Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing

ISO 16486-2:2012 specifies the physical and mechanical properties of pipes made from unplasticized polyamide (PA-U) in accordance with ISO 16486-1, intended to be buried and used for the supply of gaseous fuels. It also specifies the test parameters for the test methods to which it refers. ISO 16486 is applicable to PA-U piping systems the components of which are connected by fusion jointing and/or mechanical jointing. In addition, it lays down dimensional characteristics and requirements for the marking of pipes. Pipes conforming to ISO 16486-2:2012 are jointed typically by using mechanical, electrofusion or butt fusion techniques, but not by solvent cement jointing.

Systèmes de canalisations en matières plastiques pour la distribution de combustibles gazeux -- Systèmes de canalisations en polyamide non plastifié (PA-U) avec assemblages par soudage et assemblages mécaniques

General Information

Status
Replaced
Publication Date
03-Jun-2012
Withdrawal Date
03-Jun-2012
Current Stage
9599 - Withdrawal of International Standard
Completion Date
04-Jun-2012
Ref Project

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ISO 16486-2:2012 - Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing
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INTERNATIONAL ISO
STANDARD 16486-2
First edition
2012-06-01
Plastics piping systems for the supply of
gaseous fuels — Unplasticized polyamide
(PA-U) piping systems with fusion
jointing and mechanical jointing —
Part 2:
Pipes
Systèmes de canalisations en matières plastiques pour la
distribution de combustibles gazeux — Systèmes de canalisations
en polyamide non plastifié (PA-U) avec assemblages par soudage et
assemblages mécaniques —
Partie 2: Tubes
Reference number
ISO 16486-2:2012(E)
ISO 2012
---------------------- Page: 1 ----------------------
ISO 16486-2:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012

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 2012 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 16486-2:2012(E)
Contents Page

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

Introduction ........................................................................................................................................................................ v

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

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

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

4 Compound ............................................................................................................................................................. 2

5 Appearance ........................................................................................................................................................... 2

6 Geometrical characteristics ............................................................................................................................. 2

6.1 Measurement of dimensions ............................................................................................................................ 2

6.2 Mean outside diameters, out-of-roundness and their tolerances .......................................................... 2

6.3 Wall thicknesses and tolerances..................................................................................................................... 3

7 Mechanical characteristics ............................................................................................................................... 4

7.1 Conditioning ......................................................................................................................................................... 4

7.2 Requirements ....................................................................................................................................................... 4

8 Physical characteristics .................................................................................................................................... 6

8.1 Conditioning ......................................................................................................................................................... 6

8.2 Requirements ....................................................................................................................................................... 6

9 Marking ................................................................................................................................................................... 6

Annex A (informative) Butt fusion procedure for jointing PA-U pipes ................................................................. 8

Bibliography ..................................................................................................................................................................... 11

© ISO 2012 – All rights reserved iii
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ISO 16486-2:2012(E)
Foreword

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

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

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International

Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

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

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

ISO 16486-2 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 first edition of ISO 16486-2 cancels and replaces the first edition of ISO 22621-2:2007 which has been

technically revised.

ISO 16486 consists of the following parts, under the general title Plastics piping systems for the supply of

gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing:

— Part 1: General
— Part 2: Pipes
— Part 3: Fittings
— Part 5: Fitness for purpose of the system
— Part 6: Code of practice for design, handling and installation
iv © ISO 2012 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 16486-2:2012(E)
Introduction

Thin wall thickness unplasticized polyamide (PA-U) pipes and solvent cement joints are used typically for low

pressures, while thicker wall thickness pipes and butt fusion, electrofusion or mechanical joints are typically

used for high pressures.

For technical and safety reasons, it is not possible to mix the components of the two types of piping system

(thin wall thickness pipes cannot be jointed by butt fusion or mechanical joints and vice versa). In particular,

solvent cement joints must not be used for jointing for high pressure piping systems.

So for the time being, the standardization programme dealing with unplasticized polyamide (PA-U) piping

systems for the supply of gaseous fuels is split into two series of International Standards, with one series

(ISO 17467) covering piping systems the components of which are connected by solvent cement jointing and

the other (ISO 16486) the components of which are connected by fusion jointing and/or mechanical jointing.

When more experience will be gained from the field, it might be reasonable to merge the ISO 17467 series and

the ISO 16486 series in one single series applicable to PA-U piping systems.

A similar series (ISO 17135) for fusion and mechanically jointed plasticized polyamide (PA-P) piping systems

is in preparation.
© ISO 2012 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 16486-2:2012(E)
Plastics piping systems for the supply of gaseous fuels —
Unplasticized polyamide (PA-U) piping systems with fusion
jointing and mechanical jointing —
Part 2:
Pipes
1 Scope

This part of ISO 16486 specifies the physical and mechanical properties of pipes made from unplasticized

polyamide (PA-U) in accordance with ISO 16486-1, intended to be buried and used for the supply of gaseous

fuels. It also specifies the test parameters for the test methods to which it refers.

ISO 16486 is applicable to PA-U piping systems the components of which are connected by fusion jointing

and/or mechanical jointing.

In addition, it lays down dimensional characteristics and requirements for the marking of pipes.

