Plastics piping systems for non-pressure underground drainage and sewerage — Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) — Part 2: Pipes and fittings with smooth external surface, Type A

This document, together with ISO 21138-1, specifies the definitions and requirements for pipes with smooth external and internal surfaces (Type A), fittings and systems based on unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) structured-wall piping systems intended to be used in non-pressure underground drainage and sewerage applications. NOTE 1 Pipes, fittings and the system complying with this document can also be used for highway drainage and surface water. This document specifies test methods and test parameters. This document covers a range of pipe and fitting sizes, materials, pipe constructions and nominal ring stiffnesses, and gives recommendations concerning colours. NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and installation practices or codes. In conjunction with ISO 21138-1, this document is applicable to structured-wall pipes and fittings, to their joints and to joints with components of other plastics and non-plastics materials. It is applicable to pipes and fittings with or without an integral socket with elastomeric ring seal joints as well as welded and fused joints. NOTE 3 For dimensions larger than DN/OD 1200, or DN/ID 1200, this document can serve as general guidance regarding appearance, colour, physical and mechanical characteristics as well as performance requirements. Test methods are not included in this document.

Systèmes de canalisations en plastique pour les branchements et les collecteurs d'assainissement sans pression enterrés — Systèmes de canalisations à parois structurées en poly(chlorure de vinyle) non plastifié (PVC-U), polypropylène (PP) et polyéthylène (PE) — Partie 2: Tubes et raccords avec une surface externe lisse, type A

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Published
Publication Date
19-Jan-2020
Current Stage
6060 - International Standard published
Start Date
20-Jan-2020
Completion Date
20-Jan-2020
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ISO 21138-2:2020 - Plastics piping systems for non-pressure underground drainage and sewerage -- Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE)
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INTERNATIONAL ISO
STANDARD 21138-2
Second edition
2020-01
Plastics piping systems for non-
pressure underground drainage and
sewerage — Structured-wall piping
systems of unplasticized poly(vinyl
chloride) (PVC-U), polypropylene (PP)
and polyethylene (PE) —
Part 2:
Pipes and fittings with smooth
external surface, Type A
Systèmes de canalisations en plastique pour les branchements et les
collecteurs d'assainissement sans pression enterrés — Systèmes de
canalisations à parois structurées en poly(chlorure de vinyle) non
plastifié (PVC-U), polypropylène (PP) et polyéthylène (PE) —
Partie 2: Tubes et raccords avec une surface externe lisse, type A
Reference number
ISO 21138-2:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 21138-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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

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

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

below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21138-2:2020(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

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

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

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

3.1 Terms and definitions ....................................................................................................................................................................... 3

3.2 Symbols ......................................................................................................................................................................................................... 4

3.3 Abbreviated terms ............................................................................................................................................................................... 4

4 Material .......................................................................................................................................................................................................................... 5

4.1 General ........................................................................................................................................................................................................... 5

4.2 Unplasticized poly (vinyl chloride) (PVC-U) ................................................................................................................. 5

4.2.1 General...................................................................................................................................................................................... 5

4.2.2 Pipe and fitting material characteristics ..................................................................................................... 5

4.2.3 Utilization of non-virgin materials ................................................................................................................... 5

4.3 Polypropylene (PP) ............................................................................................................................................................................. 6

4.3.1 General...................................................................................................................................................................................... 6

4.3.2 Pipe and fitting material characteristics ..................................................................................................... 6

4.3.3 Melt mass-flow rate classification .................................................................................................................... 7

4.3.4 Utilization of non-virgin materials ................................................................................................................... 7

4.4 Polyethylene (PE) ................................................................................................................................................................................. 7

4.4.1 General...................................................................................................................................................................................... 7

4.4.2 Material characteristics of pipes and injection-moulded fittings .......................................... 7

4.4.3 Material characteristics of rotational-moulded fittings ................................................................. 8

4.4.4 Utilization of non-virgin materials ................................................................................................................... 9

4.5 Sealing ring retaining components ......... ............................................................................................................................... 9

4.6 Sealing rings .............................................................................................................................................................................................. 9

4.7 Fused or welded joints ..................................................................................................................................................................... 9

