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

This part of EN 1555 specifies the general aspects of polyethylene (PE) 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 2 to 5 of EN 1555 it is applicable to PE pipes, fittings, and valves, their joints and to joints with components of 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 [6].
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.

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 1: Allgemeines

Dieses Dokument legt die allgemeinen Gesichtspunkte von Rohrleitungssystemen aus Polyethylen (PE) im Bereich der Versorgung mit gasförmigen Brennstoffen fest.
Es legt auch die Prüfparameter für die Prüfverfahren fest, auf die in diesem Dokument verwiesen wird.
In Verbindung mit EN 1555, Teil 2 bis Teil 5, gilt dieses Dokument für Rohre, Formstücke und Armaturen aus PE, deren Verbindungen untereinander sowie mit Rohrleitungsteilen aus 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 );
b)   es gilt eine Betriebstemperatur von 20 °C als Bezugstemperatur.
ANMERKUNG 1   Für andere Betriebstemperaturen können Minderungsfaktoren verwendet werden, siehe prEN 1555 5:2019 [1].
EN 1555 (alle Teile) deckt einen Bereich von maximal zulässigen Betriebsdrücken ab und enthält Anforderungen bezüglich Farben.
ANMERKUNG 2   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.

Systèmes de canalisations en plastique pour la distribution de combustibles gazeux - Polyéthylène (PE) - Partie 1 : Généralités

Le présent document spécifie les aspects généraux des systèmes de canalisations en polyéthylène (PE) dans le domaine de 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 2 à 5 de l’EN 1555, le présent document s’applique aux tubes, raccords et robinets en PE et à leurs assemblages, ainsi qu’aux assemblages avec des composants 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   ;
b)   une température de service de 20 °C comme température de référence.
NOTE 1   Pour d’autres températures de service, des facteurs de réduction peuvent être utilisés ; voir le prEN 1555 5:2019 [1].
L’EN 1555 (toutes les parties) couvre une gamme de pressions maximales de service et donne les exigences concernant les couleurs.
NOTE 2   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.

Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen (PE) - 1. del: Splošno

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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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 1555-1:2021
01-september-2021
Nadomešča:
SIST EN 1555-1:2010

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

(PE) - 1. del: Splošno

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

General

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 1:

Allgemeines

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

Polyéthylène (PE) - Partie 1 : Généralités
Ta slovenski standard je istoveten z: EN 1555-1:2021
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 1555-1:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 1555-1:2021
---------------------- Page: 2 ----------------------
SIST EN 1555-1:2021
EN 1555-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2021
EUROPÄISCHE NORM
ICS 23.040.01 Supersedes EN 1555-1:2010
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 1: General

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

distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 1: Allgemeines

(PE) - Partie 1 : Généralités
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 1555-1:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1555-1:2021
EN 1555-1:2021 (E)
Contents Page

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

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

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

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

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

3.1 Geometrical definitions ................................................................................................................................ 8

3.2 Material definitions ...................................................................................................................................... 10

3.3 Definitions related to material characteristics .................................................................................. 11

3.4 Definitions related to service conditions ............................................................................................. 11

3.5 Definitions related to joints ...................................................................................................................... 12

4 Symbols and abbreviations ....................................................................................................................... 12

4.1 Symbols............................................................................................................................................................. 12

4.2 Abbreviations ................................................................................................................................................. 13

5 Material ............................................................................................................................................................ 14

5.1 Material of the components ...................................................................................................................... 14

5.2 Compound ........................................................................................................................................................ 14

5.2.1 Additives and pigments .............................................................................................................................. 14

5.2.2 Colour ................................................................................................................................................................ 14

5.2.3 Characteristics ............................................................................................................................................... 14

5.3 Fusion compatibility .................................................................................................................................... 19

5.4 Classification and designation ................................................................................................................. 19

5.5 Design coefficient and design stress ...................................................................................................... 19

Annex A (informative) Additional information related to the installation of PE100-RC systems for

non-conventional installations ................................................................................................................ 20

A.1 Pipe material .................................................................................................................................................. 20

A.2 Installation Conditions................................................................................................................................ 21

Bibliography.................................................................................................................................................................. 23

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SIST EN 1555-1:2021
EN 1555-1:2021 (E)
European foreword

This document (EN 1555-1:2021) has been prepared by Technical Committee CEN/TC 155 “Plastics piping 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 1555-1:2010.

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 now discusses the performance of this type of material and gives additional information for non-

conventional installation techniques.
— The size range has been increased to 800 mm diameter.
— Test methods have been updated.
— New test methods have been added for PE 100-RC materials.

