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

Status
Published
Publication Date
24-Nov-2015
Withdrawal Date
30-May-2016
ICS
79.120.10 - Woodworking machines
Technical Committee
CEN/TC 142 - Woodworking machines - Safety
Drafting Committee
CEN/TC 142/WG 10 - Chip and dust extraction systems
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
16-Jul-2021
Completion Date
14-Apr-2025
Directive
2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
Mandate
M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
Ref Project
SIST EN 12779:2016 - Safety of woodworking machines - Chip and dust extraction systems with fixed installation - Safety requirements

Relations

Replaces
EN 12779:2004+A1:2009 - Safety of woodworking machines - Chip and dust extraction systems with fixed installation - Safety related performances and safety requirements
Effective Date
19-Nov-2011

Overview

EN 12779:2015 is a CEN (CEN/TC 142) European standard specifying safety requirements for fixed chip and dust extraction systems used with woodworking machines processing solid wood, wood-based and wood-like materials. It covers significant hazards, hazardous situations and events when systems are used as intended - including reasonably foreseeable misuse - and includes technical requirements to minimize risks related to temporary storage of wood dust, chips and shavings in silos, bins or containers.

Keywords: EN 12779, chip and dust extraction systems, woodworking machines safety, dust extraction safety standard, CEN.

Key topics and technical requirements

EN 12779 addresses both system design and operational safety. Major technical topics include:

  • Control systems and reliability - safety-related controls, emergency stop provisions and behavior on power failure.
  • Mechanical protection - structural stability, guarding against shearing, crushing and drawing-in, safe access and pneumatic hazards.
  • Fire and explosion protection - identification of fire/explosion hazards, prevention measures, suppression and structural requirements for ducts and conveyors.
  • Dust and hazardous substance control - dust emission performance, residual dust measurement and requirements for dust reintroduction or discharge.
  • Noise and electrical safety - design measures to minimise noise and electrical hazard requirements for fixed extraction installations.
  • Silo and storage requirements - design, charging/discharge systems, openings and specific requirements for silos (including annexes for small silos up to specified cross-sections).
  • Information for use - marking, instruction handbook content for installation, operation, maintenance and fire-fighting procedures.

Notable exclusions (from the standard’s scope):

  • Filters installed indoors (covered by prEN 16770)
  • Extraction equipment inside woodworking machines (hoods, ducts within the machine)
  • Systems designed for KST values above 200 bar·m/s
  • Mechanical conveying between filter and storage
  • Systems with underpressure < 0.3 bar or overpressure > 0.3 bar
  • Storage devices for pressed wood products (pellets) and humid shavings

Applications

EN 12779 is applied where fixed extraction systems collect chips, shavings and wood dust from woodworking production lines and feed them to filters and storage (silos/bins). Typical applications:

  • Industrial woodworking shops and panel production lines
  • Furniture manufacturing plants and joineries
  • Central extraction and dust handling systems in factories

Who should use this standard

  • Manufacturers of fixed chip and dust extraction systems
  • Machine builders integrating extraction interfaces
  • Safety engineers, facility designers and maintenance contractors
  • Regulatory and health & safety bodies and market surveillance authorities
  • Employers and users of woodworking machinery seeking compliance with the Machinery Directive

Related standards

EN 12779 references and complements standards such as EN 1127-1 (explosive atmospheres), EN 1366 series (fire resistance for ducts and dampers), EN 13463-1 (non-electrical equipment in explosive atmospheres) and EN 12750 (four-sided moulding machines). For indoor filter installations see prEN 16770.

For procurement, design and compliance work, EN 12779:2015 is the essential Europe-wide reference for safe fixed chip and dust extraction systems in woodworking environments.

Frequently Asked Questions

EN 12779:2015 is a standard published by the European Committee for Standardization (CEN). Its full title is "Safety of woodworking machines - Chip and dust extraction systems with fixed installation - Safety requirements". This standard covers: 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.

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.

EN 12779:2015 is classified under the following ICS (International Classification for Standards) categories: 79.120.10 - Woodworking machines. The ICS classification helps identify the subject area and facilitates finding related standards.

EN 12779:2015 has the following relationships with other standards: It is inter standard links to EN 12779:2004+A1:2009. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 12779:2015 is associated with the following European legislation: EU Directives/Regulations: 2006/42/EC; Standardization Mandates: M/396. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.

You can purchase EN 12779:2015 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.

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;
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

Loading comments...

