SIST EN ISO 13479:2022
(Main)Polyolefin pipes for the conveyance of fluids - Determination of resistance to crack propagation - Test method for slow crack growth on notched pipes (ISO 13479:2022)
Polyolefin pipes for the conveyance of fluids - Determination of resistance to crack propagation - Test method for slow crack growth on notched pipes (ISO 13479:2022)
This document specifies a test method for determining the resistance to slow crack growth of polyolefin
pipes, expressed in terms of time to failure in a hydrostatic pressure test on a pipe with machined
longitudinal notches in the outside surface. The test is applicable to pipes of wall thickness greater than
5 mm.
Rohre aus Polyolefinen für den Transport von Fluiden - Bestimmung des Widerstandes gegen Rissfortpflanzung - Prüfverfahren für langsames Risswachstum an gekerbten Rohren (Kerbprüfung) (ISO 13479:2022)
Dieses Dokument legt ein Prüfverfahren zur Bestimmung des Widerstandes gegen langsames Risswachstum von Rohren aus Polyolefinen fest, ausgedrückt als Versagenszeit bei einer Prüfung unter hydrostatischem Druck an einem Rohr mit in die Außenoberfläche eingefrästen Längskerben. Die Prüfung ist anwendbar für Rohre mit einer Wanddicke größer 5 mm.
Tubes en polyoléfines pour le transport des fluides - Détermination de la résistance à la propagation de la fissure - Méthode d’essai de la propagation lente de la fissure d’un tube entaillé (essai d’entaille) (ISO 13479:2022)
Le présent document spécifie une méthode de détermination de la résistance des tubes en polyoléfine à la propagation lente d’une fissure, exprimée en fonction du temps à la rupture, lors d’un essai de pression hydrostatique sur un tube entaillé longitudinalement par usinage sur sa surface extérieure. L’essai est applicable aux tubes ayant une épaisseur de paroi supérieure à 5 mm.
Cevi iz poliolefinov za transport tekočin - Ugotavljanje odpornosti proti širjenju razpoke - Metoda za preskus počasnega širjenja razpoke na zarezani cevi (ISO 13479:2022)
Ta dokument določa preskusno metodo za ugotavljanje odpornosti proti počasnemu širjenju razpok v poliolefinskih ceveh, ki je izražena v času za odpoved pri hidrostatičnem tlačnem preskusu na cevi s strojno izdelanimi vzdolžnimi zarezami na zunanji površini. Preskus se uporablja za cevi z debelino stene nad 5 mm.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 13479:2022
01-september-2022
Nadomešča:
SIST EN ISO 13479:2010
Cevi iz poliolefinov za transport tekočin - Ugotavljanje odpornosti proti širjenju
razpoke - Metoda za preskus počasnega širjenja razpoke na zarezani cevi (ISO
13479:2022)
Polyolefin pipes for the conveyance of fluids - Determination of resistance to crack
propagation - Test method for slow crack growth on notched pipes (ISO 13479:2022)
Rohre aus Polyolefinen für den Transport von Fluiden - Bestimmung des Widerstandes
gegen Rissfortpflanzung - Prüfverfahren für langsames Risswachstum an gekerbten
Rohren (Kerbprüfung) (ISO 13479:2022)
Tubes en polyoléfines pour le transport des fluides - Détermination de la résistance à la
propagation de la fissure - Méthode d’essai de la propagation lente de la fissure d’un
tube entaillé (essai d’entaille) (ISO 13479:2022)
Ta slovenski standard je istoveten z: EN ISO 13479:2022
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
SIST EN ISO 13479:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 13479:2022
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SIST EN ISO 13479:2022
EN ISO 13479
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 23.040.20 Supersedes EN ISO 13479:2009
English Version
Polyolefin pipes for the conveyance of fluids -
Determination of resistance to crack propagation - Test
method for slow crack growth on notched pipes (ISO
13479:2022)
Tubes en polyoléfines pour le transport des fluides - Rohre aus Polyolefinen für den Transport von Fluiden -
Détermination de la résistance à la propagation de la Bestimmung des Widerstandes gegen
fissure - Méthode d'essai de la propagation lente de la Rissfortpflanzung - Prüfverfahren für langsames
fissure d'un tube entaillé (essai d'entaille) (ISO Risswachstum an gekerbten Rohren (Kerbprüfung)
13479:2022) (ISO 13479:2022)
This European Standard was approved by CEN on 19 May 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13479:2022 E
worldwide for CEN national Members.
