ISO 21307:2009
(Main)Plastics pipes and fittings — Butt fusion jointing procedures for polyethylene (PE) pipes and fittings used in the construction of gas and water distribution systems
Plastics pipes and fittings — Butt fusion jointing procedures for polyethylene (PE) pipes and fittings used in the construction of gas and water distribution systems
ISO 21307:2009 establishes general principles for the process used in the construction and quality assessment of butt fusion joints incorporating fittings (ISO 8085-2) and pipes used in the construction of gas (ISO 4437) and water (ISO 4427) distribution systems, made from PE 80 and PE 100 materials having a melt flow rate at 190 °C/5 g of between 0,3 g/10 min and 1,7 g/10 min, with equipment which complies with ISO 12176-1 and installed in accordance with ISO/TS 10839. Also specified are a number of proven butt fusion jointing procedures for pipes and fittings with a wall thickness up to and including 70 mm, the materials and components used, the fusion jointing procedure and equipment, and the quality assessment of the completed joint.
Tubes et raccords en matières plastiques — Modes opératoires d'assemblage par soudage bout à bout de tubes et raccords en polyéthylène (PE) utilisés pour la construction de systèmes de distribution de gaz et d'eau
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INTERNATIONAL ISO
STANDARD 21307
First edition
2009-01-15
Plastics pipes and fittings — Butt fusion
jointing procedures for polyethylene (PE)
pipes and fittings used in the
construction of gas and water
distribution systems
Tubes et raccords en matières plastiques — Modes opératoires
d'assemblage par soudage bout à bout de tubes et raccords en
polyéthylène (PE) utilisés pour la construction de systèmes de
distribution de gaz et d'eau
Reference number
ISO 21307:2009(E)
©
ISO 2009
---------------------- Page: 1 ----------------------
ISO 21307:2009(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
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COPYRIGHT PROTECTED DOCUMENT
© ISO 2009
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
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Published in Switzerland
ii © ISO 2009 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21307:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Butt fusion jointing process . 3
5 Butt fusion jointing procedures . 5
6 Quality control. 9
Annex A (informative) Examples of single pressure and dual pressure procedures . 11
Bibliography . 13
© ISO 2009 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 21307:2009(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 21307 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.
iv © ISO 2009 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21307:2009(E)
Introduction
With the increasing use of bimodal polyethylene (PE) materials such as PE 80 and PE 100, more and more
PE compounds are appearing on the pipe market accompanied by proposals for butt fusion procedures that
often differ for the same materials. The aim of standardization is to encourage the use of similar procedures
for similar materials. There is a need to examine on a global scale current practice and then establish the best
procedure(s) for the highest quality, most reliable and efficient construction of PE butt fusion systems for gas
and water distribution.
© ISO 2009 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 21307:2009(E)
Plastics pipes and fittings — Butt fusion jointing procedures for
polyethylene (PE) pipes and fittings used in the construction of
gas and water distribution systems
1 Scope
This International Standard establishes general principles regarding the process used in the construction and
quality assessment of butt fusion joints incorporating fittings (ISO 8085-2) and pipes used in the construction
of gas (ISO 4437) and water (ISO 4427) distribution systems, made from PE 80 and PE 100 materials having
a melt flow rate at 190 °C/5 kg of between 0,3 g/10 min and 1,7 g/10 min, with equipment which complies with
ISO 12176-1 and installed in accordance with ISO/TS 10839. Specifically, this International Standard specifies
a number of proven butt fusion jointing procedures for pipes and fittings with a wall thickness up to and
including 70 mm. This International Standard takes into consideration the materials and components used, the
fusion jointing procedure and equipment and the quality assessment of the completed joint. This International
Standard can be applied in conjunction with appropriate national regulations and standards.
