SIST EN 12779:2016
(Main)Safety of woodworking machines - Chip and dust extraction systems with fixed installation - Safety requirements
Safety of woodworking machines - Chip and dust extraction systems with fixed installation - Safety requirements
This European Standard deals with the significant hazards, hazardous situations and events relevant for chip and dust extraction systems for fixed installation and for connection with machines for working on solid wood (including hard wood) and wood-based materials, when they are used as intended and under the conditions foreseen by the manufacturer, including reasonably foreseeable misuse.
This European Standard deals also with the technical requirements to minimize the hazards in connection with the temporary storage of wood dust and chips in a silo, bin or container including charging and discharge systems.
This European standard does not apply to:
a) chip and dust extraction systems with filters installed indoors (covered by prEN 16770);
b) extraction equipment (e.g. extraction hoods, ducts) within a woodworking machine including the outlet to which the extraction system is connected;
c) chip and dust extraction systems designed for KST values above 200 bar ms−1;
d) mechanical conveying systems between filter and storage facility;
e) extraction systems and conveying systems with underpressure below 0,3 bar or overpressure above 0,3 bar;
f) storage devices for pressed wood products (e.g. pellets) and humid shavings.
Requirements for containers are not dealt with in this standard.
This European Standard is not applicable to machines which are manufactured before the date of its publication as EN.
Sicherheit von Holzbearbeitungsmaschinen - Ortsfeste Absauganlagen für Holzstaub und Späne - Sicherheitstechnische Anforderungen
Diese Europäische Norm behandelt die signifikanten Gefährdungen, Gefährdungssituationen und Gefährdungsereignisse für ortsfeste Absauganlagen für Holzstaub und Späne und für deren Verbindung mit Maschinen zur Bearbeitung von Massivholz (einschließlich Hartholz), Holzwerkstoffen und holzähnlichen Werkstoffen, wenn sie bestimmungsgemäß und entsprechend den durch den Hersteller vorhersehbaren Bedingungen verwendet werden, einschließlich vernünftigerweise vorhersehbarem Missbrauch.
Diese Europäische Norm behandelt auch die technischen Anforderungen, um die Gefahren im Zusammenhang mit der zeitweiligen Lagerung von Holzstaub, Spänen und Hackschnitzeln in einem Silo, Sammelbehälter oder Container einschließlich Beschickungs- und Austragssystem auf ein Mindestmaß zu reduzieren.
Diese Europäische Norm gilt nicht für:
a) Absauganlagen für Holzstaub und Späne mit innen aufgestellten Filtern (durch prEN 16770 abgedeckt);
b) Absaugausrüstungen (z. B. Absaughauben, Rohrleitungen) innerhalb einer Holzbearbeitungsmaschine, einschließlich des Absaugstutzens, an den die Absauganlage angeschlossen wird;
c) Absauganlagen für Holzstaub und Späne konstruiert für KST-Werte oberhalb 200 bar ms 1;
d) mechanische Transportsysteme zwischen Filtereinheit und Lagereinrichtung;
e) Absaugsysteme und Transportsysteme mit Unterdruck unterhalb von 0,3 bar oder Überdruck oberhalb von 0,3 bar;
f) Lagereinrichtungen für gepresste Holzprodukte (z. B. Pellets) und feuchte Hackschnitzel.
Anforderungen für Container werden nicht in dieser Norm behandelt.
Diese Europäische Norm gilt nicht für Maschinen, die vor Veröffentlichung als Europäische Norm hergestellt wurden.
Sécurité des machines pour le travail du bois - Installations fixes d'extraction de copeaux et de poussières - Prescriptions de sécurité
La présente Norme européenne traite des phénomènes dangereux, situations et événements dangereux significatifs applicables aux systèmes d'extraction des copeaux et poussières pour les installations fixes et pour les raccordements aux machines pour le travail du bois massif (y compris de bois dur), des matériaux à base de bois et des matériaux similaires au bois, lorsqu’ils sont utilisés normalement et dans les conditions prévues par le fabricant, incluant une mauvaise utilisation raisonnablement prévisible.