4.8 Adhesives for PVC-U ........................................................................................................................................................................10

5 Designation of wall construction and examples of typical jointing methods ....................................10

5.1 Wall constructions designated as Type A .....................................................................................................................10

5.1.1 Multilayer construction or hollow-wall construction with axial hollow

sections, Type A1 constructions ......................................................................................................................10

5.1.2 Hollow-wall construction with spirally or radially formed hollow sections,

Type A2 constructions .............................................................................................................................................10

5.1.3 Typical jointing methods for Type A structured-wall pipes ....................................................11

5.2 Designation and design of joints...........................................................................................................................................11

6 General characteristics for pipes and fittings — Colour ..........................................................................................11

7 Geometrical characteristics ...................................................................................................................................................................12

7.1 General ........................................................................................................................................................................................................12

7.2 Dimensions ..............................................................................................................................................................................................12

7.2.1 Designation ........................................................................................................................................................................12

7.2.2 Lengths of pipe ...............................................................................................................................................................12

7.2.3 Diameters of Type A pipes and Type A spigots of pipes or fittings ...................................12

7.2.4 Diameters and jointing dimensions of sockets and spigots.....................................................13

7.2.5 Wall thicknesses ............................................................................................................................................................14

7.3 Types of fitting......................................................................................................................................................................................16

8 Physical characteristics ..............................................................................................................................................................................16

8.1 Unplasticized poly(vinyl chloride) (PVC-U) ................................................................................................................16

8.1.1 Physical characteristics of PVC-U pipes ....................................................................................................16

8.1.2 Physical characteristics of PVC-U fittings ................................................................................................17

8.2 Polypropylene (PP) ..........................................................................................................................................................................18

© ISO 2020 – All rights reserved iii
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ISO 21138-2:2020(E)

8.2.1 Physical characteristics of PP pipes .............................................................................................................18

8.2.2 Physical characteristics of PP fittings .........................................................................................................18

8.3 Polyethylene (PE) ..............................................................................................................................................................................19

8.3.1 Physical characteristics of PE pipes .............................................................................................................19

8.3.2 Physical characteristics of PE fittings .........................................................................................................19

9 Mechanical characteristics .....................................................................................................................................................................20

9.1 Mechanical characteristics of pipes ...................................................................................................................................20

9.1.1 General...................................................................................................................................................................................20

9.1.2 Ring flexibility .................................................................................................................................................................21

9.1.3 Tensile strength of seams (Type A2) ...........................................................................................................21

9.1.4 Additional requirements ........................................................................................................................................21

9.2 Mechanical characteristics of fittings ...............................................................................................................................22

10 Performance requirements ....................................................................................................................................................................22

11 Marking .......................................................................................................................................................................................................................24

11.1 General ........................................................................................................................................................................................................24

11.2 Minimum required marking .....................................................................................................................................................24

11.2.1 Pipes ........................................................................................................................................................................................24

11.2.2 Fittings ...................................................................................................................................................................................24

Annex A (normative) Virgin PVC-U material .............................................................................................................................................26

Annex B (normative) Utilization of non-virgin PVC-U material ............................................................................................27

Annex C (normative) Virgin PP material .......................................................................................................................................................30

Annex D (normative) Utilization of non-virgin PP material .....................................................................................................31

Annex E (normative) Virgin PE material .......................................................................................................................................................34

Annex F (normative) Utilization of non-virgin PE material ......................................................................................................35

Annex G (informative) Survey of possible use of reprocessed and recycled material ...................................38

Bibliography .............................................................................................................................................................................................................................39

iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21138-2:2020(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 1, Plastics pipes and fittings for soil, waste and drainage (including

land drainage).

This second edition cancels and replaces the first edition (ISO 21138:2007), which has been technically

revised. The main changes compared to the previous edition are as follows:
— the normative references have been updated;

— references to EN test methods have been updated to ISO test methods, when applicable;

— editorial improvements have been made for clarification.
A list of all parts in the ISO 21138 series can be found on the ISO website.