This document has been prepared in liaison with Technical Committee CEN/TC 234 “Gas infrastructure”.

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

(this document);

— 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;

— 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.
---------------------- Page: 5 ----------------------
SIST EN 1555-1:2021
EN 1555-1:2021 (E)

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).

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: 6 ----------------------
SIST EN 1555-1:2021
EN 1555-1:2021 (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 components of the piping system are specified in EN 1555-2:2021,

EN 1555-3:2021 and EN 1555-4:2021.

Characteristics for fitness for purpose are covered in EN 1555-5:2021 [3]. CEN/TS 1555-7 [2] gives guidance

for assessment of conformity. Recommended practices for installation are given in EN 12007-2 [1], prepared

by CEN/TC 234.
This part of EN 1555 covers the general aspects of the plastics piping system.
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SIST EN 1555-1:2021
EN 1555-1:2021 (E)
1 Scope

This document specifies the general aspects of polyethylene (PE) 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 2 to 5 of EN 1555, this document is applicable to PE pipes, fittings, and valves, their

joints and to joints with components of 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, see EN 1555-5 [3].

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.

2 Normative references

The following referenced documents are indispensable for the application 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 1555-2:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 2: Pipes

EN 1555-3:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3: Fittings

EN 1555-4:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 4: Valves

EN 12099, Plastics piping systems - Polyethylene piping materials and components - Determination of volatile

content
EN ISO 472, Plastics - Vocabulary (ISO 472)

EN ISO 1043-1, Plastics - Symbols and abbreviated terms - Part 1: Basic polymers and their special characteristics

(ISO 1043-1)

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 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the

resistance to internal pressure - Part 2: Preparation of pipe test pieces (ISO 1167-2)

EN ISO 1183-1, Plastics - Methods for determining the density of non-cellular plastics - Part 1: Immersion method,

liquid pycnometer method and titration method (ISO 1183-1)
1 5 2
1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
---------------------- Page: 8 ----------------------
SIST EN 1555-1:2021
EN 1555-1:2021 (E)

EN ISO 1183-2, Plastics - Methods for determining the density of non-cellular plastics - Part 2: Density gradient

column method (ISO 1183-2)

EN ISO 6259-1, Thermoplastics pipes - Determination of tensile properties - Part 1: General test method

(ISO 6259-1)

EN ISO 6259-3, Thermoplastics pipes - Determination of tensile properties - Part 3: Polyolefin pipes (ISO 6259-3)

EN ISO 9080, Plastics piping and ducting systems - Determination of the long-term hydrostatic strength of

thermoplastics materials in pipe form by extrapolation (ISO 9080)

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 12162, Thermoplastics materials for pipes and fittings for pressure applications - Classification,

designation and design coefficient (ISO 12162)

EN ISO 13477, Thermoplastics pipes for the conveyance of fluids - Determination of resistance to rapid crack

propagation (RCP) - Small-scale steady-state test (S4 test) (ISO 13477)

EN ISO 13478, Thermoplastics pipes for the conveyance of fluids - Determination of resistance to rapid crack

propagation (RCP) - Full-scale test (FST) (ISO 13478)
EN ISO 15512, Plastics - Determination of water content (ISO 15512)

EN ISO 16871, Plastics piping and ducting systems - Plastics pipes and fittings - Method for exposure to direct

(natural) weathering (ISO 16871)
ISO 3, Preferred numbers - Series of preferred numbers

ISO 6964, Polyolefin pipes and fittings - Determination of carbon black content by calcination and pyrolysis - Test

method

ISO 11413:2019, Plastics pipes and fittings - Preparation of test piece assemblies between a polyethylene (PE) pipe

and an electrofusion fitting

ISO 11414:2009, Plastics pipes and fittings - Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece

assemblies by butt fusion

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 13479:— , Polyolefin pipes for the conveyance of fluids - Determination of resistance to crack propagation -

Test method for slow crack growth on notched pipes

ISO 16770, Plastics - Determination of environmental stress cracking (ESC) of polyethylene - Full-notch creep test

(FNCT)
Under preparation. Stage at the time of publication: ISO/DIS 13479:2021.
---------------------- Page: 9 ----------------------
SIST EN 1555-1:2021
EN 1555-1:2021 (E)

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

relation to slow crack growth - Test method

ISO 18489, Polyethylene (PE) materials for piping systems - Determination of resistance to slow crack growth

under cyclic loading - Cracked Round Bar test method

ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes,

fittings and compounds
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN ISO 472 and EN ISO 1043-1 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 Geometrical definitions
3.1.1
nominal size
DN/OD
numerical designation of the size of a component related to the outside diameter