La présente Norme européenne traite également des prescriptions techniques pour réduire les phénomènes dangereux liés au stockage temporaire des poussières de bois, des copeaux et des plaquettes dans un silo, un bac de réception ou un conteneur y compris les systèmes de chargement et de déchargement.
La présente norme européenne ne s’applique pas aux :
a) systèmes d’extraction des copeaux et poussières avec des filtres installés à l'intérieur (couverts par le prEN 16770) ;
b) équipements d'extraction (par exemple, buses d'extraction, conduits) situés dans une machine à bois, y compris la sortie à laquelle le système d'extraction est raccordé ;
c) systèmes d’extraction des copeaux et poussières conçus pour des indices KST supérieures à 200 bar ms1 ;
d) systèmes de convoyage mécanique situés entre le filtre et l'installation de stockage ;
e) systèmes d’extraction et systèmes de convoyage avec une dépression inférieure à 0,3 bar, ou une surpression supérieure à 0,3 bar ;
f) dispositifs de stockage pour les produits en bois agglomérés (par exemple, granulés) et les plaquettes humides.
Les prescriptions relatives aux conteneurs ne sont pas traitées dans la présente norme.
La présente Norme européenne n’est pas applicable aux machines qui ont été fabriquées avant sa date de publication comme EN.
Varnost lesnoobdelovalnih strojev - Nepremični odsesovalni sistemi za lesne odrezke in prah - Varnostne zahteve
Ta evropski standard opisuje večja tveganja, nevarne razmere in dogodke za nepremične odsesovalne (lesnoobdelovalne) sisteme za lesne odrezke in prah iz točke 4, kadar se uporabljajo v skladu z njihovim namenom in pod pogoji, ki jih predvideva proizvajalec, vključno s pogoji pričakovane nepravilne uporabe.
Ta evropski standard opisuje tudi tehnične zahteve za zmanjšanje tveganj v povezavi z začasnim skladiščenjem lesnega prahu in odrezkov v silosu, vključno s sistemi za polnjenje in praznjenje. Ta evropski standard se ne uporablja za:
a) odsesovalne sisteme za odrezke in prah z notranje nameščenimi filtri;
b) odsesovalno opremo (npr. odsesovalni pokrovi, vodi) v notranjosti lesnoobdelovalnega stroja, tj. do in vključno z odvodom, na katerega je priključen odsesovalni sistem;
c) odsesovalne sisteme za odrezke in prah, zasnovane za vrednosti KST, večje od 200 bar ms-1;
d) mehanske transportne sisteme med filtrom in skladiščnim prostorom.
Ta evropski standard se ne uporablja za stroje, ki so bili proizvedeni pred objavo tega dokumenta kot standarda EN.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sicherheit von Holzbearbeitungsmaschinen - Ortsfeste Absauganlagen für Holzstaub und Späne - Sicherheitstechnische AnforderungenSécurité des machines pour le travail du bois - Installations fixes d'extraction de copeaux et de poussières - Prescriptions de sécuritéSafety of woodworking machines - Chip and dust extraction systems with fixed installation - Safety requirements79.120.10Lesnoobdelovalni strojiWoodworking machinesICS:Ta slovenski standard je istoveten z:EN 12779:2015SIST EN 12779:2016en,fr,de01-februar-2016SIST EN 12779:2016SLOVENSKI
STANDARDSIST EN 12779:2005+A1:20091DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12779
November
t r s w ICS
y {ä s t rä s r Supersedes EN
s t y y {ã t r r v ªA sã t r r {English Version
Safety of woodworking machines æ Chip and dust extraction systems with fixed installation æ Safety requirements Sécurité des machines pour le travail du bois æ Installations fixes d 5extraction de copeaux et de poussières æ Prescriptions de sécurité
Sicherheit von Holzbearbeitungsmaschinen æ Ortsfeste Absauganlagen für Holzstaub und Späne æ Sicherheitstechnische Anforderungen This European Standard was approved by CEN on
t x September
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t y y {ã t r s w ESIST EN 12779:2016
Examples of extraction systems . 37 A.1 Explanation to figures . 37 A.2 Interface to woodworking machinery. 43 Annex B (informative)
Table with corresponding terms in English, French and German . 44 Annex C (informative)
Classification of places where explosive atmospheres may occur (according to Directive 1999/92/EC) . 48 Annex D (informative)
Noise reduction at the design stage . 50 D.1 Noise sources . 50 D.2 Measures to reduce noise . 50 D.3 Impact from chips and dust . 51 Annex E (normative)
