittings with polyethylene spigot ends .......................................................................... 17

6.5.3 Mechanical fittings with polyethylene electrofusion sockets ....................................................... 17

6.5.4 Threads ............................................................................................................................................................. 17

7 Mechanical characteristics ........................................................................................................................ 18

7.1 General .............................................................................................................................................................. 18

7.2 Requirements ................................................................................................................................................. 18

7.3 Performance requirements ....................................................................................................................... 21

8 Physical characteristics .............................................................................................................................. 21

8.1 Conditioning ................................................................................................................................................... 21

8.2 Requirements ................................................................................................................................................. 22

9 Performance requirements ....................................................................................................................... 22

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prEN 1555-3:2019 (E)

10 Technical file .................................................................................................................................................. 22

11 Marking ............................................................................................................................................................ 23

11.1 General ............................................................................................................................................................. 23

11.2 Minimum required marking of fittings ................................................................................................. 23

11.3 Additional marking ...................................................................................................................................... 24

11.4 Fusion system recognition ........................................................................................................................ 24

12 Delivery conditions ...................................................................................................................................... 24

Annex A (informative) Examples of typical terminal connection for electrofusion fittings ............. 25

Annex B (normative) Short-term pressure test method ............................................................................... 27

B.1 Principle ........................................................................................................................................................... 27

B.2 Apparatus ........................................................................................................................................................ 27

B.3 Test piece ......................................................................................................................................................... 27

B.4 Procedure ........................................................................................................................................................ 27

B.5 Test report ...................................................................................................................................................... 28

Annex C (normative) Tensile test for fitting/pipe assemblies .................................................................... 29

C.1 Principle ........................................................................................................................................................... 29

C.2 Apparatus ........................................................................................................................................................ 29

C.3 Test piece ......................................................................................................................................................... 29

C.4 Procedure ........................................................................................................................................................ 29

C.5 Test report ...................................................................................................................................................... 29

Bibliography ................................................................................................................................................................. 30

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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)
European foreword

This document (prEN 1555-3:2019) has been prepared by Technical Committee CEN/TC 155 “Plastics

piping systems and ducting systems”, the secretariat of which is held by NEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1555-3:2010+A1:2012.
EN 1555 consists of the following parts:

— EN 1555-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1:

General;

— EN 1555-2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes;

— EN 1555-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3:

Fittings (this standard);

— EN 1555-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4:

Valves;

— EN 1555-5, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5:

Fitness for purpose of the system;

— CEN/TS 1555-7, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 7:

Guidance for assessment of conformity.

NOTE EN 12007-2:2012 [1] prepared by CEN/TC 234 “Gas infrastructure” deals with the recommended

practice for installation of plastics pipes system in accordance with EN 1555 (all parts).

System Standards are based on the results of the work being undertaken in ISO/TC 138 “Plastics pipes,

fittings and valves for the transport of fluids”, which is a Technical Committee of the International

Organization for Standardization (ISO).

They are supported by separate standards on test methods to which references are made throughout the

System Standard.

The System Standards are consistent with general standards on functional requirements and on

recommended practice for installation.
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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)
Introduction

This document, specifies the requirements for a piping system and its components made from

polyethylene (PE) and which is intended to be used for the supply of gaseous fuels.

Requirements and test methods for material and components, other than fittings, are specified in

prEN 1555-1:2019, prEN 1555-2:2019 and prEN 1555-4:2019.

Characteristics for fitness for purpose are covered in prEN 1555-5:2019. CEN/TS 1555-7 [2] gives

guidance for assessment of conformity. Recommended practice for installation is given in

EN 12007-2:2012 [1] prepared by CEN/TC 234.
This part of EN 1555 covers the characteristics of fittings.
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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)
1 Scope

This document specifies the characteristics of fusion fittings made from polyethylene (PE) as well as of

mechanical fittings for piping systems in the field of the supply of gaseous fuels.

It also specifies the test parameters for the test methods referred to in this document.

In conjunction with Parts 1, 2, 4 and 5 of EN 1555, it is applicable to PE fittings, their joints and to joints

with components of PE and other materials intended to be used under the following conditions:

a) a maximum operating pressure, MOP, up to and including 10 bar ;

NOTE 1 For the purpose of this document and referring to ISO 17885, MOP can be considered to be nominal

pressure.
b) an operating temperature of 20 °C as reference temperature.

NOTE 2 For other operating temperatures, derating coefficients can be used; see EN 1555-5.

EN 1555 (all parts) covers a range of maximum operating pressures and gives requirements concerning

colours and additives.