NOTE It is important for pipe or fitting and equipment manufacturers to be consulted when undertaking butt fusion
jointing of pipes with wall thickness greater than 70 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-3, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 3: Preparation of components
ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
ISO 4065:1996, Thermoplastics pipes — Universal wall thickness table
ISO 4427 (all parts), Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply
ISO 4437, Buried polyethylene (PE) pipes for the supply of gaseous fuels — Metric series — Specifications
ISO 8085-2, Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels — Metric
series — Specifications — Part 2: Spigot fittings for butt fusion, for socket fusion using heated tools and for
use with electrofusion fittings
ISO/TS 10839, Polyethylene pipes and fittings for the supply of gaseous fuels — Code of practice for design,
handling and installation
ISO 12176-1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1: Butt
fusion
© ISO 2009 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 21307:2009(E)
ISO 13953, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure mode of
test pieces from a butt-fused joint
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
cooling cycle reduced pressure (dual pressure)
reduced pressure, used in the cooling cycle or the dual pressure procedure, after the jointing time has expired
3.2
cooling time in the machine under pressure
time period that the butt fusion joint remains under pressure when still clamped in the machine
3.3
cooling time in the machine without pressure
time period the butt fusion joint remains without pressure when still clamped in the machine and before rough
handling or installation
3.4
drag pressure
gauge pressure required to overcome, on a given machine, the sliding frictional drag force of the machine and
pipe
NOTE This drag pressure must be added to the bead-up, heating and bead roll-over pressures.
3.5
fusion jointing pressure
actual pressure, including drag pressure, exerted on the pipe or fitting ends during jointing
3.6
gauge pressure
actual pressure read by the gauge of the butt fusion jointing machine
3.7
heater plate removal (dwell) time
time taken for the separation of the pipe or fitting ends from the heater plate, removal of the heater plate and
closure of the carriage to bring the molten pipe or fitting ends together
3.8
heater plate temperature
measured temperature on the surface of the heater plate where the pipe or fitting wall cross section makes
contact
3.9
heat soak pressure
pressure required to positively maintain the pipe or fitting in contact with the heater plate
3.10
heat soak time
time that the heater plate is in contact with the pipe or fitting ends at the heat soak pressure
3.11
minimum bead size after heating
minimum value of bead size to be attained after achieving the heat soak time
2 © ISO 2009 – All rights reserved
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ISO 21307:2009(E)
3.12
initial bead-up pressure
pressure exerted on the heater plate by the pipe or fitting ends during the bead-up phase of the jointing cycle,
including drag pressure exerted on the pipe or fitting ends during jointing
3.13
initial bead-up time
time taken to generate a continuous bead, of a specified dimension, around the circumference of the ends of
the pipes or fittings
3.14
initial bead-up size
bead size formed on the pipe or fitting ends during the bead-up phase
NOTE Initial bead-up size is expressed in millimetres.
3.15
fusion jointing time (dual pressure)
time period allotted for bead roll-over before cooling cycle reduced pressure
3.16
nominal wall thickness
e
n
wall thickness tabulated in ISO 4065, corresponding to the minimum wall thickness at any point e
y
NOTE Nominal wall thickness is expressed in millimetres.
3.17
operator
person authorized to build polyethylene (PE) systems from pipes and/or fittings, based on a written procedure
agreed by the pipeline operator
3.18
pipeline operator
private or public organization authorized to design, construct and/or operate and maintain a gas supply
system
4 Butt fusion jointing process
4.1 General
PE pipes for the production of butt fusion joints according to this International Standard shall conform to
ISO 4437 (alternatively ISO 4427). Fittings shall conform to ISO 8085-2.
Butt fusion joints according to this International Standard shall be produced on equipment for fusion jointing
PE systems conforming to ISO 12176-1.
4.2 Principle
The principle of butt fusion jointing is to heat two pipe or fitting ends by means of a heater plate to a
designated temperature, then fuse them together by application of pressure and cool them under pressure for
a designated time.
