Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 6: Specific functional recommendations for unplasticized polyamide (PA-U)

This Technical Specification describes specific functional recommendations for the safe
design, handling, installation and operation of unplasticized polyamide (PA-U) gas piping
systems with fusion jointing and mechanical jointing with
a)  a maximum operating pressure (MOP) up to and including 16 bar;
b)  an operating temperature between -20 °C and +40 °C.
This Technical Specification covers PA pipes single layer solid wall.
This Technical Specification should be applied complementary to the functional requirements
in EN 12007-2.

Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis einschließlich 16 bar - Teil 6: Spezifische funktionale Anforderungen für weichmacherfreies Polyamid

Dieses Dokument beschreibt, in Ergänzung zu den allgemeinen funktionalen Anforderungen von EN 12007-1, die besonderen funktionalen Anforderungen an Rohrleitungen aus Polyamid (PA) für:
a) einen maximal zulässigen Betriebsdruck (MOP) bis zu 16 bar;
b) und einer Betriebstemperatur von −20 °C und +40 °C.
Dieses Dokument umfasst einen Rohrtyp:
— einschichtige PA-Rohre mit fester Wand.
Dieses Dokument legt gemeinsame Grundprinzipien für die Gasinfrastruktur fest.
ANMERKUNG 1 Die Anwender dieses Dokuments sind sich bewusst, dass detailliertere nationale Normen und/oder Verfahrensregeln in den CEN-Mitgliedstaaten bestehen können.
Dieses Dokument soll in Verbindung mit diesen, die oben erwähnten allgemeinen Grundsätze darlegenden nationalen Normen und/oder Technischen Regeln angewendet werden.
ANMERKUNG 2 Für den Fall eines Konflikts zwischen strengeren nationalen gesetzlichen Anforderungen/Bestimmungen und den Anforderungen diesem Dokument ist den nationalen gesetzlichen Anforderungen/Bestimmungen wie in CEN/TR 13737 (alle Teile) ausgeführt Vorrang einzuräumen.
CEN/TR 13737 (alle Teile) enthält
— eine Klarstellung aller geltenden Rechtsvorschriften/Bestimmungen eines Mitgliedsstaats;
— ggf. weitergehende strengere nationale Anforderungen;
— einen nationalen Ansprechpartner für die Weitergabe neuester Informationen.

Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 bar - Partie 6 : Recommandations fonctionnelles spécifiques pour le polyamide non plastifié (PA-U)

Le présent document décrit les exigences fonctionnelles particulières pour les canalisations en polyamide (PA) en complément des exigences fonctionnelles générales de l'EN 12007-1 pour :
a) une pression maximale de service (MOP) inférieure ou égale à 16 bar ;
b) une température d'exploitation comprise entre -20 °C et +40 °C.
Le présent document couvre un seul type de tube :
 tubes en polyamide à paroi solide monocouche.
Le présent document spécifie les principes de base communs pour les infrastructures gazières.
NOTE 1 Les utilisateurs du présent document gardent à l'esprit l'existence éventuelle, dans les pays membres du CEN, de codes de pratique et/ou de normes nationales plus détaillés.
Le présent document est destiné à être appliqué conjointement avec ces normes nationales et/ou codes de pratique, qui détaillent les principes de base précités.
NOTE 2 En cas de conflits liés à des exigences législatives/réglementaires plus restrictives que les prescriptions du présent document, la législation/réglementation nationale doit prévaloir, comme illustré dans le CEN/TR 13737 (toutes parties).
Le CEN/TR 13737 (toutes parties) fournit :
 la clarification des législations/règles pertinentes applicables dans un pays membre ;
 si approprié, les exigences nationales plus restrictives ;
 un contact national pour les dernières informations.

Infrastruktura za plin - Cevovodni sistemi za najvišji delovni tlak do vključno 16 bar - 6. del: Posebne funkcionalne zahteve za neplastificirani (nemehčani) poliamid (PA-U)

General Information

Status
Published
Public Enquiry End Date
02-Dec-2020
Publication Date
13-Apr-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Mar-2021
Due Date
24-May-2021
Completion Date
14-Apr-2021

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SLOVENSKI STANDARD
SIST-TS CEN/TS 12007-6:2021
01-maj-2021

Infrastruktura za plin - Cevovodni sistemi za najvišji delovni tlak do vključno 16

bar - 6. del: Posebne funkcionalne zahteve za neplastificirani (nemehčani)
poliamid (PA-U)

Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar

- Part 6: Specific functional recommendations for unplasticized polyamide (PA-U)
Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis
einschließlich 16 bar - Teil 6: Spezifische funktionale Anforderungen für
weichmacherfreies Polyamid

Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou

égale à 16 bar - Partie 6 : Recommandations fonctionnelles spécifiques pour le
polyamide non plastifié (PA-U)
Ta slovenski standard je istoveten z: CEN/TS 12007-6:2021
ICS:
83.140.40 Gumene cevi Hoses
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
SIST-TS CEN/TS 12007-6:2021 en,fr,de

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

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SIST-TS CEN/TS 12007-6:2021
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SIST-TS CEN/TS 12007-6:2021
CEN/TS 12007-6
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
March 2021
TECHNISCHE SPEZIFIKATION
ICS 23.040.20
English Version
Gas infrastructure - Pipelines for maximum operating
pressure up to and including 16 bar - Part 6: Specific
functional recommendations for unplasticized polyamide
(PA-U)

