SIST EN ISO 9969:1997

SLOVENSKI STANDARD
SIST EN ISO 9969:1997
01-februar-1997
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Thermoplastics pipes - Determination of ring stiffness (ISO 9969:1994)
Thermoplastische Rohre - Bestimmung der Ringsteifigkeit (ISO 9969:1994)
Tubes en matieres thermoplastiques - Détermination de la rigidité annulaire (ISO
9969:1994)
Ta slovenski standard je istoveten z: EN ISO 9969:1995
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
SIST EN ISO 9969:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9969:1997

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SIST EN ISO 9969:1997

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SIST EN ISO 9969:1997

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SIST EN ISO 9969:1997
INTERNATIONAL
IS0
STANDARD
9969
First edition
1994-03-01
Thermoplastics pipes - Determination of
ring stiffness
Tubes en matieres thermoplastiques - D&ermina tion de la rigidit
annulaire
Reference number
IS0 9969: 1994(E)

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SIST EN ISO 9969:1997
IS0 9969: 1994(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
(I EC) 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 9969 was prepared by Technical Committee
lSO/TC 138, Plastics pipes, fittings and valves for the transport of fluids,
Sub-Committee SC 1, Plastics pipes and fittings for soil, waste and drain-
age (including land drainage).
0 IS0 1994
All rights reserved. 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 per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO 9969:1997
INTERNATIONAL STANDARD IS0 9969: 19941 E)
Thermoplastics pipes - Determination of ring
stiffness
travel to produce the specified deflection (see
1 Scope
clause 7) via a pair of parallel plates (4.2).
This International Standard specifies a method of de-
termining the ring stiffness of thermoplastics pipes
Table 1 -
Deflection speeds
having a circular cross-section.
Deflection speed
Nominal diameter 8, of pipe
mm/min
mm
2 Symbols
d& 100 2 It a4
The following symbols are used in this International
Standard: 100 200 Units
400<4,< 1 000 20 * 2
nominal diameter of pipe mm
4
ci, > 1 000
50 + 5
internal diameter of pipe test piece m
4
F loading force kN
L length of test piece m
4.2 Two steel plates, through which the
compressive force can be applied to the test piece.
ring stiffness kN/m*
s
The plates shall be flat, smooth and clean and shall
m
vertical deflection
Y
not deform during the test to an extent that would
affect the results.
3 Principle
The length of each plate shall be at least equal to the
length of the test piece. The width of each plate shall
The ring stiffness is determined by measuring the
be not less than the maximum width of the surface
force and the deflection while deflecting the pipe at
in contact with the test piece while under load plus
a constant rate.
25 mm.
A length of pipe supported horizontally is compressed
vertically between two parallel flat plates moved at a
4.3 Measuring devices, capable of determining
constant speed which is dependent upon the diam-
eter of the pipe.
- the length of the test piece to within 1 mm (see
.
.
A plot of force versus deflection is generated. The ring 5 2) I
stiffness is calculated as a function of the force
- the inside diameter of the test piece to within
necessary to produce a deflection of 0,034
0,5 %;
diametrically across the pipe.
- the change in inside diameter of the test piece in
4 Apparatus
the direction of loading with an accuracy of
0,l mm, or 1 % of the deflection, whichever is the
4.1 Compressive-testing machine, capable of a
greater.
constant rate of crosshead movement adjustable as
appropriate to the nominal diameter of the pipe in An example of a device for measuring the inside di-
conformance with table 1, with sufficient force and ameter of corrugated pipes is shown in figure 1.
1

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SIST EN ISO 9969:1997
IS0 9969: 1994(E)
Figure 1
- Example of a device for measuring the inside diameter of a corrugated pipe
4.4 Force-measuring device, capable of determin- Each of the three to six length measurements shall
ing to within 2 % the force necessary to produce a
be made to within 1 mm.
1 % to 4 % deflection of the test piece diametrically
For each individual test piece, the smallest of the
across the test piece.
three to six length measurements shall not be less
than 0,9 times the largest measurement.
5 Test pieces
5.2.2 For pipes that have nominal diameters less
than or equal to 1 500 mm, the average length of
each test piece shall be 300 mm + 10 mm.
-
5.1 Marking and number of test pieces
The pipe for which the ring stiffness is to be deter-
5.2.3 For pipes that have nominal diameters greater
mined shall be marked on the outside along its full
than 1 500 mm, the average length, in millimetres, of
length with a line along one generatrix. Three test
each test piece shall be at least 0,2d,.
pieces, a, b and c, respectively, shall be taken from
this marked pipe such that the ends of the test pieces
are perpendicular to the pipe axis and their lengths
conform to 5.2.
5.2.4 Structured-wall pipes with perpendicular ribs
or corrugatio
...