Plastics piping systems for industrial applications - Poly(vinylidene fluoride) (PVDF) - Specifications for components and the system (ISO 10931:2005)

This International Standard specifies the  characteristics and requirements for  components such as pipes, fittings and  valves made from poly (vinylidene fluoride)  (PVDF), intended to be used for  thermoplastics piping systems in the field of  industrial applications above-ground. It is  applicable to PVDF pipes, fittings, valves  and ancillary equipment, their joints and to  joints with components of other plastics and  non-plastics materials, depending on their  suitability, intended to be used for the  conveyance of liquid and gaseous fluids as  well as of solid matters in fluids for  industrial applications including - chemical  plants, - industrial sewerage engineering, -  power engineering (cooling and general  purpose water), - electroplating and pickling  plants, - semiconductor industry, -  agricultural production plants, and - water  treatment. This International Standard is  applicable to PVDF piping systems for use  at temperatures up to 150 °C. However, for  applications above 120 °C, which depend  upon the crystalline melting point of the  PVDF material, it is advisable to seek the  advice of the manufacturer of the  component (the components have to  withstand the mechanical, thermal and  chemical demands to be expected and to  be resistant to the fluids to be conveyed).  Characteristics and requirements which are  applicable for PVDF in general are covered  by the relevant clauses of this International  Standard. Those characteristics and  requirements which depend on the material  used are given in Annex A.

Kunststoff-Rohrleitungssysteme für industrielle Anwendungen - Polyvinyliden Fluoride (PVDF) - Anforderungen an Rohrleitungsteile und das Rohrleitungssystem (ISO 10931:2005)

Diese Internationale Norm legt die Eigenschaften und Anforderungen an Rohrleitungsteile wie Rohre, Formstücke und Armaturen aus Polyvinylidenfluorid (PVDF) fest, die für die Anwendung in oberirdisch verlegten Industrierohrleitungen aus thermoplastischen Kunststoffen vorgesehen sind.
Sie gilt für Rohre, Formstücke, Armaturen und Zubehörteile aus PVDF, deren Verbindungen untereinander sowie mit Rohrleitungsteilen aus anderen Kunststoffen und Werkstoffen, die abhängig von ihrer Eignung für den Transport von flüssigen und gasförmigen Fluiden sowie von festen Bestandteilen in Fluiden für industrielle Anwendungen vorgesehen sind, einschließlich
-   chemische Industrieanlagen;
-   Industrieabwassertechnik;
-   Energietechnik (Kühl- und Brauchwasser);
-   Galvanisierungs- und Beizanlagen;
-   Halbleiterindustrie;
-   Futtermittelindustrie und
-   Kläranlagen.
Diese Internationale Norm gilt für Rohrleitungssysteme aus PVDF für Anwendungen bei bis zu 150 °C. Für Anwendungen bei über 120 °C, die vom kristallinen Schmelzpunkt des PVDF-Werkstoffes abhängig sind, sollte jedoch der Rat des Herstellers der Rohrleitungsteile eingeholt werden. (Die Rohrleitungsteile müssen gegen den zu erwartenden mechanischen, thermischen und chemischen Beanspruchungen widerstehen und gegenüber den transportierten Fluiden beständig sein.)
Eigenschaften und Anforderungen, die für PVDF allgemein gelten, sind in den entsprechenden Abschnitten dieser Internationalen Norm aufgeführt. Werkstoffspezifische Eigenschaften und Anforderungen sind im Anhang A festgelegt.

Systemes de canalisations en matieres plastiques pour les applications industrielles - Poly(fluorure de vinylidene) (PVDF) - Spécifications pour les composants et le systeme (ISO 10931:2005)

L'ISO 10931:2005 spécifie les caractéristiques et les exigences des composants tels que les tubes, les raccords et les robinets fabriqués à partir de poly(fluorure de vinylidène) (PVDF), destinés à être utilisés dans les systèmes de canalisations thermoplastiques pour les applications industrielles aériennes.