Butt fusion joints shall be made by qualified operators using butt fusion jointing machines that secure and
precisely align the pipe ends. The training and the level of skill of the operator shall be in accordance with the
requirements of the jointing procedure. 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
© ISO 2009 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 21307:2009(E)
jointing method, the fusion parameters, the fusion equipment, the jointing conditions, the level of skill of the
operator, and the quality control methods to be used. Guidelines for quality control are given in Clause 6.
Key elements of the jointing process shall include:
1) cleaning the pipe or fitting ends, planing unit and heater surfaces;
2) clamping the components to be joined; Pipe support may be needed to ensure proper alignment;
3) planing the pipe or fitting ends;
4) aligning the pipes or fittings;
5) measuring the drag and compensating pressure accordingly;
6) melting the pipe or fitting ends;
7) jointing the pipe or fitting ends;
8) holding the pipe or fitting ends under pressure for the cooling time in the machine;
9) completing the cooling time out of the machine.
In 4.3 to 4.10 these key elements are explained in more detail.
4.3 Cleaning the pipe or fitting ends, planing unit and heater surfaces
Clean the inside and outside of the pipe or fitting to be joined by wiping the joint area with a clean lint-free
cloth. All foreign matter shall be removed.
If the pipe has a protective outer layer, it shall be peeled back far enough so that the pipe can be properly
clamped in the fusion machine, unless the pipe manufacturer has personal specific instructions.
Clean the planing unit and the heater plate surfaces with a clean lint-free cloth.
4.4 Clamping the components
Clamp the components in the butt fusion jointing machine and adjust as necessary to achieve proper
alignment. Pipe support may be needed to achieve proper alignment and reduce drag.
4.5 Planing the pipe or fitting ends
Plane the pipe or fitting ends to establish clean, parallel mating surfaces.
4.6 Aligning the pipes or fittings
Remove any shavings from the pipe or fitting ends. Clean the pipe or fitting ends with an alcohol wipe or dry
cloth only if required by company, state or national standards.
Inspect the pipe or fitting ends for incomplete planing, voids, or other imperfections, and then bring them
together to check for proper alignment. The pipe or fitting ends shall be rounded and aligned to ensure
compliance with ISO/TS 10839.
4.7 Measuring drag pressure
Measure the gauge pressure required to overcome the frictional drag force of the machine and the pipe. This
pressure shall be added to the calculated bead-up and fusion jointing pressures.
4 © ISO 2009 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 21307:2009(E)
4.8 Melting the pipe or fitting ends
The surface of the heater plate that comes into contact with the pipe or fitting ends shall be clean, oil free and
co
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 21307
ISO/TC 138/SC 4
Plastics pipes and fittings — Butt fusion
Secretariat: NEN
jointing procedures for polyethylene (PE)
Voting begins on:
pipes and fittings used in the
2008-09-26
construction of gas and water
Voting terminates on:
distribution systems
2008-11-26
Tubes et raccords en matières plastiques — Modes opératoires
d'assemblage par soudage bout à bout de tubes et raccords en
polyéthylène (PE) utilisés pour la construction de systèmes de
distribution de gaz et d'eau
Please see the administrative notes on page iii
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 SUPPORT-
ING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 21307:2008(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2008
---------------------- Page: 1 ----------------------
ISO/FDIS 21307:2008(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO's
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2008 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 21307:2008(E)
In accordance with the provisions of Council Resolution 15/1993, this document is circulated in the
English language only.
© ISO 2008 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 21307:2008(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Butt fusion jointing process . 3
5 Butt fusion jointing procedures . 5
6 Quality control. 9
Annex A (informative) Examples of single pressure and dual pressure procedures. 11
Bibliography . 13
iv © ISO 2008 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 21307:2008(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 21307 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.