Silos with a cross section up to 45 m2 . 52 Annex F (informative)
Measurement of residual dust content . 54 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC . 55 Bibliography . 58
machine manufacturers (small, medium and large enterprises); —
health and safety bodies (regulators, accident prevention organizations, market surveillance etc.). Others can be affected by the level of machinery safety achieved with the means of the document by the above-mentioned stakeholder groups: —
machine users/employers (small, medium and large enterprises); —
machine users/employees (e. g. trade unions, organizations for people with special needs); —
service providers, e.g. for maintenance (small, medium and large enterprises); —
consumers (in case of machinery intended for use by consumers). The above-mentioned stakeholder groups have been given the possibility to participate at the drafting process of this document. The machinery concerned and the extent to which hazards, hazardous situations and events covered are indicated in the scope of this document. 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 other standards, for machines that have been designed and built in accordance with the provisions of this type C standard. The requirements of this document are directed to manufacturers and their authorized representatives of chip and dust extraction systems. This document also includes information to be provided by the manufacturer to the user. SIST EN 12779:2016
1)
This document is impacted by the stand-alone amendment EN 60204-1:2006/A1:2009. 2)
This document is impacted by the stand-alone amendments EN 60529:1991/A1:2000 and EN 60529:1991/A2:2013, and by the corrigendum EN 60529:1991/corrigendum May 1993. SIST EN 12779:2016
¶ 0,5 mm 3.1.5 shaving chip with a typical length of above 15 mm and a low thickness compared to other dimensions 3.1.6 extraction ducting all parts of the ducting between the extraction points and the filter consisting of main and branch and machine connection ducts, gate valves, fire gates and back pressure flap
3) This document is impacted by the stand-alone amendment EN ISO 14122-2:2001/A1:2010. 4) This document is impacted by the stand-alone amendment EN ISO 14122-3:2001/A1:2010. 5) This document is impacted by the stand-alone amendment EN ISO 14122-4:2004/A1:2010. SIST EN 12779:2016
Pa Maximum explosion overpressure Pmax bar Reduced maximum explosion overpressure Predmax bar Material flow rate qm kg/h KST value KST bar ms «1 Minimum ignition energy MIE mJ Minimum ignition temperature MIT °C Lower explosion level LEL g m «3 4 List of significant hazards This clause contains all significant hazards, hazardous situations and events (see EN ISO 12100:2010), identified by risk assessment as significant for the extraction systems as defined in the scope and which require action to eliminate or reduce the risk. This European Standard deals with these significant hazards by defining safety requirements and/or measures or by reference to relevant standards. These hazards are listed in Table 2 in accordance with EN ISO 12100:2010, Annex B. If gaseous pollutants occur at the working area, they will be partly removed from the working area by the extraction system for wood dust and chips. But the gaseous pollutants are not separated by the extraction system for dust and chips. SIST EN 12779:2016
Requirements Applicable clauses of this standard Subclause of EN ISO 12100:2010 Origina Potential consequencesb
1 Mechanical hazards — height from the ground; — instability; — moving parts; — rotating parts; — rough, slippery surface; — stored energy; — explosion venting (ejection of parts); — gravity (bridges of dust and chips); — crushing; — drawing-in or trapping; — entanglement; — shearing; — slipping, tripping and falling; — impact; — sinking into wood dust and chips; — being buried under wood dust and chips; 5.3. ff 5.8 ff 5.2.1 5.2.2 5.2.3 6.2.3 a) 6.2.6 6.2.10 6.3.5.2 6.3.5.4