Cevni sistemi iz polimernih materialov za uporabo v industriji – Poli(viniliden florid) (PVDF) – Zahteve za dele cevovoda in cevni sistem (ISO 10931:2005)

General Information

Status
Published
Publication Date
31-Mar-2006
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Apr-2006
Due Date
01-Apr-2006
Completion Date
01-Apr-2006

Relations

Buy Standard

Standard
SIST EN ISO 10931:2006
English language
42 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 10931:2006
01-april-2006
Cevni sistemi iz polimernih materialov za uporabo v industriji – Poli(viniliden
florid) (PVDF) – Zahteve za dele cevovoda in cevni sistem (ISO 10931:2005)

Plastics piping systems for industrial applications - Poly(vinylidene fluoride) (PVDF) -

Specifications for components and the system (ISO 10931:2005)

Kunststoff-Rohrleitungssysteme für industrielle Anwendungen - Polyvinyliden Fluoride

(PVDF) - Anforderungen an Rohrleitungsteile und das Rohrleitungssystem (ISO
10931:2005)

Systemes de canalisations en matieres plastiques pour les applications industrielles -

Poly(fluorure de vinylidene) (PVDF) - Spécifications pour les composants et le systeme

(ISO 10931:2005)
Ta slovenski standard je istoveten z: EN ISO 10931:2005
ICS:
23.040.01
SIST EN ISO 10931:2006 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN ISO 10931
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2005
ICS 23.040.01
English Version
Plastics piping systems for industrial applications -
Poly(vinylidene fluoride) (PVDF) - Specifications for components
and the system (ISO 10931:2005)

Systèmes de canalisations en matières plastiques pour les Kunststoff-Rohrleitungssysteme für industrielle

applications industrielles - Poly(fluorure de vinylidène) Anwendungen - Polyvinyliden Fluorid - Anforderungen an

(PVDF) - Spécifications pour les composants et le système Rohrleitungsteile und das Rohrleitungssystem (ISO

(ISO 10931:2005) 10931:2005)
This European Standard was approved by CEN on 28 November 2005.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10931:2005: E

worldwide for CEN national Members.
---------------------- Page: 2 ----------------------
EN ISO 10931:2005 (E)
Foreword

This document (EN ISO 10931:2005) has been prepared by Technical Committee ISO/TC 138 "Plastics

pipes, fittings and valves for the transport of fluids" in collaboration with Technical Committee CEN/TC 155

"Plastics piping systems and ducting systems", the secretariat of which is held by NEN.

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by June 2006, and conflicting national standards shall be withdrawn at

the latest by June 2006.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland

and United Kingdom.
Endorsement notice

The text of ISO 10931:2005 has been approved by CEN as EN ISO 10931:2005 without any modifications.

---------------------- Page: 3 ----------------------
EN ISO 10931:2005 (E)
ANNEX ZA
(informative)
Relationship between this International Standard and the Essential
Requirements of EU Directive 97/23/EC (PED)

By agreement between ISO and CEN, this CEN annex is included in the DIS and the FDIS but will not

appear in the published ISO standard.

This International Standard has been prepared under a mandate given to CEN by the European Commission

and the European Free Trade Association to provide one means of conforming to Essential Requirements of

the New Approach Directive 97/23 EC, Pressure Equipment Directive (PED).

Once this standard is cited in the Official Journal of the European Communities under that Directive and has

been implemented as a national standard in at least one Member State, compliance with the normative

clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a

presumption of conformity with the corresponding Essential Requirements of that Directive and associated

EFTA regulations.

