Bsi bs en 00712 1995 (1999)

BRITISH STANDARD BS EN 712 1995 BS 2782 11 Method 1123H 1995 Thermoplastics piping systems — End load bearing mechanical joints between pressure pipes and fittings — Test method for resistance to pull[.]

BS 2782-11: Method 1123H:1995

Thermoplastics piping

systems —

End-load bearing

mechanical joints

between pressure pipes

and fittings —

Test method for

resistance to pull-out

under constant

longitudinal force

The European Standard EN 712:1993 has the status of a

British Standard

UDC 621.643.4-036:621.643.2.06:620.172

BS EN 712:1995

This British Standard, having

been prepared under the

direction of the Sector Board for

Materials and Chemicals, was

published under the authority of

the Standards Board and comes

into effect on

15 May 1995

© BSI 10-1999

The following BSI references

relate to the work on this

standard:

Committee reference PRI/61

Draft for comment 92/41352 DC

ISBN 0 580 23965 9

Committees responsible for this British Standard

The preparation of this British Standard was entrusted to Technical Committee PRI/61, Plastics piping systems and components, upon which the following bodies were represented:

British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers’ Association British Valve and Actuator Manufacturers’ Association Department of the Environment (British Board of Agrément) Department of the Environment (Building Research Establishment) Department of the Environment (Property and Buildings Directorate) Department of Transport

Electricity Association Federation of Civil Engineering Contractors Health and Safety Executive

Institute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engineers Institution of Water and Environmental Management National Association of Plumbing, Heating and Mechanical Services Contractors

Pipeline Industries Guild Plastics Land Drainage Manufacturers’ Association Society of British Gas Industries

Society of British Water Industries Water Companies Association Water Services Association of England and Wales The following bodies were also represented in the drafting of this standard, through subcommittees and panels:

Engineering Equipment and Materials Users’ Association ERA Technology Ltd

RAPRA Technology Ltd

Amendments issued since publication

© BSI 10-1999 i

Contents

Page

BS EN 712:1995

National foreword

This British Standard has been prepared by Technical Committee PRI/61 and is

the English language version of EN 712:1993 Thermoplastics piping systems —

End-load bearing mechanical joints between pressure pipes and fittings — Test method for resistance to pull-out under constant longitudinal force, published by

the European Committee for Standardization (CEN)

It is incorporated into BS 2782 Methods of testing plastics —

Part 11: Thermoplastics pipes, fittings and valves, as Method 1123H:1995 for

association with related test methods for plastics materials and plastics piping components

This test method has been prepared for reference by other standards under preparation by CEN for specification of plastics piping systems and components

It has been implemented to enable experience of the method to be gained and for use for other fresh applications

It is also for use for the revision or amendment of other national standards as practicable, but it should not be presumed to apply to any existing standard or specification which contains or makes reference to a different test method until that standard/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate

WARNING This British Standard, which is the English language version of

EN 712:1993, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc Act 1974 Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel

A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4 and a back cover

This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover

EUROPÄISCHE NORM November 1993

UDC 621.643.4-036:621.643.2.06:620.172

Descriptors: Pipelines, pipes, pressure pipes, plastics pipes, pipe fitting, joint, pull-out, tensile strength, tests

English version Thermoplastics piping systems — End-load bearing mechanical joints between pressure pipes and fittings — Test method for resistance to pull-out under constant

longitudinal force

Systèmes de canalisations thermoplastiques —

Assemblages mécaniques avec effet des fonds

entre tubes avec pression et raccords —

Méthode d’essai de résistance à

l’arrachement sous force constante

Thermoplastische Rohrleitungssysteme — Zugfeste mechanische Verbindungen zwischen Druckrohren und Formstücken —

Prüfverfahren für den Widerstand gegen Herausziehen unter konstanter Belastung

This European Standard was approved by CEN on 1993-11-25 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom

CEN

European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

© 1993 Copyright reserved to CEN members

Ref No EN 712:1993 E

EN 712:1993

Foreword

This standard was prepared by CEN/TC 155,

Plastics piping systems and ducting systems

This standard is based on the International

Standard ISO 3501:1976 Assembled joints between

fittings and polyethylene (PE) pressure pipes — Test

of resistance to pull-out, published by the

International Organization for Standardization

(ISO) It is a modification of ISO 3501:1976 for

reasons of applicability to other plastics materials

and/or other test conditions and alignment with

texts of other standards on test methods

The modifications are:

— no specific material is mentioned;

— no diameter limit is given;

— no material-dependent requirements are

given;

— editorial changes have been introduced

The material-dependent parameters and/or

performance requirements are incorporated in the

system standard(s) concerned

No existing European Standard is superseded by

this standard

This standard is one of a series of standards on test

methods which support system standards for

plastics piping systems and ducting systems

This standard has been prepared under a mandate

given to CEN by the Commission of the European

Communities and the European Free Trade

Association, and supports essential requirements of

the EC Directive(s)

This standard has been prepared under a mandate

given to CEN by the Commission of the European

Communities and the European Free Trade

Association, and supports essential requirements of

the EC Directive(s)

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 May 1994, and conflicting national standards

shall be withdrawn at the latest by May 1994

The standard was approved and, in accordance with

the following CEN/CENELEC Internal Regulations,

the following countries are bound to implement this

European Standard: Austria, Belgium, Denmark,

Finland, France, Germany, Greece, Iceland,

Ireland, Italy, Luxembourg, Netherlands, Norway,

Portugal, Spain, Sweden, Switzerland,

United Kingdom

© BSI 10-1999 3

1 Scope

This standard specifies a method for checking the

ability of assembled end-load bearing mechanical

joints (excluding fusion-welded joints) between

fittings and pressure pipes to withstand a

longitudinal tensile force

2 Principle

An assembled joint is subjected to a longitudinal

tensile force calculated as a function of the pipe

dimensions and the maximum permissible induced

hoop stress of the relevant pipe

NOTE It is assumed that the following test parameters are set

by the standard making reference to this standard:

a) the maximum permissible induced hoop stress (B t (see 5.2)

or, if applicable, the relevant basis for establishing the

pull-out force F (see 5.1);

b) the test temperature T (see 5.2) in degrees Celsius;

c) the maximum diameter to which the test method is applicable and requirements set.

3 Apparatus

3.1 tensometer, capable of holding the test piece at a

constant longitudinal stress or a device by which the

calculated force (see clause 5) may be applied to the

test piece by means of weights (see Figure 1) In the

second case the test piece shall be suspended on a

frame with a suitable stirrup at the lower end of the

test piece to hold the weights

4 Test piece

The test piece shall consist of the fitting to be tested

assembled with one or more pieces of pipe of the size

and type for which the fitting is designed

Each piece of pipe shall be at least 200 mm in

length

The assembly of the joint shall be carried out in

accordance with the manufacturer’s instructions

Pipes and fittings to be assembled shall be at

least 24 h old

NOTE Certain materials, e.g polybutylene, may require longer

periods before test.

5 Procedure

5.1 Unless the pull-out force F, or its derivation is

otherwise specified by the referring standard, from the dimensions of the pipe, calculate the area of the cross section of the pipe wall, and from this figure

calculate the force, F, in newtons, necessary to

produce a longitudinal stress of one and a half times the maximum permissible induced hoop stress, Bt, for the material from which the pipe is made, using the following equation:

F = 1,5 Ï emBt(dn– em) where

Secure the test piece in the apparatus

Apply the calculated force, F, gradually over a

period of 30 s

Hold the test piece in constant tension and at the specified temperature for a period of at least 1 h Inspect the joint(s) for and record any indications of loosening of the joint or partial or complete

separation from the fitting by pull-out

5.2 Unless otherwise specified in the referring standard, Bt shall be the maximum permissible induced hoop stress when subjected to water under pressure at (20 ± 2) °C for 50 years

6 Test report

The test report shall include the following information:

a) a reference to this standard and to the relevant referring standard;

b) the identity of the components [fitting, pipe(s)] comprising the joint under test;

c) the calculated force F in newtons;

d) the test temperature T in degrees Celsius;

e) the maximum permissible induced hoop stress, Bt;

f) a report of separation of the pipe from the fitting by pull-out, if this occurred, or otherwise a declaration that the joint was not pulled out, together with a report of any signs of loosening of

or leakage from the joint, if applicable;

g) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard;

h) the date of test

Bt is the maximum permissible induced stress, in megapascals, for the relevant

pipe, as specified in 5.2;

dn is the nominal outside diameter of the pipe, expressed in millimetres;

em is the mean wall thickness calculated from six values comprising four positions equally spaced around the circumference

of the pipe plus the maximum and the minimum wall thickness

Figure 1 — Diagram of typical apparatus

BS EN

712:1995

BS 2782-11:

Method

1123H:1995

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