ISO 13265:2024
(Main)Thermoplastics piping systems for non-pressure underground drainage and sewerage — Joints for buried non-pressure applications — Test method for the long-term sealing performance of joints with elastomeric seals by estimating the sealing pressure
Thermoplastics piping systems for non-pressure underground drainage and sewerage — Joints for buried non-pressure applications — Test method for the long-term sealing performance of joints with elastomeric seals by estimating the sealing pressure
This document specifies a method for determining the long-term sealing pressure of elastomeric seals in assembled joints for buried non-pressure sewerage plastics piping and ducting systems.
Systèmes de canalisations thermoplastiques pour branchements et collecteurs d'assainissement enterrés sans pression — Assemblages pour applications enterrées sans pression — Méthode d'essai de la performance à long terme des assemblages avec garnitures d'étanchéité en élastomère par l'estimation de la pression d'étanchéité
L'ISO 13265:2010 spécifie une méthode permettant de déterminer la pression d'étanchéité à long terme des garnitures d'étanchéité en élastomère des assemblages de systèmes de canalisations et de gaines en plastiques sans pression et enterrés.
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Standards Content (Sample)
International
Standard
ISO 13265
Second edition
Thermoplastics piping systems
2024-05
for non-pressure underground
drainage and sewerage — Joints for
buried non-pressure applications
— Test method for the long-term
sealing performance of joints with
elastomeric seals by estimating the
sealing pressure
Systèmes de canalisations thermoplastiques pour branchements
et collecteurs d'assainissement enterrés sans pression —
Assemblages pour applications enterrées sans pression —
Méthode d'essai de la performance à long terme des assemblages
avec garnitures d'étanchéité en élastomère par l'estimation de la
pression d'étanchéité
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Principle . 2
6 Apparatus . 3
7 Test pieces . 4
7.1 General .4
7.2 Assembly .4
7.3 Leaktightness of the test system.4
8 Test procedure . 5
8.1 General .5
8.2 Procedure for determining the pressure .5
9 Calculation and expression of results . 6
9.1 Calculation .6
9.2 Example of calculation results .6
9.3 Continuation of test .7
10 Test report . 8
Annex A (informative) Example of a tube manufacturer's specification . 9
Annex B (informative) Description of a training test assembly .10
Bibliography .13
iii
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 1, Plastics pipes and fittings for soil, waste and drainage (including land
drainage).
This second edition cancels and replaces the first edition (ISO 13265:2010), which has been technically
revised.
The main changes are as follows:
— the principle of the method has been reviewed and updated;
— the apparatus and procedure have been reviewed and updated;
— the document has been editorially revised.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
International Standard ISO 13265:2024(en)
Thermoplastics piping systems for non-pressure
underground drainage and sewerage — Joints for buried
non-pressure applications — Test method for the long-term
sealing performance of joints with elastomeric seals by
estimating the sealing pressure
1 Scope
This document specifies a method for determining the long-term sealing pressure of elastomeric seals in
assembled joints for buried non-pressure sewerage plastics piping and ducting systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 9967, Thermoplastics pipes — Determination of creep ratio
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
EN 681-2, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 2: Thermoplastic elastomers
EN 681-3, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 3: Cellular materials of vulcanized rubber
EN 681-4, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 4: Cast polyurethane sealing elements
EN 837-1, Pressure gauges — Part 1: Bourdon tube pressure gauges — Dimensions, metrology, requirements
and testing
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Symbols
1)
B theoretical pressure, in bar
, in the polytetrafluoroethylene (PTFE) tube at t = 1 h
D drop factor of extrapolated pressure data at 24 h and 100 years
M gradient of the curve
p pressure
p pressure measured in the PTFE tube at a flow of 120 ml/min and the time t hours
t
p initial leakage pressure, in bar, measured in the PTFE tube after completing the assembly
p , p , p pressure measured in the three PTFE tubes in the tested joint, marked a, b and c,
ta tb tc
respectively, at time t hours
p extrapolated pressure, in bar, at 100 years
x
p calculated pressure, in bar, at 24 h
y
p , p , p extrapolated pressure, in bar, at 100 years in the three PTFE tubes in the tested joint,
xa xb xc
marked a, b and c, respectively
p arithmetic mean value of the pressures obtained for each of the three extrapolated values,
100 y
p , at 100 years
x
p arithmetic mean value of the pressures obtained for each of the three calculated values,
24 h
p , at 24 h
y
R correlation coefficient
t time, in hours
5 Principle
The sealing pressure in a joint is estimated by measuring the pressure necessary to lift the seal, in each of
three PTFE tubes, unless otherwise specified in other standards, equally distributed over the circumference
of a joint located between the rubber seal and the spigot or socket, as appropriate (see Figure 1).
In a temperature-controlled environment and at increasing time intervals, a constant flow rate of 120 ml/
min of nitrogen or air is forced through three flexible PTFE tubes.
If it was not possible to keep the pressure constant at 120 ml/min during the measurement, calculate the
pressure value, p, at a flow rate of 120 ml/min according to 8.2. For this purpose, the intersection point of
the pressure at 120 ml/min shall be read from the recorded pressure/flow curve and this resulting pressure
shall be recorded.
The nitrogen or air pressure, p, necessary to achieve this flow, is measured. The pressure, p , is measured at
t
increasing time intervals over a period of time. The extrapolated regression lines for p are used to calculate
t
the estimated value p at 100 years and p at 24 h.
x y
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
Key
1 regulator/pressure controller 6 test assembly base
2 pressure gauge 7 position of the tube in a joint with sealing ring
positioned in the socket
3 fixed coupler 8 connecting tube
4 PTFE tube 9 flow meter
a
5 position of the tube in a joint with the sealing ring Source of nitrogen or clean air.
positioned on the spigot
Figure 1 — Typical arrangement of the test assembly
6 Apparatus
6.1 Source of nitrogen, with a purity of at least 99,8 % or, alternatively, cleaned air (oil-free), capable of
supplying a pressure of at least 10 bar.
6.2 Regulator/pressure controller, capable of regulating of pressure at least 10 bar and a flow at least of
up to 200 ml/min.
6.3 Pressure gauge, for measuring the pressure in the main line and capable of checking conformity to
8.2 (class 0,6 or better, in accordance with EN 837-1).
6.4 Connecting tube, with an inside diameter of at least 4 mm.
6.5 PTFE tube, conforming to the following:
a) capable of sustaining at least 10 bar pressure;
b) the total thickness of the flattened PTFE tube shall be between 0,12 mm and 0,24 mm, measured in the
middle of the sample and carried out in two positions perpendicular to each other;
c) the total width of the flattened t
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