ISO 17885:2021
(Main)Plastics piping systems — Mechanical fittings for pressure piping systems — Specifications
Plastics piping systems — Mechanical fittings for pressure piping systems — Specifications
This document specifies the requirements and test methods for mechanical fittings intended to join plastic pressure piping systems including transition fittings to metal pipes for the following: — supply of gaseous fuels (GAS); — supply of water for human consumption (W), including raw water prior to treatment and for the supply of water for general purposes, as well as underground drainage and sewerage under pressure (P); — supply of water for irrigation (I); — industrial applications (IS). This document is applicable only to mechanical fittings with operating-temperature and pressure limits as indicated in the relevant systems standards. NOTE A list of International Standards for plastic pipes for which mechanical fittings can be used can be found in Annex A. Flanges are not covered by this document. Mechanical fittings for hot and cold water systems inside buildings, as well as for district heating applications, are not covered by this document.
Systèmes de canalisations en plastiques — Raccords mécaniques pour les canalisations sous pression — Spécifications
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INTERNATIONAL ISO
STANDARD 17885
Second edition
2021-06
Plastics piping systems — Mechanical
fittings for pressure piping systems —
Specifications
Systèmes de canalisations en plastiques — Raccords mécaniques pour
les canalisations sous pression — Spécifications
Reference number
ISO 17885:2021(E)
©
ISO 2021
---------------------- Page: 1 ----------------------
ISO 17885:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 17885:2021(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 3
3.1 Terms and definitions . 3
3.2 Symbols and abbreviated terms. 5
3.2.1 Materials . 5
3.2.2 Applications . 6
4 Manufacturers' declaration for the field of application . 6
5 Material . 6
5.1 General . 6
5.2 Plastic materials . 7
5.3 Metals . 8
5.4 Elastomers . 9
5.5 Lubricants and/or greases .10
6 General characteristics .10
6.1 Appearance .10
6.2 Colour .10
6.3 Weathering protection .10
6.4 Threads .10
6.5 Transition fittings to metal pipes .10
6.6 Combined fittings .11
6.7 Twisting . .11
7 Geometrical characteristics .11
8 Physical characteristics .11
8.1 Evaluation of the MRS value of the plastic material .11
8.2 Verification of long-term behaviour of the plastic material .11
8.3 Specific material related characteristics of fitting materials .12
8.4 Application-related characteristics .12
8.4.1 Effect on water quality (W) .12
8.4.2 Resistance to gas constituents (GAS) .12
8.4.3 Chemical resistance of fittings for industrial applications (IS) .13
9 Performance requirements .13
9.1 General .13
9.2 Pressure resistance of the fitting body .14
9.2.1 Preparation of test piece .14
9.2.2 Testing of pressure resistance .14
9.3 Fitting assemblies .14
9.3.1 Preparation of test assemblies .14
9.3.2 Test scheme .14
9.3.3 Requirements .16
10 Marking .25
11 Packaging .25
Annex A (informative) List of standards .26
Annex B (normative) Stiffener requirements .27
Annex C (normative) Test pressure of materials and fitting bodies .28
Annex D (normative) Physical characteristics of fitting materials .30
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ISO 17885:2021(E)
Annex E (normative) Resistance to gas constituents .34
Annex F (normative) Test stresses .35
Annex G (normative) Cyclic test procedure .37
Bibliography .38
iv © ISO 2021 – All rights reserved
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ISO 17885:2021(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 17885:2015), which has been technically
revised. It also incorporates the Amendment ISO 17885:2015/Amd 1:2016.
The main changes compared to the previous edition are as follows:
— a clarification for the relation between the nominal pressure and the MOP declared by the
manufacturer is given;
— the term ‘weathering’ is used instead of ‘ultraviolet radiation’, to be in line with PE pipe standards;
— a clarification that the own reprocessable material of glass reinforced materials with a fibre length
up to 3 mm may be used;
— the diameter for various pipe materials for the ‘Resistance of plastic pipe/pipe or pipe/fitting
assemblies to tensile loading at 23 °C has been increased from 63 mm to 250 mm;
— unplasticized polyamide (PA-U) is included in Table 7;
— errors in Table D.1 regarding the viscosity number of unplasticized polyamide (PA-U) are resolved;
— the requirement for the melt mass flow rate for PB in Table D.1 is aligned with ISO 15494;
— the requirement for the depth of dezincification for Cu in Table D.1 is aligned with EN 1254-3, -6 and
-8;
— Formulae (1) and (2) and Annex C are corrected;
— the test pressures for unplasticized polyamide (PA-U) in Table F.1 are increased;
— the test procedure in Annex G is clarified.