Die EN 12779:2015 ist eine entscheidende europäische Norm, die sich mit der Sicherheit von Holzverarbeitungsmaschinen, insbesondere mit der Sicherheit von Chip- und Staubabsauganlagen mit fester Installation, befasst. Diese Norm hat einen klar definierten Anwendungsbereich, der sich auf signifikante Gefahren, gefährliche Situationen und Ereignisse konzentriert, die im Zusammenhang mit Chips- und Staubabsauganlagen stehen, die zur Bearbeitung von Massivholz und holz-basierten Materialien verwendet werden. Die Norm stellt sicher, dass diese Systeme unter den vom Hersteller vorgesehenen Bedingungen eingesetzt werden und auch potenziellen unsachgemäßen Anwendungen Rechnung getragen wird. Ein besonders wichtiger Aspekt der Norm ist die Festlegung technischer Anforderungen zur Minimierung der Gefahren, die mit der vorübergehenden Lagerung von Holzstaub und Chips in Silos, Behältern oder Containern verbunden sind, einschließlich der Ladesysteme und Entladesysteme. Diese Regelungen sind essenziell, um die Sicherheit in der Holzverarbeitungsindustrie zu gewährleisten und die Risiken von Staubexplosionen und anderen gefährlichen Vorfällen zu reduzieren. Die Stärken der EN 12779:2015 liegen in ihrer präzisen Definition der Anwendungsreichweite sowie der klaren Abgrenzung von Ausschlüssen, wie beispielsweise Chip- und Staubabsauganlagen mit Filtern, die in geschlossenen Räumen installiert sind, oder solche, die mit Maschinen zur Holzverarbeitung direkt verbunden sind. Durch diese gründliche Differenzierung kann die Norm gezielt auf relevante Sicherheitsanforderungen eingehen, ohne unnötige Verwirrung zu stiften. Die Relevanz dieser Norm zeigt sich in der zunehmend strengen Regulierung der Sicherheitsstandards in der Holzverarbeitungsindustrie. Die EN 12779:2015 bietet eine umfassende Grundlage, auf der Hersteller und Betreiber von Holzverarbeitungsmaschinen ihre Sicherheitsvorkehrungen anpassen und verbessern können, um die Arbeitsschutzvorgaben zu erfüllen. Daher ist die Norm nicht nur ein Leitfaden für die Implementierung geeigneter Sicherheitsmaßnahmen, sondern auch eine wertvolle Ressource für die Entwicklung von zukünftigen Technologien im Bereich der Chip- und Staubabsaugung.

EN 12779:2015 provides a comprehensive framework aimed at ensuring the safety of woodworking machines through the effective management of chip and dust extraction systems with fixed installations. The standard is pivotal for organizations involved in woodworking processes, addressing significant hazards associated with the use of chip and dust extraction systems for solid wood and wood-based materials. The strengths of this standard lie in its detailed examination of both the operational and safety requirements necessary for minimizing risks during the extraction processes. Notably, it encompasses practical stipulations regarding the storage of wood dust and chips in containers, silos, or bins, including their associated charging and discharge systems. This aspect is crucial as it aids in preventing potential hazards that could arise from improper material handling. Additionally, the scope of EN 12779:2015 clearly delineates what is covered and what falls outside its purview. For instance, the exclusion of indoor extraction systems, mechanical conveying systems, and specific extraction equipment ensures that the document remains focused and relevant to its intended application. Such distinctions help manufacturers and operators to better allocate their resources and adhere to applicable safety protocols. Moreover, the relevance of this standard extends to both existing implementations and future developments in chip and dust extraction systems, making it an essential reference for compliance in the woodworking industry. By addressing reasonable foreseeable misuse and providing guidelines for intended use, EN 12779:2015 underscores the commitment to safety and operational efficiency. In conclusion, the EN 12779:2015 standard serves as a significant resource in establishing safety requirements for chip and dust extraction systems in fixed woodworking machines, promoting safe practices, and facilitating compliance within the industry. Its clear scope, strong emphasis on minimizing hazards, and specific exclusions enhance its applicability and practicality in real-world scenarios.

