EN 12505:2000+A1:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Stroji za predelavo hrane - Centrifugalni stroji za predelavo jedilnega olja in masti - Varnostne in higienske zahteveNahrungsmittelmaschinen - Zentrifugen zur Verarbeitung von eßbaren Ölen und Fetten - Sicherheits- und HygieneanforderungenMachines pour les produits alimentaires - Centrifugeuses pour le traitement des huiles et des graisses alimentaires - Prescriptions de sécurité et d'hygièneFood processing machinery - Centrifugal machines for processing edible oils and fats - Safety and hygiene requirements67.260Tovarne in oprema za živilsko industrijoPlants and equipment for the food industryICS:Ta slovenski standard je istoveten z:EN 12505:2000+A1:2009SIST EN 12505:2002+A1:2010en,fr01-februar-2010SIST EN 12505:2002+A1:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12505:2000+A1
October 2009 ICS 67.260 Supersedes EN 12505:2000English Version
Food processing machinery - Centrifugal machines for processing edible oils and fats - Safety and hygiene requirements
Machines pour les produits alimentaires - Centrifugeuses pour le traitement des huiles et des graisses alimentaires -Prescriptions de sécurité et d'hygiène
Nahrungsmittelmaschinen - Zentrifugen zur Verarbeitung von eßbaren Ölen und Fetten - Sicherheits- und Hygieneanforderungen This European Standard was approved by CEN on 21 April 2000 and includes Amendment 1 approved by CEN on 23 July 2009.
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
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12505:2000+A1:2009: ESIST EN 12505:2002+A1:2010

Noise test code - Grade 2 of accuracy. 24Annex B (normative)
Principles of design to ensure the hygiene of centrifugal machine for processing edible oils and fats . 28Annex C (informative)
Evaluation and verification method for bowl design and calculation procedure . 30Annex D (informative)
Bibliography . 36Annex ZA (informative)
!!!!Relationship of this European standard and the Essential Requirements of EU Directive 98/37/EC"""" . 37Annex ZB (informative)
!!!!Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC"""" . 38 SIST EN 12505:2002+A1:2010

!". 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 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.
It specifies safety and hygiene requirements for the design, manufacture, use, maintenance and cleaning of centrifugal machines. The normal operating methods are described in 3.2. This standard does not apply to machines using solvent extraction and ancillary machines (e.g. conveyors, hoppers, etc.). It is not applicable to basket centrifuges. This European Standard is applicable primarily to machines which are manufactured after the date of approval 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 documents (including any amendments) applies." !deleted text" EN 294:1992, Safety of machinery - Safety distances to prevent danger zones being reached by the upper limbs !EN 614:2006, Safety of machinery — Ergonomic design principles — Part 1: Terminology and general principles" !deleted text" EN 953:1997, Safety of machinery - General requirements for the design and construction of guards fixed, movable) SIST EN 12505:2002+A1:2010

!EN 1005-3:2002, Safety of machinery — Human physical performance — Part 3: Recommended force limits for machinery operation"
EN 1037:1995, Safety of machinery - Prevention of unexpected start-up EN 1050:1996, Safety of machinery - Principles of risk assessment !EN 1672-2:2005, Food processing machinery — Basic concepts — Part 2: Hygiene requirements" !EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements" !deleted text" EN 60529:1991, Classification of degree of protection provided by enclosures (code IP) EN ISO 3744:1995, Acoustic - Determination of sound power levels of noise sources – Engineering method employing and enveloping measurement surface in an essentially free field over a reflecting plane EN ISO 4871:1996, Acoustic - Verification and declaration of noise emission values of machinery and equipment
EN ISO 11201:1995, Acoustic - Noise emitted by machinery and equipment - Measure of emission sound pressure levels at the work station and at other specified positions – Engineering method in an essentially free fields over a reflecting plane EN ISO 11688-1, Acoustic - Recommended practice for the design of low noise machinery and equipment, Part 1: Planning !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) EN ISO 13849-1:2008, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design (ISO 13849-1:2006) EN ISO 13850:2008, Safety of machinery — Emergency stop — Principles for design (ISO 13850:2006)" !deleted text" ISO 468:1982, Surface roughness - Parameters, their values and general rules for specifying requirements !ISO 1940-1:2003, Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state — Part 1: Specification and verification of balance tolerances" !deleted text" IEC 60651:1979, Sound level meters and Amendment 1:1993 IEC 60804:1985, Integrating-averaging sound level meters SIST EN 12505:2002+A1:2010