Note 1 to entry: It is a convenient round number approximately equal to the manufacturing dimension in

millimetres (mm). It is not applicable to components designated by thread size.
3.1.2
nominal outside diameter
specified outside diameter assigned to a nominal size DN/OD
Note 1 to entry: Nominal outside diameter is expressed in millimetres.
3.1.3
outside diameter at any point

value of the measurement of the outside diameter through its cross-section at any point of the pipe, rounded to

the next greater 0,1 mm
3.1.4
mean outside diameter

value of the measurement of the outer circumference of the pipe or spigot end of a fitting in any cross-section

divided by π (= 3,142), rounded to the next greater 0,1 mm
3.1.5
minimum mean outside diameter
em,min

minimum value for the mean outside diameter as specified for a given nominal size

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SIST EN 1555-1:2021
EN 1555-1:2021 (E)
3.1.6
maximum mean outside diameter
em,max

maximum value for the mean outside diameter as specified for a given nominal size

3.1.7
out-of-roundness
ovality

difference between the maximum and the minimum outside diameter in the same cross-section of a pipe or

spigot
3.1.8
nominal wall thickness

numerical designation of the wall thickness of a component, which is a convenient round number,

approximately equal to the manufacturing dimension in millimetres (mm)

Note 1 to entry: For thermoplastics components conforming to the different parts of EN 1555, the value of the nominal

wall thickness, e , is identical to the specified minimum wall thickness at any point, e .

n min
3.1.9
wall thickness at any point

wall thickness at any point around the circumference of a component rounded to the next greater 0,1 mm

Note 1 to entry: The symbol for the wall thickness of the fittings and valves body at any point is E.

3.1.10
minimum wall thickness at any point
min

minimum value for the wall thickness at any point around the circumference of a component, as specified

3.1.11
maximum wall thickness at any point
max

maximum value for the wall thickness at any point around the circumference of a component, as specified

3.1.12
mean wall thickness

arithmetical mean of a number of measurements of the wall thickness, regularly spaced around the

circumference and in the same cross-section of a component, including the measured minimum and the

measured maximum values of the wall thickness in that cross-section
3.1.13
tolerance

permitted variation of the specified value of a quantity, expressed as the difference between the permitted

maximum and the permitted minimum value
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SIST EN 1555-1:2021
EN 1555-1:2021 (E)
3.1.14
wall thickness tolerance

permitted difference between the wall thickness at any point, e, and the nominal wall thickness, e

Note 1 to entry:
e ≤≤ee +t
n ny
3.1.15
standard dimension ratio
SDR

numerical designation of a pipe series, which is a convenient round number, approximately equal to the

dimension ratio of the nominal outside diameter, d , and the nominal wall thickness, e

n n
3.1.16
pipe series
number for pipe designation, conforming to ISO 4065 [6]

Note 1 to entry: The relationship between the pipe series S and the standard dimension ratio SDR is given by the following

equation as specified in ISO 4065 [6].
SDR− 1
3.2 Material definitions
3.2.1
compound

homogenous extruded mixture of base polymer (PE) and additives, i.e. anti-oxidants, pigments, carbon black,

UV-stabilizers and others, at a dosage level necessary for the processing and use of components conforming to

the requirements of this document
3.2.2
virgin material

compound in a form such as granules that has not been subjected to use or processing other than that required

for its manufacture, and to which no reworked or recyclable materials have been added

3.2.3
reworked material

plastics materials from rejected unused products or trimmings that have been manufactured and retained

within plants owned and operated by the same legal entity

Note 1 to entry: Restrictions for use of reworked material for pipes are defined in EN 1555-2, fittings in EN 1555-3 and

for valves in EN 1555-4.
3.2.4
base polymer

polymer produced by the material supplier for the manufacture of the compound according to this document

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SIST EN 1555-1:2021
EN 1555-1:2021 (E)
3.3 Definitions related to material characteristics
3.3.1
lower confidence limit of the predicted hydrostatic strength
LPL

quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the predicted

hydrostatic strength at a temperature θ and time t
Note 1 to entry: It is expressed in megapascals (MPa).
3.3.2
minimum required strength
MRS

value of σ at 20 °C and 50 years, rounded down to the next lower value of the R10 series when σ is less

LPL LPL

than 20 MPa, or down to the next lower value of the R20 series when σ is greater than or equal to 20 MPa

LPL

Note 1 to entry: Only compounds with a MRS of 8 or 10 are specified in this document.

Note 2 to entry: The R10 series conforms to ISO 3 and the R20 series conforms to ISO 497 [4].