© ISO 2021 – All rights reserved v
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ISO 17885:2021(E)
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.
vi © ISO 2021 – All rights reserved
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ISO 17885:2021(E)
Introduction
This document specifies the requirements for mechanical fittings for joining plastic piping systems for
the supply of gaseous fuels, the supply of water for human consumption and other purposes, as well as
for industrial application.
It provides a unified set of test methods to check the performance of the fittings, depending on their
intended use.
It is the responsibility of the purchaser or specifier to select the appropriate fitting, taking into account
their particular requirements and any relevant national guidance or regulations and installation
practices or codes.
© ISO 2021 – All rights reserved vii
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INTERNATIONAL STANDARD ISO 17885:2021(E)
Plastics piping systems — Mechanical fittings for pressure
piping systems — Specifications
1 Scope
This document specifies the requirements and test methods for mechanical fittings intended to join
plastic pressure piping systems including transition fittings to metal pipes for the following:
— supply of gaseous fuels (GAS);
— supply of water for human consumption (W), including raw water prior to treatment and for the
supply of water for general purposes, as well as underground drainage and sewerage under pressure
(P);
— supply of water for irrigation (I);
— industrial applications (IS).
This document is applicable only to mechanical fittings with operating-temperature and pressure
limits as indicated in the relevant systems standards.
NOTE A list of International Standards for plastic pipes for which mechanical fittings can be used can be
found in Annex A.
Flanges are not covered by this document.
Mechanical fittings for hot and cold water systems inside buildings, as well as for district heating
applications, are not covered by 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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 75-2, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 306, Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)
ISO 307, Plastics — Polyamides — Determination of viscosity number
ISO 472, Plastics — Vocabulary
ISO 580:2005, Plastics piping and ducting systems — Injection-moulded thermoplastics fittings — Methods
for visually assessing the effects of heating
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)
of thermoplastics — Part 1: Standard method
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ISO 17885:2021(E)
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 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 2: Preparation of pipe test pieces
ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
ISO 2507-1, Thermoplastics pipes and fittings — Vicat softening temperature — Part 1: General test method
ISO 2507-2, Thermoplastics pipes and fittings — Vicat softening temperature — Part 2: Test conditions for
unplasticized poly(vinyl chloride) (PVC-U) or chlorinated poly(vinyl chloride) (PVC-C) pipes and fittings and
for high impact resistance poly (vinyl chloride) (PVC-HI) pipes
ISO 3451-4, Plastics — Determination of ash — Part 4: Polyamides
ISO 3458, Plastics piping systems — Mechanical joints between fittings and pressure pipes — Test method
for leaktightness under internal pressure
ISO 3459, Plastic piping systems — Mechanical joints between fittings and pressure pipes — Test method
for leaktightness under negative pressure
ISO 3501, Plastics piping systems — Mechanical joints between fittings and pressure pipes — Test method
for resistance to pull-out under constant longitudinal force
ISO 3503, Plastics piping systems — Mechanical joints between fittings and pressure pipes — Test method
for leaktightness under internal pressure of assemblies subjected to bending
ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for
materials
ISO 6509-1, Corrosion of metals and alloys — Determination of dezincification resistance of copper alloys
with zinc — Part 1: Test method
ISO 6957, Copper alloys — Ammonia test for stress corrosion resistance
ISO 6993-1, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous
fuels — Part 1: Pipes for a maximum operating pressure of 1 bar (100 kPa)
ISO 6993-2, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous
fuels — Part 2: Fittings for a maximum operating pressure of 200 mbar (20 kPa)
ISO 6993-3, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous
fuels — Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa)
ISO 7686, Plastics pipes and fittings — Determination of opacity