respectively decanter and disc stack centrifuges. 3.2 centrifugal machine it is used for the extraction and separation of edible oils and fats in which, by means of centrifugal force, the incoming product ("feed") is separated into the different liquid and solid phases. 3.2.1 decanter centrifuge it is used to extract the solid phase from the liquid (oil or oil and water) phase (see Figure 1) The feed enters the machine through a fixed pipe (1) and is distributed on the internal surface of the bowl (2), by centrifugal force. The scroll (3), which rotates at a slightly different speed from the bowl, conveys the solid residue to the outlet holes (4). The scraper (5), driven by an electric motor (6) removes the solid residue from the walls of the housing (7).
The normal operating method of this centrifuge is of the continuous feeding and discharging of the processed products. The liquids pass out from the bowl through special weir holes: for oil phase (8) and for water phase (9). An electric motor (10) drives the bowl by a transmission device (11) (e.g.: pulleys, belts and hydraulic clutch). The scroll is rotated by means of a scroll driving device (12) (e.g.: pulleys, belts and gear box). 3.2.2 disc stack centrifuge centrifugal machine with vertical axis. It is used to separate oil from water and small quantity of residual solid (see Figures 2 and 3). The feed enters the machine through a fixed vertical pipe (1). Inside the bowl, under the effect of the centrifugal force, the feed is separated into three layers: residual solid (2), water (3), and oil (4). The feed passes through the discs (5). The liquids pass out from the bowl through weir rings: for oil (6) and for water (7). Oil and water are collected under a fixed bowl cover (8) which acts as a support for the feed pipe (1), and for oil (9) and water (10) outlet pipes. The normal operating method of this centrifuge is of the continuous feeding and discharging of the processed liquid products.
On the self-cleaning disc stack centrifuge (see Figure 2) the residual solid can be discharged by a hydraulic discharging device (11) which permits its ejection, by centrifugal force, whilst the machine is operating. On the manual disc stack centrifuge (see Figure 3) the residual solid can be discharged only when the machine is at rest and after the bowl has been opened. The electric motor (12) drives the bowl by a transmission device (13) (e.g.: a mechanical clutch and gears). SIST EN 12505:2002+A1:2010

