INTERNATIONAL ISO

STANDARD 12162
First edition
1995-06-01

Thermoplastics materials for pipes and

fittings for pressure applications -
Classification and designation - Overall
iTeh Service (design)
STANDARD coefficient
PREVIEW
(standards.iteh.ai)
Matieres thermoplastiques pour tubes et raccords pour applications avec
PressionISO Classifica tion et d&igna tion - Coefficient global de Service
- 12162:1995
(de calcul)
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9964-ea467dbddf31/iso-12162-1995

Reference number
ISO 12162:1995(E)
ISO 12162:1995(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. Esch 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.

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. iTeh STANDARD PREVIEW
International Standard (standards.iteh.ai)
ISO 12162 was prepared by Technical Committee
lSO/TC 138, Plastics pipes, fittings and valves for the transport of fluids,
Subcommittee SC 5, Genera/ properties of pipes, fittings ISO 12162:1995
and valves of
plastic materials and their accessories - Test methods and basic specifi-
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ca tions. 9964-ea467dbddf31/iso-12162-1995

0 ISO 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland

ii
 0 ISO ISO 12162:1995(E)

Introduction
ISO/TR 9080 states in 0.2.7 of its introduction that methods for using
OLTHS and/or aLCL to arrive at the allowable design Stresses still had to be
considered. Service factors or safety factors have to be introduced.
This International Standard uses the lower confidence limit of the long-
term strength, aLCL, as a basis for material classification and designation
and defines the relation with the design stress. The Service factors are
expressed in the Overall Service (design) coefficient. The final Overall ser-
vice (design) coefficients are given in the product or System Standards.

iTeh STANDARD PREVIEW

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ISO 12162:1995
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INTERNATIONAL STANDARD 0 ISO ISO 12162:1995(E)

Thermoplastics materials for pipes and fittings for

pressure applications - Classification and
designation - Overall Service (design) coefficient

1 Scope lSO/TR 9080:1992, Thermoplastics pipes for the

transport of fluids - Methods of extrapolation of
This International Standard establishes the classi- hydrostatic stress rupture data to determine the
fication of thermoplastics materials in pipe form and long-term hydrostatic strength of thermoplastics pipe
specifies the material designation. lt also gives a ma terials.
method for calculating the design stress.
iTehfor STANDARD
lt applies to materials intended pipes and/or fit-
3PREVIEW
Definitions
tings for pressure applications.
(standards.iteh.ai)For the purposes of this International
following definitions apply.
Standard, the
The classification, the material designation, and the
calculation method are based on the resistance ISO 12162:1995
to 3.1 lang-term strength at 20 “C for 50 years,
https://standards.iteh.ai/catalog/standards/sist/83dd0dba-7838-4330-
internal pressure with water at 20 “C in water for
OLTHS’ Quantity with the dimensions of stress, in
50 years, derived by extrapolation using 9964-ea467dbddf31/iso-12162-1995
the method megapascals, which tan be considered as a property
given in lSO/TR 9080. of the material and represents the 50 % lower confi-
dence limit for the Iong-term strength. lt is equal to
the mean strength or predicted mean strength at
20 “C for 50 years with internal pressure with water.
2 Normative references
3.2 lower confidence limit at 20 “C for 50 years,
The following Standards contain provisions which, aLcL: Quantity with the dimensions of stress, in
through reference in this text, constitute provisions megapascals, which tan be considered as a property
of this International Standard. At the time of publi- of the material and represents the 97,5 % lower con-
cation, the editions indicated were valid. All Standards fidence limit of the mean long-term strength at 20 “C
are subject to revision, and Parties to agreements for 50 years with internal pressure with water.
based on this International Standard are encouraged
to investigate the possibility of applying the most re- 3.3 minimum required strength, MRS: Value of
cent editions of the Standards indicated below. aLCL, rounded down to the next smaller value of the
Members of IEC and ISO maintain registers of cur- RIO series or of the R20 series conforming to ISO 3
rently valid International Standards. and ISO 497, depending on the value of aLCL.

ISO 3: 1973, Preferred numbers - Series of preferred 3.4 Overall Service (design) coefficient, C: Overall
numbers. coefficient with a value greater than 1, which takes
into consideration Service conditions as well as
ISO 497: 1973, Guide to the choice of series of pre- properties of the components of a piping System
ferred numbers and of series containing more other than those represented in the lower confidence
rounded values of preferred numbers. limit.

ISO 1043-1 :1987, Plastics - Symbols - Part 7: NOTE 1 Minimum values of C for various materials are
Basic polymers and their special characteristics. given in clause 5.