Infrastructures gazières - Canalisations pour pression Gasinfrastruktur - Rohrleitungen mit einem maximal

maximale de service inférieure ou égale à 16 bar - zulässigen Betriebsdruck bis einschließlich 16 bar -

Partie 6 : Recommandations fonctionnelles spécifiques Teil 6: Spezifische funktionale Anforderungen für

pour le polyamide non plastifié (PA-U) weichmacherfreies Polyamid

This Technical Specification (CEN/TS) was approved by CEN on 25 January 2021 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to

submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS

available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in

parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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. CEN/TS 12007-6:2021 E

worldwide for CEN national Members.
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CEN/TS 12007-6:2021 (E)
Contents Page

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

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

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 5

4 Symbols and abbreviations ......................................................................................................................... 6

5 Design .................................................................................................................................................................. 7

5.1 General ................................................................................................................................................................ 7

5.2 Materials and components .......................................................................................................................... 7

5.3 Maximum operating pressure .................................................................................................................... 7

5.3.1 General ................................................................................................................................................................ 7

5.3.2 Verification of the overall service (design) coefficient ..................................................................... 7

5.3.3 Verification of the RCP criterion ................................................................................................................ 7

5.4 Assembly techniques ..................................................................................................................................... 9

5.5 Material properties for flow stopping by squeeze-off ....................................................................... 9

6 Construction ...................................................................................................................................................... 9

6.1 Storage, handling and transportation ..................................................................................................... 9

6.2 Jointing ............................................................................................................................................................. 10

6.2.1 General ............................................................................................................................................................. 10

6.2.2 Fusion jointing .............................................................................................................................................. 10

6.2.3 Mechanical joints.......................................................................................................................................... 11

6.3 Laying ............................................................................................................................................................... 11

6.4 Connection to existing systems ............................................................................................................... 13

6.4.1 Static electricity ............................................................................................................................................ 13

6.4.2 Squeeze-off ..................................................................................................................................................... 13

7 Quality control .............................................................................................................................................. 13

7.1 Inspection prior to installation ............................................................................................................... 13

7.2 Inspection during laying ............................................................................................................................ 13

7.2.1 Laying ............................................................................................................................................................... 13

7.2.2 Joint integrity ................................................................................................................................................. 13

8 Pressure testing ............................................................................................................................................ 14

9 Influence of media on PA-U ...................................................................................................................... 14

Annex A (informative) Storage, handling and transportation .................................................................. 15

Annex B (informative) Fusion joint integrity .................................................................................................. 19

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

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CEN/TS 12007-6:2021 (E)
European foreword

This document (CEN/TS 12007-6:2021) has been prepared by Technical Committee CEN/TC 234 “Gas

infrastructure”, the secretariat of which is held by DIN.

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.

The basis if this document has been provided by an Ad Hoc group of interested parties consisting

variously of pipe manufacturers, material suppliers and gas network engineers. The aim is to support

the introduction of Polyamide pipe, PA-U, into Europe for use in natural gas pipe networks operating at

working pressures up to and including 16 bar. The Secretariat of the Ad Hoc group was held by NEN.

This document is part of the following series of standards, of which the parts 1 to 4 and this document

are in the responsibility of CEN/TC 234 Working Group 2, Secretariat held by BSI and of which part 5 is

in the responsibility of CEN/TC 234 Working Group 10, Secretariat held by NSAI:
— Part 1: General functional requirements

— Part 2: Specific functional requirements for polyethylene (MOP up to and including 10 bar)

— Part 3: Specific functional requirements for steel
— Part 4: Specific functional requirements for renovation

This document has been written in the style and form of the above functional EN standards, but at this

time has the status only of a CEN TS. This document will be amended under the authority of CEN/TC

234 as soon as more supporting evidence of the safe use of PA-U becomes available.

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

following countries are bound to announce this Technical Specification: 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-TS CEN/TS 12007-6:2021
CEN/TS 12007-6:2021 (E)
1 Scope

This document describes the specific functional requirements for polyamide (PA) pipelines in addition

to the general functional requirements of EN 12007-1 for:
a) a maximum operating pressure (MOP) up to and including 16 bar;
b) an operating temperature between −20 °C and +40 °C.
This document covers one type of pipe:
— PA pipes single layer solid wall.
This document specifies common basic principles for gas infrastructure.

NOTE 1 Users of this document are aware that more detailed national standards and/or code of practice can

exist in the CEN member countries.

This document is intended to be applied in association with these national standards and/or codes of

practice setting out the above-mentioned basic principles.

