EN ISO 13477:2008

SLOVENSKI STANDARD
01-junij-2008
Plastomerne cevi za transport fluidov - Ugotavljanje odpornosti proti hitremu
širjenju razpoke (RCP) - Preskus "Small-scale steady-state" (preskus S4) (ISO
13477:2008)
Thermoplastics pipes for the conveyance of fluids - Determination of resistance to rapid
crack propagation (RCP) - Small-scale steady-state test (S4 test) (ISO 13477:2008)
Rohre aus Thermoplasten für den Transport von Flüssigkeiten - Bestimmung des
Widerstandes gegen schnelle Rissfortpflanzung (RCP) - Laborprüfung (S4 test) (ISO
13477:2008)
Tubes en matieres thermoplastiques pour le transport des fluides - Détermination de la
résistance a la propagation rapide de la fissure (RCP) - Essai a petite échelle (S4) (ISO
13477:2008)
Ta slovenski standard je istoveten z: EN ISO 13477:2008
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 13477
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2008
ICS 23.040.20
English Version
Thermoplastics pipes for the conveyance of fluids -
Determination of resistance to rapid crack propagation (RCP) -
Small-scale steady-state test (S4 test) (ISO 13477:2008)
Tubes en matières thermoplastiques pour le transport des Rohre aus Thermoplasten für den Transport von Fluiden -
fluides - Détermination de la résistance à la propagation Bestimmung des Widerstandes gegenüber schneller
rapide de la fissure (RCP) - Essai à petite échelle à état Rissfortpflanzung (RCP) - Laborprüfung (S4-Prüfung) (ISO
constant (essai S4) (ISO 13477:2008) 13477:2008)
This European Standard was approved by CEN on 7 February 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13477:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 13477:2008) 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 September 2008, and conflicting national standards shall be
withdrawn at the latest by September 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 13477:2008 has been approved by CEN as a EN ISO 13477:2008 without any modification.

INTERNATIONAL ISO
STANDARD 13477
Second edition
2008-03-15
Thermoplastics pipes for the conveyance
of fluids — Determination of resistance
to rapid crack propagation (RCP) —
Small-scale steady-state test (S4 test)
Tubes en matières thermoplastiques pour le transport des fluides —
Détermination de la résistance à la propagation rapide de la fissure
(RCP) — Essai à petite échelle à état constant (essai S4)

Reference number
ISO 13477:2008(E)
©
ISO 2008
ISO 13477:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 13477:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols and abbreviated terms . 1
5 Principle. 2
6 Test parameters . 2
7 Apparatus . 3
7.1 General. 3
7.2 Containment cage. 3
7.3 Gauge length . 3
7.4 Decompression baffles . 4
7.5 Crack-initiation equipment . 4
7.6 End caps . 4
8 Test pieces . 5
9 Conditioning. 5
10 Test procedure . 5
11 Interpretation of results. 5
12 Test report . 6
Annex A (normative) Determination of critical pressure (or hoop stress). 7
Annex B (normative) Determination of critical temperature. 11
Annex C (informative) Critical pressure correlation between S4 and full-scale tests for PE pipes . 12
Annex D (informative) Fluid decompression and effect on RCP — Theoretical analysis . 13
Bibliography . 15

ISO 13477:2008(E)
Foreword
IISO (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 13477 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.
This second edition cancels and replaces the first edition (ISO 13477:1997), which has been technically
revised.
iv © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 13477:2008(E)

