SIST EN 12757-1:2006

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Mixing machinery for coating materials - Safety requirements - Part 1: Mixing machinery for use in vehicle refinishingMešalne naprave za premaze – Varnostne zahteve – 1. del: Mešalne naprave za uporabo v lakirnicah za popravila avtomobilovMachines a homogénéiser des produits de revetement - Prescriptions de sécurité - Partie 1 : Machines a homogénéiser destinées a etre utilisées pour la réfection des peintures d'automobilesMischgeräte für Beschichtungsstoffe - Sicherheitsanforderungen - Teil 1: Mischgeräte zur Verwendung in der Fahrzeugreparaturlackierung87.100Oprema za nanašanje premazovPaint coating equipmentICS:SIST EN 12757-1:2006enTa slovenski standard je istoveten z:EN 12757-1:200501-marec-2006SIST EN 12757-1:2006SLOVENSKI
STANDARD







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12757-1October 2005ICS 87.100 English VersionMixing machinery for coating materials - Safety requirements -Part 1: Mixing machinery for use in vehicle refinishingMachines à homogénéiser des produits de revêtement -Prescriptions de sécurité - Partie 1 : Machines àhomogénéiser destinées à être utilisées pour la réfectiondes peintures d'automobilesMischgeräte für Beschichtungsstoffe -Sicherheitsanforderungen - Teil 1: Mischgeräte zurVerwendung in der FahrzeugreparaturlackierungThis European Standard was approved by CEN on 1 August 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 12757-1:2005: E



EN 12757-1:2005 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.6 3 Terms and definitions.7 4 List of significant hazards.10 5 Safety requirements and/or measures.13 6 Verification of the safety requirements and/or measures.19 7 Information for use.21 Annex A (informative)
Relationship between categories and zones.24 Annex B
(informative)
Explosion-prevention requirements for mixing machinery for vehicle refinishing.25 Annex C (informative)
National references to exposure limit values.26 Annex D (informative)
Classification of construction material’s reaction to fire - National standards.27 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC.28 Annex ZB (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC.29 Bibliography.30



EN 12757-1:2005 (E) 3 Foreword This European Standard (EN 12757-1:2005) has been prepared by Technical Committee CEN/TC 271 “Surface treatment equipment — Safety”, 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 April 2006, and conflicting national standards shall be withdrawn at the latest by April 2006. This European Standard 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 and ZB, 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.



EN 12757-1:2005 (E) 4 Introduction This European Standard is a C type standard as stated in Parts 1 and 2 of EN ISO 12100. This European Standard is part of a series of documents specifying the health, safety and environmental protection requirements for the devices, units and equipment for surface coating:  EN 1953 "Atomising and spraying equipment for coating materials — Safety";  prEN 12621 "Machinery for the supply and circulation of coating materials under pressure — Safety";  EN 12757-1 "Mixing machinery for coating materials — Safety". The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this European Standard. NOTE Further parts of this European Standard to cover other mixing machinery applications for coating materials may follow. When provisions of this type C standard are different from those which are stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard.



EN 12757-1:2005 (E) 5
1 Scope 1.1 This European Standard applies to the design and construction of mixing machinery for liquid coating materials equipped with container of maximal volume ≤ 10 l used by vehicle refinishers and their coating materials distributors. The pressure related parts of the machines covered are classified as no higher than category I under article 9 of the Pressure Equipment Directive 97/23/EC. NOTE Pressure related parts of the machines referred to in this European Standard exceeding the limits of category I may lead to additional application of the Pressure Equipment Directive 97/23/EC. This European Standard deals with all significant hazards, hazardous situations and events relevant to mixing machinery mentioned above, when they are used as intended and under the conditions foreseen by the manufacturer (see Clause 4). Mixing machinery can operate by stirring or vibrating (shaking) and consists of the following equipment:  cabinet;  stirrer;  vibrator;  shaker;  drive unit and related devices;  container for coating material;  safety, measuring and control devices;  lighting;  heating equipment and/or air conditioning inside the mixing cabinet. The mixing machinery may be fixed or mobile. 1.2 The following is excluded from this European Standard:  Mixing machinery intended for:  pressure vessels;  open or closed material containers larger than 10 l;  hand-held mixing tools. 1.3 This European Standard is not applicable to mixing machinery which are manufactured before the date of publication of this European Standard by CEN.