Table ZA.1 — Correspondence between this International Standard and Directive 97/23/EC (PED)

Clauses/subclauses of this Essential requirements (Ers) of Qualifying remarks/Notes

International Standard EU Directive 97/23/EC
5.2; 8.1; 14 Design for adequate strength 2.2.1
18 Traceability 3.1.5
A.1.2; A.3.1; A.5 Hydrostatic test pressure 3.2.2
5 Materials 4.1, 4.2 a)
14 Design of piping system 6 a), b), c)

WARNING: Other requirements and other EU Directives may be applicable to the product(s) falling within

the scope of this standard.
---------------------- Page: 4 ----------------------
INTERNATIONAL ISO
STANDARD 10931
First edition
2005-12-01
Plastics piping systems for industrial
applications — Poly(vinylidene fluoride)
(PVDF) — Specifications for components
and the system
Systèmes de canalisations en matières plastiques pour les applications
industrielles — Poly(fluorure de vinylidène) (PVDF) — Spécifications
pour les composants et le système
Reference number
ISO 10931:2005(E)
ISO 2005
---------------------- Page: 5 ----------------------
ISO 10931:2005(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but

shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In

downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat

accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation

parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In

the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO 2005

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2005 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 10931:2005(E)
Contents Page

Foreword............................................................................................................................................................ iv

Introduction ........................................................................................................................................................ v

1 Scope ..................................................................................................................................................... 1

2 Normative references ........................................................................................................................... 2

3 Terms and definitions........................................................................................................................... 3

4 Symbols and abbreviated terms ......................................................................................................... 6

5 Material .................................................................................................................................................. 7

6 General characteristics — Appearance.............................................................................................. 9

7 Geometrical characteristics................................................................................................................. 9

8 Mechanical characteristics ................................................................................................................ 10

9 Physical characteristics..................................................................................................................... 11

10 Chemical characteristics ................................................................................................................... 11

11 Electrical characteristics ................................................................................................................... 11

12 Performance requirements ................................................................................................................ 11

13 Classification of components............................................................................................................ 12

14 Design of a thermoplastics piping system for industrial applications ......................................... 12

15 Installation of piping systems ........................................................................................................... 13

16 Declaration of compliance with this International Standard.......................................................... 13

17 Marking ................................................................................................................................................ 13

18 Manufacture......................................................................................................................................... 15

Annex A (informative) Specific characteristics and requirements for industrial piping systems

made from poly(vinylidene fluoride) (PVDF).................................................................................... 16

Bibliography ..................................................................................................................................................... 34

© ISO 2005 – All rights reserved iii
---------------------- Page: 7 ----------------------
ISO 10931:2005(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 10931 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the

transport of fluids, Subcommittee SC 3, Plastics pipes and fittings for industrial applications.

This first edition of ISO 10931 cancels and replaces ISO 10931-1:1997, ISO 10931-2:1997, ISO 10931-3:1996,

ISO 10931-4:1997 and ISO 10931-5:1998, of which it constitutes a technical revision.

iv © ISO 2005 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 10931:2005(E)
Introduction

This International Standard specifies the characteristics and requirements for a piping system and its

components made from poly(vinylidene fluoride) (PVDF) intended to be used for industrial applications,

above-ground, by authorities, design engineers, certification bodies, inspection bodies, testing laboratories,

manufacturers and users.

At the date of publication of this International Standard, International Standards for piping systems of other

plastics used for industrial applications were ISO 15493, for acrylonitrile-butadiene-styrene (ABS),

unplasticized poly(vinyl chloride) (PVC-U), chlorinated poly(vinyl chloride) (PVC-C) and ISO 15494, for

polybutene (PB), polyethylene (PE), polypropylene (PP).
© ISO 2005 – All rights reserved v
---------------------- Page: 9 ----------------------
INTERNATIONAL STANDARD ISO 10931:2005(E)
Plastics piping systems for industrial applications —
Poly(vinylidene fluoride) (PVDF) — Specifications for
components and the system

IMPORTANT — Requirements for industrial valves are given in this International Standard and/or in

other International Standards. Valves may be used with components conforming to this International

Standard provided they conform additionally to its relevant requirements. Where existent, national

regulations for specific applications (e.g. water treatment) apply. Other application areas are permitted

if the requirements of this International Standard and/or applicable national requirements are fulfilled.

Relevant regulations in respect of fire behaviour and explosion risk are applicable if applications are

envisaged for inflammable media. Components conforming to any of the product standards listed in

the Bibliography or to national standards, as applicable, may be used with components conforming to

this International Standard, provided they conform to the requirements for joint dimensions and the

relevant requirements of this International Standard.
1 Scope

This International Standard specifies the characteristics and requirements for components such as pipes,

fittings and valves made from poly (vinylidene fluoride) (PVDF), intended to be used for thermoplastics piping

systems in the field of industrial applications above-ground.