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SIST EN ISO 13479:2022
EN ISO 13479:2022 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 13479:2022
EN ISO 13479:2022 (E)
European foreword
This document (EN ISO 13479:2022) has been prepared by Technical Committee ISO/TC 138 "Plastics
pipes, fittings and valves for the transport of fluids" in collaboration with Technical Committee CEN/TC
155 “Plastics piping systems and ducting systems” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2022, and conflicting national standards
shall be withdrawn at the latest by December 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 13479:2009.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 13479:2022 has been approved by CEN as EN ISO 13479:2022 without any modification.
3
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SIST EN ISO 13479:2022
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SIST EN ISO 13479:2022
INTERNATIONAL ISO
STANDARD 13479
Third edition
2022-06
Polyolefin pipes for the conveyance of
fluids — Determination of resistance
to crack propagation — Test method
for slow crack growth on notched
pipes
Tubes en polyoléfines pour le transport des fluides — Détermination
de la résistance à la propagation de la fissure — Méthode d'essai de la
propagation lente de la fissure d'un tube entaillé (essai d'entaille)
Reference number
ISO 13479:2022(E)
© ISO 2022
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SIST EN ISO 13479:2022
ISO 13479:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
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 2022 – All rights reserved
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SIST EN ISO 13479:2022
ISO 13479:2022(E)
Contents Page
Foreword .iv
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
3.1 Terms related to geometrical dimensions . 1
3.2 Terms related to machining of notches . 2
4 Symbols and abbreviation .3
4.1 Symbols . 3
4.2 Abbreviated terms . 3
5 Principle .3
6 Apparatus .4
7 Test piece preparation .4
7.1 General . 4
7.2 Test pieces . . 5
7.3 Notch location and measurement of dimensions . 5
7.4 Machining the notches . 5
7.5 Number of test pieces . 7
8 Conditioning .7
9 Procedure .7
9.1 Hydrostatic-pressure testing . 7
9.2 Ligament thickness measurement after testing . 7
10 Test report .8
Annex A (normative) Ligament thicknesses .10
Annex B (informative) Test-pressure levels for polyethylene .13
Annex C (informative) Recommended requirements for polyethylene .14
Annex D (normative) Test procedure for the accelerated notched pipe test (ANPT) for PE
100-RC pipes .15
Annex E (normative) Method of measuring notch radius .18
Bibliography .19
iii
© ISO 2022 – All rights reserved
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SIST EN ISO 13479:2022
ISO 13479:2022(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 5, General properties of pipes, fittings and valves of plastic
materials and their accessories -- Test methods and basic specifications, in collaboration with the
European Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastics piping
systems and ducting systems, in accordance with the Agreement on technical cooperation between ISO
and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 13479:2009), which has been technically
revised.
The main changes are as follows:
— warnings have been added to follow the method of test piece preparation and the test procedure
because of the influence on the result;
— a maximum notch radius has been specified;
— in case of premature failure, alternative test pressures and times for PE 80 and PE 100 have been
added to allow retesting at a lower pressure for a longer time;
— an accelerated method by testing with an external detergent has been added.
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.
iv
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SIST EN ISO 13479:2022
INTERNATIONAL STANDARD ISO 13479:2022(E)
Polyolefin pipes for the conveyance of fluids —
Determination of resistance to crack propagation — Test
method for slow crack growth on notched pipes
1 Scope
This document specifies a test method for determining the resistance to slow crack growth of polyolefin
pipes, expressed in terms of time to failure in a hydrostatic pressure test on a pipe with machined
longitudinal notches in the outside surface. The test is applicable to pipes of wall thickness greater than
5 mm.
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 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 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 11922-1, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:
Metric series
ISO 15510, Stainless steels — Chemical composition
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 161-1 and ISO 11922-1 and the
following apply.
ISO and IEC maintain terminology 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 Terms related to geometrical dimensions
3.1.1
nominal outside diameter
d
n
specified outside diameter assigned to a nominal size DN/OD
Note 1 to entry: Nominal outside diameter is expressed in millimetres.
1
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SIST EN ISO 13479:2022
ISO 13479:2022(E)
3.1.2
mean outside diameter
d
em
value of the measurement of the outer circumference of the pipe or spigot end of a fitting in any cross-
section divided by π (= 3,142), rounded to the next greater 0,1 mm
3.1.3
minimum wall thickness
e
min
minimum value for the wall thickness at any point around the circumference of a component, as
specified
3.1.4
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
3.1.5
pipe series
number for pipe designation
Note 1 to entry: Pipe series values are defined according to ISO 4065.