EN 12757-1:2005 (E) 6 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 294, Safety of machinery — Safety distances to prevent danger zones being reached by the upper limbs EN 349, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body EN 619, Continuous handling equipment and systems — Safety and EMC requirements for equipment for mechanical handling of unit loads EN 811, Safety of machinery — Safety distances to prevent danger zones being reached by the lower limbs EN 842, Safety of machinery — Visual danger signals — General requirements, design and testing EN 953, Safety of machinery — Guards — General requirements for the design and construction of fixed and movable guards EN 954-1, Safety of machinery — Safety-related parts of control systems — Part 1 : General principles for design EN 971-1:1996, Paints and varnishes — Terms and definitions for coating materials — Part 1: General terms EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components — Hydraulics EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components — Pneumatics EN 1037:1995, Safety of machinery — Prevention of unexpected start-up EN 1088, Safety of machinery — Interlocking devices associated with guards — Principles for design and selection EN 13445-1, Unfired pressure vessels — Part 1: General EN 13463-1:2001, Non-electrical equipment for potentially explosive atmospheres — Part 1: Basic method and requirements EN 13463-5, Non-electrical equipment intended for use in potentially explosive atmospheres — Part 5: Protection by constructional safety "c" EN 13478, Safety of machinery — Fire prevention and protection EN 14462, Surface treatment equipment — Noise test code for surface treatment equipment including its ancillary handling equipment — Accuracy grades 2 and 3 EN 60079-0, Electrical apparatus for explosive gas atmospheres — Part 0: General requirements (IEC 60079-0:2004) EN 60079-15, Electrical apparatus for explosive gas
atmospheres - Part 15: Type of protection
"n" (IEC 60079-15:2001, modified) 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 61000-6-1, Electromagnetic compatibility (EMC) — Part 6-1: Generic standards — Immunity for residential, commercial and light-industrial environments (IEC 61000-6-1:1997, modified)



EN 12757-1:2005 (E) 7 EN 61000-6-2, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for industrial environments (IEC 61000-6-2:1999, modified) EN 61000-6-3, Electromagnetic compatibility (EMC) — Part 6-3: Generic standards — Emission standard for residential, commercial and light-industrial environments (IEC 61000-6-3:1996, modified) EN 61000-6-4:2001, Electromagnetic compatibility (EMC) — Part 6-4: Generic standards — Emission standard for industrial environments (IEC 61000-6-4:1997, modified) EN 61010-1, Safety requirements for electrical equipment for measurement, control and laboratory use — Part 1: General requirements (IEC 61010-1:2001) EN ISO 11688-1:1998, Acoustics — Recommended practice for the design of low-noise machinery and equipment — Part 1: Planning (ISO/TR 11688-1:1995) 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 principles (ISO 12100-2:2003) ISO 3864-1:2002, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety signs in workplaces and public areas 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 971-1:1996, EN ISO 12100-1:2003 and the following apply. 3.1 mixing machinery machine for the mixing by stirring (with an inside agitating device), or by vibrating or shaking (by motion of the container) of liquid coating materials in containers (vessels without pressure) NOTE 1 In a container, in which two or more components of which at least one is in a liquid consistence are brought together to be processed to a liquid coating material for vehicle refinishing use. NOTE 2 In general, the mixing machinery consists of a cabinet (as framework) with several shelves on which the mixing places are arranged. The number of shelves and mixing places depend on the volume of the container. The mixing places could be occupied by container of standardized mixing coating materials with a capacity between 1 l and 10 l. The container is closed by a stirring lid. The stirring lids generally consist of a unit with stirrer, lid and drive (e.g. clamp or rack-wheel) which are put on the open container of the coating materials. The lids are fixed by the pressing and turning of fixing clamps and ensure mixing process only in totally closed container. The stirrer can be powered e.g. via a clamp drive by a motor powered special shaft or via belt or worm drive. In general this is an electric motor, but also air driven motors are used, especially for installations in hazardous explosive environments. Furthermore the mixing machinery is equipped with a control unit with programmable timer controlling the mixing time (in most cases several times a day) of the closed stirring container. By fitting the side cowling moving parts of the power drive can be protected. Another standard equipment of mixing cabinets are drip trays for the coating materials. If necessary, the mixing machinery is equipped with lighting. 3.2 container vessel without pressure used for mixing and/or storage of coating and/or auxiliary materials 3.3 agitator device which is used to stir or otherwise to move the coating material



