ISO/TS 18226:2006
(Main)Plastics pipes and fittings — Reinforced thermoplastics pipe systems for the supply of gaseous fuels for pressures up to 4 MPa (40 bar)
Plastics pipes and fittings — Reinforced thermoplastics pipe systems for the supply of gaseous fuels for pressures up to 4 MPa (40 bar)
ISO/TS 18226:2006 describes the use of reinforced thermoplastics pipe (RTP) systems for transmission of gaseous fuels at maximum operating pressures up to and including 40 bars, and service temperatures in the region - 50 °C to 120 °C, depending on the liner and cover materials. ISO/TS 18226:2006 relates to transmission systems in which wear and damage to the liner are restricted by limiting pigging operations to soft pigging only. The recommendations in ISO/TS 18226:2006 are confined to RTP and its associated in-line fittings and end-fittings. Where the other system components (elbows, tees, valves, etc.) are of conventional construction, they will be governed by existing standards and codes of practice. ISO/TS 18226:2006 specifies a qualification testing procedure for RTP systems. It also provides a procedure for reconfirmation of the design basis that may be used for product variants where changes have been made in design, materials or the manufacturing process.
Tubes et raccords en matières plastiques — Systèmes de canalisations en matière thermoplastique renforcée pour la distribution de combustibles gazeux à des pressions allant jusqu'à 4 MPa (40 bar)
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TECHNICAL ISO/TS
SPECIFICATION 18226
First edition
2006-10-01
Plastics pipes and fittings — Reinforced
thermoplastics pipe systems for the
supply of gaseous fuels for pressures up
to 4 MPa (40 bar)
Tubes et raccords en matières plastiques — Systèmes de canalisations
en matière thermoplastique renforcée pour la distribution de
combustibles gazeux à des pressions allant jusqu'à 4 MPa (40 bar)
Reference number
©
ISO 2006
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.
© ISO 2006
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.
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
Published in Switzerland
ii © ISO 2006 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviations. 2
3.1 General terms and definitions . 2
3.2 Temperature- and pressure-related definitions. 4
3.3 Abbreviations . 5
4 Performance requirements . 6
4.1 Materials . 6
4.2 Pipes and fittings. 7
4.3 Re-qualification . 8
5 Process and quality control. 8
6 Dimensions and marking . 8
6.1 Dimensions. 8
6.2 Marking . 8
7 Handling, storage and installation. 8
Annex A (informative) Description of RTP Products . 9
Annex B (informative) Liner material durability considerations . 12
Annex C (informative) Rationale for the elevated temperature test. 14
Annex D (normative) Test procedures . 17
Annex E (normative) Qualification protocol. 19
Annex F (informative) Process and quality control requirements . 32
Bibliography . 35
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.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of normative document:
⎯ an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
⎯ an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting
a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
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/TS 18226 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 2006 – All rights reserved
Introduction
A reinforced thermoplastics pipe (RTP) comprises a thermoplastics liner with continuous reinforcement and a
thermoplastics outer cover. An RTP “system” comprises runs of RTP, along with the fittings required to
connect them to each other and to the other components of a conventional gas transmission system.
This Technical Specification is applicable for operating pressures up to 4 MPa (40 bar). However it may be
used for guidance in the development of RTP systems for higher operating pressures. It is intended to
accommodate the upgrading of the performance of RTPs and to provide a framework within which future
development can take place.
RTP can be used in both new pipe systems and in the replacement of corroded metallic pipes.
The principal load-bearing components of the RTP are high-strength reinforcing members in the form of fibres,
yarns, tapes or wire, which generally carry load only in tension. The reinforcing element may take the form of
helically-wound yarns or fibre-reinforced tapes, in which the matrix may be a thermoplastics resin.
In the most frequently employed configuration of reinforcement, dry (non-impregnated) aramid-fibre yarns are
encapsulated in a tape of polymer resin or adhesive. It is also possible to employ other classes of
reinforcement, such as glass, carbon or textile fibres, or metallic wire or strip.
The reinforcement may or may not be bonded to the liner or to the outer cover.
Several types of fitting design are possible, with joints made by mechanical means, electrofusion or other
methods of bonding or welding.
TECHNICAL SPECIFICATION ISO/TS 18226:2006(E)
Plastics pipes and fittings — Reinforced thermoplastics pipe
systems for the supply of gaseous fuels for pressures up to
4 MPa (40 bar)
1 Scope
This Technical Specification describes the use of reinforced thermoplastics pipe (RTP) systems for
1)
transmission of gaseous fuels at maximum operating pressures up to and including 4 MPa (40 bar) , and
service temperatures in the region − 50 °C to 120 °C, depending on the liner and cover materials.
