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

This part of EN 1555 specifies the characteristics of pipes made from polyethylene (PE) 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 and 3 to 5 of EN 1555, it is applicable to PE pipes, 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 1);
b)   an operating temperature of 20 °C as reference temperature.
NOTE 1   For other operating temperatures, derating coefficients should be used, see FprEN 1555-5.
EN 1555 covers a range of maximum operating pressures and gives requirements concerning colours and additives.
It covers three types of pipe:
-   PE pipes (outside diameter dn) including any identification stripes;
-   PE pipes with co-extruded layers on either or both the outside and/or inside of the pipe (total outside diameter dn) as specified in Annex A, where all layers have the same MRS rating;
-   PE pipes (outside diameter dn) with a peelable, contiguous thermoplastics additional layer on the outside of the pipe (‘coated pipe’) as specified in Annex B.
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 2: Rohre

Dieses Dokument legt die Eigenschaften von Rohren aus Polyethylen (PE) für Rohrleitungssysteme 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 Teil 1 und Teil 3 bis Teil 5 von EN 1555 gilt es für Rohre 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 ;
b)   es gilt eine Betriebstemperatur von 20 °C als Bezugstemperatur.
ANMERKUNG 1   Für andere Betriebstemperaturen können Minderungsfaktoren verwendet werden, siehe prEN 1555 5:2019.
EN 1555 deckt einen Bereich von maximal zulässigen Betriebsdrücken ab und legt Anforderungen bezüglich Farben und Zusatzstoffen fest.
Drei Arten von Rohren werden behandelt:
-   PE Rohre (Außendurchmesser dn) einschließlich sämtlicher Identifizierungsstreifen;
-   PE Rohre mit koextrudierten Schichten auf der Außen  und/oder der Innenfläche des Rohres (Gesamt Außendurchmesser dn), wie in Anhang A festgelegt, wobei alle Schichten den gleichen MRS Wert aufweisen;
Ein koextrudiertes Rohr, das aus einer Kombination von PE 100  und PE 100 RC Schichten besteht, ist als PE 100 Rohr zu betrachten und muss entsprechend gekennzeichnet werden.
-   PE Rohre (Außendurchmesser dn) mit einer schälbaren zusätzlichen thermoplastischem Schicht, anliegend auf der Außenfläche des Rohres („beschichtetes Rohr“), wie in Anhang B festgelegt.
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 2 : Tubes

Le présent document spécifie les caractéristiques des tubes en polyéthylène (PE) pour les systèmes de canalisations destinés 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 et 3 à 5 de l’EN 1555, il s’applique aux tubes 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 1 ;
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.
L’EN 1555 concerne une gamme de pressions maximales de service et donne les exigences concernant la couleur et les additifs.
Elle couvre par ailleurs trois types de tubes :
-   les tubes en PE (diamètre extérieur dn) y compris les bandes d’identification éventuelles ;
-   les tubes en PE comportant des couches coextrudées soit sur leur surface externe et/ou interne, soit sur leurs deux surfaces (diamètre extérieur total dn) tel que spécifié dans l’Annexe A, où toutes les couches ont la même classification MRS ;
Un tube coextrudé constitué d’une combinaison de couches de PE 100 et de PE 100-RC doit être considéré comme du PE 100 et marqué en conséquence.
-   les tubes en PE (diamètre extérieur dn) comportant une couche supplémentaire thermoplastique contiguë pelable sur leur surface externe (« tube revêtu »), tel que spécifié dans l’Annexe B.
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) - 2. del: Cevi

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 1555-2:2021
01-september-2021
Nadomešča:
SIST EN 1555-2:2010

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

(PE) - 2. del: Cevi

Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 2:

Pipes

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 2: Rohre

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

Polyéthylène (PE) - Partie 2 : Tubes
Ta slovenski standard je istoveten z: EN 1555-2:2021
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 1555-2:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 1555-2:2021
---------------------- Page: 2 ----------------------
SIST EN 1555-2:2021
EN 1555-2
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2021
EUROPÄISCHE NORM
ICS 23.040.20 Supersedes EN 1555-2:2010
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 2: Pipes

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

distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 2: Rohre

(PE) - Partie 2 : Tubes
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 1555-2:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1555-2:2021
EN 1555-2:2021 (E)
Contents Page

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

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

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

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

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

4 Symbols and abbreviations ......................................................................................................................... 8

5 Material .............................................................................................................................................................. 8

5.1 Compound for pipes ....................................................................................................................................... 8

5.2 Compound for identification stripes ........................................................................................................ 8

5.3 External reworked and recycled material ............................................................................................. 8

6 General characteristics ................................................................................................................................. 9

6.1 Appearance ....................................................................................................................................................... 9

6.2 Colour .................................................................................................................................................................. 9