Figure 1 — Decanter centrifuge (informative) SIST EN 12505:2002+A1:2010

Figure 2 — Disc stack centrifuge - self cleaning discharge version (informative
Figure 3 — Disc stack centrifuge - manual discharge version (informative 3.3
feed: Material to be processed by the centrifugal machines. 3.4
bowl: Rotating part of hollow and asymmetric shape containing the feed. 3.5
scroll: Helicoidal-shaped rotating part of the decanter centrifuge, situated inside the bowl. 3.6
bowl cover: An element which when closed prevents contact with the working parts and accidental emissions of the feed from the bowl. 3.7
operating speed: It is the working speed of the machine and is dependent on the specific application. 4 List of significant hazards
This clause contains all hazards identified by risk assessment as being specific and significant for centrifugal machines used for processing edible oils and fats and which require measures to reduce risk. 4.1 Mechanical hazards
The significant hazards are:  crushing;
 shearing;
 entanglement;
 abrasion;
 ejection of machine parts;
 ejection of processed product;
 loss of stability; 4.1.1 Decanter centrifuge The example in figure 4 shows the hazard zones (for loss of stability hazard see 4.1.4). Zone 1  belts and pulley;  static sensor and rotating cam of bowl speed indicator (if provided) Entanglement for hands and other parts of body, also of clothes; abrasion for hands or other parts of body; ejection of cover due to incorrect attachment; ejection of machine parts. Zone 2  belts and pulleys;  static sensor and rotating cam of gear box speed indicator (if
provided);  gear box for reduction speed between scroll and bowl. Entanglement for hands and other parts of body, also of clothes; abrasion for hands or other parts of body; ejection of cover due to incorrect attachment; ejection of machine parts. Zone 3  chain and sprocket wheels (or gears).
drawing-in; entanglement; abrasion; ejection of machine parts. Zone 4  scraping, rotating (low speed) blades.
Shearing; ejection of processed product.
Figure 4 — Decanter centrifuge - Mechanical hazard zone (informative)
Zone 5  bowl.
Entanglement; abrasion; ejection of machine parts which may be caused by: incorrect electrical supply (which may bring about a change in the direction of rotation or by the use of the wrong frequency); incorrect electrical connections to the electric motor. Ejection of processed product.
Zone 6  end of the bowl, liquid outlet side. Abrasion; ejection of processed product. Zone 7  end of the bowl, residual solid discharge side. Shearing; ejection of processed product. Zone 8  feed pipe. Entanglement through possible rotation of the feed pipe. This hazard is a consequence of indirect friction between rotating parts and this feed pipe by way of the material being processed inside the bowl. Zone 9  rotating hydraulic clutch with external cooling fins; SIST EN 12505:2002+A1:2010

Figure 5 — Disc stack centrifuge - Mechanical hazard zones (informative) 4.1.3 Unexpected start-up Unexpected start-up or failure of controls may cause hazards with the consequences listed in 4.1.1 and 4.1.2. 4.1.4 Loss of stability Loss of stability may occur if the machine is not securely anchored to a suitable base, or by incorrect removal and lifting of any part of the centrifugal machine. Loss of stability may also occur due to an improperly balanced bowl or to a bowl that becomes unbalanced owing to a build-up of material or having been incorrectly repaired or re-assembled after maintenance.
4.2 Electrical hazard caused by electrical contact (direct or indirect) This hazard may cause injury or death from electric shock or burns caused by a lack of insulation, or by direct contact with live electrical contacts, or by contact with exposed conductive parts which are made live by a fault and which may result in electric shock. 4.3 Hazard generated by noise, resulting in hearing losses or other physiological disorders The sources of noise are the electrical motors, the driving devices, the bowl and other moving parts. 4.4 Hygiene The lack of hygiene can create risks for human health and unacceptable modification of foodstuffs by contamination by microbial organisms or other foreign substances. 4.4.1 Chemical Chemical agents incompletely rinsed out of the machine. SIST EN 12505:2002+A1:2010

These may gain access to the interior of the machinery and contaminate the product. 4.5 Hazards generated by neglecting ergonomic principles They are generated by unhealthy postures or excessive efforts during essential operations such as assembly and disassembly of machine parts, cleaning and maintenance, lifting and handling of heavy components. 5 Safety requirements and/or measures
Machinery shall comply with the safety requirements and/or measures of this clause. In addition, the centrifuges shall be designed according to the principles of !EN ISO 12100" for hazards relevant but not significant which are dealt with by this standard. 5.1 Mechanical hazards The hazard of ejection of machine parts relates to most of the hazard zones and it is a consequence of the high rotational speed of the bowl. Given the high rotational speeds and energies involved it is not practical to build a guard that would contain the bowl parts. However the ejection of machine parts risk shall be reduced to an acceptable level by avoiding failure of rotating parts, according to the following requirements and/or measures:  stress and deformation calculations of the rotating parts shall be performed. One method is shown in Annex C.  the machine shall be able to comply with a type-test of overspeed running (see clause 6);  if the drive mechanism is capable of driving the centrifuge at a speed greater than its maximum permissible speed, then it shall have an overspeed indicator which shall give visual and audible warning that the limit has been exceeded.
An overspeed prevention device shall be provided to either prevent the centrifuge from exceeding the maximum permitted speed or to isolate power to the drive mechanism.
All the centrifuges used for processing edible oils and fats shall be provided with an indicator giving visual and audible warning of excessive vibration. An excess vibration device shall isolate power to the drive mechanism.
 determining the worst case dynamic bursting stresses, the avoidance of running near to natural (resonant) frequencies, the avoidance of shaft whirling and the avoidance of fatigue failure for the design life;  the mounting location for the motor shall be clearly and permanently marked with an arrow indicating the correct direction of rotation.  provision of sufficient information for use. SIST EN 12505:2002+A1:2010