This Technical Specification relates to transmission systems in which wear and damage to the liner are
restricted by limiting pigging operations to soft pigging only.
The recommendations in this Technical Specification are confined to RTP and its associated in-line fittings
and end-fittings. Where the other system components (elbows, tees, valves, etc.) are of conventional
construction, they will be governed by existing standards and codes of practice.
This Technical Specification specifies a qualification testing procedure for RTP systems. It also provides a
procedure for reconfirmation of the design basis that may be used for product variants where changes have
been made in design, materials or the manufacturing process.
This Technical Specification provides informative annexes relating to quality assurance, product marking,
handling and storage.
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 4433-1:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification —
Part 1: Immersion test method
ISO 4433-2:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification —
Part 2: Polyolefin pipes
ISO 4433-3:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification —
Part 3: Unplasticized poly(vinyl chloride) (PVC-U), high-impact poly(vinyl chloride) (PVC-HI) and chlorinated
poly (vinyl chloride) (PVC-C) pipes
ISO 4433-4:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification — Part 4: Poly
(vinylidene fluoride) (PVDF) pipes
ISO 4437, Burried polyethylene (PE) pipes for the supply of gaseous fuels — Metric series — Specifications
1) 1 bar = 0,1 MPa = 10 Pa.
ISO 9080:2003, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 12162:1995, Thermoplastics materials for pipes and fittings for pressure applications — Clarification and
designation — Overall service (design) coefficient
ISO 12176-1:1998, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems —
Part 1: Butt fusion
ISO 14531-1, Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance
of gaseous fuels — Metric series — Specifications — Part 1: Pipes
ISO 14531-2, Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance
of gaseous fuels — Metric series — Specifications — Part 2: Fittings for heat-fusion jointing
ISO 14531-3, Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance
of gaseous fuels — Metric series — Specifications — Part 3: Fittings for mechanical jointing (including
PE-X/metal transitions)
ISO 14531-4, Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance
of gaseous fuels — Metric series — Specifications — Part 4: System design and installation guidelines
ASTM D2992-01, Standard Practice for Obtaining Hydrostatic or Pressure Design Basis for “Fiberglass”
(Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Fittings
3 Terms, definitions and abbreviations
For the purpose of this document, the following terms, definitions and abbreviations apply.
3.1 General terms and definitions
3.1.1
aramid
class of high-strength organic fibre “aromatic amide”
2) 2)
EXAMPLES Twaron , Kevlar .
3.1.2
application-related service factor(s)
multiplication factor(s) applied to the manufacturer's nominal pressure rating, to allow for effects such as
cyclicity
3.1.3
ballooning
inflation of the cover of an RTP, by pressurised gas, that has accumulated in the reinforcing layer
3.1.4
blistering
damage in polymer materials caused by the release of absorbed gas on sudden decompression
3.1.5
carbon fibre
class of high-strength graphite-based reinforcing fibre
2) Twaron and Kevlar are examples of suitable prod
...
TECHNICAL ISO/TS
SPECIFICATION 18226
First edition
2006-10-01
Plastics pipes and fittings — Reinforced
thermoplastics pipe systems for the
supply of gaseous fuels for pressures up
to 4 MPa (40 bar)
Tubes et raccords en matières plastiques — Systèmes de canalisations
en matière thermoplastique renforcée pour la distribution de
combustibles gazeux à des pressions allant jusqu'à 4 MPa (40 bar)
Reference number
©
ISO 2006
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.
© ISO 2006
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.
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
Published in Switzerland
ii © ISO 2006 – All rights reserved
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviations. 2
3.1 General terms and definitions . 2
3.2 Temperature- and pressure-related definitions. 4
3.3 Abbreviations . 5
4 Performance requirements . 6
4.1 Materials . 6
4.2 Pipes and fittings. 7
4.3 Re-qualification . 8
5 Process and quality control. 8
6 Dimensions and marking . 8
6.1 Dimensions. 8
6.2 Marking . 8
7 Handling, storage and installation. 8
Annex A (informative) Description of RTP Products . 9
Annex B (informative) Liner material durability considerations . 12
Annex C (informative) Rationale for the elevated temperature test. 14
Annex D (normative) Test procedures . 17
Annex E (normative) Qualification protocol. 19
Annex F (informative) Process and quality control requirements . 32
Bibliography . 35
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.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of normative document:
⎯ an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
⎯ an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting
a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
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/TS 18226 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 2006 – All rights reserved
Introduction
A reinforced thermoplastics pipe (RTP) comprises a thermoplastics liner with continuous reinforcement and a
thermoplastics outer cover. An RTP “system” comprises runs of RTP, along with the fittings required to
connect them to each other and to the other components of a conventional gas transmission system.