NOTE 3 It is the responsibility of the purchaser or specifier to make the appropriate selections from these

aspects, taking into account their particular requirements and any relevant national regulations and installation

practices or codes.
This document is applicable for fittings of the following types:
c) electrofusion fittings;

d) spigot end fittings (for butt fusion using heated tools and electrofusion socket fusion);

e) mechanical compression fittings.

NOTE 4 The fittings can be, for example, in the form of couplers, equal and reduced tees, reducers, bends or caps.

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

hydrocarbon fluids

prEN 1555-1:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1:

General

prEN 1555-2:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2:

Pipes

prEN 1555-5:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5:

Fitness for purpose of the system
1 1 bar = 0,1 MPa.
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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)

EN 1716, Plastics piping systems — Polyethylene (PE) tapping tees — Test method for impact resistance of

an assembled tapping tee

EN 10226-1, Pipe threads where pressure tight joints are made on the threads — Part 1: Taper external

threads and parallel internal threads — Dimensions, tolerances and designation

EN 10226-2, Pipe threads where pressure tight joints are made on the threads — Part 2: Taper external

threads and taper internal threads — Dimensions, tolerances and designation

EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,

tolerances and designation (ISO 228-1)

EN ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate

(MVR) of thermoplastics (ISO 1133-1)

EN ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination

of the resistance to internal pressure — Part 1: General method (ISO 1167-1)

EN ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination

of the resistance to internal pressure — Part 4: Preparation of assemblies (ISO 1167-4)

EN ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions (ISO 3126)

EN ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation

induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)

ISO 13950, Plastics pipes and fittings — Automatic recognition systems for electrofusion joints

ISO 13951, Plastics piping systems — Test method for the resistance of polyolefin pipe/pipe or pipe/fitting

assemblies to tensile loading

ISO 13953, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure mode

of test pieces from a butt-fused joint

ISO 13954, Plastics pipes and fittings — Peel decohesion test for polyethylene (PE) electrofusion assemblies

of nominal outside diameter greater than or equal to 90 mm

ISO 13955, Plastics pipes and fittings — Crushing decohesion test for polyethylene (PE) electrofusion

assemblies

ISO 13956, Plastics pipes and fittings — Determination of cohesive strength — Evaluation of ductility of

fusion joint interface by tear test

ISO 17778, Plastics piping systems — Fittings, valves and ancillaries — Determination of gaseous flow

rate/pressure drop relationships

ISO 17885:2015, Plastics piping systems – Mechanical fittings for pressure piping systems – Specifications

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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)
3 Terms and definitions, symbols and abbreviations

For the purposes of this document, the terms and definitions, symbols and abbreviations given in

prEN 1555-1:2019 and the following 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
3.1
electrofusion socket fitting

polyethylene (PE) fitting which contains one or more integral heating elements, that are capable of

transforming electrical energy into heat to realise a fusion joint with a spigot end or a pipe

3.2
electrofusion saddle fitting

polyethylene (PE) fitting which contains one or more integral heating elements, that are capable of

transforming electrical energy into heat to realise a fusion joint onto a pipe
3.2.1
tapping tee

electrofusion saddle fitting (top loading or wrap round) which contains an integral cutter, to cut through

the wall of the main pipe which remains in the body of the tapping tee after installation

3.2.2
branch saddle

electrofusion saddle fitting (top loading or wrap round) which requires an ancillary cutting tool for

drilling a hole in the adjoining main pipe
3.3
mechanical fitting

fitting, that generally includes a compression part to provide pressure integrity, leaktightness and

resistance to end loads, for assembling polyethylene (PE) pipe to another PE pipe or any other element

of the piping system

Note 1 to entry: A pipe-supporting sleeve providing a permanent support for a polyethylene (PE) pipe to prevent

creep in the pipe wall under radial compressive forces, is applicable. The metallic parts of the fitting can be

assembled to metallic pipes by screw-threads, compression joints, welded or flanged connections, including PE

flanges. In some cases the supporting sleeve at the same time constitutes a grip ring

Note 2 to entry: The fitting can allow either a dismountable or permanently assembled joint

Note 3 to entry: The mechanical fitting can be supplied for field assembly or pre-assembled by the manufacturer

3.4
spigot end fitting

polyethylene (PE) fitting where the outside diameter of the spigot end is equal to the nominal outside

diameter, d , of the corresponding pipe
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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)
4 Material
4.1 PE Compound

The PE compound from which the fittings are made shall be in accordance with EN 1555-1.