NOTE 2 In the event of conflicts in terms of more restrictive requirements in national legislation/regulation

with the requirements of this document, the national legislation/regulation takes precedence as illustrated in

CEN/TR 13737 (all parts).
CEN/TR 13737 (all parts) give:
— clarification of all legislations/regulations applicable in a member state;
— if appropriate, more restrictive national requirements;
— a national contact point for the latest information.
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 ISO 16486-1:2020, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide

(PA-U) piping systems with fusion jointing and mechanical jointing — Part 1: General (ISO 16486-1)

EN ISO 16486-2:2020, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide

(PA-U) piping systems with fusion jointing and mechanical jointing — Part 2: Pipes (ISO 16486-2)

EN ISO 16486-3, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)

piping systems with fusion jointing and mechanical jointing — Part 3: Fittings (ISO 16486-3)

EN ISO 16486-4, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)

piping systems with fusion jointing and mechanical jointing — Part 4: Valves

EN ISO 16486-5, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)

piping systems with fusion jointing and mechanical jointing — Part 5: Fitness for purpose of the system

(ISO/DIS 16486-5)
Under preparation. Stage at the time of publication: prEN ISO 16486-4.
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CEN/TS 12007-6:2021 (E)

EN 12327, Gas infrastructure — Pressure testing, commissioning and decommissioning procedures -

Functional requirements

ISO 12176-1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1:

Butt fusion

ISO 12176-2, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 2:

Electrofusion

ISO 17885, Plastic piping systems — Mechanical fittings for pressure piping systems — Specifications

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
nominal outside diameter
specified outside diameter
3.2
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
3.3
standard dimension ratio
SDR

number approximately equal to the quotient of the nominal outside diameter and the nominal wall

thickness
3.4
maximum operating pressure
MOP

maximum pressure at which a system can be operated continuously under normal operating conditions

Note 1 to entry: Normal operating conditions are: no fault in any device or stream.

Under preparation. Stage at the time of publication: prEN ISO 16486-5.
This standard is also applicable for PA-U without any changes.
This standard is also applicable for PA-U without any changes
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CEN/TS 12007-6:2021 (E)
3.5
maximum incidental pressure
MIP

maximum pressure which a system can experience during a short time limited by the safety devices

3.6
butt fusion joint

method of jointing PA-U pipes and fittings where the two pipe ends are heated and brought together to

be fused without the use of a separate fitting or filler material
3.7
electrofusion joint

method of jointing PA-U pipes, using fittings which have an integrated electric heating element

3.8
squeeze-off
act of squeezing a pipe to prevent the flow of gas
3.9
minimum required strength
MRS

value of the lower confidence limit rounded down to the next lower value of the R10 series when the

lower confidence limit is below 10 MPa, or to the next lower value of the R20 series when the lower

confidence limit is 10 MPa or greater

Note 1 to entry: R10 and R20 series are the Renard number series conforming to ISO 3 and ISO 497.

3.10
lower confidence limit
LCL

quantity, expressed in MPa, which can be considered as a material property, representing the 97,5 %

lower confidence limit of the predicted long term hydrostatic strength for water at 20 °C for 50 years

3.11
critical rapid crack propagation pressure
RCP

pressure level at which a rapid crack propagation (RCP) can occur in a PA-U pipeline, defined at a

reference temperature
Note 1 to entry: Reference temperature is 0 °C.
4 Symbols and abbreviations
PA-U unplasticized polyamide
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CEN/TS 12007-6:2021 (E)
5 Design
5.1 General

The PA-U products are covered by CEN/TC 155, Plastics piping systems and ducting systems. Purchasing

products to CEN standards can be part of a quality programme to ensure the safety and integrity of gas

systems over their design life in service.

The selection of materials, SDR series, dimensions and assembling techniques shall be the responsibility

of the pipeline operator.
5.2 Materials and components

PA-U materials and components used shall comply with EN ISO 16486-1, EN ISO 16486-2,

1 2
EN ISO 16486-3, EN ISO 16486-4 and EN ISO 16486-5 .

Other components not covered by future EN ISO 16486-1, EN ISO 16486-2, EN ISO 16486-3,

1 2

EN ISO 16486-4 and EN ISO 16486-5 shall conform to the relevant European Standards and

International Standards or, in their absence, to national or other established standards and shall be fit

for their purpose.
5.3 Maximum operating pressure
5.3.1 General

The MOP should be selected on the basis of the gas infrastructure operating requirements provided that

the MOP does not exceed 16 bar and the conditions in 5.3.2 and 5.3.3 are satisfied.

5.3.2 Verification of the overall service (design) coefficient

The overall service (design) coefficient C shall be calculated using the formula as given below and in

Figure 1 shall be greater than or equal to 2. This coefficient C takes into consideration service conditions

as well as the properties and components of a pipeline.
20× MRS
(1)
MOP× SDR−×1 D
( )
All pressures measured in bar.

Derating factor (D ) is a coefficient used in the calculation of MOP which takes into account the

influence of operating temperature.