This Technical Specification is applicable for operating pressures up to 4 MPa (40 bar). However it may be
used for guidance in the development of RTP systems for higher operating pressures. It is intended to
accommodate the upgrading of the performance of RTPs and to provide a framework within which future
development can take place.
RTP can be used in both new pipe systems and in the replacement of corroded metallic pipes.
The principal load-bearing components of the RTP are high-strength reinforcing members in the form of fibres,
yarns, tapes or wire, which generally carry load only in tension. The reinforcing element may take the form of
helically-wound yarns or fibre-reinforced tapes, in which the matrix may be a thermoplastics resin.
In the most frequently employed configuration of reinforcement, dry (non-impregnated) aramid-fibre yarns are
encapsulated in a tape of polymer resin or adhesive. It is also possible to employ other classes of
reinforcement, such as glass, carbon or textile fibres, or metallic wire or strip.
The reinforcement may or may not be bonded to the liner or to the outer cover.
Several types of fitting design are possible, with joints made by mechanical means, electrofusion or other
methods of bonding or welding.
TECHNICAL SPECIFICATION ISO/TS 18226:2006(E)
Plastics pipes and fittings — Reinforced thermoplastics pipe
systems for the supply of gaseous fuels for pressures up to
4 MPa (40 bar)
1 Scope
This Technical Specification describes the use of reinforced thermoplastics pipe (RTP) systems for
1)
transmission of gaseous fuels at maximum operating pressures up to and including 4 MPa (40 bar) , and
service temperatures in the region − 50 °C to 120 °C, depending on the liner and cover materials.
This Technical Specification relates to transmission systems in which wear and damage to the liner are
restricted by limiting pigging operations to soft pigging only.
The recommendations in this Technical Specification are confined to RTP and its associated in-line fittings
and end-fittings. Where the other system components (elbows, tees, valves, etc.) are of conventional
construction, they will be governed by existing standards and codes of practice.
This Technical Specification specifies a qualification testing procedure for RTP systems. It also provides a
procedure for reconfirmation of the design basis that may be used for product variants where changes have
been made in design, materials or the manufacturing process.
This Technical Specification provides informative annexes relating to quality assurance, product marking,
handling and storage.
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 4433-1:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification —
Part 1: Immersion test method
ISO 4433-2:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification —
Part 2: Polyolefin pipes
ISO 4433-3:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification —
Part 3: Unplasticized poly(vinyl chloride) (PVC-U), high-impact poly(vinyl chloride) (PVC-HI) and chlorinated
poly (vinyl chloride) (PVC-C) pipes
ISO 4433-4:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification — Part 4: Poly
(vinylidene fluoride) (PVDF) pipes
ISO 4437, Burried polyethylene (PE) pipes for the supply of gaseous fuels — Metric series — Specifications
1) 1 bar = 0,1 MPa = 10 Pa.
ISO 9080:2003, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 12162:1995, Thermoplastics materials for pipes and fittings for pressure applications — Clarification and
designation — Overall service (design) coefficient
ISO 12176-1:1998, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems —
Part 1: Butt fusion
ISO 14531-1, Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance
of gaseous fuels — Metric series — Specifications — Part 1: Pipes
ISO 14531-2, Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance
of gaseous fuels — Metric series — Specifications — Part 2: Fittings for heat-fusion jointing
ISO 14531-3, Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance
of gaseous fuels — Metric series — Specifications — Part 3: Fittings for mechanical jointing (including
PE-X/metal transitions)
ISO 14531-4, Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance
of gaseous fuels — Metric series — Specifications — Part 4: System design and installation guidelines
ASTM D2992-01, Standard Practice for Obtaining Hydrostatic or Pressure Design Basis for “Fiberglass”
(Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Fittings
3 Terms, definitions and abbreviations
For the purpose of this document, the following terms, definitions and abbreviations apply.
3.1 General terms and definitions
3.1.1
aramid
class of high-strength organic fibre “aromatic amide”
2) 2)
EXAMPLES Twaron , Kevlar .
3.1.2
application-related service factor(s)
multiplication factor(s) applied to the manufacturer's nominal pressure rating, to allow for effects such as
cyclicity
3.1.3
ballooning
inflation of the cover of an RTP, by pressurised gas, that has accumulated in the reinforcing layer
3.1.4
blistering
damage in polymer materials caused by the release of absorbed gas on sudden decompression
3.1.5
carbon fibre
class of high-strength graphite-based reinforcing fibre
2) Twaron and Kevlar are examples of suitable prod
...
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