Polyethylene pipes and fittings for the supply of gaseous fuels — Code of practice for design, handling and installation

This document presents a code of practice dealing with polyethylene (PE) pipes and fittings for buried pipeline systems outside buildings, conforming to the ISO 4437 series, and designed to transport gaseous fuels [as defined in ISO 4437-1, e.g. methane, liquified petroleum gas (LPG), manufactured gas and hydrogen] within the temperature range –20 °C to +40 °C. This document also gives appropriate temperature-related requirements. The code of practice covers mains and service lines whose components are prepared for fusion or mechanical jointing. It also gives instructions for the design, storage, handling, transportation, laying conditions and fusion quality control of PE pipes and fittings as well as subsequent joint testing, backfilling, pipe system testing and commissioning. NOTE For the renovation code of practice, reference is made to the ISO 11299 series and to ISO 11295 for classification and to the ISO 21225 series for further information for trenchless replacement. The minimal requirements for the jointing methods are given in: — Annex A (butt fusion); — Annex B (electrofusion); and — Annex C (mechanical jointing). In some countries the use of heated-tools socket and saddle fusion is permitted; information on heated-tools fusion jointing techniques is given in Annex D. In the case of ground movement or shaking (e.g. earthquakes, etc.) it can be necessary to implement precautions mentioned in this document following guidelines provided by authorities (e.g. Eurocode 8,[7] EN 12007-1:2012, Annex A,[8] etc.), Workers' health and safety issues are outside the scope of this document.

Tubes et raccords en polyéthylène pour le transport de combustibles gazeux — Code de pratique pour la conception, la manutention et l'installation

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Status
Published
Publication Date
21-Jul-2022
Current Stage
6060 - International Standard published
Due Date
17-Oct-2021
Completion Date
22-Jul-2022
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ISO/TS 10839:2022 - Polyethylene pipes and fittings for the supply of gaseous fuels — Code of practice for design, handling and installation Released:22. 07. 2022
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TECHNICAL ISO/TS
SPECIFICATION 10839
Second edition
2022-07
Polyethylene pipes and fittings for
the supply of gaseous fuels — Code
of practice for design, handling and
installation
Tubes et raccords en polyéthylène pour le transport de combustibles
gazeux — Code de pratique pour la conception, la manutention et
l'installation
Reference number
ISO/TS 10839:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO/TS 10839:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
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ISO/TS 10839:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms, definitions and abbreviated terms .............................................................................................................................. 2

3.1 Terms and definitions ...................................................................................................................................................................... 2

3.2 Symbols and abbreviated terms ............................................................................................................................................. 3

4 Design .............................................................................................................................................................................................................................. 4

4.1 General ........................................................................................................................................................................................................... 4

4.2 Material, components and jointing equipment .......................................................................................................... 4

4.3 Maximum operating pressure .................................................................................................................................................. 5

4.4 Assembly techniques......................................................................................................................................................................... 5

4.5 Squeeze-off properties .................................................................................................................................................................... 5

5 Construction ............................................................................................................................................................................................................. 6

5.1 Competences ......... ............................................................. ....................................................................................................................... 6

5.2 Storage, handling and transport ........................................................................................................................................... .. 6

5.2.1 General ........................................................................................................................................................................................ 6

5.2.2 Storage ......................................................................................................................................................................................... 6

5.2.3 Handling ..................................................................................................................................................................................... 7

5.2.4 Transport .................................................................................................................................................................................. 7

5.3 Jointing........................................................................................................................................................................................................... 8

5.4 Laying ............................................................................................................................................................................................................. 8

5.4.1 General ........................................................................................................................................................................................ 8

5.4.2 Trench .......................................................................................................................................................................................... 9

5.4.3 Drag forces ............................................................................................................................................................................... 9

5.4.4 Valves ......................................................................................................................................................................................... 10

5.4.5 Connection to working systems ........................................................................................................................ 10

5.4.6 Backfilling ............................................................................................................................................................................. 10

5.5 Pressure testing and commissioning .............................................................................................................................. 10

6 Quality control ....................................................................................................................................................................................................11

6.1 General ........................................................................................................................................................................................................ 11

6.2 Inspection prior to laying .......................................................................................................................................................... 11

6.3 Inspection during laying ........................................................................................................................................... .................. 11

6.3.1 Laying ........................................................................................................................................................................................ 11

6.3.2 Joint integrity .....................................................................................................................................................................12

Annex A (normative) Butt fusion jointing procedure .....................................................................................................................20

Annex B (normative) Electrofusion jointing ............................................................................................................................................25

Annex C (normative) Mechanical jointing...................................................................................................................................................30

Annex D (informative) Socket fusion and saddle fusion fittings jointing procedures ................................31

Annex E (informative) Derating coefficient for various operating temperatures ...........................................32

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

iii
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ISO/TS 10839:2022(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/

iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for

the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels.