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

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 21138-2:2020(E)
Introduction

The ISO 21138 series of standards covers plastics piping systems for non-pressure underground

drainage and sewerage, in particular thermoplastics structured-wall piping systems.

vi © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD ISO 21138-2:2020(E)
Plastics piping systems for non-pressure underground
drainage and sewerage — Structured-wall piping
systems of unplasticized poly(vinyl chloride) (PVC-U),
polypropylene (PP) and polyethylene (PE) —
Part 2:
Pipes and fittings with smooth external surface, Type A
1 Scope

This document, together with ISO 21138-1, specifies the definitions and requirements for pipes with

smooth external and internal surfaces (Type A), fittings and systems based on unplasticized poly(vinyl

chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) structured-wall piping systems intended

to be used in non-pressure underground drainage and sewerage applications.

NOTE 1 Pipes, fittings and the system complying with this document can also be used for highway drainage

and surface water.
This document specifies test methods and test parameters.

This document covers a range of pipe and fitting sizes, materials, pipe constructions and nominal ring

stiffnesses, and gives recommendations concerning colours.

NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these

aspects, taking into account their particular requirements and installation practices or codes.

In conjunction with ISO 21138-1, this document is applicable to structured-wall pipes and fittings, to

their joints and to joints with components of other plastics and non-plastics materials.

It is applicable to pipes and fittings with or without an integral socket with elastomeric ring seal joints

as well as welded and fused joints.

NOTE 3 For dimensions larger than DN/OD 1200, or DN/ID 1200, this document can serve as general guidance

regarding appearance, colour, physical and mechanical characteristics as well as performance requirements.

Test methods are not included in 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 161-1, Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and nominal

pressures — Part 1: Metric series
ISO 178, Plastics — Determination of flexural properties

ISO 306:2013, Plastics — Thermoplastic materials — Determination of Vicat softening temperature (VST)

ISO 527-2:2012, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and

extrusion plastics
© ISO 2020 – All rights reserved 1
---------------------- Page: 7 ----------------------
ISO 21138-2:2020(E)

ISO 580, Plastics piping and ducting systems — Injection-moulded thermoplastics fittings — Methods for

visually assessing the effects of heating

ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)

of thermoplastics — Part 1: Standard method

ISO 1158, Plastics — Vinyl chloride homopolymers and copolymers — Determination of chlorine content

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 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion

method, liquid pycnometer method and titration method

ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters

ISO 2507-1, Thermoplastics pipes and fittings — Vicat softening temperature — Part 1: General test

methodab

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 3126, Plastics piping systems — Plastics components — Determination of dimensions

ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method

ISO 3451-1, Plastics — Determination of ash — Part 1: General methods

ISO 4435:2003, Plastics piping systems for non-pressure underground drainage and sewerage —

Unplasticized poly(vinyl chloride) (PVC-U)

ISO 6259-1, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method

ISO 6259-2, Thermoplastics pipes — Determination of tensile properties — Part 2: Pipes made of

unplasticized poly(vinyl chloride) (PVC-U), chlorinated poly (vinyl chloride) (PVC-C) and high-impact poly

(vinyl chloride) (PVC-HI)

ISO 8772:2006, Plastics piping systems for non-pressure underground drainage and sewerage —

Polyethylene (PE)

ISO 8773:2006, Plastics piping systems for non-pressure underground drainage and sewerage —

Polypropylene (PP)

ISO 9852, Unplasticized poly(vinyl chloride) (PVC-U) pipes — Dichloromethane resistance at specified

temperature (DCMT) — Test method
ISO 9967, Thermoplastics pipes — Determination of creep ratio
ISO 9969, Thermoplastics pipes — Determination of ring stiffness

ISO 11173, Thermoplastics pipes — Determination of resistance to external blows — Staircase method

ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation

induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)

ISO 13229, Thermoplastics piping systems for non-pressure applications — Unplasticized poly(vinyl

chloride) (PVC-U) pipes and fittings — Determination of the viscosity number and K-value

ISO 13254, Thermoplastics piping systems for non-pressure applications — Test method for watertightness

2 © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 21138-2:2020(E)

ISO 13259:2018, Thermoplastics piping systems for underground non-pressure applications — Test method

for leaktightness of elastomeric sealing ring type joints

ISO 13260:2010, Thermoplastics piping systems for non-pressure underground drainage and sewerage —

