SIST EN ISO 13479:1999

SLOVENSKI STANDARD
SIST EN ISO 13479:1999
01-julij-1999
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Polyolefin pipes for the conveyance of fluids - Determination of resistance to crack
propagation - Test method for slow crack growth on notched pipes (notch test) (ISO
13479:1997)
Rohre aus Polyolefinen für den Transport von Fluiden - Bestimmung des Widerstandes
gegen Rißfortpflanzung - Prüfverfahrung für langsames Rißwachstum an gekerbten
Rohren (Kerbprüfung) (ISO 13479:1997)
Tubes en polyoléfines pour le transport des fluides - Résistance a la propagation de la
fissure - Méthode d'essai de la propagation lente de la fissure d'un tube entaillé (essai
d'entaille) (ISO 13479:1997)
Ta slovenski standard je istoveten z: EN ISO 13479:1997
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
SIST EN ISO 13479:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 13479:1999

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SIST EN ISO 13479:1999

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SIST EN ISO 13479:1999

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SIST EN ISO 13479:1999
INTERNATIONAL IS0
STANDARD 13479
First edition
1997-05-01
Polyolefin pipes for the conveyance of
fluids -
Determination of resistance to
crack propagation - Test method for slow
crack growth on notched pipes (notch test)
Tubes en polyokfines pour le transport des fluides - Rkistance ti la
propagation de la fissure - Mgthode d ’essai de la propagation lente de la
fissure d ’un tube entail/k (essai d ’entaille)
Reference number
IS0 13479: 1997(E)

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SIST EN ISO 13479:1999
IS0 13479: 1997(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 13479 was prepared by Technical Committee
ISOnC 138, Plastics pipes, fittings and valves for the transport of fluids,
Subcommittee SC 5, Genera/ properties of pipes, fittings and valves of
plastic materials and their accessories - Test methods and basic
specifications.
Annexes A and B of this International Standard are for information only.
0 IS0 1997
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 the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internet central @ iso.ch
x.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland

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SIST EN ISO 13479:1999
IS0 13479:1997(E)
INTERNATIONAL STANDARD @ IS0
Polyolefin pipes for the conveyance of fluids - Determination of
Test method for slow crack
resistance to crack propagation -
growth on notched pipes (notch test)
1 Scope
This International Standard specifies a method of test 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 standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain
registers of currently valid International Standards.
IS0 161-l :I 996, Thermoplastics pipes for the conveyance of fluids - Nominal outside diameters and nominal
- Par? 1: Metric series.
pressures
Resistance to internal pressure - Test
IS0 1167:1996, Thermoplastics pipes for the conveyance of fluids -
method.
IS0 6108:1978, Double equal angle cutters with plain bore and key drive.
IS0 11922-l :I 997, Thermoplastics pipes for the conveyance of fluids - Dimensions and tolerances - Par? I:
Metric series.
3 Definitions
For the purposes of this International Standard, the definitions given in IS0 161-l and IS0 11922-l apply.
4 Principle
Lengths of pipe with four machined longitudinal external notches are subject to a constant-pressure hydrostatic
pressure test whilst immersed in a water tank at 80 “C. The time to failure is recorded.

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SIST EN ISO 13479:1999
@ IS0
IS0 13479: 1997(E)
5 Apparatus
5.1 Pipe pressure-testing equipment, as specified in IS0 1167.
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 ”~included-angle ‘V-cutter conforming to IS0 6108, having a cutting rate of (0,010 + 0,002) (mm/rev)/tooth
(see example below).
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 prior to its first use for preparation of test pieces. It shall not be used for any other
material or purpose and shall be replaced after 100 m of notching.
EXAMPLE
A cutter with 20 teeth rotating at 700 rpm, traversed at a speed of 150 mm/min, has a cutting rate of
150/(20 x 700) = 0,011 (mm/rev)/tooth.
6 Test piece preparation
6.1 Test pieces
Each test piece shall comprise a length of pipe sufficient to give a minimum free length of pipe of (3dn +, 5) mm
between the end caps, when fitted for pressure testing in accordance with IS0 1167, where dn is the nominal
outside diameter of the pipe. For pipes with a nominal outside diameter greater than 315 mm, a minimum free
length of (34 & 5) mm shall be used where practical; otherwise a minimum free length of greater than or equal to
1 000 mm shall be used.
6.2 Notch location
Positions shall be marked for machining four notches equally spaced around the pipe circumference (see figure 1).
6.3 Machining the notches
6.3.1 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
6.3.2.
6.3.2 Each notch shall be machined by climb millin
...