1
ISO 12162:1995(E) 0 ISO

3.5 design stress, 0,: Allowable stress for a given values of its aLCL, rounded down to the next smaller
application. lt is derived by dividing the MRS by the value of the RIO series when aLCL is less than
coefficient C, then rounding to the next lower value 10 MPa or to the next smaller value of the R20 series
in the R20 series, i.e. when aLCL is greater than or equal to 10 MPa. This
value constitutes the MRS.
as= WS1
c The classification number for a thermoplastics ma-
terial shall be 10 times the MRS expressed in
4 Classification of materials in pipe form megapascals (see table 1).

A thermoplastics material shall be classified by the

Table 1 - Classification
Range of lower Minimum required
Classification numberl)
confidence limits strength
%CL MRS
MPa MPa
1 G aLCL~ 1,24 1 10
iTeh STANDARD
1,25< aLcL< 1,59
1,6< qCL< W9 15
PREVIEW 1,25 12.5
16
2 \< qCL<
2,5< qcL< 33
(standards.iteh.ai)
z49 2
2,5
20
25

3,156 aLcL< 3,99 ISO3,1512162:1995 31.5

46 q-CL<https://standards.iteh.ai/catalog/standards/sist/83dd0dba-7838-4330-
499 4 40
5~ qCL< 629 5
9964-ea467dbddf31/iso-12162-1995 50
6% qC,+ 739 6,3 63
8~ qCL< 399 8 80

IO< q(--< 11,19 10 100

11,2< q& 12,49 11,2 112
12,5< aLCL< 13,99 12,5 125
14< qcL< 15,99 14 140
16~ cqCL< 17,99 16 160

18~ cqCL< 19,99 18 180

206 cTLCL<22,39 20 200
22,4< aLCL< 24,99 22,4 224
256 qCL< 27,99 25 250
286 aLCL< 31,49 28 280

31,5< op--< 35,49 31,5 315

35,5< qCL< 39,99 35,5 355
40< qcL< 44,99 40 400
45< aLcL< 49,99 45 450
50< qcL< 54,99 50 500

1) If the classification number is not an integer, a full stop is used instead of a

comma.
0 ISO ISO 12162:1995(E)

5 Setting of C values in the product 6 Calculation of design stress

(System) Standards
Unless otherwise specified in the product (System)
Standards, the design stress, Q, shall be calculated
using the following equation and rounded to the next
lowest value in the R20 series:

The value(s) of C (see 3.4) is (arc) specified in the ap- 0, = [MRSI

C
plicable product (System) Standard.

The value(s) of C at 20 “C shall be equal to or, if ap- where

propriate, greater than the minimum value given in
[MRS] is the value of the minimum required
table2, which is established for static water pressure
strength (see 3.3);
at 20 “C for 50 years, to take account of the following
considerations: C is the applicable value of C, in accordance
with clause 5.
a) specific requirements for the products, such as
additional Stresses and other unquantifiable ef-
fects which are considered to arise in the appli- 7 Designation of materials in pipe form
cation, for example dynamic loading;
The designation shall be given by a combination of the
b) the influence of temperature, time and environ- following:
ment inside or outside the pipe if different from
- the Symbol of the material in accordance with
20 “C, 50 years and water respectively;
ISO 1043-1;
c) iTeh STANDARD -PREVIEW
Standards relating to the MRS, for temperatures
its classification number in accordance with
other than 20 “C.
(standards.iteh.ai) 4.
clause
The minimum values of C (see 3.4) for various ma-
terials are given in table2. ISO 12162:1995EXAMPLE
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A PVC-U with an MRS of 25 MPa is designated as
9964-ea467dbddf31/iso-12162-1995
follows:

Table 2 - Minimum values of C PVC-U 250

C
Material
min. 8 Marking
ABS 15 Unless otherwise specified in the product (System)
PB 1,25 Standards, the tubes and fittings shall be marked with
PE (all types) 1,25
the following information:
PE-X 1,25
PP copolymer 1,25
- the type and class of the material in accordance
PP homopolymer 116
PVC-c L6 with the designation specified in clause 7;
PVC-H I 1,4
PVC-u 1,6 and, for fittings,
PVDF copolymer 19
PVDF homopolymer W - whether the material was tested in extruded or
injection moulded pipe form.
ISO 12162:1995(E)

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ICS 23.040.20; 23.040.45

Descriptors: plastics, plastic tubes, pressure pipes, pipe fittings, thermosetting materials, classification, designation, marking.

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