© ISO 2008 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO/FDIS 21307:2008(E)
Introduction
With the increasing use of bimodal polyethylene (PE) materials such as PE 80 and PE 100, more and more
PE compounds are appearing on the pipe market accompanied by proposals for butt fusion procedures that
often differ for the same materials. The aim of standardization is to encourage the use of similar procedures
for similar materials. There is a need to examine on a global scale current practice and then establish the best
procedure(s) for the highest quality, most reliable and efficient construction of PE butt fusion systems for gas
and water distribution.
vi © ISO 2008 – All rights reserved
---------------------- Page: 6 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 21307:2008(E)
Plastics pipes and fittings — Butt fusion jointing procedures for
polyethylene (PE) pipes and fittings used in the construction of
gas and water distribution systems
1 Scope
This International Standard establishes general principles regarding the process used in the construction and
quality assessment of butt fusion joints incorporating fittings (ISO 8085-2) and pipes used in the construction
of gas (ISO 4437) and water (ISO 4427) distribution systems, made from PE 80 and PE 100 materials having
a melt flow rate at 190 °C/5 g of between 0,3 g/10 min and 1,7 g/10 min, with equipment which complies with
ISO 12176-1 and installed in accordance with ISO/TS 10839. Specifically, this International Standard specifies
a number of proven butt fusion jointing procedures for pipes and fittings with a wall thickness up to and
including 70 mm. This International Standard takes into consideration the materials and components used, the
fusion jointing procedure and equipment and the quality assessment of the completed joint.
NOTE It is important for pipe or fitting and equipment manufacturers to be consulted when undertaking butt fusion
jointing of pipes with wall thickness greater than 70 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-3, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 3: Preparation of components
ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
ISO 4065:1996, Thermoplastics pipes — Universal wall thickness table
ISO 4427 (all parts), Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply
ISO 4437, Buried polyethylene (PE) pipes for the supply of gaseous fuels — Metric series — Specifications
ISO 8085-2, Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels — Metric
series — Specifications — Part 2: Spigot fittings for butt fusion, for socket fusion using heated tools and for
use with electrofusion fittings
ISO/TS 10839, Polyethylene pipes and fittings for the supply of gaseous fuels — Code of practice for design,
handling and installation
ISO 12176-1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1: Butt
fusion
© ISO 2008 – All rights reserved 1
---------------------- Page: 7 ----------------------
ISO/FDIS 21307:2008(E)
ISO 13953, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure mode of
test pieces from a butt-fused joint
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
cooling cycle reduced pressure (dual pressure)
reduced pressure, used in the cooling cycle or the dual pressure procedure, after the jointing time has expired
3.2
cooling time in the machine under pressure
time period that the butt fusion joint remains under pressure when still clamped in the machine
3.3
cooling time in the machine without pressure
time period the butt fusion joint remains without pressure when still clamped in the machine and before rough
handling or installation
3.4
drag pressure
gauge pressure required to overcome, on a given machine, the sliding frictional drag force of the machine and
pipe
NOTE This drag pressure must be added to the bead-up, heating and bead roll-over pressures.
3.5
fusion jointing pressure
actual pressure, including drag pressure, exerted on the pipe or fitting ends during jointing
3.6
gauge pressure
actual pressure read by the gauge of the butt fusion jointing machine
3.7
heater plate removal (dwell) time
time taken for the separation of the pipe or fitting ends from the heater plate, removal of the heater plate and
closure of the carriage to bring the molten pipe or fitting ends together
3.8
heater plate temperature
measured temperature on the surface of the heater plate where the pipe or fitting wall cross section makes
contact
3.9
heat soak pressure
pressure required to positively maintain the pipe or fitting in contact with the heater plate
3.10
heat soak time
time that the heater plate is in contact with the pipe or fitting ends at the heat soak pressure
3.11
minimum bead size after heating
minimum value of bead size to be attained following achievement of the heat soak time
2 © ISO 2008 – All rights reserved
---------------------- Page: 8 ----------------------
ISO/FDIS 21307:2008(E)
3.12
initial bead-up pressure
pressure exerted on the heater plate by the pipe or fitting ends during the bead-up phase of the jointing cycle,
including drag pressure exerted on the pipe or fitting ends during jointing
3.13
initial bead-up time
time taken to generate a continuous bead, of a specified dimension, around the circumference of the ends of
the pipes or fittings
3.14
initial bead-up size
bead size formed on the pipe or fitting ends during the bead-up phase
NOTE Initial bead-up size is expressed in millimetres.