La norme EN 12779:2015 présente des exigences de sécurité cruciales pour les systèmes d'extraction de copeaux et de poussières installés de manière fixe, spécifiquement conçus pour une utilisation avec des machines de travail du bois. Son champ d’application est particulièrement pertinent pour ces systèmes lorsque ceux-ci sont utilisés conformément aux prévisions du fabricant, y compris en tenant compte des usages raisonnablement prévisibles. L’un des points forts de cette norme est son approche exhaustive des dangers significatifs liés aux systèmes d'extraction, garantissant ainsi la protection des opérateurs et la prévention des situations dangereuses lors de l'utilisation. En outre, elle aborde également les exigences techniques nécessaires pour minimiser les risques associés au stockage temporaire de la poussière de bois et des copeaux, en se concentrant sur les silos et conteneurs, ainsi que sur les systèmes de chargement et déchargement. Cependant, il est important de noter que la norme ne couvre pas certains dispositifs, tels que les systèmes d'extraction intérieure avec filtres, ainsi que les équipements d'extraction intégrés aux machines de travail du bois. Cela permet de concentrer son application sur les installations fixes et d'éviter les ambiguïtés dans l'interprétation des exigences de sécurité. De plus, en excluant certains systèmes de transport mécanique et des dispositifs de stockage pour produits en bois pressé, la norme renforce son cadre de sécurité tout en s'efforçant de fournir des recommandations claires et précises. Cela souligne son caractère ciblé et son efficacité dans son domaine d'application. En résumé, la norme EN 12779:2015 est d'une grande pertinence pour les responsables de la sécurité dans le secteur du travail du bois, offrant des directives solides et des exigences pratiques pour garantir la sécurité des systèmes d'extraction de poussières et de copeaux dans un environnement de travail fixe.

SIST EN 12779:2016は、木工機械におけるチップおよび粉塵排出システムの安全要件に関する非常に重要な欧州標準です。この標準は、固定設置用のチップと粉塵排出システムが直面する重大な危険や危険な状況に焦点を当てています。特に、固体木材（硬材を含む）および木質材料での作業に使用される機械との接続を考慮しており、製造業者が定めた使用条件下での適切な使用を前提としています。 この標準の強みは、木材粉塵およびチップの一時的な保管に関連する技術的要件を詳述している点です。《シロ・ビン・容器における保管方法や充填および排出システムに関する基準》は、効果的な安全対策を実装するためのフレームワークを提供します。このように、SIST EN 12779:2016は、木工業界における作業環境の安全性向上に寄与する重要な指針となっています。 また、本標準は、内部にフィルターを設置したチップおよび粉塵排出システムや、木工機械内の排出装置、特定の条件を超えるKST値を持つシステムには適用されないため、特定の取り扱いにおいての範囲が明確に定義されています。これにより、必要な基準と要件が乱れることなく、適切な技術的フレームワークを確保することができます。 総じて、SIST EN 12779:2016は、木工機械に関連するチップおよび粉塵の安全な排出に関する包括的な指針を提供し、業界での安全性を高めるための非常に重要な標準です。

SIST EN 12779:2016 표준은 고정 설치된 목재 기계의 칩 및 먼지 추출 시스템의 안전 요구 사항을 다루고 있습니다. 이 표준은 단단한 목재(경목 포함) 및 목재 기반 재료에서 작업하는 기계와 연결된 추출 시스템에 대한 주요 위험 요소, 위험한 상황 및 사건을 확인하는 데 중점을 두고 있습니다. 따라서, 이 표준은 제조업체가 예상하는 조건에서 정상적으로 사용될 때 발생할 수 있는 모든 위험을 최소화하는 데 필요한 기술적 요건을 제공합니다. 이 표준의 강점 중 하나는 임시 저장소에서 목재 먼지와 칩의 위험을 최소화하기 위한 조건도 포함하고 있다는 점입니다. 이는 실로(silo), 빈(bin) 또는 컨테이너와 같은 저장 시스템에서의 충전 및 방출 시스템을 통해 안전성을 강화합니다. 그러므로 내부 필터가 설치된 칩 및 먼지 추출 시스템과 같은 특정 시스템에는 적용되지 않으며, 이는 사용자에게 명확한 가이드를 제공합니다. 또한, SIST EN 12779:2016 표준은 가공 기계 내부의 추출 장치나 특정 압력 조건(0.3 bar 이하 또는 이상)의 시스템에는 적용되지 않으므로, 해당 시스템을 운영하는 사용자는 자신의 장비와 이 표준의 적용 범위를 이해하고 구체적인 규정을 준수할 수 있습니다. 이는 기업들이 안전성을 보장하고 법적 요건을 충족하는 데 매우 중요한 역할을 합니다. 결론적으로, SIST EN 12779:2016은 고정 설치된 목재 작업 환경의 안전성을 증대시키기 위한 중요한 기준을 설정하고 있으며, 목재 산업 내에서 칩 및 먼지 추출 시스템의 안전 요구 사항을 효과적으로 충족하는 데 필수적입니다.