7 Geometrical characteristics ........................................................................................................................ 9

7.1 Measurement of dimensions....................................................................................................................... 9

7.2 Mean outside diameters, out-of-roundness (ovality) and tolerances ......................................... 9

7.3 Wall thicknesses and related tolerances .............................................................................................. 11

7.3.1 Minimum wall thicknesses ........................................................................................................................ 11

7.3.2 Tolerance on the wall thicknesses .......................................................................................................... 12

7.4 Circumferential reversion of pipes with a dn equal to or greater than 250 mm ................... 14

7.5 Coiled pipe ....................................................................................................................................................... 14

7.6 Lengths .............................................................................................................................................................. 14

8 Mechanical characteristics ........................................................................................................................ 14

8.1 Conditioning ................................................................................................................................................... 14

8.2 Requirements ................................................................................................................................................. 14

9 Physical characteristics .............................................................................................................................. 18

9.1 Conditioning ................................................................................................................................................... 18

9.2 Requirements ................................................................................................................................................. 18

10 Performance requirements ....................................................................................................................... 19

11 Marking ............................................................................................................................................................ 19

11.1 General .............................................................................................................................................................. 19

11.2 Minimum required marking ..................................................................................................................... 20

11.3 Additional marking ...................................................................................................................................... 20

Annex A (normative) Pipes with co-extruded layers ...................................................................................... 21

Annex B (normative) Pipes with peelable layer ............................................................................................... 23

Annex C (normative) Squeeze-off technique ...................................................................................................... 25

Bibliography.................................................................................................................................................................. 26

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SIST EN 1555-2:2021
EN 1555-2:2021 (E)
European foreword

This document (EN 1555-2:2021) 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 1555-2:2010.

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

additional information for non-conventional installation techniques.
— Test methods have been updated.
— New test methods have been added for PE 100-RC materials.

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;

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

(this standard);

— 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 [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).
---------------------- Page: 5 ----------------------
SIST EN 1555-2:2021
EN 1555-2:2021 (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.
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SIST EN 1555-2:2021
EN 1555-2:2021 (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 pipes, are specified in

EN 1555-1, EN 1555-3 [2] and EN 1555-4 [3].

Characteristics for fitness for purpose are covered in EN 1555-5. CEN/TS 1555-7 [4] 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 pipes.
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SIST EN 1555-2:2021
EN 1555-2:2021 (E)
1 Scope

This document specifies the characteristics of pipes made from polyethylene (PE) 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 and 3 to 5 of EN 1555, it is applicable to PE pipes, 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 covers a range of maximum operating pressures and gives requirements concerning colours.

It covers three types of pipe:
— PE pipes (outside diameter d ) including any identification stripes;

— PE pipes with co-extruded layers on either or both the outside and/or inside of the pipe (total outside

diameter d ) as specified in Annex A, where all layers have the same MRS rating. A coextruded pipe

made of a combination of PE 100 and PE 100-RC layers shall be regarded as PE 100 and marked

accordingly;

— PE pipes (outside diameter d ) with a peelable, contiguous thermoplastics additional layer on the

outside of the pipe (‘coated pipe’) as specified in Annex B.

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

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

for purpose of the system

EN 12106, Plastics piping systems - Polyethylene (PE) pipes - Test method for the resistance to internal

pressure after application of squeeze-off

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)
1 5 2
bar = 0,1 MPa. = 10 Pa; 1 MPa = 1 N/mm .
---------------------- Page: 8 ----------------------
SIST EN 1555-2:2021
EN 1555-2:2021 (E)

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 2505, Thermoplastics pipes - Longitudinal reversion - Test method and parameters (ISO 2505)

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

ISO 4065, Thermoplastics pipes - Universal wall thickness table

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

(ISO 6259-1)

EN ISO 6259-3:2015, Thermoplastics pipes - Determination of tensile properties - Part 3: Polyolefin pipes

(ISO 6259-3:2015)
EN ISO 9969, Thermoplastics pipes - Determination of ring stiffness (ISO 9969)

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 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 13968, Plastics piping and ducting systems - Thermoplastics pipes - Determination of ring flexibility

(ISO 13968)

ISO 11922-1:2018, Thermoplastics pipes for the conveyance of fluids - Dimensions and tolerances - Part 1:

Metric series

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 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
Under preparation. Stage at the time of publication: ISO/DIS 13479:2021.
---------------------- Page: 9 ----------------------
SIST EN 1555-2:2021
EN 1555-2:2021 (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
squeeze-off

gas flow stopped by squeezing the pipe when compressed between two clamps in such a way that the

distance between both clamps is less than twice the nominal wall thickness
Note 1 to entry: See Annex C.
4 Symbols and abbreviations

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

5 Material
5.1 Compound for pipes
The PE compound from which the pipes are made shall conform to EN 1555-1.

The pipes shall be made from virgin material or reworked material from the same PE compound from the

manufacturer’s own plant, or a mixture of both. Reworked material from the base pipe of peelable layer

pipe (coated pipe) and reworked material from pipes with identification stripes may be used.

