ISO 17455:2005

INTERNATIONAL ISO
STANDARD 17455
First edition
2005-10-01
Plastics piping systems — Multilayer
pipes — Determination of the oxygen
permeability of the barrier pipe
Systèmes de canalisations en plastiques — Tubes multicouches —
Détermination de la perméabilité à l'oxygène de la couche barrière d'un
tube
Reference number
©
ISO 2005
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ii © ISO 2005 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Principle. 1
3 Terms and definitions. 1
4 Symbols and abbreviated terms . 2
5 Apparatus . 3
6 Test piece . 4
7 Preconditioning. 4
8 Calibration of the test assembly . 4
9 Preparation for testing . 4
10 Measuring procedure . 5
11 Calculation of flux. 7
12 Test report . 8
Annex A (informative) Oxygen solubility as a function of temperature . 9
Bibliography . 10

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
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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 17455 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.
iv © ISO 2005 – All rights reserved

Introduction
In response to the worldwide demand for specifications, requirements and test methods for multilayer pipes,
WG 16 of ISO/TC 138/SC 5 was created at a meeting held in Kyoto, Japan, in 1998. The working group then
started drafting three test standards (including ISO 17455) for multilayer pipes:
⎯ ISO 17456, Plastics piping systems — Multilayer pipes — Determination of long-term strength;
⎯ ISO 17454, Plastics piping systems — Multilayer pipes — Test method for the adhesion of the different
layers by using a pulling rig.
Only multilayer pipes are dealt with in this International Standard and for these purposes cross-linked
polyethylene (PE-X) as well as adhesives are to be considered as a thermoplastics material.
INTERNATIONAL STANDARD ISO 17455:2005(E)

Plastics piping systems — Multilayer pipes — Determination of
the oxygen permeability of the barrier pipe
1 Scope
This International Standard specifies two test methods for determining the oxygen permeability of barrier pipe:
the dynamic (Method I) and the static (Method II). In principle, both methods give the same results. The
method to be applied is not application-dependent, but can be specified in the referring standard.
2 Principle
The principle is measurement of the oxygen transfer through the wall of the test piece under specified
conditions.
The oxygen increase is measured in a system of which the test piece forms part. Oxygen can only be
transported through the wall of the test piece. Therefore, the increased amount of oxygen in the closed system
is the result of the functioning of the barrier layer of the test piece.
NOTE A certain continuous oxygen permeation through the barrier layer is allowed.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
multilayer pipe
pipe comprising layers of different materials
3.2
multilayer M pipe
multilayer pipe comprising layers of polymers and one or more metal layers
NOTE The wall thickness of the pipe consists of at least 60 % polymer layers.
3.3
multilayer P pipe
multilayer pipe comprised of two or more polymer layers
3.4
inner layer
layer in contact with the liquid or gas
3.5
outer layer
layer exposed to the outer environment
3.6
embedded layer
layer between the outer and inner layer
NOTE There can be more than one embedded layer.
3.7
barrier layer
layer intended to prevent or greatly diminish oxygen transport from outside the pipe into the inside water
NOTE For multilayer P pipes, the barrier layer is normally not stress-designed.
3.8
closed system
system which comprises stainless steel pipes, couplings and a tap, as well as the test piece, allowing only
oxygen to permeate from the outside to the inside of the test piece
3.9
flux
oxygen permeability of the barrier layer of the pipe
4 Symbols and abbreviated terms
A outside surface of the barrier layer, in square metres (m )
barr
C oxygen concentration after time , in grams per cubic metre (g/m )
ox, t
F flux expressed in oxygen transfer per unit per area (of the barrier layer),in grams per square
ox
metre per hour (g/m ⋅ h)
T test temperature (40°C or 80°C), expressed in degrees Centigrade
V volume of the closed system, excluding the volume of the test piece, in cubic metres (m )
app
V volume of the test piece (pipe sample), in cubic metres (m )
pipe
d outside diameter of the barrier layer, millimetres (mm)
b
d manufacturer's nominal outside diameter, expressed in millimetres (mm)
e
d inside diameter of the test piece (pipe), in millimetres (mm)
i
l length of the test piece, in metres (m)
1)
P standard atmospheric pressure (1 000 mbar at 20°C), expressed in bar
a
P atmospheric pressure at the end of the measurement, expressed in bar
fin
P atmospheric pressure at the start of the measurement, expressed in bar
init
t test period, in hours (h)
β dimensionless correction factor to atmospheric pressure
pr
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm
2 © ISO 2005 – All rights reserved

O total amount of oxygen after six hours, in grams (g)
2,fin
∫
6=0
O total amount of oxygen in the water at the start of the test, in grams (g)
H O,init
∫
5 Apparatus
The test assembly shall include the following main elements:
NOTE 1 The test temperature (40°C or 80°C) is specified in the relevant product- or system standard.
NOTE 2 1 ppb = 1 g/m .
5.1 Oven, capable of maintaining a constant temperature of (40 ± 0,5) °C and/or (80 ± 0,5) °C.
5.2 Test rig, a closed system consisting of stainless steel parts of pipes, couplings, valves (only for
Method II) and taps, including the test piece.
5.3 Water circulation pump, capable of a variable delivery with a
...