Thermoplastics pipes for the conveyance of fluids —
Determination of resistance to rapid crack propagation (RCP) —
Small-scale steady-state test (S4 test)
1 Scope
This International Standard specifies a small-scale (S4) test method for determining the arrest or propagation
of a crack initiated in a thermoplastics pipe at a specified temperature and internal pressure.
This International Standard is applicable to the assessment of the performance of thermoplastics pipes
intended for the supply of gases or liquids. In the latter case, air can also be present in the pipe.
NOTE This test method was developed using monolayer thermoplastics pipes. Its applicability to multi-layer/coated
pipes has yet to be fully confirmed and is under study.
2 Normative references
The following referenced documents are indispensable for the application 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 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
3 Terms and definitions
For the purposes of this International Standard, the terms and definitions given in ISO 161-1 and ISO 11922-1
apply.
4 Symbols and abbreviated terms
d minimum internal diameter, in millimetres, of pipe
i,min
d nominal external diameter, in millimetres, of pipe
n
e nominal wall thickness, in millimetres, of pipe
n
ISO 13477:2008(E)
l longitudinal crack length, in millimetres, on the outer surface of the pipe specimen, measured from
c
the centre of the striker blade
RCP rapid crack propagation
SDR standard dimension ratio (d /e )
n n
T nominal test temperature, in degrees Celsius, as specified by referring standard
T conditioning temperature, in degrees Celsius, of pipe (see Clause 9)
cond
5 Principle
A section of thermoplastics test pipe of specified length, conditioned to a specified test temperature and
containing a fluid at a specified test pressure, is subjected to an impact near one end, designed to initiate a
fast-running longitudinal crack. The crack-initiation process itself is designed so that it disturbs the test pipe as
little as possible.
The test temperature and/or test pressure are as defined in the referring standard.
The fluid or mixture of fluids is identical to that used in the intended application, or is a substitute fluid which
gives equivalent results. The temperature of the fluid is between the test temperature and the laboratory
temperature.
Rapid decompression ahead of the propagating crack is retarded by internal baffles and by an external cage
which restricts flaring of the test pipe at the edges of the fracture. Retardation of decompression maintains the
crack tip stress at a level approaching that of the hoop stress in the pipe developed by internal pressure. This
technique achieves steady-state RCP in a short pipe specimen at a lower pressure than that necessary to
achieve propagation in the same pipe using a full-scale test (FST).
The test pipe is subsequently examined to determine whether arrest or propagation of the crack has occurred.
From a series of such tests at different pressures but at a constant temperature, the critical pressure or critical
hoop stress for RCP can be determined (see Annex A).
Similarly, by testing at a series of temperatures but at a constant pressure or hoop stress, the critical
temperature for RCP can be determined (see Annex B).
This test involves fracture of a pipe test piece pressurized with a compressible fluid, normally air. Therefore,
the appropriate safety precautions should be taken with respect to noise and the risk of flying debris.
6 Test parameters
It is assumed that the following parameters will be set by the referring product standard:
a) the diameter(s) and series of the pipe(s) to be tested;
b) the pressurizing fluid(s), e.g. air, or air plus water and proportion;
c) the test pressure(s);
d) the test temperature(s), see Clause 9.
2 © ISO 2008 – All rights reserved

ISO 13477:2008(E)
7 Apparatus
7.1 General
The apparatus shall generally comply with Figure 1, with essential features as specified in 7.2 to 7.6. The
apparatus shall be located in a laboratory maintained at a temperature of no more than 25 °C.
The test should be carried out in still air to avoid significant change of the pipe surface temperature.

Key
1 striker blade
2 anvil
3 test pipe
4 containment-cage rings
5 decompression baffle
a
Anvil zone.
b
Gauge length (> 5d ).
n
Figure 1 — Apparatus for S4 test
7.2 Containment cage
The containment cage shall allow free expansion of the test pipe during pressurization, but shall restrict radial
expansion during fracture to within a maximum diameter of (1,1 ± 0,04)d at all points round the circumference.
n
The cage rings shall not touch or be supported by the test pipe and shall be concentric with it.
Within the region between the crack-initiation point and the end of the gauge length, the pitch of the
containment rings shall be (0,35 ± 0,05)d and the longitudinal width of each ring shall be (0,15 ± 0,05)d .
n n
7.3 Gauge length
The gauge length shall be greater than 5d . At least 70 % of its internal volume shall be occupied by
n
pressurized air that can expand without restriction to drive the test pipe wall radially outwards.
Instrumentation shall be provided to measure the static pressure inside the test pipe to an accuracy of ±2 %.
ISO 13477:2008(E)
7.4 Decompression baffles
The decompression baffles shall be (0,95 ± 0,01) d in diameter. The pitch of the baffles shall be
i,min
0,4d .
n
–0,1d
n
Baffles should be of a material and thickness sufficient to withstand the forces expected during the test without
significant distortion.
7.5 Crack-initiation equipment
The length of the striker-blade edge shall be (0,40 ± 0,05)d . The height o
...