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 10147, Pipes and fittings made of crosslinked polyethylene (PE-X) — Estimation of the degree of
crosslinking by determination of the gel content
ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications — Classification,
designation and design coefficient
ISO 13783, Plastics piping systems — Unplasticized poly(vinyl chloride) (PVC-U) end-load-bearing double-
socket joints — Test method for leaktightness and strength while subjected to bending and internal pressure
ISO 13844, Plastics piping systems — Elastomeric-sealing-ring-type socket joints for use with plastic
pressure pipes — Test method for leaktightness under negative pressure, angular deflection and deformation
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ISO 17885:2021(E)
ISO 13845, Plastics piping systems — Elastomeric-sealing-ring-type socket joints for use with thermoplastic
pressure pipes — Test method for leaktightness under internal pressure and with angular deflection
ISO 13951, Plastics piping systems — Test method for the resistance of plastic pipe/pipe or pipe/fitting
assemblies to tensile loading
ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous
fuels and hydrocarbon fluids
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 17778, Plastics piping systems — Fittings, valves and ancillaries — Determination of gaseous flow
rate/pressure drop relationships
ISO 19899, Plastics piping systems — Polyolefin pipes and mechanical fitting assemblies — Test method for
the resistance to end load (AREL test)
ISO 23711, Elastomeric seals — Requirements for materials for pipe joint seals used in water and drainage
applications — Thermoplastic elastomers
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472, ISO 1043-1, and the
following 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 https:// www .electropedia .org/
3.1.1
mechanical fitting
fitting for assembling plastics pipes with each other or with a metal pipe or fitting, that includes one or
more compression zones to provide pressure integrity, leak tightness and resistance to end loads
3.1.2
full-end-load resistance
combination of component and joint design and characteristics such that under any load condition the
plastic pipe will fail first
3.1.3
end-load resistance
resistance to end load transmitted via the connecting pipe and generated by internal pressure, pipeline
external interference, and thermally induced pipe stresses in any combination
3.1.4
non-end-load resistance
lack of resistance to axial loads without additional external mechanical axial support
3.1.5
lower confidence limit of predicted hydrostatic strength
σ
LPL
quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the
predicted hydrostatic strength at a temperature θ and time t
Note 1 to entry: It is expressed in megapascals.
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ISO 17885:2021(E)
Note 2 to entry: Temperature, θ, is expressed in degrees Celsius and time, t, is expressed in years.
[SOURCE: ISO 12162:2009, 3.2]
3.1.6
minimum required strength
MRS
value of σ (3.1.5) at 20 °C and 50 years, rounded down to the next smaller value of the R10 series
LPL
when σ is below 10 MPa, or to the next lower value of the R20 series when σ is 10 MPa or greater
LPL LPL
Note 1 to entry: The R10 series conforms to ISO 3 and the R20 series conforms to ISO 497.
[SOURCE: ISO 4437-1:2014, 3.3.2]
3.1.7
design coefficient
C
coefficient with a value greater than 1, which takes into consideration service conditions, as well as
properties of the components of a piping system other than those represented in the lower confidence
limit
Note 1 to entry: The minimum value of C, C , is defined and given for various thermoplastics pipe systems in
min
ISO 12162 and Annex C.
[SOURCE: ISO 12162:2009, 3.5, modified — The original notes 1 and 2 to entry have been replaced by a
new note 1 to entry.]
3.1.8
gaseous fuel
fuel which is in the gaseous state at a temperature of 15 °C and a pressure of 1 bar
5 2
Note 1 to entry: 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
[SOURCE: ISO 4437-1:2014, 3.4.1, modified — Note 1 to entry has been added.]
3.1.9
standard dimension ratio
SDR
numerical designation of a pipe series, which is a convenient round number, approximately equal to the
dimension ratio of the nominal outside diameter, d , and the nominal wall thickness, e
n n
[SOURCE: ISO 4437-1:2014, 3.1.15]
3.1.10
nominal pressure
PN
numerical designation, which is a convenient rounded number for reference purposes
Note 1 to entry: For plastic piping systems conveying water, it corresponds to the maximum continuous operating
pressure, expressed in bar, which can be sustained with water at 20 °C, based on the minimum design
coefficient (3.1.7).