It is applicable to PVDF pipes, fittings, valves and ancillary equipment, their joints and to joints with

components of other plastics and non-plastics materials, depending on their suitability, intended to be used for

the conveyance of liquid and gaseous fluids as well as of solid matters in fluids for industrial applications

including
⎯ chemical plants,
⎯ industrial sewerage engineering,
⎯ power engineering (cooling and general purpose water),
⎯ electroplating and pickling plants,
⎯ semiconductor industry,
⎯ agricultural production plants, and
⎯ water treatment.

This International Standard is applicable to PVDF piping systems for use at temperatures up to 150 °C.

However, for applications above 120 °C, which depend upon the crystalline melting point of the PVDF material,

it is advisable to seek the advice of the manufacturer of the component (the components have to withstand the

mechanical, thermal and chemical demands to be expected and to be resistant to the fluids to be conveyed).

Characteristics and requirements which are applicable for PVDF in general are covered by the relevant

clauses of this International Standard. Those characteristics and requirements which depend on the material

used are given in Annex A.
© ISO 2005 – All rights reserved 1
---------------------- Page: 10 ----------------------
ISO 10931:2005(E)
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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances

and designation

ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,

tolerances and designation

ISO 265-1, Pipes and fittings of plastics materials — Fittings for domestic and industrial waste pipes — Basic

dimensions: Metric series — Part 1: Unplasticized poly(vinyl chloride) (PVC-U)
ISO 472, Plastics — Vocabulary

ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special

characteristics

ISO 1167:1996, Thermoplastics pipes for the conveyance of fluids — Resistance to internal pressure — Test

method. Incorporating ISO 1167:1996/Cor 1:1997

ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient

column method

ISO 2505-1:1994, Thermoplastics pipes — Longitudinal reversion — Part 1: Determination methods

ISO 2505-2:1994, Thermoplastics pipes — Longitudinal reversion — Part 2: Determination parameters

ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions

ISO 4065, Thermoplastics pipes — Universal wall thickness table

ISO 9080:2003, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of

thermoplastics materials in pipe form by extrapolation

ISO/TR 10358, Plastics pipes and fittings — Combined chemical-resistance classification table

ISO 11357-3, Plastics — Differential scanning calorimetry (DSC) — Part 3: Determination of temperature and

enthalpy of melting and crystallization

ISO 11922-1:1997, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:

Metric series

ISO 12092:2000, Fittings, valves and other piping system components made of unplasticized poly(vinyl

chloride) (PVC-U), chlorinated poly(vinyl chloride) (PVC-C), acrylonitrile-butadiene-styrene (ABS) and

acrylonitrile-styrene-acrylester (ASA) for pipes under pressure — Resistance to internal pressure — Test

method

ISO 15853:1999, Thermoplastic materials — Preparation of tubular test pieces for the determination of the

hydrostatic strength of materials used for injection moulding

ISO 12162:1995, Thermoplastics materials for pipes and fittings for pressure applications — Classification and

designation — Overall service (design) coefficient
2 © ISO 2005 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 10931:2005(E)
ISO 16135, Industrial valves — Ball valves of thermoplastics materials
1)
ISO 16136, Industrial valves — Butterfly valves of thermoplastics materials
1)
ISO 16137, Industrial valves — Check valves of thermoplastics materials
1)
ISO 16138, Industrial valves — Diaphragm valves of thermoplastics materials
1)
ISO 16139, Industrial valves — Gate valves of thermoplastics materials
ISO 21787, Industrial valves — Globe valves of thermoplastics materials

IEC 60364-1, Electrical installations of buildings — Part 1: Scope, object and fundamental principles

IEC 60449, Voltage bands for electrical installations of buildings
IEC 60529, Degrees of protection provided by enclosures (IP-code)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 472 and ISO 1043-1, and the

following apply.
3.1 Geometrical definitions

NOTE The symbols d and e correspond to d and e given in other International Standards such as ISO 11922-1.

e ey y
3.1.1
nominal outside diameter

specified outside diameter of a component which is identical to the minimum mean outside diameter, d ,

em,min
in millimetres

NOTE The nominal inside diameter of a socket is equal to the nominal outside diameter of the corresponding pipe.