EN 12757-1:2005 (E) 8 NOTE Such device is generally used in conjunction with coating material containers. Such devices may be driven by a power supply and may have a shaft with a stirrer inside a container. The cover of this container may be an integrated part of the stirrer. 3.4 stirrer part of the agitator which is immersed into the liquid coating material NOTE Depending on the characteristics of the coating material, different types of stirrer may be used such as, but not limited to, discs, rods, twirling sticks, paddles (blades), propellers, impellers etc. 3.5 vibrator, shaker device for mixing by mechanical movement of the liquid coating material container 3.6 hoses flexible conduits intended for the transport of coating and/or auxiliary materials and compressed air, when connected together 3.7 pipes rigid conduits intended for the transport of coating and/or auxiliary materials and compressed air, when connected together 3.8 safety device device to fulfil a safety function when in use and the failure or malfunctioning of which endangers the safety or health of persons 3.9 coating material organic product in liquid or in paste (semi-solid) form (see 1.9 of EN 971-1:1996) NOTE 1 Such coating materials may consist of binding agents, pigments, fillers, solvents and other additives. NOTE 2 Such coating materials can be:  varnishes (see 1.7 of EN 971-1:1996);  paints (see 1.36 of EN 971-1:1996);  patching compounds;  fillers (see 1.21 of EN 971-1:1996);  sealers and adhesives. 3.10 auxiliary material materials used for such purposes as:  solvent, compressed air (for cleaning);  water, compressed air (for maintenance) 3.11 chemical reaction process where the coating material or any part of the coating material reacts with the materials of construction of the mixing machinery and/or process which takes place between the components of coating materials 3.12 flammable substance substance in form of gas, vapour, liquid, solid, or mixtures of these, able to undergo an exothermic reaction with air when ignited (see 3.1 of EN 1127-1:1997)



EN 12757-1:2005 (E) 9 NOTE 1 “Flammable substances” and “combustible material” are equivalently used terms in this document. NOTE 2 Examples:  Solvents, which are flammable or slow burning;  most coating materials. 3.13 non-flammable coating material in accordance with EN 50059:1990 a substance which, in any mixture with air, cannot be ignited by an ignition source of less than 500 mJ 3.14 explosion range the range of the concentration of a flammable substance with air, within which an explosion can occur (see 3.13 of EN 1127-1:1997) 3.15 lower explosion limit (LEL) the lower limit of the explosion range (see 3.8 of EN 1127-1:1997) 3.16 hazardous areas areas where hazards due to explosive atmosphere may exist. The probability of occurrence of explosive atmos-pheres is classified in zones NOTE Limits of hazardous zones are given in Annex B. 3.16.1 zone 0 place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is present continuously or for long periods or frequently (see 6.3.2 of EN 1127-1:1997) 3.16.2 zone 1 place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally (see 6.3.2 of EN 1127-1:1997) 3.16.3 zone 2 place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is not likely to occur in normal operation, but, if it does occur, will persist for a short period only (see 6.3.2 of EN 1127-1:1997) 3.17 equipment category ignition protection category for intended use of equipment in areas in which explosive atmospheres may occur 3.17.1 equipment Group II category 1 equipment designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a very high level of protection. Equipment in this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists or by air/dusts mixtures are present continuously, for long periods or frequently. Equipment of this category ensures the requisite level of protection, even in the event of rare malfunctions relating to equipment, and is characterised by means of protection such that:  either, in the event of failure of one means of protection, at least an independent second means provides the requisite level of protection,