3.1.11
virgin material
material in a form such as granules or powder that has not been subjected to use or processing other
than that required for its manufacture and to which no reprocessable or recyclable materials have been
added
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ISO 17885:2021(E)
3.1.12
own reprocessable material
material, of the same grade, prepared from clean rejected unused components, that will be reprocessed
in a manufacturer’s plant after having been previously processed by the same manufacturer in the
production of same components by, for example, injection moulding
3.1.13
recycled material
material comprising one of the following:
a) material from used pipes or fittings which have been cleaned and crushed or ground
b) material from used thermoplastic products other than pipes or fittings which have been cleaned
and crushed or ground
3.2 Symbols and abbreviated terms
3.2.1 Materials
3.2.1.1 Plastics
ABS acrylonitrile-butadiene-styrene
ECTFE ethylene chlorotriflourethylene
PA-U unplasticized polyamide
PB polybutene
PE polyethylene
PE-RT polyethylene of raised temperature resistance
PE-X crosslinked polyethylene
POM polyoxymethylene, polyformaldehyde
PP-B polypropylene block-copolymer
PP-H polypropylene homopolymer
PP-R polypropylene random-copolymer
PP-RCT polypropylene random-copolymer with modified crystallinity
PPSU poly(phenylene sulfone)
PSU polysulfone
PVC-C chlorinated poly(vinyl chloride)
PVC-HI high-impact poly(vinyl chloride)
PVC-O oriented unplasticized poly(vinyl chloride)
PVC-U unplasticized poly(vinyl chloride)
PVDF poly(vinylidene fluoride)
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ISO 17885:2021(E)
3.2.1.2 Metals
Al aluminium
Cu copper
Cu-DHP phosphorus deoxidized copper
Cu-OF oxygen-free copper
Fe iron
Pb lead
Sn tin
Zn zinc
3.2.1.3 Other
As arsenic
C carbon
GF glass fibre
3.2.2 Applications
GAS supply of gaseous fuels
W supply of water for human consumption, including raw water prior to treatment and for the
supply of water for general purpose
P supply of underground drainage and sewerage under pressure
I supply of water for irrigation
IS industrial applications
NOTE Symbols taken from CEN/TR 15438.
4 Manufacturers' declaration for the field of application
The manufacturer shall declare, depending on the intended use, the medium supplied, the nominal
pressure (PN), the pipe material(s) to be jointed, the use of a stiffener, the end load resistance class, the
corrosion resistance, ash content for glass reinforced materials, installation and operating temperature
limits, as applicable, of the mechanical fittings. This declaration shall be included in the product's
technical file.
For GAS applications, the nominal pressure is determined by the MOP declared by the manufacturer,
multiplied by 1,6.
5 Material
5.1 General
Mechanical fittings can be made entirely from plastic materials, from metals, or a combination of plastic
materials and metals.
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ISO 17885:2021(E)
5.2 Plastic materials
The compound/formulation used to manufacture any plastic components of the fitting exposed to
weathering during storage and handling shall be weathering resistant. For longer use and operation,
the component shall be protected.
Pressure-bearing components shall be produced from virgin material, own reprocessable material or a
combination of virgin and own reprocessable material. Recycled m
...
INTERNATIONAL ISO
STANDARD 17885
Second edition
Plastics piping systems — Mechanical
fittings for pressure piping systems —
Specifications
Systèmes de canalisations en plastiques — Raccords mécaniques pour
les canalisations sous pression — Spécifications
PROOF/ÉPREUVE
Reference number
ISO 17885:2021(E)
©
ISO 2021
---------------------- Page: 1 ----------------------
ISO 17885:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 17885:2021(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 3
3.1 Terms and definitions . 3
3.2 Symbols and abbreviated terms. 5
3.2.1 Materials . 5
3.2.2 Applications . 6
4 Manufacturers' declaration for the field of application . 6
5 Material . 6
5.1 General . 6
5.2 Plastic materials . 7
5.3 Metals . 8
5.4 Elastomers . 9
5.5 Lubricants and/or greases .10
6 General characteristics .10
6.1 Appearance .10
6.2 Colour .10
6.3 Weathering protection .10
6.4 Threads .10
6.5 Transition fittings to metal pipes .10
6.6 Combined fittings .11
6.7 Twisting . .11
7 Geometrical characteristics .11
8 Physical characteristics .11
8.1 Evaluation of the MRS value of the plastic material .11
8.2 Verification of long-term behaviour of the plastic material .11
8.3 Specific material related characteristics of fitting materials .12
8.4 Application-related characteristics .12
8.4.1 Effect on water quality (W) .12
8.4.2 Resistance to gas constituents (GAS) .12
8.4.3 Chemical resistance of fittings for industrial applications (IS) .13
9 Performance requirements .13
9.1 General .13
9.2 Pressure resistance of the fitting body .14
9.2.1 Preparation of test piece .14
9.2.2 Testing of pressure resistance .14
9.3 Fitting assemblies .14
9.3.1 Preparation of test assemblies .14
9.3.2 Test scheme .14
9.3.3 Requirements .16
10 Marking .25
11 Packaging .25
Annex A (informative) List of standards .26
Annex B (normative) Stiffener requirements .27
Annex C (normative) Test pressure of materials and fitting bodies .28
Annex D (normative) Physical characteristics of fitting materials .30
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ISO 17885:2021(E)
Annex E (normative) Resistance to gas constituents .34
Annex F (normative) Test stresses .35
Annex G (normative) Cyclic test procedure .37
Bibliography .38
iv PROOF/ÉPREUVE © ISO 2021 – All rights reserved
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ISO 17885:2021(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 17885:2015), which has been technically
revised. It also incorporates the Amendment ISO 17885:2015/Amd 1:2016.