The stress bearing parts shall only be made from virgin material conforming to EN 1555-1.

Non-stress bearing PE parts shall be made from virgin material or own reprocessed material from a

compound with the same MRS or a mixture of both materials.
4.2 Material for non-polyethylene parts
4.2.1 General

All components shall conform to the relevant EN standard(s). Alternative standards may be applied in

cases where the suitable EN standard(s) do not exist. In all cases, fitness for purpose of the components

shall be demonstrated.

The materials and the constituent elements used in making the fitting (including elastomers and any

metal parts as may be used) shall be as resistant to the external and internal environments as the other

elements of the piping system and shall have a life expectancy under the following conditions at least

equal to that of the PE pipes conforming to EN 1555-2with which they are intended to be used:

a) during storage;
b) under the effect of the gas conveyed therein;
c) with respect to the service environment and operating conditions.

The requirements for the level of material performance of non-polyethylene parts shall be at least as

stringent as that of the PE compound for the piping system. Reprocessed materials shall not be used for

stress bearing polymeric parts.

Other materials used in fittings in contact with the PE pipe shall not adversely affect pipe performance or

initiate stress cracking.
NOTE Subclause 4.2 does not apply to non-stress bearing fitting parts.
4.2.2 Metal parts

All metal parts susceptible to corrosion shall be adequately protected, providing this is necessary for the

durability and function of the system.

When dissimilar metallic materials are used which can be in contact with moisture, steps shall be taken

to avoid the possibility of galvanic corrosion.
4.2.3 Elastomers
Elastomeric seals shall conform to EN 682.
Other sealing materials are permitted if suitable for gas service.
4.2.4 Other materials

Greases or lubricants shall not exude onto fusion areas, and shall not affect the long-term performance of

fitting materials.
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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)
5 General characteristics
5.1 Appearance

When viewed without magnification, the internal and external surfaces of fittings shall be smooth, clean

and shall have no scoring, cavities and other surface defects to an extent that would prevent conformity

to this document.

No component of the fitting shall show any signs of damage, scratches, pitting, bubbles, blisters,

inclusions or cracks to an extent that would prevent conformity of the fittings to the requirements of this

document.
5.2 Colour
The colour of the PE parts of fittings shall be either black, yellow, or orange.
5.3 Design

The design of the fitting shall be such that, when assembling the fitting onto the pipe or other component,

electrical coils and/or seals are not displaced.
5.4 Appearance of factory made joints

The internal and external surfaces of the pipe and fitting after fusion jointing, examined visually without

magnification, shall be free from melt exudation outside the confines of the fitting, apart from that which

may be declared acceptable by the fitting manufacturer or used deliberately as a fusion marker.

Any melt exudation shall not cause wire movement in electrofusion fittings such that it leads to short-

circuiting, when jointed in accordance with the manufacturer's instructions. There shall be no excessive

creasing of the internal surfaces of the adjoining pipes.
5.5 Electrical characteristics for electrofusion fittings

The electrical protection that shall be provided by the fusion process depends on the voltage and the

current used and on the characteristics of the electricity power source.

For voltages greater than 25 V, direct human contact with energized parts shall not be possible when the

fitting is in the fusion cycle during assembly in accordance with the instructions of the manufacturers of

the fittings and of the assembly equipment, as applicable.

NOTE 1 The fitting is during the fusion process part of an electrical system as defined in EN 60335-1 [3],

HD 60364-1 [4] and IEC 60449 [5].

The tolerance on the electrical resistance of the fitting at 23 °C shall be stated by the manufacturer. The

resistance shall be between nominal resistance (−10 %) and nominal resistance (+10 %) + 0,1 Ω.

NOTE 2 0,1 Ω is the assumed value of the contact resistance.

The surface finish of the terminal pins shall allow a minimum contact resistance in order to satisfy the

resistance tolerance requirements.
NOTE 3 See Annex A, for examples of typical electrofusion terminal connections.
6 Geometrical characteristics
6.1 Measurement of dimensions

The dimensions of the fittings shall be measured in accordance with EN ISO 3126 at (23 ± 2) °C, after

being conditioned for at least 4 h. The measurement shall not be made less than 24 h after manufacture.

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oSIST prEN 1555-3:2019
prEN 1555-3:2019 (E)

Indirect measurement at the stage of production is allowed at shorter time periods providing evidence is

shown of correlation.
6.2 Dimensions of electrofusion socket fittings
6.2.1 Diameters and lengths of electrofusion sockets
For electrofusion sockets (see Figure 1) havi
...

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