For co-extruded layers, see Annex A.

Reworked material from coextruded pipes or from pipes reworked with the peelable layer attached shall

not be used.
5.2 Compound for identification stripes

The stripe compound (see 6.2) shall be manufactured from a PE base polymer according to EN 1555-1,

which is used for a pipe compound for which fusion compatibility has been proven.

The compound used for identification stripes shall comply with the fusion compatibility requirements in

EN 1555-1, and with the resistance to weathering as described in EN 1555-1:2021, Table 2. The

resistance to weathering of the identification stripe compound shall be declared by the manufacturer of

2 2

the compound, confirming whether either a cumulative radiant exposure of ≥ 3,5 GJ/ m or ≥ 7 GJ/m

related to the outdoor storage ability limit is applicable.

The OIT of the stripe compound shall be ≥ 20 min at 200 °C, measured by the compound supplier in

accordance with EN ISO 11357-6.
5.3 External reworked and recycled material

Reworked material obtained from external sources, and recycled material shall not be used.

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SIST EN 1555-2:2021
EN 1555-2:2021 (E)
6 General characteristics
6.1 Appearance

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

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

conformity to this document.
The ends of the pipe shall be cut cleanly and square to the axis of the pipe.
6.2 Colour

Pipes shall be black (PE 80, PE 100 and PE 100-RC), yellow (PE 80) or orange (PE 100 and PE 100-RC).

In addition, black PE 80 pipes may be identified by yellow stripes and black PE 100 and PE 100-RC pipes

may be identified by yellow or orange stripes, according to national preference.

The outer coextruded layer of coextruded pipes (see Annex A) or the outer peelable layer of peelable

layer pipes (see Annex B) shall be either black, yellow or orange. In addition, identification stripes may

be used according to national preference.
NOTE National preference for colour can be stated in the national foreword.
7 Geometrical characteristics
7.1 Measurement of dimensions

The dimensions of the pipe shall be measured in accordance with EN ISO 3126, and rounded to the next

0,1 mm. In case of dispute, the measurement shall not be made less than 24 h after manufacture after

being conditioned for at least 4 h at (23 ± 2) °C.

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

shown of correlation.
7.2 Mean outside diameters, out-of-roundness (ovality) and tolerances
The mean outside diameters of the pipe, d shall conform to Table 1.
For straight pipes, the maximum out-of-roundness shall conform to Table 1.

NOTE Care is taken that packaging and storage does not lead to an increased out of roundness and flattening

of the pipe. Additional information is given in EN 12007-2:2012, Annex A.
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SIST EN 1555-2:2021
EN 1555-2:2021 (E)
Table 1 — Mean outside diameters and out-of-roundness
Dimensions in millimetres
Nominal
Maximum out-of-
Nominal
outside Mean outside diameter
roundness for
size
diameter
b c
DN/OD straight pipes
d d
n em,min
em,max
16 16 16,0 16,3 1,2
20 20 20,0 20,3 1,2
25 25 25,0 25,3 1,2
32 32 32,0 32,3 1,3
40 40 40,0 40,4 1,4
50 50 50,0 50,4 1,4
63 63 63,0 63,4 1,5
75 75 75,0 75,5 1,6
90 90 90,0 90,6 1,8
110 110 110,0 110,7 2,2
125 125 125,0 125,8 2,5
140 140 140,0 140,9 2,8
160 160 160,0 161,0 3,2
180 180 180,0 181,1 3,6
200 200 200,0 201,2 4,0
225 225 225,0 226,4 4,5
250 250 250,0 251,5 5,0
280 280 280,0 281,7 9,8
315 315 315,0 316,9 11,1
355 355 355,0 357,2 12,5
400 400 400,0 402,4 14,0
450 450 450,0 452,7 15,6
500 500 500,0 503,0 17,5
560 560 560,0 563,4 19,6
630 630 630,0 633,8 22,1
710 710 710,0 716,4 24,9
800 800 800,0 807,2 28,0

In accordance with ISO 11922-1:2018, grade B for sizes ≤ 630 and grade A for sizes ≥ 710,

except for d 40 and 50.
Measurement of out-of-roundness shall be made at the point of manufacturing.

If other values for the out-of-roundness than those given in this table are necessary (e.g.

coiled pipes), they can be agreed between the manufacturer and the end-user.
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SIST EN 1555-2:2021
EN 1555-2:2021 (E)
7.3 Wall thicknesses and related tolerances
7.3.1 Minimum wall thicknesses

The use of any SDR derived from the pipe series S given according to ISO 4065 is permitted.