2 Electrical hazards — electrostatic phenomena; — parts which have become live under fault conditions; — electrocution; — fire; — electric shock; 5.7 ff 5.2.3 6.2.9 6.3.3.2 6.3.5.4 6.4.4 6.4.5 3 Thermal hazards — explosion; — flame; — objects or materials with a high temperature; — burn; — fire spreading; — pressure shockwave 5.4 ff 5.2.1 5.2.3 6.2.4 b) 6.2.8 c) 4 Noise hazards — exhausting system; — scraping surfaces; — unbalanced rotating parts; — whistling pneumatics; — compressed air; — discomfort; — permanent hearing loss; — stress; — tinnitus; — tiredness; 5.5 6.2.3 c) 6.2.8 c) 6.3.1 6.3.4.2 6.4.3 6.4.5.1 b) and c) 7 Material/ substance hazards — biological and microbiological (viral or bacterial) agent; — dust; — flammable materials; — breathing difficulties, suffocation; — cancer; — explosion; — fire; — fire spreading; — poisoning; — sensitization. 5.6 ff 5.2.1 6.2.3 b) 6.2.3 c) 6.2.4 a) 6.3.4.4 6.4.5.1 c) 6.4.5.1 g) 8 Ergonomic hazards — access; — visibility; — stress; — any other (for example, mechanical, electrical) as a consequence of a human error; 5.3.3 5.8.1 5.8.2 5.8.3 6.2.7 6.2.8 6.2.11.8 SIST EN 12779:2016
Requirements Applicable clauses of this standard Subclause of EN ISO 12100:2010 Origina Potential consequencesb
9 Hazards associated with the environment in which the machine is used — lightning; — humidity; — snow; — wind; — slipping, falling; — fire; 5.3.3 5.4.2.1 5.4.2.2 5.4.2.3 6.2.6 6.4.5.1 b) a A single origin of a hazard can have several potential consequences. b For each type of hazard or group of hazards, some potential consequences can be related to several origins of hazard. 5 Safety requirements and/or measures 5.1 General The extraction system shall comply with the safety requirements and/or protective measures of this clause. In addition, the system shall be designed in accordance with the principles of EN ISO 12100:2010 for hazards relevant but not significant, and which are not dealt with in this document (e.g. sharp edges). For guidance in connection with risk reduction by design, see EN ISO 12100:2010, 6.2 and for safeguarding measures, see EN ISO 12100:2010, 6.3. 5.2 Control systems 5.2.1 Safety and reliability of control systems Control systems shall be designed in compliance with the principles of EN ISO 13849-1:2008. The following safety-relevant functions shall correspond to a performance level (PL) according to EN ISO 13849-1:2008: — mode selection PL c (see 5.3.2 and 5.8.3); — emergency stop PL c (see 5.2.2 and 5.8.3); — interlocking (shut down and switching procedures) to limit effects of fire and explosions PL c (see 5.4.1); — monitoring of dust concentration in recirculation air PL b (see 5.6.4.2); — spark extinguishing system PL c (see 5.4.3.2.1); — interlocking of charging/discharging system with access openings to silos PL c (see 5.8.3). Verification: By checking the relevant calculations, drawings and the data of the components used. 5.2.2 Emergency stop Emergency stop devices shall meet the requirements of EN 60204-1:2006 and EN 60204-1:2006/A1:2009, 9.2.5.4 and 10.7, and EN ISO 13850:2008, and shall be placed on each control panel. SIST EN 12779:2016
minimum ignition temperature of a dust cloud (MIT dc) 400 °C
Minimum ignition temperature of a dust layer with reference to a 5 mm layer of dust (MIT dl5) 250 °C (increased layers of dust reduce the minimum ignition temperature) combustion class 4/5
lower explosion limit/level (LEL) 60 g m «3 The particle size distribution in extraction systems is not homogeneous. In literature, a LEL of 30 g m «3 for a particle size less than 63 µm can be found. In extraction systems, this value is not representative for the real situation. A LEL of 60 g m «3 has therefore been adopted. maximum explosion overpressure Pmax 9 bar
maximum pressure rise KST 200 bar ms «1
5.4.1.3 Avoidance of chip and dust accumulation in ducting Ducting shall be designed in such a way that accumulation of chip and dust does not occur. The conveying air velocity in all parts of the ducting shall be sufficient to avoid accumulation of chip and dust in the ducts. Duct connections, inspection doors, dampers, gate valves, fire-gates, etc. integrated in ducting shall not hinder continuous material transportation. NOTE The minimum conveying air velocity depends on the material load, the moisture content, the particle size of the chip and dust. Table 4 shows minimum conveying air velocities of chip and dust with a moisture content
¶ 15 %. SIST EN 12779:2016