Note 3 to entry: The minimum required strength is expressed in megapascals.
3.3.3
design coefficient

coefficient with a value greater than 1, which takes into consideration service conditions as well as properties

of the components of a piping system other than those represented in the lower confidence limit

3.3.4
design stress

allowable stress for a given application at 20 °C, that is derived from the MRS by dividing it by the coefficient C,

i.e.:
MRS
σ =
Note 1 to entry: It is expressed in Megapascals (MPa).
3.3.5
Melt mass-flow rate
MFR

value relating to the viscosity of the molten material at a specified temperature and load

Note 1 to entry: It is expressed in grams per 10 min (g/10 min).
3.4 Definitions related to service conditions
3.4.1
gaseous fuel

fuel which is in gaseous state at a temperature of 15 °C, at atmospheric pressure

Note 1 to entry: There are proposals to inject gases from renewable sources in the natural gas network, e.g. hydrogen

(H ). This is the subject of ongoing research.
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SIST EN 1555-1:2021
EN 1555-1:2021 (E)
3.4.2
maximum operating pressure
MOP

maximum effective pressure of the fluid in the piping system, expressed in bar, which is allowed in continuous

use

Note 1 to entry: It is expressed in bar and takes into account the physical and the mechanical characteristics of the

components of a piping system and it is calculated using the following equation:
20× MRS
MOP=
C×−()SDR 1

Note 2 to entry: Research on long-term performance prediction of PE water and gas distribution systems shows a possible

service life of at least 100 years, see Bibliography [11], [12] and [13].
3.4.3
reference temperature
temperature for which the piping system is designed

Note 1 to entry: It is used as the base for further calculation when designing a piping system or parts of a piping system

for operating temperatures different from the reference temperature.
3.5 Definitions related to joints
3.5.1
butt fusion joint using heated tool

joint made by heating the planed ends of pipes or spigot end fittings, the surfaces of which mate by holding

them against a flat heating plate until the PE material reaches fusion temperature, removing the heating plate

quickly and pushing the two softened ends against one another
3.5.2
fusion compatibility

ability of two similar or dissimilar polyethylene compounds to be fused together to form a joint which conforms

to the performance requirements of this document
3.5.3
electrofusion joint

joint between a PE socket or saddle electrofusion fitting and pipe or fitting with spigot ends, made by heating

the electrofusion fittings by the Joule effect of the heating element incorporated at their jointing surfaces,

causing the material adjacent to them to melt and the pipe and fitting surfaces to fuse

3.5.4
mechanical joint

joint made by assembling a PE pipe to another PE pipe, or any other element using a fitting that generally

includes a compression part, to provide for pressure integrity, leaktightness and resistance to end loads

4 Symbols and abbreviations
4.1 Symbols
For the purposes of this document, the following symbols apply.
---------------------- Page: 14 ----------------------
SIST EN 1555-1:2021
EN 1555-1:2021 (E)
C design coefficient
d outside diameter (at any point)
d mean outside diameter
d maximum mean outside diameter
em,max
d minimum mean outside diameter
em,min
d nominal outside diameter
wall thickness (at any point) of a pipe
E wall thickness (at any point) of a fitting and valve body
e mean wall thickness
e maximum wall thickness (at any point)
max
e minimum wall thickness (at any point)
min
e nominal wall thickness
strain hardening modulus

t wall thickness tolerance
σ design stress
σ lower confidence limit of the predicted hydrostatic strength
LPL

NOTE Symbols d , e, e and e in this document are equivalent to d , e , e and e , respectively, used

e min max ey y y,min y,max
in ISO 11922-1 [7].
4.2 Abbreviations
AFNCT accelerated full notch creep test
ANPT accelerated notched pipe test
CRB cracked round bar
DN/OD nominal size, outside diameter related
FNCT full notch creep test
LPL lower predicted limit
MFR melt mass-flow rate
MOP maximum operating pressure
MRS minimum required strength
NPT notched pipe test
OIT oxidation induction time
PE polyethylene
R renard series of preferred numbers
RC raised crack resistance
RCP rapid crack propagation
S number for pipe designation
standard dimension ratio
SDR
strain hardening test
SHT
---------------------- Page: 15 ----------------------
SIST EN 1555-1:2021
EN 1555-1:2021 (E)
5 Material
5.1 Material of the components

The pipes, fittings and valves shall be made of polyethylene compound conforming to this document.

This document includes materials classified PE 80 and PE 100.

In addition another type of PE 100 designated PE 100-RC with enhanced resistance to slow crack growth is

included in this document, see Annex A for additional information.