The minimum wall thickness, e , of pipes with SDR 17 and SDR 11 shall conform to Table 2.

min
Table 2 — Minimum wall thicknesses for pipes of SDR 17 and SDR 11
Dimensions in millimetres
Minimum wall thickness
Nominal size
min
DN/OD
SDR 17 SDR 11
c c
2,3 3,0
c c
2,3 3,0
c c
2,3 3,0
32 2,3 3,0
40 2,4 3,7
50 3,0 4,6
63 3,8 5,8
75 4,5 6,8
90 5,4 8,2
110 6,6 10,0
125 7,4 11,4
140 8,3 12,7
160 9,5 14,6
180 10,7 16,4
200 11,9 18,2
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SIST EN 1555-2:2021
EN 1555-2:2021 (E)
Minimum wall thickness
Nominal size
min
DN/OD
SDR 17 SDR 11
225 13,4 20,5
250 14,8 22,7
280 16,6 25,4
315 18,7 28,6
355 21,1 32,2
400 23,7 36,3
450 26,7 40,9
500 29,7 45,4
560 33,2 50,8
630 37,4 57,2
710 42,1 64,5
800 47,4 72,6
e = e
min n.
In some countries, the SDR 17,6 series is still specified.
The calculated values of e have been rounded up to 2,3 mm
min
for SDR 17 and 3,0 mm for SDR 11, respectively.
7.3.2 Tolerance on the wall thicknesses

The tolerance on the wall thickness at any point shall conform to Table 3 footnote a, which is derived

from grade V of ISO 11922-1:2018.
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SIST EN 1555-2:2021
EN 1555-2:2021 (E)
Table 3 — Tolerances on Wall thicknesses
Dimensions in millimetres
Nominal wall
Nominal wall thickness
Plus
thickness
Plus tolerance
tolerance
a n
b y
> ≤
> ≤
- 2,0 0,3 40,0 41,0 4,2
2,0 3,0 0,4 41,0 42,0 4,3
3,0 4,0 0,5 42,0 43,0 4,4
4,0 5,0 0,6 43,0 44,0 4,5
5,0 6,0 0,7 44,0 45,0 4,6
6,0 7,0 0,8 45,0 46,0 4,7
7,0 8,0 0,9 46,0 47,0 4,8
8,0 9,0 1,0 47,0 48,0 4,9
9,0 10,0 1,1 48,0 49,0 5,0
10,0 11,0 1,2 49,0 50,0 5,1
11,0 12,0 1,3 50,0 51,0 5,2
12,0 13,0 1,4 51,0 52,0 5,3
13,0 14,0 1,5 52,0 53,0 5,4
14,0 15,0 1,6 53,0 54,0 5,5
15,0 16,0 1,7 54,0 55,0 5,6
16,0 17,0 1,8 55,0 56,0 5,7
17,0 18,0 1,9 56,0 57,0 5,8
18,0 19,0 2,0 57,0 58,0 5,9
19,0 20,0 2,1 58,0 59,0 6,0
20,0 21,0 2,2 59,0 60,0 6,1
21,0 22,0 2,3 60,0 61,0 6,2
22,0 23,0 2,4 61,0 62,0 6,3
23,0 24,0 2,5 62,0 63,0 6,4
24,0 25,0 2,6 63,0 64,0 6,5
25,0 26,0 2,7 64,0 65,0 6,6
26,0 27,0 2,8 65,0 66,0 6,7
27,0 28,0 2,9 66,0 67,0 6,8
28,0 29,0 3,0 67,0 68,0 6,9
29,0 30,0 3,1 68,0 69,0 7,0
30,0 31,0 3,2 69,0 70,0 7,1
31,0 32,0 3,3 70,0 71,0 7,2
32,0 33,0 3,4 71,0 72,0 7,3
33,0 34,0 3,5 72,0 73,0 7,4
34,0 35,0 3,6 73,0 74,0 7,5
35,0 36,0 3,7
36,0 37,0 3,8
37,0 38,0 3,9
38,0 39,0 4,0
39,0 40,0 4,1
e = e
min n
+ ty
The tolerance is expressed in the form mm.
– 0
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SIST EN 1555-2:2021
EN 1555-2:2021 (E)
7.4 Circumferential reversion of pipes with a d equal to or greater than 250 mm

The circumferential reversion of pipes with a d equal to or greater than 250 mm shall be determined at

least 48 h after manufacture. The pipe shall be conditioned in water at 80 °C in accordance with

EN ISO 1167-1. The pipe test pieces shall be 3d in length. With the test piece at (23 ± 2) °C,

circumferential measurement shall be made to establish d . made at distance of 0,1d and 1,0d

em n n

respectively from the end of the test piece. The difference between these d measurements shall not be

greater than the d tolerance range specified in Table 1.
7.5 Coiled pipe

During production the pipe shall be coiled such that localized deformation, e.g. buckling and kinking, is

prevented.
The minimum internal diameter of the coil shall be not less than 18dn.
7.6 Lengths

The length of pipe to be supplied is by agreement between purchaser and manufacturer.