Pipes conforming to this part of ISO 16486 are jointed typically by using mechanical, electrofusion or butt

fusion (see Annex A) techniques, but not by solvent cement jointing.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable

for its application. For dated references, only the edition cited applies. For undated references, the latest edition

of the referenced document (including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 307, Plastics — Polyamides — Determination of viscosity number

ISO 1133-2, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of

thermoplastics — Part 2: Method for materials sensitive to time-temperature history and/or moisture

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

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

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

ISO 6259-3, Thermoplastics pipes — Determination of tensile properties — Part 3: Polyolefin pipes

ISO 11922-1:1997, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:

Metric series

ISO 13477, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack

propagation (RCP) — Small-scale steady-state test (S4 test)
© ISO 2012 – All rights reserved 1
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ISO 16486-2:2012(E)

ISO 13479, Polyolefin pipes for the conveyance of fluids — Determination of resistance to crack propagation —

Test method for slow crack growth on notched pipes

ISO 16486-1:2012, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)

piping systems with fusion jointing and mechanical jointing — Part 1: General
3 Terms, definitions, symbols and abbreviated terms

For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in

ISO 16486-1 apply.
4 Compound
The pipes shall be made from virgin material. Rework material shall not be used.

The compound from which the pipes are made shall be in accordance with ISO 16486-1.

5 Appearance

When viewed without magnification, the internal and external surfaces of pipes shall be smooth, clean and free

from scoring, cavities and other surface defects which can affect pipe performance. The pipe ends shall be cut

cleanly and square to the axis of the pipe.
6 Geometrical characteristics
6.1 Measurement of dimensions

Dimensions shall be measured in accordance with ISO 3126 at (23 ± 2) °C, after being conditioned for at least

4 h. The measurement shall not be made less than 24 h after manufacture.
6.2 Mean outside diameters, out-of-roundness and their tolerances

The mean outside diameter of the pipe, d , and the out-of-roundness and their tolerances shall be in

accordance with Table 1.
For maximum mean outside diameter grade B tolerances, ISO 11922-1 shall apply.
Table 1 — Mean outside diameters and out-of-roundness
Dimensions in millimetres
Nominal outside
Mean outside diameter Maximum of absolute out-of-roundness
diameter
d d d Grade K Grade N
n em,min em,max
16 16,0 16,3 1,2 1,2
20 20,0 20,3 1,2 1,2
25 25,0 25,3 1,5 1,2
32 32,0 32,3 2,0 1,3
40 40,0 40,4 2,4 1,4
50 50,0 50,4 3,0 1,4
63 63,0 63,4 3,8 1,5
75 75,0 75,5 — 1,6
90 90,0 90,6 — 1,8
110 110,0 110,7 — 2,2
125 125,0 125,8 — 2,5
140 140,0 140,9 — 2,8
2 © ISO 2012 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 16486-2:2012(E)
Table 1 (continued)
Nominal outside
Mean outside diameter Maximum of absolute out-of-roundness
diameter
d d d Grade K Grade N
n em,min em,max
160 160,0 161,0 — 3,2
180 180,0 181,1 — 3,6
200 200,0 201,2 — 4,0
225 225,0 226,4 — 4,5
250 250,0 251,5 — 5,0

Measurement of out-of-roundness shall be made at the point of manufacture according to ISO 3126.

For coiled pipe with d ≤ 63 mm, grade K applies; for pipe with d ≥ 75 mm, the maximum out-of roundness shall be specified by

n n
agreement.
6.3 Wall thicknesses and tolerances
6.3.1 Minimum wall thickness

The minimum wall thickness, e , shall be in accordance with Table 2. Small diameter pipes are characterized

min

by wall thickness. Large diameter pipes are characterized by their standard dimension ratio (SDR).

The use of any SDR derived from the pipe series S given according to ISO 4065 and ISO 161-1 is permitted.

NOTE In order to minimize the possibility of damage to small-diameter gas pipes by external influences, the use of

pipes having a wall thickness of not less than 3,0 mm, even if higher than the minimal SDR value, can be considered.

Table 2 — Minimum wall thickness
Dimensions in millimetres
Minimum wall thickness
Nominal outside
diameter
min
SDR 7,4 SDR 9 SDR 11 SDR 13,6 SDR 17 SDR 21 SDR 26
16 2,2 — — — — — —
20 2,8 2,3 — — — — —
25 3,5 2,8 2,3 — — — —
32 4,4 3,6 2,9 2,4 — — —
40 5,5 4,5 3,7 3,0 2,4 2,0 —
50 6,9 5,6 4,6 3,7 3,0 2,4 2,0
63 8,6 7,1 5,8 4,7 3,8 3,0 2,5
75 10,3 8,4 6,8 5,6 4,5 3,6 2,9
90 12,3 10,1 8,2 6,7 5,4 4,3 3,9
110 15,1 12,3 10,0 8,1 6,6 5,3 4,2
125 17,1 14,0 11,4 9,2 7,4 6,0 4,8
140 19,2 15,7 12,7 10,3 8,3 6,7 5,4
160 21,9 17,9 14,6 11,8 9,5 7,7 6,2
180 24,6 20,1 16,4 13,3 10,7 8,6 6,9
200 27,4 22,4 18,2 14,7 11,9 9,6 7,7
225 30,8 25,2 20,5
...

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