SIST EN ISO 13967:2010

Thermoplastics fittings - Determination of ring stiffness (ISO 13967:2009)

This International Standard specifies a method of determining the ring stiffness of bends and branches made from thermoplastic material and for use with plastics pipes having a circular cross-section. The method can be used to determine the stiffness of bends, equal branches and unequal branches, provided the fitting allows a diametric deflection of at least 4 %.

Thermoplastische Formstücke - Bestimmung der Ringsteifigkeit (ISO 13967:2009)

Diese Internationale Norm legt ein Verfahren zur Bestimmung der Ringsteifigkeit von Bögen und Abzweigen aus thermoplastischen Werkstoffen zur Verwendung in Kunststoffrohren mit kreisförmigem Querschnitt fest.
Das Verfahren kann zur Bestimmung der Steifigkeit von Bögen und gleichen und ungleichen Abzweigen unter der Voraus¬setzung angewendet werden, dass das Formstück eine Ringverformung von mindestens 4 % zulässt.
ANMERKUNG 1   Wenn ein Formstück über dieselbe Wanddicke, Wandbeschaffenheit sowie denselben Werkstoff und Durchmesser wie ein nach ISO 9969 geprüftes Rohr verfügt, so ist seine Steifigkeit auf Grund seiner Geometrie gleich oder größer als die des Rohres. In solch einem Fall kann das Formstück ohne Prüfung derselben Steifigkeitsklasse wie das Rohr zugeordnet werden.
ANMERKUNG 2   Bei jedem ungleichen Abzweig kann davon ausgegangen werden, dass er mindestens dieselbe Steifigkeit wie ein gleicher Abzweig hat, vorausgesetzt, dass er denselben Hauptdurchmesser und dieselbe Wand¬beschaffenheit aufweist und aus demselben Werkstoff besteht wie der gleiche Abzweig.
ANMERKUNG 3   Bei einem Reduzierstück mit derselben Wanddicke, Wandbeschaffenheit und aus demselben Werk¬stoff im Übergangsbereich wie ein geprüfter Bogen oder Abzweig kann davon ausgegangen werden, dass es mindestens über dieselbe Steifigkeit wie der geprüfte Bogen oder Abzweig mit dem größten Durchmesser dieses Reduzierstückes verfügt.
ANMERKUNG 4   Das Ergebnis der Prüfung spiegelt die Verformungsbeständigkeit des Formstückes in eingebautem Zustand wider. Hinweise zur Bedeutung des Prüfergebnisses werden in Anhang A gegeben.

Raccords en matières thermoplastiques - Détermination de la rigidité annulaire (ISO 13967:2009)

L'ISO 13967:2009 spécifie une méthode de détermination de la rigidité annulaire des coudes et des culottes en matières thermoplastiques, utilisés avec des tubes de section circulaire en matières plastiques. La méthode peut servir à déterminer la rigidité des coudes, des culottes égales et des culottes réduites, à condition que les raccords admettent une déformation annulaire d'au moins 4 %.

Plastomerni fitingi - Določevanje obodne togosti (ISO 13967:2009)

Ta mednarodni standard določa metodo za ugotavljanje obodne togosti kolen in krakov, narejenih iz plastomernega materiala, ki se uporabljajo s polimernimi cevmi s krožnim prerezom. Metoda se lahko uporablja za ugotavljanje togosti kolen ter enakih in neenakih krakov pod pogojem, da fiting omogoča vsaj 4-odstotno diametrično upogibanje.