Note 2 to entry: The relationship between the pipe series, S, and the standard dimension ratio, SDR, is given in
ISO 4065 as follows.
SDR−1
S=
2
3.1.6
ligament thickness
δ
lg
value of the measurement or calculation of the remaining ligament after machining of the notch
3.1.7
notch depth
h
value of the depth of the notch after machining, measured or calculated
3.1.8
notch length
l
n
value of the length of the notch
3.1.9
width of machined surface of notch
b
s
value of the width of the machined surface of the notch
3.2 Terms related to machining of notches
3.2.1
climb milling
milling in which the cutting motion of the tool is in the same direction as the feeding direction of the
component being milled
Note 1 to entry: This is also referred to as ‘down milling’.
2
© ISO 2022 – All rights reserved
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SIST EN ISO 13479:2022
ISO 13479:2022(E)
3.2.2
revolution of the cutter
r
value used as a basis for the cutting rate
4 Symbols and abbreviation
4.1 Symbols
For the purposes of this document, the following symbols apply.
b width of machined surface of the notch
s
d mean outside diameter
em
d nominal outside diameter
n
e wall thickness (at any point) of a pipe
e mean wall thickness
m
e maximum wall thickness (at any point) of a pipe
max
e minimum wall thickness (at any point) of a pipe
min
h notch depth
l notch length
n
p test pressure
r revolution of the cutter
δ ligament thickness
lg
σ hydrostatic stress, in megapascals
4.2 Abbreviated terms
ANPT accelerated notch pipe test
PE polyethylene
RC raised crack resistance
S pipe series
SDR standard dimension ratio
5 Principle
A length of pipe with four machined longitudinal external notches is subject to a hydrostatic pressure
test whilst immersed in a water tank at 80 °C in accordance with ISO 1167-1 and ISO 1167-2. The time to
failure or test period is recorded.
NOTE 1 It is assumed that the following test parameters are set by the standard or specification making
reference to this test method:
a) the number of test pieces, if applicable (see 7.5);
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SIST EN ISO 13479:2022
ISO 13479:2022(E)
b) the test pressure (see 9.1);
c) the test period (see 9.1).
To accelerate the test, the pipe with external machined notches is immersed in a tank containing a
® 1)
detergent, for example Arkopal N100 , in accordance with Annex D.
6 Apparatus
6.1 Pipe pressure-testing equipment, as specified in ISO 1167-1.
NOTE Ideally when testing notched pipes, it is recommended to use a single test station. Furthermore, it
is recommended to use automated shut off equipment for each individual pipe when testing multiple pipes on
a manifold. Otherwise, when a pipe fails, the other pipes are disturbed, and re-pressurizing can accelerate any
crack growth present in the notches.
6.2 Notch machining equipment, for example a milling machine with a horizontal mandrel rigidly
fixed to the bed to enable the pipe to be securely clamped to give a straight test piece.
Alternatively, the pipe to be notched can also be fixed from the outside with suitable clamps to keep it
in a stable position to avoid vibrations during the notching process.
The milling cutter mounted on a horizontal arbor shall be a 60° double equal angle V-cutter with a
pointed tip, having a calculated cutting rate of (0,010 ± 0,002) (mm/r)/tooth (see example).
It is important that the cutting rate is within the specified range, otherwise the results will not be valid.
EXAMPLE A cutter with 20 teeth rotating at 700 r/min, traversed at a speed of 150 mm/min, has a calculated
cutting rate of 150/(20 × 700) = 0,011 (mm/r)/tooth.
Vibration of the cutter or the machine bed can affect the radius formed at the bottom of the notch and
shall be minimized.
The milling cutter shall be carefully protected against damage. The cutter shall be subject to a running-
in treatment amounting to 10 m of notching at the specified cutting rate, prior to its first use for the
preparation of test pieces. It shall not be used for any other material or purpose and shall be replaced
after 500 m of notching.
The cutter shall be checked for damage or wear after not more than 100 m of cutting. The cutter teeth
shall be compared with a new cutter by examination with a microscope using a magnification of 10 to
20 times. If there is any evidence of damage or wear it shall be replaced.
The quality of the cutter and machining process can be checked by carrying out notching of a sample
and visually checking the notch tip radius after cutting the cross-section of the pipe. This shall be done
after installation of a new cutter.
6.3 End caps, type A in accordance with ISO 1167-1.
7 Test piece preparation
7.1 General
Prior to any measurements the test piece shall be conditioned at (23 ± 2) °C for at least 4 h.
