EN 12921-4:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.þLãþHQMHMaschinen zur Oberflächenreinigung und -vorbehandlung von industriellen Produkten mittels Flüssigkeiten oder Dampfphasen - Teil 4: Sicherheit von Maschinen, in denen halogenierte Lösemittel verwendet werdenMachines de nettoyage et de prétraitement de pieces industrielles utilisant des liquides ou des vapeurs - Partie 4: Sécurité des machines utilisant des solvants halogénésMachines for surface cleaning and pretreatment of industrial items using liquids or vapours - Part 4: Safety of machines using halogenated solvents97.080Aparati za nego talFloor treatment appliancesICS:Ta slovenski standard je istoveten z:EN 12921-4:2005SIST EN 12921-4:2005en01-november-2005SIST EN 12921-4:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12921-4June 2005ICS 25.220.10; 25.220.20 English VersionMachines for surface cleaning and pretreatment of industrialitems using liquids or vapours - Part 4: Safety of machines usinghalogenated solventsMachines de nettoyage et de prétraitement de piècesindustrielles utilisant des liquides ou des vapeurs - Partie 4:Sécurité des machines utilisant des solvants halogénésMaschinen zur Oberflächenreinigung und -vorbehandlungvon industriellen Produkten mittels Flüssigkeiten oderDampfphasen - Teil 4: Sicherheit von Maschinen, in denenhalogenierte Lösemittel verwendet werdenThis European Standard was approved by CEN on 19 May 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12921-4:2005: ESIST EN 12921-4:2005

Examples and description of types of cleaning machines using halogenated solvents and design parameters.25 A.1 Examples and description of types of cleaning machines using halogenated solvents.25 A.2 Characteristics for halogenated solvents.30 Annex B (informative)
A-deviations.31 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC.32 Bibliography.33
Figures Figure A.1 — Collection chamber cleaning machine using halogenated solvents – type Ia.25 Figure A.2 — Single chamber cleaning machine using halogenated solvents – type Ib.26 SIST EN 12921-4:2005

1 Scope This European Standard specifies the significant hazards of machines for surface cleaning and pre-treatment – in the following called "cleaning machines" – of industrial items using halogenated solvents, either pure or as a mixture. This European Standard applies together with EN 12921-1:2005. Both parts together cover all significant hazards relevant for cleaning machines of industrial items using liquids or vapours, when they are used as intended and under the conditions foreseen by the manufacturer (see Clause 4). The specific requirements specified in Part 4 take precedence over the respective requirements in EN 12921-1:2005. This European Standard applies together with EN 12921-3 in case of release of flammable vapours from the cleaning liquids. This European Standard does not apply to machinery and related equipment excluded from the scope of EN 12921-1:2005. This European Standard is not applicable to cleaning machines which are manufactured before the publication of this European Standard by CEN. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1093-3, Safety of machinery — Evaluation of the emission of airborne hazardous substances — Part 3: Emission rate of a specified pollutant — Bench test method using the real pollutant EN 12921-1:2005, Machines for surface cleaning and pretreatment of industrial items using liquids or vapours — Part 1: Common safety requirements EN 12921-3, Machines for surface cleaning and pretreatment of industrial items using liquids or vapours — Part 3: Safety of machines using flammable cleaning liquids EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic terminology, methodology (ISO 12100-1:2003)
EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical principle (ISO 12100-2:2003) 3 Terms and definitions For the purpose of this European Standard, the terms and definitions given in EN ISO 12100-1:2003, EN 12921-1:2005 and the following apply. 3.1 halogenated solvent organic solvent containing at least one halogen atom per molecule and not having a flash point as obtained by standard methods NOTE Examples for halogenated solvents are:  dichloromethane (methylene chloride);  HCFC 123, HCFC 141B and HCFC 225;
4.6.2.2 Substances generated by chemical decomposition These hazards are related to:  solvent overheating due to the increased concentration of contaminants (high boiling oils, hydrocarbons, tar, etc.);  over temperature by the heating system;  chemical reactions between halogenated solvent and water (present on the items to be cleaned due to humidity condensation or other sources);  halogenated solvent breakdown due to radiation, e.g. UV light;  halogenated solvent breakdown due to high temperature from external sources (e.g. flames);  halogenated solvent breakdown due to reaction caused by reactive metal fines and swarf acting as a catalyst (e.g. zinc, magnesium, aluminium).
4.6.3 Fire and explosion hazard See 4.6.3.1 and 4.6.3.2 of EN 12921-1:2005. Fire or explosion hazards are caused by presence of flammable vapours (in hazardous explosion mixtures) together with a potential ignition source. Flammable vapours can be originated from total loss of halogenated solvent and overheating of combustible contaminants. Vapours produced within the flammable region and a high energy source being present. NOTE The risk of fire or explosion is extremely low with halogenated solvents during normal operation. 4.6.3 4.7 Hazards combinations 4.7 4.8 Hazards caused by failure of energy supply 4.8 4.9 Hazards related to failure of control system 4.9 SIST EN 12921-4:2005

NOTE The above requirement can best be achieved by means of programmable mechanical handling. 5.6.2.1.4.5 Items process dwell time
In type Ia- and type II-cleaning machines, the items shall be held in the cleaning tanks for the necessary period of time to ensure the items leave the cleaning liquid at a temperature equal to the final cleaning tank fluid temperature, to avoid excessive drag-out. Exceptions can be allowed if other suitable means or any other systems resulting in the same level of safety. NOTE For type Ia-cleaning machines the above can be achieved e.g. by fitting a vapour sensor at the vapour zone height, for type II-cleaning machines this can be achieved e.g. by means of adequate programming of mechanical handli
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