General Information

• Status: Published
• Public Enquiry End Date: 09-Oct-2008
• Publication Date: 14-Mar-2010
• ICS: 23.040.45 - Plastics fittings
• Technical Committee: PCV - Plastic pipes, fittings and valves
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 15-Feb-2010
• Due Date: 22-Apr-2010
• Completion Date: 15-Mar-2010
• Ref Project: EN ISO 13967:2009 - Thermoplastics fittings - Determination of ring stiffness (ISO 13967:2009)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 13967:2010
01-april-2010
3ODVWRPHUQLILWLQJL'RORþHYDQMHRERGQHWRJRVWL,62
Thermoplastics fittings - Determination of ring stiffness (ISO 13967:2009)
Thermoplastische Formstücke - Bestimmung der Ringsteifigkeit (ISO 13967:2009)
Raccords en matières thermoplastiques - Détermination de la rigidité annulaire (ISO
13967:2009)
Ta slovenski standard je istoveten z: EN ISO 13967:2009
ICS:
23.040.45 Fitingi iz polimernih Plastics fittings
materialov
SIST EN ISO 13967:2010 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 13967:2010

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SIST EN ISO 13967:2010


EUROPEAN STANDARD
EN ISO 13967

NORME EUROPÉENNE

EUROPÄISCHE NORM
December 2009
ICS 23.040.45
English Version
Thermoplastics fittings - Determination of ring stiffness (ISO
13967:2009)
Raccords en matières thermoplastiques - Détermination de Thermoplastische Formstücke - Bestimmung der
la rigidité annulaire (ISO 13967:2009) Ringsteifigkeit (ISO 13967:2009)
This European Standard was approved by CEN on 14 December 2009.

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: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13967:2009: E
worldwide for CEN national Members.

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SIST EN ISO 13967:2010
EN ISO 13967:2009 (E)
Contents Page
Foreword .3

2

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SIST EN ISO 13967:2010
EN ISO 13967:2009 (E)
Foreword
This document (EN ISO 13967:2009) has been prepared by Technical Committee ISO/TC 45 "Rubber and
rubber products" 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 June 2010, and conflicting national standards shall be withdrawn at
the latest by June 2010.
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 13967:2009 has been approved by CEN as a EN ISO 13967:2009 without any modification.

3

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SIST EN ISO 13967:2010

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SIST EN ISO 13967:2010

INTERNATIONAL ISO
STANDARD 13967
Second edition
2009-12-15


Thermoplastics fittings — Determination
of ring stiffness
Raccords en matières thermoplastiques — Détermination de la rigidité
annulaire




Reference number
ISO 13967:2009(E)
©
ISO 2009

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SIST EN ISO 13967:2010
ISO 13967:2009(E)
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ii © ISO 2009 – All rights reserved

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SIST EN ISO 13967:2010
ISO 13967:2009(E)
Contents Page
Foreword .iv
1 Scope.1
2 Terms and definitions .1
3 Symbols.3
4 Principle.3
5 Apparatus.3
6 Test pieces .4
6.1 Preparation.4
6.2 Number .5
6.3 Determination of dimensions.5
6.4 Age .7
7 Conditioning .8
8 Test temperature .8
9 Procedure.8
10 Calculation of ring stiffness .10
11 Test report.11
Annex A (informative) Comments on the use of this test method.12
Bibliography.14

© ISO 2009 – All rights reserved iii

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SIST EN ISO 13967:2010
ISO 13967:2009(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 13967 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 13967:1998), which has been technically
revised.

iv © ISO 2009 – All rights reserved

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SIST EN ISO 13967:2010
INTERNATIONAL STANDARD ISO 13967:2009(E)