To avoid a loss of stability the following requirements and/or measures shall be satisfied:  correct balancing of the rotor according to !ISO 1940-1:2003";  !if a mechanical braking device" is provided, its activation shall cut off the electric power to the motor before applying the
braking effect. When the brake action on the bowl involves the driving parts (e.g. pulleys and belts or gears), the maximum applied braking deceleration shall be lower than or equal to the maximum start-up acceleration. The manufacturer shall specify, to ensure stability:  requirements for securing the machine to its foundation, and provide those means; SIST EN 12505:2002+A1:2010

5.2 Electrical hazard Unless stated otherwise, all electrical equipment shall comply with !EN 60204-1:2006". All electrical connections shall be in accordance with the instructions for use.
5.2.1 Electromagnetic compatibility (see 4.4.2 of !!!!EN 60204-1:2006"""") Where electrical components are to be used, the manufacturer shall obtain from the supplier of these components, confirmation that they are suitable for the use under the intended operating conditions of the machine. The manufacturer shall not install electrical components that do not meet the above requirement. 5.2.2 IP Degree The protection level is stipulated by the IPs. Electric motors, control devices and indicators shall have as a minimum degree of protection that stipulated by IP 55 (see EN 60529). 5.2.3 Emergency stop (see 9.2.5.4 of !!!!EN 60204-1:2006"""" and EN 418: 1992) Emergency stop of !category 0 or 1 shall be" located at the point from where the machine is clearly visible. 5.2.4 Safety related parts of the control system !The safety related parts of the control system shall present a performance level defined in accordance with EN ISO 13849-1:2008 with a minimum of level “d”. NOTE A lower performance level may be acceptable in some cases, if based on a specific risk assessment." 5.3 Hazard generated by noise 5.3.1 Noise reduction
Centrifugal machines shall be so designed and constructed that risks from emission of airborne noise are reduced to the lowest level by particularly applying measures at source to control noise (ref. EN ISO 11688-1). 5.3.2 Noise emission measurement, declaration procedure The measurements, declaration and verification of noise emission values shall be made in accordance with the relevant noise test code in Annex A. 5.4 Hygiene requirements The hazards presented in 4.4 shall be minimised by ensuring that the centrifugal machine is properly designed, manufactured and installed so as to facilitate through cleaning and routine maintenance. Edible oils and fats do not provide a suitable medium for the growth of micro-organisms. They can be a vector for contamination, but would need a high initial inoculation. SIST EN 12505:2002+A1:2010

Materials shall withstand wear and prevent entering of vermin. The materials shall be resistant to detergent products and means of cleaning as recommended by the manufacturer. On food area the following material requirements are to be added:  non-absorbent;  corrosion resistant;  non-toxic;  not transfer undesirable odours, colours or taint to the food;  not contribute either to the contamination of food or have any adverse influence on the food. 5.4.1 Food area The food contact areas are as follows: 5.4.1.1 Decanter centrifuge (see Figure 6)  the feed pipe, 1;  the inside of the bowl, 2;  the s
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