15 % Minimum conveying air velocity dust chips shavings low material load < 50 g m «3 12 ms «1 15 ms «1 18 ms «1 high material load < 150 g m «3 15 ms «1 18 ms «1 21 ms «1 conveying system 18 ms «1 22 ms «1 25 ms «1 Verification: By visual inspection, checking the relevant documents, measuring the air velocities and functional testing. 5.4.2 Fire protection and prevention 5.4.2.1 General The spreading of fire (heat radiation and flame transmission) from the filter to adjacent equipment and objects shall be avoided. The spreading of fire and smoke through ducting connected to the filter (extraction ducting, recirculation air ducting, conveying system) shall be avoided. With regard to fire protection requirements, national rules and regulations should be adhered to in agreement with the customer. 5.4.2.2 Measures against fire spreading Filter shall be located outdoors. Ducts connected to the filter (extraction ducts, recirculation air ducts, conveying system) shall be equipped with devices to stop the spreading of fire and smoke. Extraction ducts and recirculation air ducts shall either: a) not pass through a fire wall; or b) be equipped with fire gates according to EN 1366-7:2004 (extraction ducts) and fire dampers according to EN 1366-2:2015 (recirculation air ducts) of an appropriate class of fire rating; or c) be insulated in accordance with the requirements of EN 1366-1:2014 in the corresponding fire zones. Verification: By visual inspection, by checking of the corresponding drawings and by requesting a declaration of compliance from the manufacturer of the components. 5.4.2.3 Measures against fire damage All filters, silos and any other closed storage devices with a storage volume of > 1 m3 shall, as a minimum, have a fixed fire suppression system installed with a fire hose coupling according to local standards. The coupling shall be at a height of 0,4 m to 0,8 m above ground and safely and easily accessible for connection with a fire hose. The fire suppression system shall comply with the following requirements: a) Water nozzles shall be placed so that the entire cross section is reached by the water and the required water flow of 5,0 l/m2min is ensured. The area protected by one nozzle shall not exceed 12 m2. The distance between nozzles shall not exceed 4 m and the distance between nozzles and filter housing shall not exceed 2 m. Instructions by the manufacturer of the nozzles shall be considered; b) automatically activated sprinkler systems shall also have a manual activation. SIST EN 12779:2016
Ignition sources Existing Effective 1 Hot surfaces present under certain conditions:
— foreign objects carried over into the system which blocks or overcharge moving parts, e.g. discharge screw conveyor Yes
— welding-, grinding- and metal cutting activities during maintenance work Yes
— bearings Yes 2 Flames and hot gases, including hot particles existing, if hot flue gases enter the silo from the combustion equipment Yes
existing, if flames or hot particles occur at the connection point and are introduced Yes 3 Mechanically generated sparks on principle possible with fans, high speed parts of the extraction system Yes
mechanical discharge systems No, mechanical discharge systems are usually running at low speed (<1 ms «1)
impact and friction sparks caused by metal parts carried over into the system Sparks from single impacts are in general not effective, if the impact energy is below 20 Nm (see EN 13463–1:2009, 6.4.2.2.5, Table 8).
EXAMPLE With an air velocity of 20 ms «1, a metal part with a weight less than 100 g could not cause an impact spark with enough energy (E = 0,5* m * v2). 4 Electrical equipment and electrical installation electrical equipment in hazardous areas Yes SIST EN 12779:2016
Ignition sources Existing Effective 5 Static electricity
spark discharge (occurs with inadequate earthing) of conductive parts Yes (depending on the size of the components without earthing)
brush or corona discharge No (non-incentive for dusts with minimum ignition energy > 3 mJ)
— propagating brush discharge (occurs in principle e.g. with pneumatic conveying of dusts and bulk material in non-conductive ducts or conductive ducts with non-conductive coatings or liners of high dielectric strength) Yes (shall be avoided by - using conductive materials or non-conductive material of low dielectric strength;
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