8 Mechanical characteristics
8.1 Conditioning

Unless otherwise specified by the applicable test method, the test pieces shall be conditioned at

(23 ± 2) °C before testing in accordance with Table 4.
8.2 Requirements

When tested in accordance with the test methods as specified in Table 4 using the indicated parameters,

the pipe shall have mechanical characteristics conforming to the requirements given in Table 4. The

requirements for pipe that has been subject to squeeze-off are given in Annex C.
Table 4 — Mechanical characteristics
Test parameters
Characteristic Requirements Test method
Parameter Value
Hydrostatic No failure End caps EN ISO 1167-1:2006
Type A of
strength during the test and EN ISO 1167-2
EN ISO 1167-1:2006
period of any
(20 °C, 100 h)
Free
Orientation
test piece
Conditioning time at test
Shall conform to
temperature
EN ISO 1167-1:2006
b 3
Number of test pieces
Water-in-water
Type of test
Circumferential (hoop)
10,0 MPa
stress for: PE 80
12,0 MPa
PE 100 and PE 100-RC
100 h
Test period
20 °C
Test temperature
---------------------- Page: 16 ----------------------
SIST EN 1555-2:2021
EN 1555-2:2021 (E)
Test parameters
Characteristic Requirements Test method
Parameter Value
Hydrostatic No failure End caps EN ISO 1167-1:2006
Type A of
strength during the test and EN ISO 1167-2
EN ISO 1167-1:2006
period of any
(80 °C, 165 h)
Orientation
Free
test piece
Conditioning time at test
Shall conform to
temperature
EN ISO 1167-1:2006
Number of test pieces 3
Type of test
Water-in-Water
Circumferential (hoop)
4,5 MPa
stress for: PE 80
5,4 MPa
PE 100 and PE 100-RC
165 h
Test period
80 °C
Test temperature
Hydr
...

SLOVENSKI STANDARD
oSIST prEN 1555-2:2019
01-december-2019

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

(PE) - 2. del: Cevi

Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 2:

Pipes

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 2: Rohre

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

Polyéthylène (PE) - Partie 2 : Tubes
Ta slovenski standard je istoveten z: prEN 1555-2
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 1555-2:2019 en,fr,de

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

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oSIST prEN 1555-2:2019
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oSIST prEN 1555-2:2019
DRAFT
EUROPEAN STANDARD
prEN 1555-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2019
ICS 23.040.20 Will supersede EN 1555-2:2010
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 2: Pipes

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

distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 2: Rohre

(PE) - Partie 2 : Tubes

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 1555-2:2019 E

worldwide for CEN national Members.
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oSIST prEN 1555-2:2019
prEN 1555-2:2019 (E)
Contents Page

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

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

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

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

3 Terms and definitions, symbols and abbreviations ........................................................................... 7

4 Material .............................................................................................................................................................. 8

4.1 Compound for pipes ....................................................................................................................................... 8

4.2 Compound for identification stripes ........................................................................................................ 8

4.3 External reprocessed and recyclable material .................................................................................... 8

5 General characteristics ................................................................................................................................. 8

5.1 Appearance ....................................................................................................................................................... 8

5.2 Colour .................................................................................................................................................................. 8

6 Geometrical characteristics ........................................................................................................................ 8

6.1 Measurement of dimensions....................................................................................................................... 8

6.2 Mean outside diameters, out-of-roundness (ovality) and tolerances ......................................... 9

6.3 Wall thicknesses and related tolerances .............................................................................................. 10

6.3.1 Minimum wall thicknesses ........................................................................................................................ 10

6.3.2 Tolerance on the wall thicknesses .......................................................................................................... 11

6.3.3 Circumferential reversion of pipes with a d equal to or greater than 250 mm ................... 13

6.3.4 Coiled pipe ....................................................................................................................................................... 13

6.3.5 Lengths .............................................................................................................................................................. 13

7 Mechanical characteristics ........................................................................................................................ 13

7.1 Conditioning ................................................................................................................................................... 13

7.2 Requirements ................................................................................................................................................. 13

7.3 Retest in case of failure at 80 °C ............................................................................................................... 17

8 Physical characteristics .............................................................................................................................. 17

8.1 Conditioning ................................................................................................................................................... 17

8.2 Requirements ................................................................................................................................................. 17

9 Performance requirements ....................................................................................................................... 18

10 Marking ............................................................................................................................................................ 18

10.1 General .............................................................................................................................................................. 18