NOTE Derating factors are listed in Annex A of ISO 16486-6:2012 will be moved to Annex A of

EN ISO 16486-5 during the ongoing revision.
5.3.3 Verification of the RCP criterion

The ratio of critical RCP pressure to MOP shall be greater than or equal to 1,5 (according to

EN ISO 16486-2)

The RCP criterion is the critical pressure, is dependent on pipe size and material, and shall be

determined in accordance with EN ISO 16486-2.
The critical RCP pressure is based on a temperature of 0 °C.
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SIST-TS CEN/TS 12007-6:2021
CEN/TS 12007-6:2021 (E)

Where pipe temperature decreases below 0 °C the P /MOP ratio should be recalculated in

RCP

accordance with EN ISO 16486-5 using a value of RCP pressure determined from the minimum

expected operating temperature of the pipe. The value of MOP should be reduced so as to maintain the

P /MOP ratio at a value greater than or equal to 1,5. See Figure 1.
RCP
Key
P pressure levels
P critical rapid crack propagation pressure
RCP
STP maximum strength test pressure
max
STP minimum strength test pressure
min
MIP maximum incidental pressure
MOP maximum operating pressure
Figure 1 — Pressure conditions in a PA-U-system
System design:
20× MRS
MOP≤
C× SDR−×1 D
( )
RCP
MOP≤
(2)
1,5
Pressure testing:
20MRS
1,5× MOP≤ STP≤ (3)
SDR− 1
MIP< STP≤ 09, P
(4)
RCP
NOTE For RCP conditions see EN ISO 16486-2 and EN ISO 16486-5 .
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5.4 Assembly techniques
Jointing procedures can vary depending upon the PA-U material and sizes used.
The acceptable jointing methods that shall be used are:
— fusion joints; or
— mechanical joints.

Joints made between new and existing PA-U gas pipework shall be compatible with the materials being

joined.

Components made from PA-U 11 shall be heat fusion jointed only to components made from PA-U 11.

Components made from PA-U 12 shall be heat fusion jointed only to components made from PA-U 12.

Components made from PA-U are not fusion compatible with components made from other polymers.

NOTE Test methods for assuring fusibility are given in EN ISO 16486-3 and EN ISO 16486-5 .

The fusion jointing techniques for the construction of PA-U pipelines shall be butt fusion and

electrofusion.

Written jointing procedures, authorized by the pipeline operator, shall be available prior to the

construction of a pipeline.
5.5 Material properties for flow stopping by squeeze-off

When squeeze-off techniques are considered, the suitability of pipe for squeeze-off shall be established

in accordance with EN ISO 16486-2:2020, Annex A, as the described methodology is applicable for PA-

NOTE In publication [8] the squeeze-off behaviour of PA-U 12 pipes is shown.
6 Construction
6.1 Storage, handling and transportation

Care shall be taken during the transport, handling and storage of pipes, fittings and other components

to ensure at all stages that their specified properties and conditions, which can be affected by

environmental factors, are preserved and that physical damage and distortions are avoided.

Pipes and fittings shall be inspected and those pipes with surface defects deeper than 10 % of the

nominal wall thickness shall not be used. For pipe areas which are foreseen for jointing the surface shall

be free of damages which would potentially effect the life time of the system.

PA-U pipes and fittings stored outside are subjected to UV degradation when exposed to direct daylight.

PA-U materials are stabilized to give protection for a UV radiation level of 3,5 GJ/m . National bodies

should give recommendations for allowed storage times in their countries. The average radiation level

for one year in European countries are given in Figure 2.
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CEN/TS 12007-6:2021 (E)

Figure 2 — Isobaric curves of global radiation in gigajoules per square metre per year in Europe

Pipes shall not be used where it is considered that they have exceeded the maximum UV exposure limit,

unless they have been tested to demonstrate acceptable performance in accordance with existing

standards.

Further guidance on storage, handling and transportation of PA-U pipes and fittings is given in Annex A.

6.2 Jointing
6.2.1 General

Proven competence in PE jointing methods in accordance with national or local standards is the

minimum requirement in combination with a PA specific instruction, considering also the higher safety

demands of high pressure gas piping systems.
NOTE The inclusion of PA-U is also foreseen in EN 13067:2020.

Jointing procedures shall be carefully followed to obtain good quality joints. Cleanliness and the

absence of stress are essential for reliable joints.
6.2.2 Fusion jointing

Fusion equipment shall conform to ISO 12176-1 for butt fusion. Procedures on butt fusion jointing are

given in ISO 21307, the fusion jointing parameters for PA-U can be taken from ISO 16486 series.

NOTE 1 For dual low pressure fusion jointing procedure no parameters have been verified.

Fusion equipment shall conform to ISO 12176-2 for electrofusion. Refer to the manufacturer’s

instructions for electrofusion jointing.

NOTE 2 ISO 12176-1 and ISO 12176-2. These standards are applicable to PA-U as well. The same machines can

be used with different settings.
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Consideration shall be given to the use of shielding, end caps or longer heating times when jointing in

adverse weather conditions.

NOTE 3 Harsh environmental conditions (like strong wind, cold temperatures, rain, extreme humidity, high

dust loads, etc.) or contamination can reduce the quality of the PA fusion joint, when not protected.

Pipes and/or fittings with fusion ends of different SDR values shall not be jointed by butt fusion.

The following are minimum requirements for the assembly of fusion joints:
— cleaning of the pipe and/or fitting ends and the surface of the heated tools;
— protection against dust and other contaminating influences;
— clamping of the pipe and/or fitting ends;
— verification of the alignment and the gap between fitting and/or pipe ends;
— use of re-rounding clamps where pipe ovality exists;
— preparation of the fusion surfaces;
— marking for depth of penetration into the electrofusion sockets;

— maintenance and correct functioning of the fusion equipment and check of its compatibility with

the required parameters;

— taking into account the fusion parameters as written in the jointing procedure.