The main changes compared to the previous edition are as follows:
— a clarification for the relation between the nominal pressure and the MOP declared by the
manufacturer is given;
— the term ‘weathering’ is used instead of ‘ultraviolet radiation’, to be in line with PE pipe standards;
— the own reprocessable material of glass reinforced materials with a fibre length up to 3 mm can be
used;
— the diameter for various pipe materials for the ‘Resistance of plastic pipe/pipe or pipe/fitting
assemblies to tensile loading at 23 °C has been increased from 63 mm to 250 mm;
— unplasticized polyamide (PA-U) is included in Table 7;
— errors in Table D.1 regarding the viscosity number of unplasticized polyamide (PA-U) are resolved;
— the requirement for the melt mass flow rate for PB in Table D.1 is aligned with ISO 15494;
— the requirement for the depth of dezincification for Cu in Table D.1 is aligned with EN 1254-3, -6 and
-8;
— Formulae (1) and (2) and Annex C are corrected;
— the test pressures for unplasticized polyamide (PA-U) in Table F.1 are increased;
— the test procedure in Annex G is clarified.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE v
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ISO 17885:2021(E)
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.
vi PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 17885:2021(E)
Introduction
This document specifies the requirements for mechanical fittings for joining plastic piping systems for
the supply of gaseous fuels, the supply of water for human consumption and other purposes, as well as
for industrial application.
It provides a unified set of test methods to check the performance of the fittings, depending on their
intended use.
It is the responsibility of the purchaser or specifier to select the appropriate fitting, taking into account
their particular requirements and any relevant national guidance or regulations and installation
practices or codes.
© ISO 2021 – All rights reserved PROOF/ÉPREUVE vii
---------------------- Page: 7 ----------------------
INTERNATIONAL STANDARD ISO 17885:2021(E)
Plastics piping systems — Mechanical fittings for pressure
piping systems — Specifications
1 Scope
This document specifies the requirements and test methods for mechanical fittings intended to join
plastic pressure piping systems including transition fittings to metal pipes for the following:
— supply of gaseous fuels (GAS);
— supply of water for human consumption (W), including raw water prior to treatment and for the
supply of water for general purposes, as well as underground drainage and sewerage under pressure
(P);
— supply of water for irrigation (I);
— industrial applications (IS).
This document is applicable only to mechanical fittings with operating-temperature and pressure
limits as indicated in the relevant systems standards.
NOTE A list of International Standard for plastic pipes for which mechanical fittings can be used can be
found in Annex A.
Flanges are not covered by this document.
