SIST EN ISO 9967:2008
Thermoplastics pipes - Determination of creep ratio (ISO 9967:2007)
Thermoplastics pipes - Determination of creep ratio (ISO 9967:2007)
This International Standard specifies a method for determining the creep ratio of thermoplastics pipes having a circular cross-section.
Thermoplastische Rohre - Bestimmung des Verformungsverhaltens (ISO 9967:2007)
Diese Internationale Norm legt ein Verfahren zur Bestimmung des Verformungsverhaltens von thermoplastischen Rohren mit kreisförmigem Querschnitt fest.
Tubes en matieres thermoplastiques - Détermination du taux de fluage (ISO 9967:2007)
L'ISO 9967:2007 spécifie une méthode de détermination du taux de fluage de tubes en matières thermoplastiques ayant une section circulaire.
Cevi iz polimernih materialov - Določanje razmerja lezenja (ISO 9967:2007)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 9967:2008
01-junij-2008
1DGRPHãþD
SIST EN ISO 9967:1997
&HYLL]SROLPHUQLKPDWHULDORY'RORþDQMHUD]PHUMDOH]HQMD ,62
Thermoplastics pipes - Determination of creep ratio (ISO 9967:2007)
Thermoplastische Rohre - Bestimmung des Verformungsverhaltens (ISO 9967:2007)
Tubes en matieres thermoplastiques - Détermination du taux de fluage (ISO 9967:2007)
Ta slovenski standard je istoveten z: EN ISO 9967:2007
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
SIST EN ISO 9967:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN ISO 9967
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2007
ICS 23.040.20 Supersedes EN ISO 9967:1995
English Version
Thermoplastics pipes - Determination of creep ratio (ISO
9967:2007)
Tubes en matières thermoplastiques - Détermination du Thermoplastische Rohre - Bestimmung des
taux de fluage (ISO 9967:2007) Verformungsverhaltens (ISO 9967:2007)
This European Standard was approved by CEN on 2 November 2007.
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
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9967:2007: E
worldwide for CEN national Members.
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EN ISO 9967:2007 (E)
Contents Page
Foreword.3
2
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EN ISO 9967:2007 (E)
Foreword
This document (EN ISO 9967:2007) 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 May 2008, and conflicting national standards shall be withdrawn at the
latest by May 2008.
This document supersedes EN ISO 9967:1995.
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 9967:2007 has been approved by CEN as a EN ISO 9967:2007 without any modification.
3
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INTERNATIONAL ISO
STANDARD 9967
Second edition
2007-11-15
Thermoplastics pipes — Determination
of creep ratio
Tubes en matières thermoplastiques — Détermination du taux de fluage
Reference number
ISO 9967:2007(E)
©
ISO 2007
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ISO 9967:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 9967:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Symbols . 1
3 Principle. 1
4 Apparatus . 2
5 Test pieces . 2
6 Conditioning. 4
7 Test procedure . 4
8 Determination of the creep ratio . 5
9 Test report . 9
Annex A (informative) Creep in thermoplastics material . 10
Bibliography . 12
© ISO 2007 – All rights reserved iii
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ISO 9967:2007(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 9967 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 9967:1994), which has been technically revised.
iv © ISO 2007 – All rights reserved
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ISO 9967:2007(E)
Introduction
Experience shows that when a pipe is installed in the soil in accordance with an appropriate code of practice
its increase in deflection virtually stops after a short period. Depending on the soil and installation conditions
this period will vary but normally not exceed two years.
Therefore, the two-year creep ratio as determined in accordance with this International Standard is intended
for use when long-term static calculations are carried out.
The theory of creep in thermoplastics materials is briefly explained in Annex A.
For experiments, the test can be carried out based on other ages of the test pieces, other test temperatures
and/or other test durations.
© ISO 2007 – All rights reserved v
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INTERNATIONAL STANDARD ISO 9967:2007(E)
Thermoplastics pipes — Determination of creep ratio
1 Scope
This International Standard specifies a method for determining the creep ratio of thermoplastics pipes having
a circular cross-section.
2 Symbols
Unit
d nominal diameter of pipe mm
n
d inside diameter of test piece of pipe mm
i
F loading force kN
F pre-load force N
0
L length of test piece mm
y measured initial deflection mm
0
Y calculated deflection at time t mm
t
Y extrapolated two-year deflection mm
2
δ vertical deflection used to determine the loading force mm
creep ratio
γ
3 Principle
A cut length of pipe is placed between two parallel flat horizontal plates and a constant compressive force is
applied for 1 008 h (42 days).
The deflection of the pipe is recorded at specified intervals so as to prepare a plot of pipe deflection against
time. The linearity of the data is analysed and the creep ratio is calculated as the ratio between the two years’
extrapolated deflection value and the measured 6 min (0,1 h) deflection.
NOTE It is assumed that the test temperature, as appropriate (see 7.1), is set by the referring standard.
© ISO 2007 – All rights reserved 1
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ISO 9967:2007(E)
4 Apparatus
4.1 Compressive loading machine, capable of applying via plates (4.2) and maintaining to within 1 %
both the applicable pre-load force, F (see 7.4), and the necessary loading force, F (see 7.5), on the pipe.
0
The force may be applied either directly or indirectly, e.g. by use of a lever arm arrangement.
4.2 Two plates, through which the compressive force can be applied to the test piece. The plates shall be
flat, smooth and clean and shall not deform during the test to an extent that would affect the results.
The length of each plate shall be at least equal to the length of the test piece. The width of each plate shall be
not less than the maximum width of the contact surface with the test piece while under load plus 25 mm.
4.3 Dimensional measuring devices, capable of determining:
⎯ individual values for the length of a test piece (see 5.2) to within 1 mm;
⎯ the inside diameter of a test piece to within 0,1 mm or 0,2 % d , whichever is the greater;
i
⎯ the change in inside diameter of a test piece in the direction of loading with an accuracy of 0,1 mm or
0,1 % of the deflection, whichever is the greater.
The change in inside diameter may be measured inside the pipe or be determined from the movement of the
upper plate. In case of dispute the inside diameter shall be used as reference.
An example of a device for measuring the inside diameter of corrugated pipes is shown in Figure 1.
Figure 1 — Example of device for measuring
the inside diameter of a corrugated pipe
4.4 Timer, capable of determining the first 6 min with an accuracy to within 1 s and the remaining times to
within 0,1 % (see 7.5 and 7.6).
5 Test pieces
5.1 Marking and number of test pieces
The pipe of which the creep ratio is to be determined shall be marked on its outside with a line along one
generatrix for its full length. Three test 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 Length of test pieces
5.2.1 The length of each test piece shall be determined by calculating the arithmetic average of three to six
measurements of length equally spaced around the perimeter of the pipe as given in Table 1. The length of
each test piece shall conform to 5.2.2, 5.2.3, 5.2.4 or 5.2.5, as applicable.
2 © ISO 2007 – All rights reserved
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ISO 9967:2007(E)
Each of the three to six length measurements shall be determined to within 1 mm.
For each individual test piece, the smallest of the three to six measurements shall not be less than 0,9 times
the largest length measurement.
Table 1 — Number of length measurements
Nominal diameter, d , of pipe
n Number of length
measurements
mm
d u 200 3
n
200 < d < 500 4
n
d W 500 6
n
5.2.2 For pipes that have a nominal d
...
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