6.2.3 Mechanical joints
6.2.3.1 General

All mechanical fittings including transition fittings shall comply with the ISO 16486 series and

ISO 17885.

All mechanical joints shall be assembled in accordance with the manufacturer’s instructions and the

metallic parts of fittings shall be corrosion resistant or protected against corrosion.

Satisfactory mechanical jointing procedures based upon recognized standards, manufacturers'

instructions and the experience of the pipeline operator shall be utilized.
6.2.3.2 Flanged joints
Flanged joints shall be made using the appropriate jointing material.
6.2.3.3 Threaded joints
PA-U pipes shall not be threaded.
6.3 Laying

Care shall be taken to prevent damage to the pipes and fittings during the whole process of laying.

Changes of direction of a PA-U pipeline during construction shall be achieved by means of preformed

bends or elbow fittings or by the natural flexibility of the PA-U pipe within limits. Natural flexing may be

used for bend radii greater than or equal to 25 × d mm, and for smaller radii dependent upon the SDR

and material properties based on operational experience and good engineering practice.

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For pipes made of any thermoplastic materials for the minimum bending radii also ambient

temperature influences have to be considered.

Machine bending of pipes or bending following the application of heat shall not be used.

PA-U pipes, fittings and valves installed above ground shall be protected against mechanical

interference and UV degradation.

When using carrier pipes the gas pipe should be adequately supported. To prevent damage, contact

with sharp edges should be avoided.

When tightening or untightening a mechanical joint movement, shall not be transmitted to the pipe.

EXAMPLE Torsion.

Consideration shall be given during the laying process to the potential effects on the pipe of relative

movements of the ground or adjacent constructions or from temperature variations.

Where the PA-U pipe is laid by drag, care shall be taken that the drag force is not greater than the values

(in newtons) given by the formula:
σ×Π × d
(5)
SF× SDR
yield
(6)
1,25
where
F is the maximum drag force, in newtons;
σ is the limiting stress in the PA-U in MPA;
σ is the tensile stress at yield in MPA;
yield
d is the outside nominal diameter of the pipe;
SF is the safety factor;
SDR is the standard dimension ratio;
d is the external diameter of the pipe, in millimetres.

Pipes shall not be overstressed by tensile forces during laying: The limiting stress shall be 1,25 times

lower than the yield stress for the relevant temperature, as provided by the resin producer.

A safety factor between 2 and 3 is recommended, depending on site and installation conditions.

Other values of limiting stress σ and safety factor SF may be used for given grades of PA-U on the

engineer’s responsibility to ensure safety.

Stresses caused by different temperatures between laying and operation shall be considered.

Valves shall be installed so that they do not expose the PA-U pipe to unnecessary stress during opening

and closing cycles.

Material around the pipe shall be compacted so as to avoid excessive pipe ovality and shall be done

layer by layer.

Backfill materials around the pipe shall be selected to prevent damage to the pipe from contact with

sharp edges during and after compaction.
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6.4 Connection to existing systems
6.4.1 Static electricity

Where there can be a release of gas in the working area, static charge accumulation shall be avoided.

EXAMPLE Draping water
...

SLOVENSKI STANDARD
kSIST-TS FprCEN/TS 12007-6:2020
01-november-2020

Infrastruktura za plin - Cevovodni sistemi za najvišji delovni tlak do vključno 16

bar - 6. del: Posebne funkcionalne zahteve za neplastificirani poliamid (PA-U)

Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar

- Part 6: Specific functional recommendations for unplasticized polyamide (PA-U)
Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis
einschließlich 16 bar - Teil 6: Spezifische funktionale Anforderungen für
weichmacherfreies Polyamid

Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou

égale à 16 bar - Partie 6 : Recommandations fonctionnelles spécifiques pour le
polyamide non plastifié (PA-U)
Ta slovenski standard je istoveten z: FprCEN/TS 12007-6
ICS:
83.140.40 Gumene cevi Hoses
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
kSIST-TS FprCEN/TS 12007-6:2020 en,fr,de

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

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kSIST-TS FprCEN/TS 12007-6:2020
FINAL DRAFT
TECHNICAL SPECIFICATION
FprCEN/TS 12007-6
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
October 2020
ICS 23.040.20
English Version
Gas infrastructure - Pipelines for maximum operating
pressure up to and including 16 bar - Part 6: Specific
functional recommendations for unplasticized polyamide
(PA-U)

Infrastructures gazières - Canalisations pour pression Gasinfrastruktur - Rohrleitungen mit einem maximal

maximale de service inférieure ou égale à 16 bar - zulässigen Betriebsdruck bis einschließlich 16 bar -

Partie 6 : Recommandations fonctionnelles spécifiques Teil 6: Spezifische funktionale Anforderungen für

pour le polyamide non plastifié (PA-U) weichmacherfreies Polyamid

This draft Technical Specification is submitted to CEN members for Vote. It has been drawn up by the Technical Committee

CEN/TC 234.

