SIST EN 620:2021
(Main)Continuous handling equipment and systems - Safety requirements for fixed belt conveyors for bulk materials
Continuous handling equipment and systems - Safety requirements for fixed belt conveyors for bulk materials
1.1 This document deals with the technical requirements for stationary belt conveyors and systems as defined in 3.1 to 3.2.4, designed for continuously conveying loose bulk materials. The covered phases of life cycle are design, setting, operation, maintenance and cleaning.
1.2 This document does not cover:
a) use in coal mining and open cast lignite mining;
b) use for man-riding;
c) floating, dredging and ship mounted structures supporting the conveyor;
d) biological and chemical hazards resulting from handling foodstuffs or pharmaceuticals;
e) the design of the supporting structure which is not part of a conveyor;
f) the effects of wind;
g) hazards resulting from handling specific hazardous materials, (e.g. explosives, radiating material);
h) hazards resulting from contact with or inhalation of harmful fluids, gases, mists, fumes or dust;
i) biological and micro-biological (viral or bacterial) hazards;
j) hazards caused by the use of ionising radiation sources;
k) conveyors fitted with a moving belt with other than a continuous rubber or polymeric surface for the conveying medium;
l) hazards associated with the integration of belt conveyors with other machinery;
The safety requirements of this document apply to equipment and systems placed on the market after the date of publication of this document.
NOTE Directive 2014/34/EC concerning equipment and protective systems intended for operation in potentially explosive atmospheres can be applicable to the type of machine or equipment covered by this European Standard. The present document is not intended to provide means of complying completely with the essential health and safety requirements of Directive 2014/34/EC.
Stetigförderer und Systeme - SicherheitsAnforderungen an ortsfeste Gurtförderer für Schüttgut
1.1 Dieses Dokument behandelt die technischen Anforderungen an ortsfeste Gurtförderer und Systeme nach 3.1 bis 3.2.4, die für die stetige Förderung von Schüttgut ausgelegt sind. Die behandelten Phasen der Lebensdauer umfassen die Gestaltung, die Einrichtung, den Betrieb, die Instandhaltung und die Reinigung.
1.2 Dieses Dokument behandelt nicht:
a) den Einsatz im untertägigen Kohlebergbau und Braunkohletagebau;
b) den Einsatz für den Personentransport;
c) schwimmende, baggernde und schiffsmontierte Strukturen, die den Förderer stützen;
d) biologische und chemische Gefahren durch die Handhabung von Lebensmitteln und Pharmazeutika;
e) die Gestaltung des Tragwerks, das nicht Teil eines Förderers ist;
f) Einwirkungen durch Wind;
g) Gefährdungen, die sich aus der Handhabung von speziell gefährlichen Materialien (z. B. Sprengstoffe, strahlendes Material) ergeben;
h) Gefährdungen, die sich durch den Kontakt mit oder das Einatmen von gefährdenden Flüssigkeiten, Gasen, Nebeln, Dämpfen und Stäuben ergeben;
i) biologische und mikrobiologische Gefährdungen (durch Viren oder Bakterien);
j) Gefährdungen, verursacht durch ionisierende Strahlungsquellen;
k) Förderer, die einen laufenden Gurt als Fördermittel verwenden, dessen gesamte Oberfläche nicht gänzlich aus Gummi oder Polymeren besteht;
l) Gefährdungen, die mit der Einbindung von Gurtförderern an andere Maschinen verbunden sind.
Diese Sicherheitsanforderungen dieses Dokuments gelten für Einrichtungen und Systeme, die nach dem Erscheinungsdatum dieses Dokuments auf den Markt gebracht wurden.
ANMERKUNG Die Richtlinie 2014/34/EG für Einrichtungen und Schutzsysteme, die für den Gebrauch in explosionsgefährdeten Bereichen vorgesehen sind, kann sich auf Maschinen und Einrichtungen beziehen, die von dieser Europäischen Norm abgedeckt werden. Es ist nicht vorgesehen, dass das vorliegende Dokument vollständig mit den Gesundheits- und Sicherheitsanforderungen der Richtlinie 2014/34/EG übereinstimmt.