The material described in this document is a compound which shall be supplied in the form of granules, suitable

for the production of pipes complying with EN 1555-2, fittings complying with EN 1555-3, or valves complying

with EN 1555-4.
5.2 Compound
5.2.1 Additives and pigments

The compound shall be made by the material producer by adding to the polyethylene base polymer only those

additives, pigments (e.g. carbon black) necessary for the manufacture of pipes, fittings and valves conforming

to EN 1555-2:2021, EN 1555-3:2021 or EN 1555-4:2021, as applicable, and for their fusibility, storage and use.

The carbon black used in the production of black compound shall have an average (primary) particle size of

10 nm to 25 nm.
All additives and pigments shall be uniformly dispersed.
5.2.2 Colour

The colour of the compound shall be yellow (PE 80), orange (PE 100 and PE 100-RC), or black (PE

...

SLOVENSKI STANDARD
oSIST prEN 1555-1:2019
01-december-2019

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

(PE) - 1. del: Splošno

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

General

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 1:

Allgemeines

Systèmes de canalisations en plastique pour la distribution de combus-tibles gazeux -

Polyéthylène (PE) - Partie 1 : Généralités
Ta slovenski standard je istoveten z: prEN 1555-1
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 1555-1:2019 en,fr,de

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

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oSIST prEN 1555-1:2019
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oSIST prEN 1555-1:2019
DRAFT
EUROPEAN STANDARD
prEN 1555-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2019
ICS 23.040.01 Will supersede EN 1555-1:2010
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 1: General

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

distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 1: Allgemeines

(PE) - Partie 1 : Généralités

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 1555-1:2019 E

worldwide for CEN national Members.
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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
Contents Page

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

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

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

3 Terms and definitions, symbols and abbreviations ........................................................................... 6

4 Material ............................................................................................................................................................ 12

4.1 Material of the components ...................................................................................................................... 12

4.2 Compound ........................................................................................................................................................ 12

4.2.1 Additives and pigments .............................................................................................................................. 12

4.2.2 Colour ................................................................................................................................................................ 12

4.2.3 Characteristics ............................................................................................................................................... 12

Table 1 — Characteristics of the compound in the form of granules ....................................................... 13

Table 2 — Characteristics of compound in the form of pipe ....................................................................... 15

4.3 Fusion compatibility .................................................................................................................................... 16

4.4 Classification and designation ................................................................................................................. 17

Table 4 — Classification and designation of compounds ............................................................................. 17

4.5 Design coefficient and design stress ...................................................................................................... 17

Annex A (informative) Additional information related to the installation of PE100-RC systems for

non-conventional installations ................................................................................................................ 18

A.1 Pipe material .................................................................................................................................................. 18

Table A.1 — Resistance to slow crack growth for PE 100 and PE 100-RC .............................................. 18

A.2 Installation Conditions................................................................................................................................ 19

The usual conventional installation method for PE 80 and PE 100 piping systems is often open

trench installation with sand bedding around the pipe. ................................................................ 19

Other non-conventional installation techniques using specialized machinery and trenchless ‘No-

Dig’ techniques can increase the risk of scratches and damage to the pipe in more undefined

conditions. Using the PE100-RC material with the lower notch sensitivity and reduced rates

of crack growth increases the safety, reliability and lifetime of the pipe system, and

therefore is used especially for: .............................................................................................................. 19

Bibliography.................................................................................................................................................................. 21

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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
European foreword

This document (prEN 1555-1:2019) has been prepared by Technical Committee CEN/TC 155 “Plastics piping

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 1555-1:2010.

It has been prepared in liaison with Technical Committee CEN/TC 234 “Gas infrastructure”.

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 (this

document);

— 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;

— 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 [3] 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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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (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 components of the piping system are specified in prEN 1555-2:2019,

prEN 1555-3:2019 and prEN 1555-4:2019.

Characteristics for fitness for purpose are covered in prEN 1555-5:2019 [1]. CEN/TS 1555-7:2019 [2] gives

guidance for assessment of conformity. Recommended practices for installation re given in EN 12007-2:2012

[3], prepared by CEN/TC 234.
This part of EN 1555 covers the general aspects of the plastics piping system.
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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
1 Scope

This document specifies the general aspects of polyethylene (PE) 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 2 to 5 of EN 1555, this document is applicable to PE pipes, fittings, and valves, their

joints and to joints with components of 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 can be used, see prEN 1555-5:2019 [1].

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.

2 Normative references

The following referenced documents are indispensable for the application 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.