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 Technical Specification. It is distributed for review and comments. It is subject to change

without notice and shall not be referred to as a Technical Specification.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TS 12007-6:2020 E

worldwide for CEN national Members.
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Contents Page

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

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

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

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

4 Symbols and abbreviations ......................................................................................................................... 7

5 Design .................................................................................................................................................................. 8

5.1 General ................................................................................................................................................................ 8

5.2 Materials and components .......................................................................................................................... 8

5.3 Maximum operating pressure .................................................................................................................... 8

5.3.1 General ................................................................................................................................................................ 8

5.3.2 Verification of the overall service (design) coefficient ..................................................................... 8

5.3.3 Verification of the RCP criterion ................................................................................................................ 8

5.4 Assembly techniques .................................................................................................................................. 10

5.5 Material properties for flow stopping by squeeze-off .................................................................... 10

6 Construction ................................................................................................................................................... 10

6.1 Storage, handling and transportation .................................................................................................. 10

6.2 Jointing ............................................................................................................................................................. 11

6.2.1 General ............................................................................................................................................................. 11

6.2.2 Fusion jointing .............................................................................................................................................. 11

6.2.3 Mechanical joints.......................................................................................................................................... 12

6.3 Laying ............................................................................................................................................................... 12

6.4 Connection to existing systems ............................................................................................................... 14

6.4.1 Static electricity ............................................................................................................................................ 14

6.4.2 Squeeze-off ..................................................................................................................................................... 14

7 Quality control .............................................................................................................................................. 14

7.1 Inspection prior to installation ............................................................................................................... 14

7.2 Inspection during laying ............................................................................................................................ 14

7.2.1 Laying ............................................................................................................................................................... 14

7.2.2 Joint integrity ................................................................................................................................................. 14

8 Pressure testing ............................................................................................................................................ 15

9 Influence of media on PA-U ...................................................................................................................... 15

Annex A (informative) Storage, handling and transportation .................................................................. 16

A.1 General ............................................................................................................................................................. 16

A.2 Storage ............................................................................................................................................................. 16

A.2.1 Storage conditions ....................................................................................................................................... 16

A.2.2 Bundles ............................................................................................................................................................ 16

A.2.3 Stacking loose straight pipes ................................................................................................................... 17

A.2.4 Drums and coils ............................................................................................................................................ 17

A.2.5 Storing .............................................................................................................................................................. 17

A.2.6 First in − first out .......................................................................................................................................... 18

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A.3 Handling ........................................................................................................................................................... 18

A.3.1 General ............................................................................................................................................................. 18

A.3.2 Handling in cold weather ........................................................................................................................... 18

A.3.3 Straight pipes ................................................................................................................................................. 18

A.3.4 Coils ................................................................................................................................................................... 18

A.3.5 Drums ................................................................................................................................................................ 18

A.3.6 Uncoiling and unrolling .............................................................................................................................. 19

A.4 Transportation .............................................................................................................................................. 19

A.4.1 Straight pipes ................................................................................................................................................. 19

A.4.2 Coiled pipe ....................................................................................................................................................... 19

A.4.3 Drums ................................................................................................................................................................ 19

Annex B (informative) Fusion joint integrity .................................................................................................. 20

B.1 General ............................................................................................................................................................. 20

B.2 Visual inspection criteria ........................................................................................................................... 20

B.2.1 General ............................................................................................................................................................. 20

B.2.2 Butt fusion guidelines for the visual examination of butt fusion joints .................................... 20

B.2.2.1 Bead symmetry .............................................................................................................................................. 20

B.2.2.2 Bead Appearance .......................................................................................................................................... 20

B.2.2.3 Alignment ........................................................................................................................................................ 21

B.2.2.4 Bead width ...................................................................................................................................................... 21

B.2.3 Electrofusion .................................................................................................................................................. 22

B.2.3.1 Electrofusion socket .................................................................................................................................... 22

B.2.3.2 Saddle or tapping tee ................................................................................................................................... 23

B.2.4 Ancillary tooling ............................................................................................................................................ 25

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

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European foreword

This document (FprCEN/TS 12007-6:2020) has been prepared by Technical Committee CEN/TC 234

“Gas infrastructure”, the secretariat of which is held by DIN.
This document is currently submitted to the Vote on TS.

The basis if this document has been provided by an Ad Hoc group of interested parties consisting

variously of pipe manufacturers, material suppliers and gas network engineers. The aim is to support

the introduction of Polyamide pipe, PA-U, into Europe for use in natural gas pipe networks operating at

working pressures up to and including 16 bar. The Secretariat of the Ad Hoc group was held by NEN.

This document is part of the following series of standards, which are in the responsibility of

CEN/TC 234 Working Group 2, Secretariat held by BSI:

EN 12007 Gas infrastructure ― Pipelines for maximum operating pressure up to and including 16 bar

consists of the following parts:
— Part 1: General functional requirements

— Part 2: Specific functional requirements for polyethylene (MOP up to and including 10 bar)

— Part 3: Specific functional requirements for steel
— Part 4: Specific functional requirements for renovation

NOTE CEN TC 234/WG 10, Secretariat held by NSAI, is directly responsible for EN 12007-5: Specific

functional recommendations for new service lines.

This document has been written in the style and form of the above functional EN standards, but at this

time has the status only of a CEN TS. This document will be amended under the authority of CEN/TC

234 as soon as more supporting evidence of the safe use of PA-U becomes available.