Test method for resistance to combined temperature cycling and external loading

ISO 13262, Thermoplastics piping systems for non-pressure underground drainage and sewerage —

Thermoplastics spirally-formed structured-wall pipes — Determination of the tensile strength of a seam

ISO 13265, Thermoplastics piping systems for non-pressure underground drainage and sewerage — Joints

for buried non-pressure applications — Test method for the long-term sealing performance of joints with

elastomeric seals by estimating the sealing pressure

ISO 13968, Plastics piping and ducting systems — Thermoplastics pipes — Determination of ring flexibility

ISO 18373-1, Rigid PVC pipes — Differential scanning calorimetry (DSC) method — Part 1: Measurement of

the processing temperature

ISO 21138-1, Plastics piping systems for non-pressure underground drainage and sewerage — Structured-

wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene

(PE) — Part 1: Material specifications and performance criteria for pipes, fittings and the system

ISO 21138-3, Plastics piping systems for non-pressure underground drainage and sewerage — Structured-

wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene

(PE) — Part 3: Pipes and fittings with a non-smooth external surface, Type B

ISO 22088-3, Plastics — Determination of resistance to environmental stress cracking (ESC) — Part 3:

Bent strip method

EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage

applications — Part 1: Vulcanized rubber

EN 681-2, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage

applications — Part 2: Thermoplastic elastomers

EN 681-4, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage

applications — Part 4: Cast polyurethane sealing elements
EN 10204:2004, Metallic products — Types of inspection documents

EN 12099, Plastics piping systems — Polyethylene piping materials and components — Determination of

volatile content

EN 15344, Plastics — Recycled plastics — Characterisation of polyethylene) (PE) recyclates

EN 15345, Plastics — Recycled plastics — Characterisation of polypropylene) (PP) recyclates

EN 15346:2014, Plastics — Recycled plastics — Characterisation of poly(vinyl chloride) (PVC) recyclates

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 21138-1 apply.

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

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
© ISO 2020 – All rights reserved 3
---------------------- Page: 9 ----------------------
ISO 21138-2:2020(E)
3.2 Symbols
A length of engagement, or maximum pull-out whilst maintaining tightness
A minimum value of A
min
C depth of sealing zone
C maximum value of C
max
D inside diameter of a socket
D minimum mean inside diameter of a socket
im, min
d outside diameter (of a pipe or a spigot)
d maximum value of the mean d
em, max e
d minimum value of the mean d
em, min e
d inside diameter of a pipe
d maximum value of the mean d
im, max i
d minimum value of the mean d
im, min i
e wall thickness (at any point)
e construction height
e wall thickness of the socket
e wall thickness of the groove
e wall thickness of the inside layer (waterway wall thickness)
e wall thickness of the inside layer under a hollow section
l effective length of a pipe
3.3 Abbreviated terms
CaCO calcium carbonate
CT close tolerance
DSC differential scanning calorimetry
MgCO magnesium carbonate
MFR melt mass-flow rate
OIT oxidation induction time
TIR true impact rate
TPE thermoplastic elastomer
VST Vicat softening temperature
4 © ISO 2020 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 21138-2:2020(E)
4 Material
4.1 General

The material shall be one of the following: unplasticized poly (vinyl chloride) (PVC-U), polypropylene

(PP) or polyethylene (PE) to which are added those additives that are needed to facilitate the

manufacture of components conforming to this document, including the relevant annexes.

4.2 Unplasticized poly (vinyl chloride) (PVC-U)
4.2.1 General

The raw material shall be PVC-U to which are added those additives that are needed to facilitate the

manufacture of components conforming to the requirements of this document (see also Annex A).

NOTE Additional information on the characteristics of PVC-U material or components made thereof is given

in ISO 21138-1:2020, Annex A.
4.2.2 Pipe and fitting material characteristics

When tested in accordance with the test method specified in Table 1, using the indicated parameters,

the material shall have characteristics conforming to the requirements given in Table 1.

Table 1 — Material characteristics of PVC-U pipes and injection-moulded fittings
Characteristic Requirements Test param
...

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