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

prEN 1555-3:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings

prEN 1555-4:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves

EN ISO 472, Plastics — Vocabulary (ISO 472)

EN ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special

characteristics (ISO 1043-1)

EN ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and the 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 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the

resistance to internal pressure — Part 2: Preparation of pipe test pieces (ISO 1167-2)

EN ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion

method, liquid pyknometer method and titration method (ISO 1183-1)

EN ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient

column method (ISO 1183-2)
1 bar = 0,1 MPa.
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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)

EN ISO 6259-1, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method

(ISO 6259-1)

EN ISO 6259-3, Thermoplastics pipes — Determination of tensile properties — Part 3: Polyolefin pipes

(ISO 6259-3)

EN ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of

thermoplastics materials in pipe form by extrapolation (ISO 9080)

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 12162, Thermoplastics materials for pipes and fittings for pressure applications — Classification,

designation and design coefficient (ISO 12162)

EN ISO 13477, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack

propagation (RCP) — Small-scale steady-state test (S4 test) (ISO 13477)

EN ISO 13478, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack

propagation (RCP) — Full-scale test (FST) (ISO 13478)

EN ISO 13479, Polyolefin pipes for the conveyance of fluids — Determination of resistance to crack propagation

— Test method for slow crack growth on notched pipes (ISO 13479)
EN ISO 15512, Plastics — Determination of water content (ISO 15512)

EN ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to direct

(natural) weathering (ISO 16871)

ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and pyrolysis —

Test method

ISO 11413:2018, Plastics pipes and fittings — Preparation of test piece assemblies between a polyethylene (PE)

pipe and an electrofusion fitting

ISO 11414:2009, Plastics pipes and fittings — Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece

assemblies by butt fusion

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 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes,

fittings and compounds
3 Terms and definitions, symbols and abbreviations

For the purposes of this document, the terms and definitions given in EN ISO 472 and EN ISO 1043-1 and the

following apply.
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
3.1 Terms and definitions
3.1.1 Geometrical definitions
3.1.1.1
nominal size
DN/OD

numerical designation of by thread the size of a component related to the outside diameter

Note 1 to entry: It is a convenient round number approximately equal to the manufacturing dimension in

millimetres (mm). It is not applicable to component designated size.
3.1.1.2
nominal outside diameter
specified outside diameter assigned to a nominal size DN/OD
Note 1 to entry: Nominal outside diameter is expressed in millimetres.
3.1.1.3
outside diameter at any point

value of the measurement of the outside diameter through its cross-section at any point of the pipe, rounded to

the next greater 0,1 mm
3.1.1.4
mean outside diameter

value of the measurement of the outer circumference of the pipe or spigot end of a fitting in any cross-section

divided by π (= 3,142), rounded to the next greater 0,1 mm
3.1.1.5
minimum mean outside diameter
em,min

minimum value for the mean outside diameter as specified for a given nominal size

3.1.1.6
maximum mean outside diameter
em,max

maximum value for the mean outside diameter as specified for a given nominal size

3.1.1.7
out-of-roundness
ovality

difference between the maximum and the minimum outside diameter in the same cross-section of a pipe or

spigot
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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
3.1.1.8
nominal wall thickness

numerical designation of the wall thickness of a component, which is a convenient round number,

approximately equal to the manufacturing dimension in millimetres (mm)

Note 1 to entry: For thermoplastics components conforming to the different parts of EN 1555, the value of the nominal

wall thickness, e , is identical to the specified minimum wall thickness at any point, e .

n min
3.1.1.9
wall thickness at any point

wall thickness at any point around the circumference of a component rounded to the next greater 0,1 mm

Note 1 to entry: The symbol for the wall thickness of the fittings and valves body at any point is E.

3.1.1.10
minimum wall thickness at any point
min

minimum value for the wall thickness at any point around the circumference of a component, as specified

3.1.1.11
maximum wall thickness at any point
max

maximum value for the wall thickness at any point around the circumference of a component, as specified

3.1.1.12
mean wall thickness

arithmetical mean of a number of measurements of the wall thickness, regularly spaced around the

circumference and in the same cross-section of a component, including the measured minimum and the

measured maximum values of the wall thickness in that cross-section
3.1.1.13
tolerance

permitted variation of the specified value of a quantity, expressed as the difference between the permitted

maximum and the permitted minimum value
3.1.1.14
wall thickness tolerance

permitted difference between the wall thickness at any point, e, and the nominal wall thickness, e

Note 1 to entry: e ≤≤ee +t
n ny
3.1.1.15
standard dimension ratio
SDR

numerical designation of a pipe series, which is a convenient round number, approximately equal to the

dimension ratio of the nominal outside diameter, d , and the nominal wall thickness, e

n n
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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
3.1.1.16
pipe series
number for pipe designation, conforming to ISO 4065 [10]