3.15
jointing time (dual pressure)
time period allotted for bead roll-over before cooling cycle reduced pressure
3.16
nominal wall thickness
e
n
wall thickness tabulated in ISO 4065, corresponding to the minimum wall thickness at any point e
y
NOTE Nominal wall thickness is expressed in millimetres.
3.17
operator
person authorized to build polyethylene (PE) systems from pipes and/or fittings, based on a written procedure
agreed by the pipeline operator
3.18
pipeline operator
private or public organization authorized to design, construct and/or operate and maintain a gas supply
system
4 Butt fusion jointing process
4.1 General
PE pipes for the production of butt fusion joints according to this International Standard shall conform to
ISO 4437 (alternatively ISO 4427). Fittings shall conform to ISO 8085-2.
Butt fusion joints according to this International Standard shall be produced on equipment for fusion jointing
PE systems conforming to ISO 12176-1.
4.2 Principle
The principle of butt fusion jointing is to heat two pipe or fitting ends by means of a heater plate to a
designated temperature, then fuse them together by application of pressure and cool them under pressure for
a designated time.
Butt fusion joints shall be made by qualified operators using butt fusion jointing machines that secure and
precisely align the pipe ends. The training and the level of skill of the operator shall be in accordance with the
requirements of the jointing procedure. 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
© ISO 2008 – All rights reserved 3
---------------------- Page: 9 ----------------------
ISO/FDIS 21307:2008(E)
jointing method, the fusion parameters, the fusion equipment, the jointing conditions, the level of skill of the
operator, and the quality control methods to be used. Guidelines for quality control are given in Clause 6.
Key elements of the jointing process shall include:
1) cleaning the pipe or fitting ends, planing unit and heater surfaces;
2) clamping the components to be joined; Pipe support may be needed to ensure proper alignment;
3) planing the pipe or fitting ends;
4) aligning the pipes or fittings;
5) measuring the drag and compensating pressure accordingly;
6) melting the pipe or fitting ends;
7) jointing the pipe or fitting ends;
8) holding the pipe or fitting ends under pressure for the cooling time in the machine;
9) completing the cooling time out of the machine.
In 4.3 to 4.10 these key elements are explained in more detail.
4.3 Cleaning the pipe or fitting ends, planing unit and heater surfaces
Clean the inside and outside of the pipe or fitting to be joined by wiping the joint area with a clean lint-free
cloth. All foreign matter shall be removed.
If the pipe has a protective outer layer, it shall be peeled back far enough so that the pipe can be properly
clamped in the fusion machine, unless the pipe manufacturer has personal specific instructions.
Clean the planing unit and the heater plate surfaces with a clean lint-free cloth.
4.4 Clamping the components
Clamp the components in the butt fusion jointing machine and adjust as necessary to achieve proper
alignment. Pipe support may be needed to achieve proper alignment and reduce drag.
4.5 Planing the pipe or fitting ends
Plane the pipe or fitting ends to establish clean, parallel mating surfaces.
4.6 Aligning the pipes or fittings
Remove any shavings from the pipe or fitting ends. Clean the pipe or fitting ends with an alcohol wipe or dry
cloth only if required by company, state or national standards.
Inspect the pipe or fitting ends for incomplete planing, voids, or other imperfections, and then bring them
together to check for proper alignment. The pipe or fitting ends shall be rounded and aligned to ensure
compliance with ISO/TS 10839.
4.7 Measuring drag pressure
Measure the gauge pressure required to overcome the frictional drag force of the m
...
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