ISO 24033:2009

INTERNATIONAL ISO
STANDARD 24033
Second edition
2009-01-15
Polyethylene of raised temperature
resistance (PE-RT) pipes — Effect of time
and temperature on the expected
strength
Tubes en polyéthylène de meilleure résistance à la température
(PE-RT) — Influence du temps et de la température sur la résistance
espérée
Reference number
©
ISO 2009
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ii © ISO 2009 – All rights reserved

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
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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 24033 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 24033:2006), which is extended to cover
PE-RT materials, type II, which have a higher hoop stress performance at higher temperatures than type I.
The first edition dealt only with PE-RT materials, currently designated type I.
Introduction
An increasing number of types of polyethylene (PE) polymers, made in a variety of processes, is on the
market for different applications in plastic piping and ducting systems. Many applications have their own
system standard that defines the properties and requirements for the pipes and fittings used.
The types of PE suitable for use in hot and cold water systems are basically different from those for
applications at ambient temperatures such as in water supply, sewage and drainage, and gaseous fuels.
Therefore, it makes sense to differentiate those PE having raised temperature-resistance by terming them
1)
“PE-RT” (for polyethylene of raised temperature) .
See the foreword for details of PE-RT materials, types I and II.

1) Abbreviated term based on the provisions of, and guidance for preparing new abbreviated terms for, basic polymers,
[1]
mixtures of polymers, and related terms given in ISO 1043-1 .
iv © ISO 2009 – All rights reserved

INTERNATIONAL STANDARD ISO 24033:2009(E)

Polyethylene of raised temperature resistance (PE-RT) pipes —
Effect of time and temperature on the expected strength
1 Scope
This International Standard specifies minimum values for expected strength as a function of time and
temperature in the form of reference lines, for use in calculations on pipes made of:
a) polyethylene of raised temperature resistance (PE-RT) type I;
b) PE-RT type II.
2 Normative references
The following referenced documents are indispensable for the application 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 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids ― Determination of
the resistance to internal pressure ― Part 1: General method
ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids ― Determination of
the resistance to internal pressure ― Part 2: Preparation of pipe test pieces
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
reference line
〈PE-RT pipes〉 generic description of the minimum long-term hydrostatic strength to be expected from a
particular polymer
NOTE 1 A reference line is not to be considered as characteristic of a specific grade or of material from a specific
supplier.
NOTE 2 A line is described by a mathematical equation, which
...