This second edition cancels and replaces the first edition (ISO/TS 10839:2000), which has been

technically revised.
The main changes are as follows:
— the whole document has been redrafted in order to improve its readability;

— clauses referring to the jointing processes have been transformed into normative annexes (see

Annex A, Annex B and Annex C);
— the Scope has been updated to include hydrogen;
— Clause 2 and Clause 3 have been updated;

— various additional updates and corrections have been made throughout the document to reflect the

current state of the art;

— information on socket fusion jointing procedures has been deleted as this is the subject of other

published documents (see Annex D).

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
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TECHNICAL SPECIFICATION ISO/TS 10839:2022(E)
Polyethylene pipes and fittings for the supply of gaseous
fuels — Code of practice for design, handling and
installation
1 Scope

This document presents a code of practice dealing with polyethylene (PE) pipes and fittings for buried

pipeline systems outside buildings, conforming to the ISO 4437 series, and designed to transport

gaseous fuels [as defined in ISO 4437-1, e.g. methane, liquified petroleum gas (LPG), manufactured gas

and hydrogen] within the temperature range –20 °C to +40 °C. This document also gives appropriate

temperature-related requirements.

The code of practice covers mains and service lines whose components are prepared for fusion or

mechanical jointing. It also gives instructions for the design, storage, handling, transportation, laying

conditions and fusion quality control of PE pipes and fittings as well as subsequent joint testing,

backfilling, pipe system testing and commissioning.

NOTE For the renovation code of practice, reference is made to the ISO 11299 series and to ISO 11295 for

classification and to the ISO 21225 series for further information for trenchless replacement.

The minimal requirements for the jointing methods are given in:
— Annex A (butt fusion);
— Annex B (electrofusion); and
— Annex C (mechanical jointing).

In some countries the use of heated-tools socket and saddle fusion is permitted; information on heated-

tools fusion jointing techniques is given in Annex D.

In the case of ground movement or shaking (e.g. earthquakes, etc.) it can be necessary to implement

precautions mentioned in this document following guidelines provided by authorities (e.g. Eurocode

[7] [8]
8, EN 12007-1:2012, Annex A, etc.),
Workers' health and safety issues are outside the scope of this document.
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.

ISO 4437-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General

ISO 4437-2:2014, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2:

Pipes

ISO 4437-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings

ISO 4437-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves

ISO 4437-5, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness

for purpose of the system
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ISO/TS 10839:2022(E)

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 12176-3, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 3:

Operator's badge

ISO 12176-4, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 4:

Traceability coding

ISO 12176-5, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 5:

Two-dimensional data coding of components and data exchange format for PE piping systems

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

ISO 17885:2021, Plastics piping systems — Mechanical fittings for pressure piping systems — Specifications

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

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

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 Terms and definitions
3.1.1
butt fusion machine pressure

pressure indicated on the gauge or on a pressure display on a butt fusion machine, giving an indication

of the interface force applied to the pipe and/or fitting ends
3.1.2
clearance
shortest distance between the outer limits of two objects
3.1.3
drag resistance

frictional resistance due to the weight of the length of pipe fixed in the moveable clamp at the point

at which movement of the moveable clamp is initiated (peak drag), or the friction occurring during

movement (dynamic drag)
3.1.4
electrofusion control unit

equipment implementing the output fusion parameters of voltage or current and time or energy to

execute the fusion cycle as specified by the electrofusion fitting manufacturer
3.1.5
frictional losses in the butt fusion machine

force necessary to overcome friction in the whole mechanism of a butt fusion machine

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ISO/TS 10839:2022(E)
3.1.6
fusion operator

person trained to carry out fusion jointing between polyethylene (PE) pipes and/or fittings

Note 1 to entry: Fusion jointing is based on a written procedure agreed by the pipeline operator

Note 2 to entry: The fusion operator is trained for one or more fusion–jointing procedures

3.1.7
interface force

force between the fusion surfaces of the pipe(s) and/or fitting(s) during the fusion cycle, as specified in

the fusion diagram
3.1.8
operator

person authorized to build polyethylene (PE) systems from pipes and/or fittings, based on a written

procedure agreed by the pipeline operator
3.1.9
overall service (design) coefficient

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

well as properties of the components of a piping system
3.1.10
pipeline operator

private or public organization authorized to design, construct and/or operate and maintain a gas supply

system
3.1.11
soil cover

vertical distance between the top of a buried pipe and the normal surface after finishing work