Thermoplastics fittings — Determination of ring stiffness
1 Scope
This International Standard specifies a method of determining the ring stiffness of bends and branches made
from thermoplastic material and for use with plastics pipes having a circular cross-section.
The method can be used to determine the stiffness of bends, equal branches and unequal branches, provided
the fitting allows a diametric deflection of at least 4 %.
NOTE 1 If a fitting has the same wall thickness, wall construction, material and diameter as a pipe tested according to
ISO 9969, then, because of its geometry, its stiffness can be equal to or greater than that of the pipe. In this case, the
fitting can be classified as having the same stiffness class as the pipe, without testing.
NOTE 2 Any unequal branch can be expected to have at least the same stiffness as an equal branch, provided that it
has the same main diameter, wall construction and material as the equal branch.
NOTE 3 A reducer having the same wall thickness, wall construction and material in the transition zone as a tested
bend or branch can be expected to have at least the same stiffness as the tested bend or branch with the largest diameter
of that reducer.
NOTE 4 The result of the test reflects the resistance the fitting has against deflection when installed. Advice on the
significance of the test result is given in Annex A.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
ring stiffness
S
mechanical characteristic of a fitting, which is a measure of the resistance to diametric deflection under an
external force applied between two parallel planes, as determined in accordance with this International
Standard
NOTE 1 This method uses a deflection of 3 % as the reference at which to determine this characteristic.
NOTE 2 Throughout this International Standard, the term “ring stiffness” is used. In ISO 9969 that describes a method
of determining the stiffness of a plastics pipe; the word “ring” is appropriate and is used to differentiate the circumferential
stiffness or ring stiffness from the axial stiffness or longitudinal stiffness. The pipe test pieces have the shape of rings.
Although fittings do not have the shape of rings, to emphasize the relationship between this International Standard and
ISO 9969 and to stress that in both cases the stiffness is related to the resistance of the product to diametric deflection,
the word “ring” has been retained in this International Standard for the determination of the stiffness of fittings.
2.2
compressive force
compressive load
F
force applied to cause the diametric deflection during testing in accordance with this International Standard
© ISO 2009 – All rights reserved 1

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SIST EN ISO 13967:2010
ISO 13967:2009(E)
2.3
diametric deflection
y
change in diameter caused by a compressive force
2.4
percent deflection
diametric deflection, y, expressed as a percentage of the inside diameter, D , of the fitting
i
NOTE Percent deflection is expressed as Equation (1):
y
×100 (1)
D
i
2.5
fitting wall height
e
c
overall thickness of the wall of a fitting, measured across the entire cross-section of the wall
NOTE For examples of fitting wall heights, see Figure 1.

Figure 1 — Typical fitting wall heights, e
c
2.6
calculation length
L
external free length of a fitting, excluding sockets, spigots, inlet zones and half of the transition zones between
body and sockets, measured along a line parallel to the fitting axis
NOTE 1 The calculation length, L, depends on the geometry of the fitting, as specified in Clause 6. See Figures 3, 4
and 5.
NOTE 2 The length of loading is normally slightly shorter than the calculation length. This difference has no significant
influence on the result of the test.
2 © ISO 2009 – All rights reserved

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SIST EN ISO 13967:2010
ISO 13967:2009(E)
3 Symbols
Symbol Description Unit
D Inside diameter of fitting mm
i
D Nominal diameter of fitting mm
n
e Height of fitting wall mm
c
F Force N
L
Calculation length mm

2
S Calculated ring stiffness
kN/m

2
S Ring stiffness of test piece “a”
N/m

a
2
S Ring stiffness of test piece “b”
N/m

b
2
S Ring stiffness of test piece “c”
N/m

c
y diametric deflection mm
4 Principle
Test pieces shall be compressed across their diameter at a constant rate of deflection between two parallel
plates. Force versus deflection data shall be generated.
The force shall be applied as a load distributed along the body of the fitting without loading the spigot(s)
and/or socket(s).
The ring stiffness shall be calculated as a function of the force necessary to produce a 3 % diametric
deflection of the fitting.
NOTE As fittings are normally installed with socket and spigot connections, creating zones of high stiffness, the load
is only applied to the body of the fitting and the equation used to calculate the stiffness uses the length of the body and not
the overall length of the fitting.
5 Apparatus
5.1 Compression testing machine, capable of a constant rate of crosshead movement appropriate to the
nominal diameter of the fitting in accordance with Table 1, with sufficient force and travel to produce the
specified diametric deflection via a pair of bearing plates.
5.2 Bearing plates, capable of transferring the force and movement of the test machine (5.1) to the test
piece and comprising a pair of bearing plates alone or in combination with insert plates as described in 5.
...