1) Arkopal® is an example of a suitable product available commercially. This information is given for the
convenience of users of this document and does not constitute an endorsement by ISO. See Clause D.3, NOTE 2
concerning ongoing research to find alternative stress cracking media to replace nonylphenol ethoxylate types
providing accepted correlation has been developed.
4
© ISO 2022 – All rights reserved
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SIST EN ISO 13479:2022
ISO 13479:2022(E)
7.2 Test pieces
Each test piece shall comprise a length of pipe sufficient to give a minimum free length of pipe of
(3d ± 5) mm between the end caps, when fitted for pressure testing in accordance with ISO 1167-2,
n
where d is the nominal outside diameter of the pipe. For pipes with a nominal outside diameter
n
d > 315 mm, a minimum free length of (3 d ± 5) mm shall be used where practical; otherwise a
n n
minimum free length of ≥ 1 000 mm shall be used.
NOTE It is possible that the use of pipes less than 3 d and notch lengths less than or greater than the nominal
n
outside diameter will affect the results.
7.3 Notch location and measurement of dimensions
Positions shall be marked for machining four notches equally spaced around the pipe circumference
(see Figure 1). Measure the mean outside diameter, d , of the test pipe and the wall thickness of the
em
pipe in the centre of the pipe at each notch position in accordance with ISO 3126.
7.4 Machining the notches
7.4.1 If the wall thickness of the test piece is greater than 50 mm, the material shall be machined with
a slot drill of 15 mm to 20 mm diameter to leave approximately 10 mm to be removed by the V-cutter,
used in accordance with 7.4.2. Machining of notches shall not take place within 24 h of production of the
pipe.
7.4.2 Each notch shall be machined by climb milling (see Figure 2), to such a depth as to produce
a pipe wall ligament thickness of between 0,78 and 0,82 times the minimum wall thickness, e , as
min
specified in ISO 11922-1, for the diameter and pressure series of the pipe as shown in Table A.1. The
ends of each notch shall be aligned circumferentially as shown in Figure 1 and Figure 2. It is important
that the climb milling technique is used, otherwise the results will not be valid.
Vibration of the cutter or machine bed can affect the radius formed at the bottom of the notch and shall
be minimized.
The notch radius shall not be greater than 100 µm when measured in accordance with the method
described in Annex E and shall be checked at regular intervals of not more than 100 m of cutting.
The length of each notch, at full depth, shall be equal to the pipe nominal outside diameter ±1 mm. For
pipes greater than 315 mm in diameter with a free length of pipe of less than (3 d ± 5) mm, the length
n
of each notch, at full depth, shall be equal to the free length minus (500 ± 1) mm, in accordance with 7.2.
NOTE To achieve a remaining ligament within the required tolerance range, it is advisable to aim for a
remaining ligament at the maximum of the tolerance range. This is because the pipe wall can move due to the
release of residual stresses, resulting in a deeper than anticipated notch.
7.4.3 Measure and record the depth of each notch and the ligament thickness, δ by contact
lg,
mechanical measurement or non-contact means.
NOTE An example of a non-contact method is given in Reference [4] of the Bibliography.
5
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SIST EN ISO 13479:2022
ISO 13479:2022(E)
Key
1 end cap
δ ligament thickness: 0,78 to 0,82 times minimum thickness specified by the product standard for the pipe
lg
being tested, in millimetres
Figure 1 — Pipe test piece
Key
1 pipe wall
2 60° double equal angle V-cutter
h notch depth, in millimetres
l notch length (1 × d ) centred on test piece
n n
a
Direction.
Figure 2 — Notching method
6
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SIST EN ISO 13479:2022
ISO 13479:2022(E)
7.5 Number of test pieces
Prepare a minimum of three test pieces, unless specified otherwise in the referring standard or
specification.
8 Conditioning
The test pieces shall be filled with water, immersed in a water tank at 80 °C and allowed to condition for
24 h ± 1 h for wall thickness up to 25 mm and 48 h ± 1 h for greater wall thickness.
9 Procedure
9.1 Hydrostatic-pressure testing
9.1.1 An internal pressure test in accordance with ISO 1167-1 at a test temperature of 80 °C shall
be carried out on the prepared test piece by applying and maintaining the pressure specified by the
referring standard.