EN 12757-1:2005 (E) 10  or the requisite level of protection is assured in the event of two faults occurring independently of each other 3.17.2 equipment Group II category 2 equipment designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a high level of protection. Equipment in this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists or by air/dusts mixtures are likely to occur. The means of protection relating to equipment in this category ensuring the requisite level of protection, even in the event of frequently occurring disturbances or equipment faults which normally have to be taken into account 3.17.3 equipment Group II category 3 equipment designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a normal level of protection. Equipment in this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists or by air/dusts mixtures are unlikely to occur or, if they do occur, are likely to do so only infrequently and for a short period only. Equipment of this category ensures the requisite level of protection during normal operation 3.18 maximum allowable temperature maximum temperature for which the equipment is designed as specified by the manufacturer 3.19 maximum allowable pressure maximum pressure for which the equipment is designed as specified by the manufacturer 3.20 functional test test carried out for every mixing machinery operated under normal operating conditions 3.21 type test test conducted at the design stage of the product which proves the conformity with the required safety factors and/or measures 4 List of significant hazards 4.1 General This clause contains the significant hazards, hazardous situations and events as far as they are dealt with in this document, identified by risk assessment as significant for this type of mixing machinery for use in vehicle refinishing and which require action to eliminate or reduce the risk. The following hazards may occur when installing, operating, cleaning or maintaining the machine. NOTE Information on the method of risk analysis is given in EN 1050.



EN 12757-1:2005 (E) 11 4.2 Mechanical hazards 4.2.1 Crushing, shearing, entanglement, drawing-in or trapping These hazards are related to  physical contact with fixed or moving parts of the mixing machinery such as:  drive units;  shafts;  agitators and/or stirrers;  vibrating or shaking containers;  insufficient safety distances;  Instability of mobile mixing machinery causing tipping or moving. NOTE Such hazards may occur by an unexpected start-up due to pre-programmed cycles within the mixing machinery. 4.2.2 High pressure fluid ejection These hazards are related to:  escaping pressurised liquid coating materials or compressed air;  rupture of housing, piping or joints due to failure, breakdown, vibrations, corrosion. 4.2.3 Loss of stability (of the mixing machinery and its parts) These hazards are related to, e.g.  improper positioning of the mixing machinery;  overload;  overfilling. 4.3 Electrical hazards 4.3.1
Electrical shock (by direct or indirect contact) Such hazards can occur, for instance by touching:  electrically live parts that are non insulated for operational reasons;  conductive parts which are not at a dangerous voltage under normal operation, but in the case of failure could be;  electrically live parts when the insulation is damaged by contact with solvents or by mechanical parts. 4.3.2 External influence on electrical equipment hazard Such hazards can occur, for instance when interaction of the electromagnetic high voltage equipment with construction elements of the control and safety systems can cause dangerous malfunctions for instance, short circuits on electronic safety circuits, entrance guards, alarm units.



EN 12757-1:2005 (E) 12 4.4 Noise hazards Hazardous noise levels can be reached for instance by noise emission of pumps, handling devices, compressed air equipment (motors, valves etc.) when the coating and/or auxiliary materials are processed in the mixing machinery. Noise can cause hearing impairment, and accidents to operators of the machine or persons working near it due to interference with verbal communication and with perception of acoustic danger signals, extra-auditory effects, shock reactions. 4.5 Hazards generated by dangerous substances 4.5.1 Hazards resulting from contact with/or absorption of dangerous substances Such hazards can be generated by contact with/or absorption of organic liquid coating materials, solvents, cleaning agents causing skin and eye damage, dermatitis or allergies. 4.5.2 Hazards resulting from inhalation of dangerous substances Such hazards can be generated by inhalation of aerosols and solvent vapours released by organic liquid coating materials. 4.6 Fire and explosion hazards generated by coating and/or auxiliary materials used by the mixing machinery Such hazards are generated by flammable coating and/or auxiliary materials as a vapour, suspension of fine droplets and/or explosive mixtures together with sources of ignition. Examples of flammable substances which increase the concentration above normal are:  not allowable working temperature leading to the formation of flammable vapours;  failure of hoses, pipes and/or fittings with exit of flammable substances;  auto-ignition caused by chemical reactions between different types of liquid coating materials. Examples of ignition sources are:  hot surfaces e.g. of heating and/or electrical equipment;  sparks created by mechanically induced energy e.g. fans, agitators;  electrostatic discharges;  electrical sparks;  welding and other sources of thermal energy used during maintenance and cleaning. 4.7 Hazards caused by failure of energy supply These hazards are related to:  failure, malfunction of control system (unexpected start-up, heating system failure);  failure of forced ventilation, if applicable;  unexpected ejection of coating materials;  missing guards;



