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BRITISH STANDARD BS EN

626-2:1996 +A1:2008

Safety of machinery — Reduction of risk to health from hazardous substances emitted by machinery —

Part 2: Methodology leading to verification procedures

ICS 13.110

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This British Standard was

published under the

authority of the

Standards Board and

comes into effect

on 15 December 1996

© BSI 2008

The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the CEN amendment For example, text altered by CEN amendment A1 is indicated by !"

The UK participation in its preparation was entrusted to Technical Committee MCE/3, Safeguarding of machinery

A list of organizations represented on this committee can be obtained on request to its secretary

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

Compliance with a British Standard cannot confer immunity from legal obligations.

Amendments/corrigenda issued since publication

Date Comments

30 November 2008 Implementation of CEN amendment A1:2008

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

June 2008

English Version

Safety of machinery - Reduction of risk to health from hazardous substances emitted by machinery - Part 2: Methodology leading

to verification procedures

Sécurité des machines - Réduction du risque pour la santé

résultant de substances dangereuses émises par les machines - Partie 2: Méthodologie menant à des

procédures de vérification

Sicherheit von Maschinen - Reduzierung des Gesundheitsrisikos durch Gefahrstoffe, die von Maschinen ausgehen - Teil 2: Methodik beim Aufstellen von

Überprüfungsverfahren

This European Standard was approved by CEN on 20 June 1996 and includes Amendment 1 approved by CEN on 18 May 2008

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 CEN Management Centre 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 CEN Management Centre has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

EUROPEAN COMMITTEE FOR STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G

Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2008 CEN All rights of exploitation in any form and by any means reserved

worldwide for CEN national Members

Ref No EN 626-2:1996+A1:2008: E

Contents Page

Foreword 3

Introduction 4

1 Scope 4

2 Normative references 4

3 Methodology 5

4 Verification 6

Annex A (normative) Flow diagram leading to verification procedures 7

Annex B (informative) Examples of types of emission and how to assess them 8

Annex C (informative) Examples of relevant factors and their indicative parameters 9

Annex ZA (informative) !!!Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC""" 10

Annex ZB (informative) !!!Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC""" 11

EN 626-2:1996+A1:2008 (E)

3

Foreword

This document (EN 626-2:1996+A1:2008) has been prepared by Technical Committee CEN/TC 114 “Safety of machinery”, the secretariat of which is held by DIN

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 December 2008, and conflicting national standards shall be withdrawn

at the latest by December 2008

This document includes Amendment 1, approved by CEN on 2008-05-18

This document supersedes EN 626-2:1996

The start and finish of text introduced or altered by amendment is indicated in the text by tags ! "

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 Annexes ZA and ZB, which are integral parts 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, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

BS EN 626-2:1996+A1:2008

Introduction

This European Standard is one of a group of standards produced by CEN/CENELEC under mandates from CEC and EFTA This group has been divided into several categories to avoid duplication and to develop a logical structure which will enable rapid production of standards and easy cross reference between them The hierarchy of standards is as follows:

a) Type A standards (generic safety standards) giving basic concepts, principles for design and general

aspects that can be applied to all machinery;

b) Type B standards (group safety standards) dealing with one safety aspect or one type of safety related

device that can be used across a wide range of machinery:

 Type B1 standards on particular safety aspects (e.g safety distances, surface temperature, noise);

 Type B2 standards on safety related devices (e.g two-hand controls, interlocking devices, pressure sensitive devices, guards);

c) Type C standards (machine safety standards) giving detailed safety requirements for a particular

machine or group of machines

This is a type B1 standard and its primary purpose is to give guidance to the writers of type C standards when machines are identified as having emission of hazardous substances as a significant risk This standard may also be used as a guide in controlling the risk where there is no type C standard for a particular machine This standard may also be used to assist designers and manufacturers to identify sources of emission which may subsequently affect the exposure of operators and others

This standard also provides type C standard writers with guidance to enable the development of procedures relating to verification Such procedures are required to take account of the health risks associated with the emission of hazardous substances at all stages in the life of a machine (see 3.11 of EN 292-1:1992 and clause 4 of EN 626-1:1994)

1 Scope

This standard defines a procedure which leads to the selection of critical factors relating to emissions of hazardous substances for the purpose of specifying suitable verification procedures

This standard is to be used in conjunction with EN 626-1

2 Normative references

This European Standard incorporates, by dated or undated reference, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions of any of these publications apply to apply to this European Standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies

EN 292-1:1992, Safety of machinery, basic concepts, general principles for design — Part 1: Basic

terminology, methodology

EN 626-2:1996+A1:2008 (E)

5

EN 626-1:1994, Safety of machinery, reduction of risk to health from hazardous substances emitted by

machinery — Part 1: Principles and specifications for machinery manufacturers

prEN 1093-1, Safety of machinery, evaluation of the emission of airborne hazardous substances – Part 1:

Selection of test methods

3 Methodology

This clause defines the steps that shall be taken to lead to a verification procedure

NOTE These steps are summarised in annex A

3.1 Identification of hazardous substances

3.1.1 Identify substances which may be emitted during the intended use of the machine (see EN 292-1 and

clause 4 of EN 626-1:1994)

3.1.2 Determine which of these substances are hazardous to health and the nature of the hazard (see 3.2 of

EN 626-1:1994)

