ISO 12230:2012
(Main)Polybutene-1 (PB-1) pipes — Effect of time and temperature on the expected strength
Polybutene-1 (PB-1) pipes — Effect of time and temperature on the expected strength
ISO12230:2012 specifies minimum values for the expected strength as a function of time and temperature in the form of reference lines and tabulated data, for use in calculations on pipes made of polybutene-1 homopolymer (PB-H), and polybutene-1 random copolymer (PB-R). For the sake of simplicity the designation polybutene and the abbreviation PB are used throughout.
Tubes en polybutène-1 (PB-1) — Influence du temps et de la température sur la résistance espérée
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 12230
Second edition
2012-06-01
Polybutene-1 (PB-1) pipes — Effect of time
and temperature on the expected strength
Tubes en polybutène-1 (PB-1) — Influence du temps et de la
température sur la résistance espérée
Reference number
ISO 12230:2012(E)
©
ISO 2012
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ISO 12230:2012(E)
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ii © ISO 2012 – All rights reserved
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ISO 12230:2012(E)
Contents Page
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic equations . 2
4.1 General . 2
4.2 Polybutene homopolymer (PB-H) . 2
4.3 Polybutene random copolymer (PB-R) . 2
5 Expected strength . 5
5.1 General . 5
5.2 Extrapolation limits . 5
5.3 Graphical representation . 5
5.4 Tabulated values . 5
Annex A (normative) Demonstrating conformance of pipes to the reference lines . 8
Bibliography . 9
© ISO 2012 – All rights reserved iii
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ISO 12230:2012(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 12230 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 12230:1996), which has been technically revised.
iv © ISO 2012 – All rights reserved
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ISO 12230:2012(E)
Introduction
The development of new polybutene-1 compounds based on random copolymers called PB-R means there is
a need to rename the existing PB-1 homopolymer compounds PB-H. At the same time a new set of reference
lines and tabulated expected hoop strength values for various times and temperatures needs to be included.
The main changes since the previous edition of this International Standard are
— new definition of PB-1 compounds PB-H (homopolymer) and PB-R (copolymers),
— new set of reference lines (coefficients and diagram),
— new table containing calculated expected hoop strength values,
— recalculation of hoop strength data of PB-H and specifying values rounded down to one decimal place,
— clearer specification of showing conformance to reference lines, and
— conformance to reference lines can be shown by not failed data points running at sufficiently high
hoop stress, too.
© ISO 2012 – All rights reserved v
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INTERNATIONAL STANDARD ISO 12230:2012(E)
Polybutene-1 (PB-1) pipes — Effect of time and temperature on
the expected strength
1 Scope
This International Standard specifies minimum values for the expected strength as a function of time and
temperature in the form of reference lines and tabulated data, for use in calculations on pipes made of
— polybutene-1 homopolymer (PB-H), and
— polybutene-1 random copolymer (PB-R).
For the sake of simplicity the designation polybutene and the abbreviation PB are used throughout.
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
minimum long-term hydrostatic strength to be expected from a particular polymer
NOTE 1 Reference lines are not to be considered as characteristic of a specific grade or of material from a specific supplier.
NOTE 2 The lines are described by a mathematical equation which permits interpolation and extrapolation in an
...
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