10.2 Minimum required marking ..................................................................................................................... 19

10.3 Additional marking ...................................................................................................................................... 19

Annex A (normative) Pipes with co-extruded layers .......................................................................................... 20

A.1 General .............................................................................................................................................................. 20

A.2 Material ............................................................................................................................................................ 20

A.3 Geometrical characteristics ...................................................................................................................... 20

A.4 Mechanical characteristics ........................................................................................................................ 20

A.5 Physical characteristics .............................................................................................................................. 20

A.6 Marking ............................................................................................................................................................ 20

A.7 Delamination .................................................................................................................................................. 21

A.8 Integrity of the structure ............................................................................................................................ 21

Annex B (normative) Pipes with peelable layer ................................................................................................... 22

B.1 General .............................................................................................................................................................. 22

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B.2 Geometrical characteristics ...................................................................................................................... 22

B.3 Mechanical characteristics ........................................................................................................................ 22

B.4 Physical characteristics .............................................................................................................................. 22

B.5 Coating adhesion ........................................................................................................................................... 22

B.6 Marking ............................................................................................................................................................ 23

Annex C (normative) Squeeze-off technique ........................................................................................................ 24

C.1 General Squeeze-off technique ................................................................................................................ 24

C.2 Test method .................................................................................................................................................... 24

Bibliography ................................................................................................................................................................. 25

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oSIST prEN 1555-2:2019
prEN 1555-2:2019 (E)
European foreword

This document (prEN 1555-2:2019) 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 enquiry.
This document will supersede EN 1555-2:2010.

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;

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

(this standard);

— 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 [4] 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 1555-2:2019
prEN 1555-2:2019 (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 pipes, are specified in

prEN 1555-1:2019, prEN 1555-3:2019 [1] and prEN 1555-4:2019 [2].

Characteristics for fitness for purpose are covered in prEN 1555-5:2019. CEN/TS 1555-7 [3] gives

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

EN 12007-2:2012 [4] prepared by CEN/TC 234.
This part of EN 1555 covers the characteristics of pipes.
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1 Scope

This document specifies the characteristics of pipes made from polyethylene (PE) 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 and 3 to 5 of EN 1555, it is applicable to PE pipes, 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 can be used, see prEN 1555-5:2019.

EN 1555 covers a range of maximum operating pressures and gives requirements concerning colours and

additives.
It covers three types of pipe:
— PE pipes (outside diameter d ) including any identification stripes;

— PE pipes with co-extruded layers on either or both the outside and/or inside of the pipe (total outside

diameter d ) as specified in Annex A, where all layers have the same MRS rating;

A coextruded pipe made of a combination of PE 100 and PE 100-RC layers shall be regarded as PE

100 and marked accordingly.

— PE pipes (outside diameter d ) with a peelable, contiguous thermoplastics additional layer on the

outside of the pipe (‘coated pipe’) as specified in Annex B.

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 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.

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

General

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

Fitness for purpose of the system

EN 12106, Plastics piping systems — Polyethylene (PE) pipes — Test method for the resistance to internal

pressure after application of squeeze-off

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

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 1167-2, 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 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters (ISO 2505)

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

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

EN ISO 9969, Thermoplastics pipes — Determination of ring stiffness (ISO 9969)

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 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 13968, Plastics piping and ducting systems —Thermoplastics pipes — Determination of ring

flexibility (ISO 13968)
ISO 4065, Thermoplastics pipes — Universal wall thickness table

ISO 13480, Polyethylene pipes — Resistance to slow crack growth — Cone test method

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
squeeze-off

gas flow stopped by squeezing the pipe when compressed between two clamps in such a way that the

distance between both clamps is less than twice the nominal wall thickness
Note 1 to entry: See Annex C.
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oSIST prEN 1555-2:2019
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4 Material
4.1 Compound for pipes

The pipes shall be made from virgin material or own reprocessed material from the same PE compound

or a mixture of both materials. Reprocessed material from coextruded pipes or from pipes reprocessed

with the peelable layer attached shall not be used. Own reprocessed material from the base pipe of

peelable layer pipes can be used.
The compound(s) from which the pipes are made shall conform to prEN 1555-1:2019.
4.2 Compound for identification stripes

For black pipe with yellow or orange identifications stripes (see also 5.2), the compound used for these

identification stripes shall be made from the same base polymer (PE) as one of the pipe compounds for

which fusion compatibility has been proven, see prEN 1555-1:2019.
4.3 External reprocessed and recyclable material

Reprocessed material obtained from external sources and recyclable material shall not be used.

5 General characteristics
5.1 Appearance

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

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

to this document.
The ends of the pipe shall be cut cleanly and square to the axis of the pipe.
5.2 Colour

Pipes shall be black (PE 80, PE 100 and PE 100-RC), yellow (PE 80) or orange (PE 100 and PE 100-RC).