3.1.3 Where a number of substances have been identified, the verification procedure should be carried out

on key substances which represent worst case properties Key substances may be selected based on toxicity, corrosive properties, solvent properties, dustiness, etc

3.2 Characterisation of emissions

For all significant emissions of substances identified by 3.1.3 establish:

 The likely quantity or scale of emission under all foreseeable circumstances at all stages in the life of a machine;

NOTE 1 Amounts may be characterised by one of a number of assessment techniques (see annex B)

 The location and direction of the emission with respect to the machine and the likely position of persons;

 When the emission is likely to occur;

NOTE 2 This should relate to the likely presence of persons and the operating cycle of the machinery

 The physical characteristics of the emission, e.g phase, velocity, temperature, pressure;

 Whether it is likely to create an airborne emission or surface contamination

3.3 Identification of critical factors

3.3.1 Identify any relevant factor which causes an emission and on which the method of reduction is based

NOTE Relevant factors may be related to materials, energy or machine design or performance; examples are given

in annex C

BS EN 626-2:1996+A1:2008

3.4.1 Establish indicative parameters, which may be qualitative, related directly to the critical factors

identified

NOTE Examples are given in annex C

3.4.2 Specify the value, range of values, condition or state of the indicative parameter required to reduce

emission

4 Verification

4.1 Verification is carried out by collection of data relating to the indicative parameters

4.2 Verification may include results from field testing, laboratory testing, measurements, examination or calculations

4.3 A number of general test methods, which can be used as part of verification, are described in prEN 1093-1 and the following parts which are under preparation More detailed test conditions for a specific type or group of machines may be given in type C standards

EN 626-2:1996+A1:2008 (E)

7

Annex A

(normative)

Flow diagram leading to verification procedures

Table A.1

Clause Sequence of steps Examples

3.1 Identify hazardous substances  identify stage in life of the machine;

 identify the hazardous properties

3.2 Characterise emissions  likely quantity or scale of emission;

 location of persons and direction of emissions;

 when the emission is likely to occur;

 physical characteristics; phase (e.g.: gas), temperature;

 airborne or surface contamination

3.3.1 Identify relevant factors  Materials: dustiness, usage rates, production rates;

 Energy used: type;

 Machine design: ergonomics; distances;

automation;

 Performance: efficacy

3.3.2 Select critical factors Factors which most influence the emission of

hazardous substances; prioritize these to assist selection of indicative parameters

3.4.1 Specify indicative parameters  Quantitative: obtained by measurements or

calculations;

 Qualitative: information obtained by e.g visual inspection; visualisation techniques, design details 3.4.2 Set parameter values, ranges,

conditions or states

Requirements to give performance which reduces emissions

4 Specify verification

procedures

 Specify information which relates to the specified indicative parameters;

 Evidence from field/laboratory tests, measurements, visual inspections or calculations, technical construction file

BS EN 626-2:1996+A1:2008

Examples of types of emission and how to assess them

Table B.1

Type of emission Examples of assessment techniques

Nil or insignificant  Visual inspection;

 Smoke tests;

 Tyndall beam lamp;

 Pressure testing

Localized  Component performance;

 Local concentration assessment

Total (possibly multi-point emissions)  Calculation from mass balance;

 Test data

EN 626-2:1996+A1:2008 (E)

9

Annex C

(informative)

Examples of relevant factors and their indicative parameters

Table C.1 Category Relevant factors Indicative parameters

Feed rates, discharge rates

Mass rate (kg h-1); linear rate (mm min-1); resultant airborne concentrations (mg m-3)

Feed forms Dusty or solid, viscous, non-viscous or volatile liquids

Materials

Process timing Feed times (min)

Thermal Temperature control (range °C);

Rate of temperature rise or fall (°C min-1);

Product discharge temperature (°C);

Liquid or gas coolant temperature (°C);

Coolant flow rate (l h-1)

Electrical Energy absorbed (kWh);

Drive motor current (A)

Mechanical Stirring rate (revolutions m-1);

Conveyor speed (m min-1);

Mixing time (min)

Energy

Air motion Cooling or capture velocity (m s-1);

Exhaust gas velocity (m s-1) or flow rate (m3 s-1)

Design Settings, geometry,

orientation

Lid open or closed;

Time delay until lid opens (s);

Local exhaust ventilation, position;

Exhaust duct diameter (mm);

Nearest operator position (m);

Height of material drop (m);

Direction of discharge

Seal leaks Seal integrity

Air cleaner Separation efficiency (%);

pressure loss across filter (Pa)

Local exhaust ventilation

Capture efficiency (%)

Pollution control system

Decontamination index

Performance

Total emission Emission rate (g min-1), pollutant concentration parameter (mg m-3)

BS EN 626-2:1996+A1:2008

!Relationship between this European Standard and the Essential

Requirements of EU Directive 98/37/EC

This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive Machinery 98/37/EC, amended by 98/79/EC

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 European Standard and Directive 98/37/EC

Clause(s)/sub-clause(s) of this EN Essential Requirements (ERs) of

Directive 98/37/EC, amended by 98/79/EC

Qualifying remarks/Notes

All clauses Annex I, 1.5.13 Emission of dust, gases etc

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

the scope of this standard."