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1 Scope

This document describes the specific functional requirements for polyamide (PA) pipelines in addition

to the general functional requirements of EN 12007-1 for:
a) a maximum operating pressure (MOP) up to and including 16 bar;
b) an operating temperature between −20 °C and +40 °C.
This document covers one type of pipe:
— PA pipes single layer solid wall.
This document specifies common basic principles for gas infrastructure.

NOTE 1 Users of this document are aware that more detailed national standards and/or code of practice can

exist in the CEN member countries.

This document is intended to be applied in association with these national standards and/or codes of

practice setting out the above-mentioned basic principles.

NOTE 2 In the event of conflicts in terms of more restrictive requirements in national legislation/regulation

with the requirements of this document, the national legislation/regulation takes precedence as illustrated in

CEN/TR 13737 (all parts).
CEN/TR 13737 (all parts) give:
— clarification of all legislations/regulations applicable in a member state;
— if appropriate, more restrictive national requirements;
— a national contact point for the latest information.
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 ISO 16486-1, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-

U) piping systems with fusion jointing and mechanical jointing — Part 1: General

prEN ISO 16486-2, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-

U) piping systems with fusion jointing and mechanical jointing — Part 2: Pipes

prEN ISO 16486-3, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-

U) piping systems with fusion jointing and mechanical jointing — Part 3: Fittings

prEN ISO 16486-4, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-

U) piping systems with fusion jointing and mechanical jointing — Part 4: Valves

prEN ISO 16486-5, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-

U) piping systems with fusion jointing and mechanical jointing — Part 5: Fitness for purpose of the syste

EN 12327, Gas infrastructure - Pressure testing, commissioning and decommissioning procedures -

Functional requirements
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ISO 12176-1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1:

Butt fusion

ISO 12176-2, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 2:

Electrofusion

ISO 17885, with AMD, Plastic Piping Systems — Mechanical fittings for pressure piping systems —

Specifications” for different thermoplastic materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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

— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
nominal outside diameter
specified outside diameter
3.2
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
3.3
standard dimension ratio
SDR

number approximately equal to the quotient of the nominal outside diameter and the nominal wall

thickness
3.4
maximum operating pressure
MOP

maximum pressure at which a system can be operated continuously under normal operating conditions

Note 1 to entry: Normal operating conditions are: no fault in any device or stream.

3.5
maximum incidental pressure
MIP

maximum pressure which a system can experience during a short time limited by the safety devices

This standard is also applicable for PA-U without any changes.
This standard is also applicable for PA-U without any changes.
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3.6
butt fusion joint

method of jointing PA-U pipes and fittings where the two pipe ends are heated and brought together to

be fused without the use of a separate fitting or filler material
3.7
electrofusion joint

method of jointing PA-U pipes, using fittings which have an integrated electric heating element

3.8
squeeze-off
act of squeezing a pipe to prevent the flow of gas
3.9
minimum required strength
MRS

value of the lower confidence limit rounded down to the next lower value of the R10 series when the

lower confidence limit is below 10 MPa, or to the next lower value of the R20 series when the lower

confidence limit is 10 MPa or greater

Note 1 to entry: R10 and R20 series are the Renard number series conforming to ISO 3 and ISO 497.

3.10
lower confidence limit
LCL

quantity, expressed in MPa, which can be considered as a material property, representing the 97,5 %

lower confidence limit of the predicted long term hydrostatic strength for water at 20 °C for 50 years

3.11
critical rapid crack propagation pressure
RCP

pressure level at which a rapid crack propagation (RCP) can occur in a PA-U pipeline, defined at a

reference temperature
Note 1 to entry: Reference temperature is 0 °C.
4 Symbols and abbreviations
PA-U unplasticized polyamide
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5 Design
5.1 General

The PA-U products are covered by CEN/TC 155, Plastics piping systems and ducting systems. Purchasing

products to CEN standards can be part of a quality programme to ensure the safety and integrity of gas

systems over their design life in service.

The selection of materials, SDR series, dimensions and assembling techniques shall be the responsibility

of the pipeline operator.
5.2 Materials and components

PA-U materials and components used shall comply with prEN ISO 16486-1, prEN ISO 16486-2,

prEN ISO 16486-3, prEN ISO 16486-4 and prEN ISO 16486-5.

Other components not covered by future prEN ISO 16486-1, prEN ISO 16486-2, prEN ISO 16486-3,

prEN ISO 16486-4 and prEN ISO 16486-5 shall conform to the relevant European Standards and

International Standards or, in their absence, to national or other established standards and shall be fit

for their purpose.
5.3 Maximum operating pressure
5.3.1 General

The MOP should be selected on the basis of the gas infrastructure operating requirements provided that

the MOP does not exceed 16 bar and the conditions in 5.3.2 and 5.3.3 are satisfied.

5.3.2 Verification of the overall service (design) coefficient

The overall service (design) coefficient C shall be calculated using the formula as given below and in

Figure 1 shall be greater than or equal to 2. This coefficient C takes into consideration service conditions

as well as the properties and components of a pipeline.
20× MRS
C≥ (1)
MOP× SDR−×1 D
( )
All pressures measured in bar.

Derating factor (D ) is a coefficient used in the calculation of MOP which takes into account the

influence of operating temperature.