Note 1 to entry: The relationship between the pipe series S and the standard dimension ratio SDR is given by the following

equation as specified in ISO 4065 [10].
SDR− 1
3.1.2 Material definitions
3.1.2.1
virgin material

compound in a form such as granules that has not been subjected to use or processing other than that required

for its manufacture and to which no reprocessed or recyclable materials have been added

3.1.2.2
own reprocessed material

material prepared from clean rejected unused pipes, fittings or valves, including trimmings from the production

of pipes, fittings or valves, that will be reprocessed in a manufacturer's plant after having been previously

processed by the same manufacturer in the production of components by, for example, injection-moulding or

extrusion
3.1.2.3
compound

homogenous extruded mixture of base polymer (PE) and additives, i.e. anti-oxidants, pigments, carbon black,

UV-stabilizers and others, at a dosage level necessary for the processing and use of components conforming to

the requirements of this document
3.1.3 Definitions related to material characteristics
3.1.3.1
lower confidence limit of the predicted hydrostatic strength
σLPL

quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the predicted

hydrostatic strength at a temperature θ and time t
Note 1 to entry: It is expressed in megapascals.
3.1.3.2
minimum required strength
MRS

value of σLPL at 20 °C and 50 years, rounded down to the next smaller value of the R10 series when σLPL is

below 10 MPa, or to the next lower value of the R20 series when σLPL is 10 MPa or greater

Note 1 to entry: The R10 series conforms to ISO 3 [8] and the R20 series conforms to ISO 497 [9].

3.1.3.3
design coefficient

coefficient with a value greater than 1, which takes into consideration service conditions as well as properties

of the components of a piping system other than those represented in the lower confidence limit

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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
3.1.3.4
design stress

allowable stress for a given application at 20 °C, that is derived from the MRS by dividing it by the coefficient C,

i.e.:
MRS
σ =
Note 1 to entry: It is expressed in Megapascals.
3.1.3.5
Melt mass-flow rate
MFR

value relating to the viscosity of the molten material at a specified temperature and load

Note 1 to entry: It is expressed in grams per 10 min (g/10 min).
3.1.4 Definitions related to service conditions
3.1.4.1
gaseous fuel

fuel which is in gaseous state at a temperature of 15 °C, at the atmospheric pressure

3.1.4.2
maximum operating pressure
MOP

maximum effective pressure of the fluid in the piping system, expressed in bar, which is allowed in continuous

use

Note 1 to entry: It is expressed in bar and takes into account the physical and the mechanical characteristics of the

components of a piping system and it is calculated using the following equation:
20× MRS
MOP=
C×−()SDR 1

Note 2 to entry: Research on long-term performance prediction of PE water and gas distribution systems shows a possible

service life of at least 100 years, see Bibliography [13], [14] and [15].
3.1.4.3
reference temperature
temperature for which the piping system is designed

Note 1 to entry: It is used as the base for further calculation when designing a piping system or parts of a piping system

for operating temperatures different from the reference temperature.
3.1.5 Definitions related to joints
3.1.5.1
butt fusion joint using heated tool

joint made by heating the planed ends of pipes or spigot end fittings, the surfaces of which match by holding

them against a flat heating plate until the PE material reaches fusion temperature, removing the heating plate

quickly and pushing the two softened ends against one another
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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
3.1.5.2
fusion compatibility

ability of two similar or dissimilar polyethylene compounds to be fused together to form a joint which conforms

to the performance requirements of this document
3.1.5.3
electrofusion joint

joint between a PE socket or saddle electrofusion fitting and pipe or fitting with spigot ends, made by heating

the electrofusion fittings by the Joule effect of the heating element incorporated at their jointing surfaces,

causing the material adjacent to them to melt and the pipe and fitting surfaces to fuse

3.1.5.4
mechanical joint

joint made by assembling a PE pipe to another PE pipe, or any other element using a fitting that generally

includes a compression part, to provide for pressure integrity, leaktightness and resistance to end loads

3.2 Symbols
For the purposes of this document, the following symbols apply.
C design coefficient
de outside diameter (at any point)
dem mean outside diameter
dem,max maximum mean outside diameter
dem,min minimum mean outside diameter
d nominal outside diameter
E wall thickness (at any point) of a fitting and valve body
em mean wall thickness
emax maximum wall thickness (at any point)
emin minimum wall thickness (at any point)
en nominal wall thickness
ty wall thickness tolerance
σs design stress
σ lower confidence limit of the predicted hydrostatic strength
LPL

NOTE Symbols d , e, e and e in this document are equivalent to d , e , e and e , respectively,

e min max ey y y,min y,max
used in EN ISO 11922-1 [12].
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oSIST prEN 1555-1:2019
prEN 1555-1:2019 (E)
3.3 Abbreviations
AFNCT accelerated full notch creep test
ANPT accelerated notched pipe test
CRB cracked round bar
DN/OD nominal size, outside diameter related
FNCT full notch creep test
LPL lower predicted limit
MFR melt mass-flow rate
MOP maximum operating pressure
MRS minimum required strength
PE polyethylene
RC raised crack resistance
SDR standard dimension ratio
SHT strain hardening test
4 Material
4.1 Material of the components

The pipes, fittings and valves shall be made of polyethylene compound conforming to this document.