Mechanical fittings for hot and cold water systems inside buildings, as well as for district heating
applications, are not covered by 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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 75-2, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 306, Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)
ISO 307, Plastics — Polyamides — Determination of viscosity number
ISO 472, Plastics — Vocabulary
ISO 580:2005, Plastics piping and ducting systems — Injection-moulded thermoplastics fittings — Methods
for visually assessing the effects of heating
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)
of thermoplastics — Part 1: Standard method
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ISO 17885:2021(E)
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 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 2: Preparation of pipe test pieces
ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
ISO 2507-1, Thermoplastics pipes and fittings — Vicat softening temperature — Part 1: General test method
ISO 2507-2, Thermoplastics pipes and fittings — Vicat softening temperature — Part 2: Test conditions for
unplasticized poly(vinyl chloride) (PVC-U) or chlorinated poly(vinyl chloride) (PVC-C) pipes and fittings and
for high impact resistance poly (vinyl chloride) (PVC-HI) pipes
ISO 3451-4, Plastics — Determination of ash — Part 4: Polyamides
ISO 3458, Plastics piping systems — Mechanical joints between fittings and pressure pipes — Test method
for leaktightness under internal pressure
ISO 3459, Plastic piping systems — Mechanical joints between fittings and pressure pipes — Test method
for leaktightness under negative pressure
ISO 3501, Plastics piping systems — Mechanical joints between fittings and pressure pipes — Test method
for resistance to pull-out under constant longitudinal force
ISO 3503, Plastics piping systems — Mechanical joints between fittings and pressure pipes — Test method
for leaktightness under internal pressure of assemblies subjected to bending
ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for
materials
ISO 6509, Corrosion of metals and alloys — Determination of dezincification resistance of brass
ISO 6957, Copper alloys — Ammonia test for stress corrosion resistance
ISO 6993-1, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous
fuels — Part 1: Pipes for a maximum operating pressure of 1 bar (100 kPa)
ISO 6993-2, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous
fuels — Part 2: Fittings for a maximum operating pressure of 200 mbar (20 kPa)
ISO 6993-3, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous
fuels — Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa)
ISO 7686, Plastics pipes and fittings — Determination of opacity
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 10147, Pipes and fittings made of crosslinked polyethylene (PE-X) — Estimation of the degree of
crosslinking by determination of the gel content
ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications — Classification,
designation and design coefficient
ISO 13783, Plastics piping systems — Unplasticized poly(vinyl chloride) (PVC-U) end-load-bearing double-
socket joints — Test method for leaktightness and strength while subjected to bending and internal pressure
ISO 13844, Plastics piping systems — Elastomeric-sealing-ring-type socket joints for use with plastic
pressure pipes — Test method for leaktightness under negative pressure, angular deflection and deformation
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ISO 17885:2021(E)
ISO 13845, Plastics piping systems — Elastomeric-sealing-ring-type socket joints for use with thermoplastic
pressure pipes — Test method for leaktightness under internal pressure and with angular deflection
ISO 13951, Plastics piping systems — Test method for the resistance of plastic pipe/pipe or pipe/fitting
assemblies to tensile loading
ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous
fuels and hydrocarbon fluids
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 17778, Plastics piping systems — Fittings, valves and ancillaries — Determination of gaseous flow
rate/pressure drop relationships
ISO 19899, Plastics piping systems — Polyolefin pipes and mechanical fitting assemblies — Test method for
the resistance to end load (AREL test)
ISO 23711, Elastomeric seals — Requirements for materials for pipe joint seals used in water and drainage
applications — Thermoplastic elastomers
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472, ISO 1043-1, and the
following 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 https:// www .electropedia .org/
3.1.1
mechanical fitting
fitting for assembling plastics pipes with each other or with a metal pipe or fitting, that includes one or
more compression zones to provide pressure integrity, leak tightness and resistance to end loads
3.1.2
full-end-load resistance
combination of component and joint design and characteristics such that under any load condition the
plastic pipe will fail first
3.1.3
end-load resistance
resistance to end load transmitted via the connecting pipe and generated by internal pressure, pipeline
external interference, and thermally induced pipe stresses in any combination
3.1.4
non-end-load resistance
lack of resistance to axial loads without additional external mechanical axial support
3.1.5
lower confidence limit of predicted hydrostatic strength
σ
LPL
quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the
predicted hydrostatic strength at a temperature θ and time t
Note 1 to entry: It is expressed in megapascals.
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ISO 17885:2021(E)
Note 2 to entry: Temperature, θ, is expressed in degrees Celsius and time, t, is expressed in years.
[SOURCE: ISO 12162:2009, 3.2]
3.1.6
minimum required strength
MRS
value of σLPL (3.1.5) at 20 °C and 50 years, rounded down to the next smaller value of the R10 series
when σ is below 10 MPa, or to the next lower value of the R20 series when σ is 10 MPa or greater
LPL LPL
Note 1 to entry: The R10 series conforms to ISO 3 and the R20 series conforms to ISO 497.
