EN 12921-2:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Maschinen zur Oberflächenreinigung und -vorbehandlung von industriellen Produkten mittels Flüssigkeiten oder Dampfphasen - Teil 2: Anlagen, in denen wässrige Reinigungsmittel verwendet werdenMachines de nettoyage et de pré-traitement de pieces
industrielles utilisant des liquides ou des vapeurs - Partie
2: Sécurité des machines utilisant des liquides de nettoyage a base aqueuseMachines for surface cleaning and pre-treatment of industrial items using liquids or vapours - Part 2: Safety of machines using water based cleaning liquids97.080Aparati za nego talFloor treatment appliancesICS:Ta slovenski standard je istoveten z:EN 12921-2:2005SIST EN 12921-2:2005en01-julij-2005SIST EN 12921-2:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12921-2May 2005ICS 25.220.10; 25.220.20English versionMachines for surface cleaning and pre-treatment of industrialitems using liquids or vapours - Part 2: Safety of machines usingwater based cleaning liquidsMachines de nettoyage et de pré-traitement de pièces industrielles utilisant des liquides ou des vapeurs - Partie 2: Sécurité des machines utilisant des liquides de nettoyage aqueuxMaschinen zur Oberflächenreinigung und -vorbehandlungvon industriellen Produkten mittels Flüssigkeiten oderDampffasen - Teil 2: Anlagen, in
denen wässrigeReinigungsmittel verwendet werdenThis European Standard was approved by CEN on 25 March 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 12921-2:2005: ESIST EN 12921-2:2005

Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC.18
For relationship with EU Directives, see informative annex ZA, which is an integral part of this document. This standard is part of a series of standards in the area of safety for development and construction of machines for surface cleaning and pre-treatment of industrial items using liquids or vapours. 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.
1 Scope This European Standard deals only with the significant hazards of machines for surface cleaning and pre-treatment (in the following called "cleaning machines") of industrial items using water based cleaning liquids in the mode of suspension, solution or dispersion of compounds or substances in water applied by immersion and/or spraying in one or more stages. This European Standard should apply in combination with EN 12921-1. Both parts together cover all significant hazards relevant for cleaning machines for 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 this standard take precedence over the respective requirements in EN 12921-1. This standard should be applied together with EN 12921-3 in case of release of flammable vapours from water based cleaning liquids.
This European Standard should be applied together with EN 12921-3 and prEN 12921-4 in case of use of water based cleaning liquids of which evaporating can lead to hazards caused by explosive atmospheres. Water based cleaning liquids containing a quantity of halogenated solvents exceeding 2 % of the volume are considered hazardous with respect to the creation of a potentially explosive atmosphere. This European Standard does not apply to machinery and related equipment excluded from the scope of EN 12921-1.
This European Standard does not apply to cleaning machines for industrial items using water based cleaning liquids which are manufactured before the publication of this standard by CEN. 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. EN 746-1, Industrial thermoprocessing equipment — Part 1: Common safety requirements for industrial thermoprocessing equipment EN 746-2, Industrial thermoprocessing equipment — Part 2: Safety requirements for combustion and fuel handling systems EN 1127-1, Explosive atmospheres — Explosion prevention and protection — Part 1: Basic concepts and methodology EN 1717, Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow EN 12921-1:2004, Machines for surface cleaning and pre-treatment of industrial items using liquids or vapours — Part 1: common safety requirements EN 12921-3:2004, Machines for surface cleaning and pre-treatment of industrial items using liquids or vapours — Part 3: safety of machines using flammable cleaning liquids EN 60204-1:1997, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:1997) EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN ISO 12100-1:2003; Safety of machinery — Basic concepts, general principles for design — Part 1: Basic terminology, methodology (ISO 12100-1:2003) SIST EN 12921-2:2005

Emulsions can be stable or unstable. 3.7 stable emulsion emulsion containing an emulsifying agent to prevent the separation of its components 3.8 unstable emulsion emulsion which will separate into its components 3.9 neutral solution
any water based solution having a pH value between 6.5 and 7.5 4 List of significant hazards Table 1 — List of significant hazards associated with machines for surface cleaning and pre-treatment using water based cleaning liquids Clause/sub-clause of this standard Hazard Clause/sub-clause of EN 12921-1:20044.1 General This clause contains significant hazards, hazardous situations and events, as far as they are dealt with in this standard, identified by risk assessment as significant for this type of machinery using water-based cleaning liquids and which require action to eliminate or reduce the risk.
4.1 SIST EN 12921-2:2005
Areas from which vapours or liquid can escape are e. g.:  internal chambers of cleaning machines, including dead zones;  tanks and spaces over liquid surfaces;  exhaust and ducts chambers and enclosures;  areas surrounding doors, covers and lids;  areas where parts can transit during load/unload operation. 4.3 4.4 Thermal hazards 4.4 4.5 Hazards generated by noise 4.5 4.6 Hazards generated by materials and substances processed, used or emitted by the cleaning machine 4.6 4.6.1 General 4.6.1
NOTE Information on the method of risk analysis is given in EN 1050.
The hazards generated by contact with/or inhalation of dangerous fluids, gases, mists, fumes and dust can be caused by e. g.:  contact with irritant of corrosive chemicals (e. g. by pickling, passivating);  inhalation of vapours, powder or mist (e. g. during preparation of solutions for chromating and phosphating);  backflow of water based cleaning liquid into the public water supply. The above mentioned hazards can occur in the following situations and can be caused by:  handling of the cleaning products (due to the necessity of mixing and/or the reaction with water) during the filling and refilling of the cleaning machine;  normal operation;  chemical reaction caused by the contaminant(s) during the cleaning process;  chemical reaction caused by mixing not compatible products;  modification of the chemical characteristics of the water based cleaning liquid which may occur during the process;  cleaning machine failure or breakdown due to the not compatibility of material of construction with the water based cleaning liquid or the chemical reactions generated during the cleaning process;  maintenance. 4.6.2 4.6.3 Fire and explosion hazard See 4.6.3.1 and 4.6.3.2 of EN 12921-1:2004. These hazards may be caused by:  the forming of hydrogen caused by chemical reaction of acid or alkaline cleaning liquid with metal (e. g. particularly with aluminium, magnesium or other alloys), in particular fines, small chips and swarf, and/or contaminants;  the water based liquid to be used in the cleaning machine (e. g. emulsion);  change in composition of the water based liquid due to drag out or flammable residues being removed from items being cleaned;  deflagration in oil or gas direct fired heating system. 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 12921-2:2005
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