3.1.2
outside diameter at any point

measured outside diameter through the cross-section at any point of a pipe or the spigot end of a fitting,

rounded up to the next 0,1 mm
3.1.3
mean outside diameter

measured length of the outer circumference of a pipe or the spigot end of a fitting divided by π (≈ 3,142),

rounded up to the next 0,1 mm
3.1.4
mean inside diameter of a socket
arithmetical mean of two measured inside diameters perpendicular to each other
1) To be published.
© ISO 2005 – All rights reserved 3
---------------------- Page: 12 ----------------------
ISO 10931:2005(E)
3.1.5
nominal size of flange

numerical designation of the size of a flange, used for reference purposes and related to the manufacturing

dimension in millimetres
3.1.6
out-of-roundness

〈pipe/spigot end of fitting〉 difference between the measured maximum outside diameter and the measured

minimum outside diameter in the same cross section of a pipe or the spigot end of a fitting

3.1.7
out-of-roundness

〈socket〉 difference between the measured maximum inside diameter and the measured minimum inside

diameter in the same cross section of a socket
3.1.8
nominal wall thickness
wall thickness, in millimetres, corresponding to the minimum wall thickness, e
min
3.1.9
wall thickness at any point

measured wall thickness at any point around the circumference of a component, rounded up to the next

0,1 mm
3.1.10
pipe series S

dimensionless number related to the nominal outside diameter, d , and the nominal wall thickness, e

n n

NOTE 1 The pipe series S is related to a given pipe geometry as shown in Equation (1):

de−
S = (1)
NOTE 2 Flanges are designated on the basis of PN.
3.1.11
standard dimension ratio
SDR

ratio of the nominal outside diameter, d , of a pipe to its nominal wall thickness, e

n n

NOTE According to ISO 4065, the standard dimension ratio, SDR, and the pipe series S are related as shown in

Equation (2):
SDR = 2S + 1 (2)
3.2 Material definitions
3.2.1
virgin material

material in a form such as granules or powder that has not been subjected to use or processing other than

that required for its manufacture and to which no reprocessable or recyclable materials have been added

4 © ISO 2005 – All rights reserved
---------------------- Page: 13 ----------------------
ISO 10931:2005(E)
3.2.2
own reprocessable material

material prepared from rejected unused pipes, fittings and valves, including trimmings from the production of

pipes, fittings and valves, that will be reprocessed in a manufacturer's plant after having been previously

processed by the same manufacturer by a process such as moulding or extrusion and for which the complete

formulation or material specification is known

NOTE Only those thermoplastics parts of valves made from material conforming to this International Standard are

used.
3.3 Definitions related to material characteristics
3.3.1
lower confidence limit
LCL

quantity, expressed in megapascals, which can be considered as a material property, representing the 97,5 %

lower confidence limit of the predicted long-term hydrostatic strength for water at a given temperature, T, and

time, t
3.3.2
minimum required strength
MRS

value of σ for water at 20 °C for 50 years, rounded to the next lower value of the R10 series when σ is

LCL LCL

less than 10 MPa, or to the next lower value of the R20 series when σ is W 10 MPa

LCL
NOTE The R10 and R20 series are given in ISO 3 and ISO 497.
3.3.3
design stress
allowable stress, in megapascals, for a given application or service condition

NOTE It is derived by dividing the MRS by the coefficient C, as given in Equation (3), then rounding to the next lower

value of the R10 series or R 20 series, as applicable:
MRS
σ = (3)
3.3.4
overall service coefficient
design coefficient

overall coefficient with a value greater than one which takes into consideration service conditions as well as

the properties of the components of a piping system other than those represented in the lower confidence limit,