[SOURCE: ISO 4437-1:2014, 3.3.2]
3.1.7
design coefficient
C
coefficient with a value greater than 1, which takes into consideration service conditions, as well as
properties of the components of a piping system other than those represented in the lower confidence
limit
Note 1 to entry: The minimum value of C, C , is defined and given for various thermoplastics pipe systems in
min
ISO 12162 and Annex C.
[SOURCE: ISO 12162:2009, 3.5, modified — The original notes 1 and 2 to entry have been replaced by a
new note 1 to entry.]
3.1.8
gaseous fuel
fuel which is in the gaseous state at a temperature of 15 °C and a pressure of 1 bar
5 2
Note 1 to entry: 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
[SOURCE: ISO 4437-1:2014, 3.4.1, modified — Note 1 to entry has been added.]
3.1.9
standard dimension ratio
SDR
numerical designation of a pipe series, which is a convenient round number, approximately equal to the
dimension ratio of the nominal outside diameter, d , and the nominal wall thickness, e
n n
[SOURCE: ISO 4437-1:2014, 3.1.15]
3.1.10
nominal pressure
PN
numerical designation, which is a convenient rounded number for reference purposes
Note 1 to entry: For plastic piping systems conveying water, it corresponds to the maximum continuous operating
pressure, expressed in bar, which can be sustained with water at 20 °C, based on the minimum design coefficient
(3.1.7).
3.1.11
virgin material
material in a form such as granules or powder that has not been subjected to use or processing other
than that required for its manufacture and to which no reprocessable or recyclable materials have been
added
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ISO 17885:2021(E)
3.1.12
own reprocessable material
material, of the same grade, prepared from clean rejected unused components, that will be reprocessed
in a manufacturer’s plant after having been previously processed by the same manufacturer in the
production of same components by, for example, injection moulding
3.1.13
recycled material
material comprising one of the following:
a) material from used pipes or fittings which have been cleaned and crushed or ground
b) material from used thermoplastic products other than pipes or fittings which have been cleaned
and crushed or ground
3.2 Symbols and abbreviated terms
3.2.1 Materials
3.2.1.1 Plastics
ABS acrylonitrile-butadiene-styrene
ECTFE ethylene chlorotriflourethylene
PA-U unplasticized polyamide
PB polybutene
PE polyethylene
PE-RT polyethylene of raised temperature resistance
PE-X crosslinked polyethylene
POM polyoxymethylene, polyformaldehyde
PP-B polypropylene block-copolymer
PP-H polypropylene homopolymer
PP-R polypropylene random-copolymer
PP-RCT polypropylene random-copolymer with modified crystallinity
PPSU poly(phenylene sulfone)
PSU polysulfone
PVC-C chlorinated poly(vinyl chloride)
PVC-HI high-impact poly(vinyl chloride)
PVC-O oriented unplasticized poly(vinyl chloride)
PVC-U unplasticized poly(vinyl chloride)
PVDF poly(vinylidene fluoride)
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ISO 17885:2021(E)
3.2.1.2 Metals
Al aluminium
Cu copper
Cu-DHP phosphorus deoxidized copper
Cu-OF oxygen-free copper
Fe iron
Pb lead
Sn tin
Zn zinc
3.2.1.3 Other
As arsenic
C carbon
GF glass fibre
3.2.2 Applications
GAS supply of gaseous fuels
W supply of water for human consumption, including raw water prior to treatment and for the
supply of water for general purpose
P supply of underground drainage and sewerage under pressure
I supply of water for irrigation
IS industrial applications
NOTE Symbols taken from CEN/TR 15438.
4 Manufacturers' declaration for the field of application
The manufacturer shall declare, depending on the intended use, the medium supplied, the nominal
pressure (PN), the pipe material(s) to be jointed, the use of a stiffener, the end load resistance class, the
corrosion resistance, ash content for glass reinforced materials, installation and operating temperature
limits, as applicable, of the mechanical fittings. This declaration shall be included in the product's
technical file.
For GAS applications, the nominal pressure is determined by the MOP declared by the manufacturer,
multiplied by 1,6.
5 Material
5.1 General
Mechanical fittings can be made entirely from plastic materials, from metals, or a combination of plastic
materials and metals.
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ISO 17885:2021(E)
5.2 Plastic materials
The compound/formulation used to manufacture any plastic components of the fitting exposed to
weathering during storage and handling shall be weathering resistant. For longer use and operation,
the component shall be protected.
Pressure-bearing components shall be produced from virgin material, own
...
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