The material described in this document is a compound which shall be supplied in the form of granules, suitable

for the production of pipes complying with EN 1555-2, fittings complying with EN 1555-3, or valves complying

with EN 1555-4.
4.2 Compound
4.2.1 Additives and pigments

The compound shall be made by the material producer by adding to the polyethylene base polymer only those

additives, pigments (e.g. carbon black) necessary for the manufacture of pipes, fittings and valves conforming

to prEN 1555-2:2019, prEN 1555-3:2019 or prEN 1555-4:2019, as applicable, and for their fuseability, storage

and use.

The carbon black used in the production of black compound shall have an average (primary) particle size of

10 nm to 25 nm.
All additives and pigments shall be uniformly dispersed.
4.2.2 Colour

The colour of the compound shall be yellow (PE 80), orange (PE 100 and PE 100-RC), or black (PE 80, PE 100

and PE 100-RC).
4.2.3 Characteristics
4.2.3.1 Characteristics of the compound in the form of granules

The compound in the form of granules used for the manufacture of pipes, fittings and valves shall have

characteristics conforming to the requirements given in Table 1.
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Table 1 — Characteristics of the compound in the form of granules
Characteristic Test parameters Test method
Requirements
Parameter Value
Compound density
Test temperature 23 °C EN ISO 1183-1
≥ 930 kg/m
Shall conform or
Number of samples
to EN ISO 1183-2
EN ISO 1183-1
or EN ISO
1183-2
Oxidation induction ≥ 20 min Test temperature EN ISO 11357-
210 °C
time (Thermal 6
Number of test pieces 3
stability)
Test atmosphere Oxygen
Melt mass-flow rate (0,20 ≤ MFR ≤ 1,4) Loading mass 5 kg EN ISO 1133-1
(MFR) g/10 min Test temperature 190 °C
Time 10 min
Maximum deviation
Shall conform
of ± 20 % of the Number of test pieces
d i to
nominated value
EN ISO 1133-1
e b
≤ 300 mg/kg 1 EN ISO 15512
Water content Number of test pieces
(Equivalent
to ≤ 0,03 % by
mass)
Carbon black content (2,0 to 2,5) % (by Shall conform to ISO 6964 ISO 6964
mass)
Carbon black Grade ≤ 3 Preparation of test ISO 18553
Free
pieces
dispersion Shall conform
Rating of
Number of test pieces to
appearance A1, A2,
ISO 18553
A3 or B
h g
Grade < 3 Preparation of test ISO 18553
Pigment dispersion Free
pieces
Shall conform
Rating of
Number of test pieces to
appearance A1, A2,
ISO 18553
A3 or B
Resistance to slow < GP > = ≥ 53 MPa Test temperature 80 °C ISO 18488
crack growth – PE Thickness 300 µm
100-RC Test speed Shall conform
to ISO 18488
Strain – Hardening Number of test pieces
test (Compression
moulded sheet in
accordance with
ISO 8488)
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prEN 1555-1:2019 (E)
Resistance to slow Test temperature 23 °C ISO 18489
≥ 1,5 × 10 cycles
crack growth – PE Type of test In air
100-RC Diameter of test piece 14 mm
Stress level 12,5 MPa
Cracked Round Bar
Waveform/frequency Sinusoid/10 H
test (Compression
Number of test pieces z Shall
moulded sheet in
conform to
accordance with
ISO 18489
ISO 18489)
Resistance to slow No failure during Test temperature 90 °C ISO 16770
crack growth – PE test period Environment Lauramine
100RC Concentration oxide
Test piece dimension 2 %
Accelerated FNCT
Stress level/Test 10 mm square
test
period 4 MPa / 800 h
(Compression
Number of test pieces
moulded sheet in
Shall conform
accordance with
to ISO 16770
ISO 16770)
Conformity to these requirements shall be proved by the compound producer.

The numbers of test pieces given indicate the numbers required to establish a value for the characteristic

described in the table. The numbers of test pieces required for factory production control and process control

should be listed in the manufacturer’s quality plan. For guidance, see CEN/TS 1555-7 [2].

Test may be car
...

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