LCL
3.4 Definitions related to service conditions
3.4.1
nominal pressure

numerical designation used for reference purposes related to the mechanical characteristics of the

components of a piping system

NOTE 1 A pressure, in bar, with the numerical value of PN is identical to the pressure, p , as defined by

EU Directive 97/23/ECC (PED), if both pressures are taken at 20 °C.
© ISO 2005 – All rights reserved 5
---------------------- Page: 14 ----------------------
ISO 10931:2005(E)

NOTE 2 For plastics piping systems conveying water, it corresponds to the maximum continuous operating pressure, in

bar, which can be sustained for water at 20 °C for 50 years, based on the minimum overall service/design coefficient and

calculated using Equation (4):
10σσ20
PN= = (4)
SSDR−1
where
σ is the design stress, expressed in newtons per square millimetre;
PN is expressed in bar .
3.4.2
hydrostatic stress

stress induced in the wall of a pipe when an internal hydrostatic pressure is applied

NOTE The hydrostatic stress, in megapascals, is related to the applied internal hydrostatic pressure, p, the wall

thickness, e, at any point and the mean outside diameter, d , of a pipe and calculated using Equation (5):

de−
σ= p (5)
NOTE Equation (5) is applicable for pipes only.
3.4.3
long-term hydrostatic stress

constant hydrostatic stress that is maintained in a component during a sustained period of time

4 Symbols and abbreviated terms
4.1 Symbols
C overall service (design) coefficient (design factor)
d nominal outside diameter of the test piece
d outside diameter (at any point)
d mean outside diameter
d nominal outside diameter
DN nominal size of flange
e wall thickness (at any point)
e nominal wall thickness
l free length
p internal hydrostatic pressure
p maximum allowable pressure
2 5 2
2) 1 bar = 0,1 MPa = 0,1 N/mm = 10 N/m .
6 © ISO 2005 – All rights reserved
---------------------- Page: 15 ----------------------
ISO 10931:2005(E)
T temperature
t time
ρ material density
σ hydrostatic stress
σ lower confidence limit
LCL
σ design stress
4.2 Abbreviations
MOP maximum operating pressure
MRS minimum required strength
PN nominal pressure
PS maximum allowable pressure
PT test pressure
PVDF poly(vinylidene fluoride)
S pipe series S
SDR standard dimension ratio
5 Material
5.1 General
The PVDF material from which the components are made shall be homopolymer resin.

NOTE Only homopolymers are covered by this edition of ISO 10931. It is intended that copolymer materials also be

covered at a later date.
5.2 Hydrostatic strength properties

The material shall be evaluated according to ISO 9080 where a pressure test is carried out according to

ISO 1167 to find the MRS value in accordance with ISO 12162. The test shall be carried out using test pieces

of pipe series S u 10.

Conformity of PVDF to the reference curves given in Annex A shall be proved according to that annex. At

least 97,5 % of the data points shall be on or above the reference curves.
The material shall be classified by the raw material producer.

Where fittings and valves are manufactured from the same material as pipes, the material classification shall

be the same as for pipes.

For the classification of a material intended only for the manufacture of fittings and valves, the test piece shall

be an injection-moulded or extruded test piece in the form of a pipe (see Figure 1) where a test pressure is

applied according to ISO 1167. The free length l shall be 3d , as defined in ISO 15853.

0 n
© ISO 2005 – All rights reserved 7
---------------------- Page: 16 ----------------------
ISO 10931:2005(E)
Key
1 end cap
2 injection-moulded end
Figure 1 — Free length l of test pieces
5.3 Material characteristics
The details of the material characteristics of PVDF are given in Annex A.
5.4 Reprocessable and recyclable material

The use of own reprocessable material obtained during the production and testing of components according to

this International Standard is permitted in addition to virgin material, provided that the requirements of this

International Standard are fulfilled.

Reprocessable material obtained from external sources and recyclable material shall not be used.

5.5 Materials for parts not made from PVDF
5.5.1 General

All components shall conform to the relevant International Standard(s). Alternative standards may be applied

in cases where a suitable International Standar
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.