9.1.2 Connect the test piece(s) to the pressurizing equipment and bleed off the air. After conditioning
in accordance with Clause 8, progressively and smoothly apply the test pressure, in the shortest time
practicable between 30 s and 1 h, depending upon the size of the test piece and the capability of the
pressurizing equipment.
NOTE Shock loading by rapid increase of pressure can create crack tip blunting that will affect the test
result.
9.1.3 Maintain the pressure until either the test piece ruptures or the time specified by the referring
standard has elapsed, whichever occurs first. Record the time under pressure to the nearest hour. In
the case of failure, record the location of the failure for each test piece.
Table B.1 gives recommended applicable pressure levels for polyethylene pipes, dependent on material
type and pipe series.
9.1.4 If the sample fails prematurely before the specified requirement, a retest can be performed at
a selected lower pressure for a longer time, if permitted by the referring standard. Annex C gives this
information for polyethylene.
9.2 Ligament thickness measurement after testing
Measurement after testing shall be carried out if premature fa
...
SLOVENSKI STANDARD
oSIST prEN ISO 13479:2020
01-oktober-2020
Cevi iz poliolefinov za transport tekočin - Ugotavljanje odpornosti proti širjenju
razpoke - Metoda za preskus počasnega širjenja razpoke na zarezani cevi (ISO/DIS
13479:2020)
Polyolefin pipes for the conveyance of fluids - Determination of resistance to crack
propagation - Test method for slow crack growth on notched pipes (ISO/DIS 13479:2020)
Rohre aus Polyolefinen für den Transport von Fluiden - Bestimmung des Widerstandes
gegen Rissfortpflanzung - Prüfverfahren für langsames Risswachstum an gekerbten
Rohren (Kerbprüfung) (ISO/DIS 13479:2020)
Tubes en polyoléfines pour le transport des fluides - Détermination de la résistance à la
propagation de la fissure - Méthode d’essai de la propagation lente de la fissure d’un
tube entaillé (essai d’entaille) (ISO/DIS 13479:2020)
Ta slovenski standard je istoveten z: prEN ISO 13479
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
oSIST prEN ISO 13479:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 13479:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 13479:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 13479
ISO/TC 138/SC 5 Secretariat: NEN
Voting begins on: Voting terminates on:
2020-08-14 2020-11-06
Polyolefin pipes for the conveyance of fluids —
Determination of resistance to crack propagation — Test
method for slow crack growth on notched pipes
Tubes en polyoléfines pour le transport des fluides — Détermination de la résistance à la propagation de la
fissure — Méthode d'essai de la propagation lente de la fissure d'un tube entaillé (essai d'entaille)
ICS: 23.040.20
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
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ISO/DIS 13479:2020(E)
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
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oSIST prEN ISO 13479:2020
ISO/DIS 13479:2020(E)
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ii © ISO 2020 – All rights reserved
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oSIST prEN ISO 13479:2020
ISO/DIS 13479:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus .2
6 Test piece preparation .2
6.1 General . 2
6.2 Test pieces . 2
6.3 Notch location and measurement of dimensions . 2
6.4 Machining the notches . 3
6.5 Number of test pieces . 4
7 Conditioning . 4
8 Procedure. 4
8.1 Hydrostatic-pressure testing . 4
8.2 Ligament thickness measurement after testing . 5
9 Test report .5
Annex A (normative) Ligament thicknesses . 7
Annex B (informative) Test-pressure levels for polyethylene .10
Annex C (informative) Recommended requirements for polyethylene .11
Annex D (normative) Test procedure for the accelerated Notch Pipe Test (ANPT) .12
Bibliography .15
© ISO 2020 – All rights reserved iii
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oSIST prEN ISO 13479:2020
ISO/DIS 13479:2020(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 on 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 the following URL: www .iso .org/ iso/ foreword .html.
The committee responsible for this document is ISO/138, Plastics pipes, fittings and valves for the
transport of fluids , SC 5, General properties of pipes, fittings and valves of plastic materials and their
accessories -- Test methods and basic specifications.
This third edition cancels and replaces the second edition (ISO 13479:2009), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— warnings have been added to follow the method of test piece preparation and the test procedure
precisely because of the influence on the result
— in case of premature failure alternative test pressures and times for PE 80 and PE 100 have been
added to allow retest at a lower pressure for a longer time.
— an accelerated method by testing with an external detergent has been added.