In addition, black PE 80 pipes may be identified by yellow stripes and black PE 100 and PE 100-RC pipes

may be identified by yellow or orange stripes, according to national preference.

The outer coextruded layer of coextruded pipes (see Annex A) or the outer peelable layer of peelable

layer pipes (see Annex B) shall be either black, yellow or orange. In addition, identification stripes may

be used according to national preference.
NOTE National preference for colour can be stated in the national foreword.
6 Geometrical characteristics
6.1 Measurement of dimensions

The dimensions of the pipe shall be measured in accordance with EN ISO 3126, and rounded to the next

0,1 mm. In case of dispute, the measurement shall not be made less than 24 h after manufacture after

being conditioned for at least 4 h at (23 ± 2) °C.

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

shown of correlation.
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6.2 Mean outside diameters, out-of-roundness (ovality) and tolerances
The mean outside diameters of the pipe, d shall conform to Table 1.

For straight pipes, the maximum out-of-roundness shall conform to Table 1. For coiled pipes, the

maximum out-of-roundness shall be specified by agreement between the manufacturer and the end-user.

Table 1 — Mean outside diameters and out-of-roundness
Dimensions in millimetres
Nominal
Nominal Maximum out-of-
outside Mean outside diameter
size roundness for
diameter
b c
DN/OD
straight pipes
d d
dem,max
n em,min
16 16 16,0 16,3 1,2
20 20 20,0 20,3 1,2
25 25 25,0 25,3 1,2
32 32 32,0 32,3 1,3
40 40 40,0 40,4 1,4
50 50 50,0 50,4 1,4
63 63 63,0 63,4 1,5
75 75 75,0 75,5 1,6
90 90 90,0 90,6 1,8
110 110 110,0 110,7 2,2
125 125 125,0 125,8 2,5
140 140 140,0 140,9 2,8
160 160 160,0 161,0 3,2
180 180 180,0 181,1 3,6
200 200 200,0 201,2 4,0
225 225 225,0 226,4 4,5
250 250 250,0 251,5 5,0
280 280 280,0 281,7 9,8
315 315 315,0 316,9 11,1
355 355 355,0 357,2 12,5
400 400 400,0 402,4 14,0
450 450 450,0 452,7 15,6
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oSIST prEN 1555-2:2019
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Nominal
Maximum out-of-
Nominal
outside Mean outside diameter
roundness for
size
diameter
b c
DN/OD straight pipes
d d
dem,max
n em,min
500 500 500,0 503,0 17,5
560 560 560,0 563,4 19,6
630 630 630,0 633,8 22,1
710 710 710,0 716,4 24,9
800 800 800,0 807,2 28,0

In accordance with ISO 11922-1 [6], grade B for sizes ≤ 630 and grade A for sizes ≥ 710

except for dn 40 and 50.
Measurement of out-of-roundness shall be made at the point of manufacturing.

If other values for the out-of-roundness than those given in this table are necessary (eg coiled

pipes), they can be agreed between the manufacturer and the end-user.
6.3 Wall thicknesses and related tolerances
6.3.1 Minimum wall thicknesses

The use of any SDR derived from the pipe series S given according to ISO 4065 is permitted.

The minimum wall thickness, e , of pipes with SDR 17 and SDR 11 shall conform to Table 2.

min
Table 2 — Minimum wall thicknesses for pipes of SDR 17 and SDR 11
Dimensions in millimetres
Minimum wall thickness
Nominal size
min
DN/OD
SDR 17 SDR 11
c c
2,3 3,0
c c
2,3 3,0
c c
2,3 3,0
32 3,0
2,3
40 2,4 3,7
50 3,0 4,6
63 3,8 5,8
75 4,5 6,8
90 5,4 8,2
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Minimum wall thickness
Nominal size
min
DN/OD
SDR 17 SDR 11
110 6,6 10,0
125 7,4 11,4
140 8,3 12,7
160 9,5 14,6
180 10,7 16,4
200 11,9 18,2
225 13,4 20,5
250 14,8 22,7
280 16,6 25,4
315 18,7 28,6
355 21,1 32,2
400 23,7 36,3
450 26,7 40,9
500 29,7 45,4
560 33,2 50,8
630 37,4 57,2
710 42,1 64,5
800 47,4 72,6
e = e .
min n
In some countries, the SDR 17,6 series is still specified.
The calculated values of e have been rounded up to 2,3 mm
min
for SDR 17 and 3,0 mm for SDR 11, respectively.
6.3.2 Tolerance on the wall thicknesses