NOTE Derating factors are listed in Annex A of prEN ISO 16486-6:2012 will be moved to Annex A of

prEN ISO 16486-5 during the ongoing revision.
5.3.3 Verification of the RCP criterion

The ratio of critical RCP pressure to MOP shall be greater than or equal to 1,5 (according to

prEN ISO 16486-2)

The RCP criterion is the critical pressure, is dependent on pipe size and material, and shall be

determined in accordance with prEN ISO 16486-2.
The critical RCP pressure is based on a temperature of 0 °C.

Where pipe temperature decreases below 0 °C the P /MOP ratio should be recalculated in

ROP

accordance with prEN ISO 16486-5 using a value of RCP pressure determined from the minimum

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expected operating temperature of the pipe. The value of MOP should be reduced so as to maintain the

P /MOP ratio at a value greater than or equal to 1,5. See Figure 1.
RCP
Key
P pressure levels
P critical rapid crack propagation pressure
RCP
STP maximum strength test pressure
max
STP minimum strength test pressure
min
MIP maximum incidental pressure
MOP maximum operating pressure
Figure 1 — Pressure conditions in a PA-U-system
System design
20× MRS
MOP≤
C× SDR−×1 D
( )
RCP
MOP≤ (2)
1,5
Pressure testing
20MRS
1,5× MOP≤ STP≤ (3)
SDR− 1
MIP< STP≤ 09, P (4)
RCP
NOTE For RCP conditions see ISO 16486-2 and ISO 16486-5.
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5.4 Assembly techniques
Jointing procedures can vary depending upon the PA-U material and sizes used.
The acceptable jointing methods that shall be used are:
— fusion joints; or
— mechanical joints.

Joints made between new and existing PA-U gas pipework shall be compatible with the materials being

joined.

Components made from PA-U 11 shall be heat fusion jointed only to components made from PA-U 11.

Components made from PA-U 12 shall be heat fusion jointed only to components made from PA-U 12.

Components made from PA-U are not fusion compatible with components made from other polymers.

NOTE Test methods for assuring fusibility are given in ISO 16486-3 and ISO 16486-5.

The fusion jointing techniques for the construction of PA-U pipelines shall be butt fusion and

electrofusion.

Written jointing procedures, authorized by the pipeline operator, shall be available prior to the

construction of a pipeline.
5.5 Material properties for flow stopping by squeeze-off

When squeeze-off techniques are considered, the suitability of pipe for squeeze-off shall be established

in accordance with prEN ISO 16486-2, Annex A, as the described methodology is applicable for PA-U.

NOTE In publication [7] the squeeze-off behaviour of PA-U 12 pipes is shown.
6 Construction
6.1 Storage, handling and transportation

Care shall be taken during the transport, handling and storage of pipes, fittings and other components

to ensure at all stages that their specified properties and conditions, which can be affected by

environmental factors, are preserved and that physical damage and distortions are avoided.

Pipes and fittings shall be inspected and those pipes with surface defects deeper than 10 % of the

nominal wall thickness shall not be used. For pipe areas which are foreseen for jointing the surface shall

be free of damages which would potentially effect the life time of the system.

PA-U pipes and fittings stored outside are subjected to UV degradation when exposed to direct daylight.

PA-U materials are stabilized to give protection for a UV radiation level of 3,5 GJ/m . National bodies

should give recommendations for allowed storage times in their countries. The average radiation level

for one year in European countries are given in Figure 2.
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Figure 2 — Isobaric curves of global radiation in gigajoules per square metre per year in Europe

Pipes shall not be used where it is considered that they have exceeded the maximum UV exposure limit,

unless they have been tested to demonstrate acceptable performance in accordance with existing

standards.

Further guidance on storage, handling and transportation of PA-U pipes and fittings is given in Annex A.

6.2 Jointing
6.2.1 General

Proven competence in PE jointing methods in accordance with national or local standards is the

minimum requirement in combination with a PA specific instruction, considering also the higher safety

demands of high pressure gas piping systems.
NOTE The inclusion of PA-U is also foreseen in prEN 13067:(2019)

Jointing procedures shall be carefully followed to obtain good quality joints. Cleanliness and the

absence of stress are essential for reliable joints.
6.2.2 Fusion jointing

Fusion equipment shall conform to ISO 12176-1 for butt fusion. Procedures on butt fusion jointing are

given in ISO 21307, the fusion jointing parameters for PA-U can be taken from ISO 16486 series.

NOTE 1 For dual low pressure fusion jointing procedure no parameters have been verified.

Fusion equipment shall conform to ISO 12176-2 for electrofusion. Refer to the manufacturer’s

instructions for electrofusion jointing.

NOTE 2 ISO 12176-1 and ISO 12176−2. These standards are applicable to PA-U as well. The same machines can

be used with different settings.
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Consideration shall be given to the use of shielding, end caps or longer heating times when jointing in

adverse weather conditions.

NOTE 3 Harsh environmental conditions (like strong wind, cold temperatures, rain, extreme humidity, high

dust loads, …) or contamination can reduce the quality of the PA fusion joint, when not protected.

Pipes and/or fittings with fusion ends of different SDR values shall not be jointed by butt fusion.

The following are minimum requirements for the assembly of fusion joints:
— cleaning of the pipe and/or fitting ends and the surface of the heated tools;
— protection against dust and other contaminating influenc
...

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