EXAMPLE Including pavement.
3.2 Symbols and abbreviated terms
A depth
a correct bead root
B bead width
B average bead width
b rejected bead root
C overall service (design) coefficient
D temperature derating coefficient
d external diameter of pipe or spigot fitting
EF electrofusion
e pipe or fitting nominal wall thickness
F maximum drag force (N)
L insertion depth
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ISO/TS 10839:2022(E)
MOP maximum operating pressure
MPa megapascal
MRS minimum required strength
N Newton
p pressure
p critical rapid crack propagation pressure
RCP
RCP rapid crack propagation
SDR standard dimension ratio
SF safety factor
t time
UV ultraviolet
V misalignment
WPS welding procedure specification
σ maximum tensile stress (MPa)
σ tensile stress at yield (MPa)
4 Design
4.1 General

A written laying procedure, authorized by the pipeline operator, shall be made available prior to the

construction of a pipeline. The laying procedure shall include specification of the jointing procedure

(butt fusion, or electrofusion, or mechanical), the pipe and fitting materials to be used, the trenching

and backfilling requirements, the pressure testing and commissioning requirements, and the data to be

collected for the traceability system.

The selection of materials, standard dimension ration (SDR) series, dimensions and assembling

techniques shall be the responsibility of the pipeline operator.

There are two SDR series in common use for gas supply systems: SDR 17 and SDR 11. Other SDR series

can also be used, such as SDR 26 for renovation.

The training and the level of skill of the operator(s) shall be in accordance with the requirements of the

jointing procedures.
General guidelines for supervision and quality control are given in Clause 6.

NOTE Information on the suitability of pipes made from PE100-RC for trenchless technologies is given in

[9]
ISO 4437-1 and EN 1555-1.
4.2 Material, components and jointing equipment

The PE materials and components used shall conform to ISO 4437-1, ISO 4437-2, ISO 4437-3, ISO 4437-4,

ISO 4437-5 and ISO 17885. Other components not covered by the above-mentioned International

Standards shall conform to the relevant national standards or in the absence of such documents,

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ISO/TS 10839:2022(E)

the components shall meet the performance requirements of the system as demonstrated by the

manufacturer.

The fusion equipment used for the construction of the pipeline shall conform to the requirements of

ISO 12176-1 or ISO 12176-2. If the operation of the fusion equipment requires an operator's badge,

the badge shall conform to ISO 12176-3. Traceability of PE materials shall refer to ISO 12176-4 and/or

ISO 12176-5.
4.3 Maximum operating pressure

The maximum operating pressure (MOP) of the system shall be selected by the pipeline operator on

the basis of the gas supply system operating requirements and the materials used. The MOP of a PE

system depends on the type of resin used (the minimum required strength, MRS), the pipe SDR series

and the service conditions, and is limited by the overall service (design) coefficient, C, and the rapid

crack propagation (RCP) criteria.

The overall service (design) coefficient C for thermoplastics materials should be as specified in

ISO 12162. This coefficient is used to calculate the MOP of the pipeline. C shall be greater than or equal to

2 for PE pipeline systems for natural gas. For other gases, a higher C value according to ISO 4437-1:2012,

Annex A, can be defined.
The MOP shall be calculated using Formula (1):
20 × MRS
MOP = (1)
CS ×−DR 1 × D

NOTE The temperature derating coefficient, D , is used in the calculation of the MOP which takes into

account the influence of the operating temperature.

The temperature derating coefficient, D , for various operating temperatures is given in Annex E.

The ratio of the critical RCP pressure, p , to the MOP shall be ≥ 1,5 at the minimum operating

RCP

temperature. The critical RCP pressure, p , is dependent upon temperature, pipe size, SDR and type

RCP

of PE material used. It is defined in accordance with ISO 4437-1 and ISO 4437-2, which specify a test

temperature of 0 °C.

Where the pipe operating temperature decreases below 0 °C, the p /MOP ratio shall be recalculated

RCP

using a p value determined from the minimum expected operating temperature of the pipe. If

RCP

necessary, the value of the MOP shall be reduced so as to maintain the p /MOP ratio at a value ≥ 1,5.

RCP
4.4 Assembly techniques

Jointing procedures may vary depending upon the type of PE material and the pipe size used. Butt

fusion and electrofusion are the preferred jointing methods. For the butt fusion jointing procedure, a

reference to ISO 21307 is useful.

For electrofusion and heated-tools socket fusion processes including the operation of fusion control

units, refer to the manufacturers of these components including the control units.

For fusion joints, evidence of the fusion compatibility between the jointing materials should be given.

A written jointing procedure, authorized by the pipeline operator, shall be available prior to the

construction of a pipeline. The jointing procedure shall include specification of the jointing method, the

fusion parameters, the fusion equipment, the jointing conditions, the level of skill of the fusion operator,

and the quality control methods to be used.
4.5 Squeeze-off properties

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

confirmed in accordance with ISO 4437-2:2014, Annex C.
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ISO/TS 10839:2022(E)
5 Construction
5.1 Competences

Operators shall be competent in the field of the assigned job. Operators shall possess the necessary

skills and required knowledge and the ability to operate with awareness.

