SIST EN 1555-1:2021

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

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 bar1 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.

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

Dieses Dokument legt die allgemeinen Anforderungen an Rohrleitungssysteme aus Polyethylen (PE) fest, die in der Versorgung mit gasförmigen Brennstoffen eingesetzt werden.
Es legt auch die Prüfparameter für die Prüfverfahren fest, auf die in diesem Dokument verwiesen wird.
In Verbindung mit 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) für einen maximal zulässigen Betriebsdruck MOP (en: maximum operating pressure) von höchstens 10 bar1 bei einer Bezugstemperatur von 20 °C für Bemessungszwecke;
b) für eine Betriebstemperatur zwischen −20 °C und 40 °C.
ANMERKUNG 1 Für Betriebstemperaturen zwischen 20 °C und 40 °C sind Minderungsfaktoren festgelegt, siehe EN 1555-5 [3].
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 Kriterien die geeignete Auswahl zu treffen, unter Berücksichtigung ihrer spezifischen Anforderungen und jeglicher relevanter 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 le présent 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, inférieure ou égale à 10 bar1, à une température de référence de
20 °C pour les besoins des calculs ;
b) une température de service comprise entre –20 °C et 40 °C.
NOTE 1 Pour des températures de service comprises entre 20 °C et 40 °C, des facteurs de réduction sont définis ; voir l’EN 1555-5 [3].
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: Withdrawn
• Public Enquiry End Date: 19-Dec-2019
• Publication Date: 22-Jul-2021
• Withdrawal Date: 19-Oct-2025
• ICS: 83.140.30 - Plastics pipes and fittings for non fluid use
• ICS: 91.140.40 - Gas supply systems
• Technical Committee: PCV - Plastic pipes, fittings and valves
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 20-Oct-2025
• Due Date: 12-Nov-2025
• Completion Date: 20-Oct-2025
• Ref Project: EN 1555-1:2021 - Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 1: General

Relations

• Replaces: SIST EN 1555-1:2010 - Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 1: General
• Effective Date: 01-Sep-2021
• Revised: SIST EN 1555-1:2025 - Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 1: General
• Effective Date: 26-Apr-2023

Standards Content (Sample)

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

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.

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
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.
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.
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.
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 .
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.
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
d
n
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
d
e
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
d
em
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
d
em,min
minimum value for the mean outside diameter as specified for a given nominal size
3.1.6
maximum mean outside diameter
d
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
e
n
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
e
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
e
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
e
max
maximum value for the wall thickness at any point around the circumference of a component, as specified
3.1.12
mean wall thickness
e
m
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
3.1.14
wall thickness tolerance
t
y
permitted difference between the wall thickness at any point, e, and the nominal wall thickness, e
n
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
S
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
S=
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
3.3 Definitions related to material characteristics
3.3.1
lower confidence limit of the predicted hydrostatic strength
σ
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
C
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
σ
s
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 =
S
C
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.
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 fittin
...