The tolerance on the wall thickness at any point shall conform to Table 3 footnote a, which is derived

from grade V of ISO 11922-1 [6].
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Table 3 — Tolerance on wall thicknesses
Dimensions in millimetres
Nominal wall thickness Plus Nominal wall thickness Plus
a tolerance a tolerance
e e
n n
b b
t t
y y
> ≤ > ≤
− 2,0 0,3 30,0 31,0 3,2
2,0 3,0 0,4 31,0 32,0 3,3
3,0 4,0 0,5 32,0 33,0 3,4
4,0 5,0 0,6 33,0 34,0 3,5
5,0 6,0 0,7 34,0 35,0 3,6
6,0 7,0 0,8 35,0 36,0 3,7
7,0 8,0 0,9 36,0 37,0 3,8
8,0 9,0 1,0 37,0 38,0 3,9
9,0 10,0 1,1 38,0 39,0 4,0
10,0 11,0 1,2 39,0 40,0 4,1
11,0 12,0 1,3 40,0 41,0 4,2
12,0 13,0 1,4 41,0 42,0 4,3
13,0 14,0 1,5 42,0 43,0 4,4
14,0 15,0 1,6 43,0 44,0 4,5
15,0 16,0 1,7 44,0 45,0 4,6
16,0 17,0 1,8 45,0 46,0 4,7
17,0 18,0 1,9 46,0 47,0 4,8
18,0 19,0 2,0 47,0 48,0 4,9
19,0 20,0 2,1 48,0 49,0 5,0
20,0 21,0 2,2 49,0 50,0 5,1
21,0 22,0 2,3 50,0 51,0 5,2
22,0 23,0 2,4 51,0 52,0 5,3
23,0 24,0 2,5 52,0 53,0 5,4
24,0 25,0 2,6 53,0 54,0 5,5
25,0 26,0 2,7 54,0 55,0 5,6
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oSIST prEN 1555-2:2019
prEN 1555-2:2019 (E)
Nominal wall thickness Plus Nominal wall thickness Plus
tolerance tolerance
a a
e e
n n
b b
t t
y y
> ≤ > ≤
26,0 27,0 2,8 55,0 56,0 5,7
27,0 28,0 2,9 56,0 57,0 5,8
28,0 29,0 3,0 57,0 58,0 5,9
29,0 30,0 3,1
e = e
min n
b 0
The tolerance is expressed in the form mm.

6.3.3 Circumferential reversion of pipes with a d equal to or greater than 250 mm

The circumferential reversion of pipes with a d equal to or greater than 250 mm shall be determined

between 24 h and 48 h after manufacture and after conditioning in water at 80 °C. The conditioning shall

be in accordance with EN ISO 1167-1. The pipe test pieces shall be 3d in length. With the test piece at

(23 ± 2) °C, circumferential measurement shall be made to establish d . made at distance of 0,1d and

em n

1,0d respectively from the end of the test piece. The difference between these d measurements shall

n em
not be greater than the d tolerance range specified in Table 1.
6.3.4 Coiled pipe

During production the pipe shall be coiled such that localized deformation, e.g. buckling and kinking, is

prevented.
The minimum internal diameter of the coil shall be not less than 18d .
6.3.5 Lengths

The length of pipe to be supplied is by agreement between purchaser and manufacturer.

7 Mechanical characteristics
7.1 Conditioning

Unless otherwise specified by the applicable test method, the test pieces shall be conditioned at

(23 ± 2) °C before testing in accordance with Table 4.
7.2 Requirements

When tested in accordance with the test methods as specified in Table 4 using the indicated parameters,

the pipe shall have mechanical characteristics conforming to the requirements given in Table 4. The

requirements for squeeze-off pipe are given in Annex C.
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oSIST prEN 1555-2:2019
prEN 1555-2:2019 (E)
Table 4 — Mechanical characteristics
Test parameters
Characteristic Requirements Test method
Parameter Value
Hydrostatic No failure End caps Type A of
EN ISO 1167‑1
strength during the test Orientation
EN ISO 1167‑1
and
(20 °C, 100 h) period of any Conditioning time at test
EN ISO 1167‑2
Free
test piece temperature
Shall conform to
Number of test pieces
EN ISO 1167‑1
Type of test
Circumferential (hoop)
Water-in-water
stress for: PE 80
PE 100 and PE 100-RC
10 MPa
Test period
12,0 MPa
Test temperature
100 h
20 °C
Hydrostatic No failure End caps Type A of EN ISO 1167‑1
strength during the test Orientation EN ISO 1167‑1
and
(80 °C, 165 h) period of any Conditioning time at test
EN ISO 1167‑2
Free
temperature
test piece
Shall conform to
Number of test pieces
EN ISO 1167‑1
Type of test
Circumferential (hoop)
Water-in-water
stress for: PE 80
PE 100 and PE 100-RC
4,5 MPa
Test period
5,4 MPa
Test temperature
165 h
80 °C
Hydrostatic No failure End
...

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