EN 12757-1:2005 (E) 13  missing displays or warnings. 4.8 Hazards related to failure of control systems These hazards may lead to:  accumulation of vapours caused by breakdown of forced ventilation;  unexpected overrun. 5 Safety requirements and/or measures 5.1 General The mixing machinery shall comply with the safety requirements and/or protective measures of this document. In addition it shall be designed according to the principles of EN ISO 12100 for hazards relevant but not significant which are not dealt with by this document (e.g. sharp edges). 5.2 Safety requirements and measures against mechanical hazards 5.2.1 Safety measures against crushing, shearing, entanglement, drawing-in or trapping Moving parts such as vibrators, shakers, stirrers and components of the drive unit shall be designed and safeguarded in such a way that in normal operation and maintenance crushing, entanglement, drawing-in or trapping, impact cannot occur. EN 294, EN 349, EN 811, EN 842, ISO 3864-1, EN 619 and EN 953 shall be taken into account. Where this is not possible, exposed moving parts shall be protected by fixed guards, permanent enclosures or interlocking guards in accordance with EN 953 and EN 1088. Fixed guards or permanent enclosures shall only be removable with a tool. Agitators, the stirrers of which can be moved out of the movable containers, shall be equipped with an interlocking device (see 3.26.1 of EN ISO 12100-1:2003) according category 3 of EN 954-1 and shall be designed in such a way that they can only be switched on if the stirrer is inside the container. If, for operational reasons, any of the above requirements cannot be fulfilled, specific measures to ensure safe operation of the mixing machinery shall be provided such as, but not limited to:  lockable actuator;  trip device;  slip clutch;  shear pin;  special design of the stirrers;  torque limiters. The coating material container shall be secured against rotating during the stirring operation by either a firm stand or a fixing device for the container.



EN 12757-1:2005 (E) 14 Access to parts that require adjustment, setting of controls or sensors (e.g. to vibrators or shakers with power actuated fixing device for the coating material container) shall be prevented by fence-type enclosure or be safeguarded in a way resulting in the same level of safety. For fence-type enclosures, the safety distances according to EN 294 apply. Guards shall satisfy the requirements of EN 953. 5.2.2 Safety measures against hazards generated by ejection of materials 5.2.2.1 Mixing machinery and its components shall be designed and constructed in such a way that no hazardous ejection of coating materials may result from leakages or component failures in normal operation and maintenance. The requirements shall be fulfilled by:  adequate design of all parts under pressure;  guards and protection according to EN 953. Components shall be designed and constructed for the maximum pressure they could be subjected to, also taking into account faulty conditions. Where a pressure system is composed of interconnected pressure vessels it shall be classified in the highest category according to the Pressure Equipment Directive applicable for the individual pressure vessel. Where a pressure vessel contains several fluids, classification shall be on the basis of the fluid which requires the highest category. Mixing machines shall be equipped with an exhaust device for safe dumping of residual pressure (e.g. valve with deflection). Pressure shall not be dumped by e.g. disconnection of a pipe or hose or opening a draining valve. If equipped with a draining valve, opening of the draining valve shall only be possible by using a tool and in depressurised condition. Safety devices shall be designed and p
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