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oSIST prEN ISO 13479:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 13479:2020(E)
Polyolefin pipes for the conveyance of fluids —
Determination of resistance to crack propagation — Test
method for slow crack growth on notched pipes
1 Scope
This document specifies a test method for determining the resistance to slow crack growth of polyolefin
pipes, expressed in terms of time to failure in a hydrostatic pressure test on a pipe with machined
longitudinal notches in the outside surface. The test is applicable to pipes of wall thickness greater
than 5 mm.
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 1167-1:2006, 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 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 6108, Double equal angle cutters with plain bore and key drive
ISO 11922-1, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:
Metric series
ISO 15510:2014, Stainless steels — Chemical composition
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 161-1 and ISO 11922-1 apply.
4 Principle
A length of pipe with four machined longitudinal external notches is subject to a hydrostatic pressure
test whilst immersed in a water tank at 80 °C in accordance with ISO 1167-1 and ISO 1167-2. The time to
failure or test period is recorded.
NOTE 1 It is assumed that the following test parameters are set by the standard or specification making
reference to this test method:
a) the number of test pieces, if applicable (see 6.5);
b) the test pressure (see 8.1);
c) the test period (see 8.1).
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oSIST prEN ISO 13479:2020
ISO/DIS 13479:2020(E)
NOTE 2 To accelerate the test, the pipe can be immersed in a tank containing a detergent instead of water, for
example Arkopal® N100, see Annex D.
5 Apparatus
5.1 Pipe pressure-testing equipment, as specified in ISO 1167-1.
5.2 Notch-machining equipment, i.e. a milling machine with a horizontal mandrel rigidly fixed to the
bed to enable the pipe to be securely clamped to give a straight test piece.
The mandrel shall support the pipe bore beneath and along the full length of the notch to be machined.
The milling cutter mounted on a horizontal arbor shall be a 60° double equal angle V-cutter, having a
calculated cutting rate of (0,010 ± 0,002) (mm/r)/tooth (see example).
NOTE 1 It is important that the cutting rate is within the specified range, otherwise the results will not be valid.
EXAMPLE A cutter with 20 teeth rotating at 700 r/min, traversed at a speed of 150 mm/min, has a calculated
cutting rate of 150/(20 × 700) = 0,011 (mm/r)/tooth.
NOTE 2 Vibration of the cutter can affect the radius formed at the bottom of the notch and should be
minimised.
The milling cutter shall be carefully protected against damage. The cutter shall be subject to a running-
in treatment amounting to 10 m of notching at the specified cutting rate, prior to its first use for the
preparation of test pieces. It shall not be used for any other material or purpose and shall be replaced
after 500 m of notching.
The cutter shall be checked for damage or wear after each 100 m of cutting. The cutter teeth shall be
compared with a new cutter by examination with a microscope using a magnification of 10 to 20 times.
If there is any evidence of damage or wear it shall be replaced.
The quality of the cutter and machining process can be checked by carrying out notching of a sample
and visually checking the notch tip radius after cutting the cross section of the pipe.
5.3 End caps, type A in accordance with ISO 1167-1.
6 Test piece preparation
6.1 General
Prior to any measurements the test piece shall be conditioned at (23 ± 2) °C for at least 4 h.
6.2 Test pieces
Each test piece shall comprise a length of pipe sufficient to give a minimum free length of pipe of
(3d ± 5) mm between the end caps, when fitted for pressure testing in accordance with ISO 1167-2,
n
where d is the nominal outside diameter of the pipe. For pipes with a nominal outside diameter
n
d > 315 mm, a minimum free length of (3d ± 5) mm shall be used where practicable; otherwise, a
n n
minimum free length of greater than or equal to 1 000 mm shall be used.
6.3 Notch location and measurement of dimensions
Positions shall be marked for machining four notches equally spaced around the pipe circumference
(see Figure 1). Measure the mean outside diameter, d , of the test pipe and the wall thickness of the
em
pipe in the centre of the pipe at each notch position in accordance with ISO 3126.
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oSIST prEN ISO 13479:2020
ISO/DIS 13479:2020(E)
6.4 Machining the notches
6.4.1 If the wall thickness of the test piece is greater than 50 mm, the material shall be machined with a
slot drill of 15 mm to 20 mm diameter to leave approximately 10 mm to be removed by the V-cutter, used
in accordance with 6.4.2. Machining of notches shall not take place within 24 h of production of the pipe.
6.4.2 Each notch shall be machined by climb milling (see Figure 2) to such a depth as to produce a
pipe wall ligament thickness of between 0,78 and 0,82 times the minimum wall thickness, as specified in
ISO 11922-1, for the diameter and pressure series of the pipe as shown in Table A.1, see Note 1. The end
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