NOTE 1 Specific courses provide training for the competencies that can be certified by a third party

organization operating, for example, in accordance with ISO/IEC 17020.

NOTE 2 An example of a specific training course for fusion operators can be found in ISO/TR 19480.

5.2 Storage, handling and transport
5.2.1 General

PE pipes are available in coils, drums or straight lengths. Fittings are normally individually packed.

Mishandling of the pipes and fittings shall be avoided to protect them against gouges, scratches, cuts,

holes, kinks or flattening.
5.2.2 Storage

PE pipes can be stored outside and under UV radiation provided that requirements for the resin as

stated in ISO 4437-1 are met. Coloured pipes (e.g. yellow or orange) can be subject to degradation

if solar UV radiation exceeds values as given in ISO 4437-1:2014, Table 2. The user of this document

should consider information of the pipe manufacturer for allowable UV radiation dose with determined

regional UV radiation level during storage.

NOTE 1 Information on regional levels of UV radiation may be found on web pages of national authorities e.g.

meteorological institutes.

NOTE 2 ISO 4437-1 resistance to weathering is based on a cumulative exposure of 3,5 GJ/m UV radiation level

Coloured pipes which have been stored outdoor uncovered for longer than recommended by the

manufacturer shall only be used if tested in accordance with Table 1.

Table 1 — Minimum tests for evaluating coloured pipes when over-exposed to UV radiation

Test Source and method
Elongation at break (all wall thicknesses) ISO 4437-2:2014, Table 4
Hydrostatic strength (80 °C, 1 000 h) ISO 4437-2:2014, Table 4
Decohesive resistance ISO 4437-5:2014, Table 5

PE fittings and valves can be stored following the manufacturer's recommendation.

Straight pipes shall be stacked on a suitable surface, preferably flat and free from stones or other

projections or sharp objects likely to deform or damage the pipes. Pipes and fittings shall be stored in

such a way as to minimize the possibility of the material being damaged by crushing or piercing.

The distances “x” (Figure 1) between support frames holding packs of pipes together shall be equal in

order to allow the frames to be stacked.

The support frame shall not be nailed together and should be constructed in such a way that the load is

directly supported by the frame and not by the pipes.
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ISO/TS 10839:2022(E)
Key
x distance between supports
1 support frame
Figure 1 — Support frame

The exact height to which straight pipes can be stacked depends on many factors such as material,

size, wall thickness and ambient temperature. Stacking shall avoid distortion of pipes over the limits as

given by the manufacturer during the storage. The manufacturer's stacking recommendations shall be

followed.

PE pipes may be coiled or wound on drums. Coils of large-diameter pipes with d ≥ 110 mm shall be

stored vertically in purpose-built racks or cradles. Where loose straight pipes are stacked in pyramidal

fashion, this shall not exceed a height of 1 m. Fittings shall be stored in their original packaging until

being prepared for use. Contact with aggressive reagents or solvents shall be avoided.

The pipes with the earliest extrusion date should be used first for installation. The fittings with

the earliest manufacturing date should be used first for installation. Guidance from the product

manufacturer should be considered.
5.2.3 Handling

Initial handling of straight pipes shall be made with the pipes as delivered by the manufacturer (e.g.

in their own packaging), thus minimizing damage during this phase. When loading, unloading or

handling, it is preferable to use mechanical equipment to move or stack the packages. The pipes shall

not be dragged or thrown along the ground. If handling equipment is not used, choose techniques which

are not likely to damage the pipes and/or fittings.

Coils of pipe stacked on pallets are easily handled using a forklift truck. Individual coils shall not be

rolled off the edge of a vehicle load platform. Coils shall be slung individually when off-loading with a

crane. Before laying a pipe, ensure that the drum is positioned correctly and that its axle will remain

stable during the unrolling operation. While unrolling, ensure that the pipe is not damaged.

Fittings and valves shall be handled in accordance with manufacturer instructions and left in original

packaging until use.
5.2.4 Transport

When transporting straight pipes, flatbed vehicles shall be used. The bed shall be free from nails and

other protuberances. The pipes shall rest uniformly on the vehicle over their whole length, and shall be

securely held in place during transport.

Coiled pipes shall be transported stacked on a pallet or as individual coils, and be firmly secured to the

vehicle. The height of the top of a drum when loaded on a vehicle shall take into consideration the local

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ISO/TS 10839:2022(E)

regulations on the maximum height and any limitations expected on the route. Drums shall be firmly

secured to the vehicle.

Fittings and valves shall be transported in accordance with manufacturer instructions.

5.3 Jointing
The jointing operation, either mechanical or fusion, shall be performed i
...

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