Équipements et systèmes de manutention continue - Prescriptions de sécurité pour les transporteurs à courroie fixes pour produits en vrac
1.1 Le présent document traite des prescriptions techniques pour les transporteurs et systèmes à courroie fixes tels que définis en 3.1 à 3.2.4, conçus pour le transport en continu de matériaux en vrac. Les phases couvertes du cycle de vie sont la conception, le réglage, l’exploitation, la maintenance et le nettoyage.
1.2 Le présent document ne couvre pas :
a) l’utilisation dans les mines de charbon et les mines de lignite à ciel ouvert ;
b) l’utilisation pour le transport de personnes ;
c) le matériel flottant, le matériel de dragage ou le matériel monté sur un bateau ;
d) les phénomènes dangereux biologiques et chimiques résultant de la manipulation de denrées alimentaires ou de produits pharmaceutiques ;
e) la conception de la structure d’appui qui ne fait pas partie du convoyeur ;
f) les effets du vent ;
g) les phénomènes dangereux dus à la manutention de produits dangereux spécifiques (par exemple explosifs, matériau irradiant) ;
h) les phénomènes dangereux résultant du contact ou de l’inhalation de fluides, gaz, brouillards, fumées ou poussières nocifs ;
i) les phénomènes dangereux biologiques et microbiologiques (virus ou bactéries) ;
j) les phénomènes dangereux dus à l’utilisation de sources de rayonnement ionisant ;
k) les convoyeurs équipés d’une bande transporteuse avec une surface autre que du caoutchouc ou un polymère pour le milieu de transport continu ;
l) les phénomènes dangereux liés à l’intégration de convoyeurs à bande dans d’autres machines.
Les prescriptions de sécurité du présent document s’appliquent aux équipements et systèmes mis sur le marché après sa date de publication.
NOTE La Directive 2014/34/CE relative aux appareils et systèmes de protection destinés à être utilisés en atmosphères explosibles peut s’appliquer au type de machines ou d’équipements couverts par la présente Norme européenne. Le présent document n’est pas destiné à fournir un moyen de satisfaire aux exigences essentielles de santé et de sécurité de la Directive 2014/34/CE.
Naprave in sistemi za kontinuirni transport - Varnostne zahteve za opremo za kontinuirni transport sipkih materialov na nepomičnih ogrodjih
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2021
Nadomešča:
SIST EN 620:2003+A1:2011
Naprave in sistemi za kontinuirni transport - Varnostne zahteve za opremo za
kontinuirni transport sipkih materialov na nepomičnih ogrodjih
Continuous handling equipment and systems - Safety requirements for fixed belt
conveyors for bulk materials
Stetigförderer und Systeme - SicherheitsAnforderungen an ortsfeste Gurtförderer für
Schüttgut
Équipements et systèmes de manutention continue - Prescriptions de sécurité pour les
transporteurs à courroie fixes pour produits en vrac
Ta slovenski standard je istoveten z: EN 620:2021
ICS:
53.040.10 Transporterji Conveyors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 620
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2021
EUROPÄISCHE NORM
ICS 53.040.10 Supersedes EN 620:2002+A1:2010
English Version
Continuous handling equipment and systems - Safety
requirements for fixed belt conveyors for bulk materials
Équipements et systèmes de manutention continue - Stetigförderer und Systeme - Sicherheits-
Prescriptions de sécurité pour les transporteurs à Anforderungen an ortsfeste Gurtförderer für Schüttgut
courroie fixes pour produits en vrac
This European Standard was approved by CEN on 18 July 2021.
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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 620:2021 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 10
4 Safety requirements and /or measures for belt conveyors . 16
4.1 General . 16
4.1.1 Introduction . 16
4.1.2 Zone concept . 16
4.1.3 Requirements for restricted zone . 17
4.2 Requirements for guards . 17
4.2.1 General . 17
4.2.2 Fixed guard . 18
4.2.3 Interlocking guard . 21
4.2.4 Inspection cover . 21
4.2.5 Nip guard . 21
4.3 Measures for protection against mechanical hazards . 24
4.3.1 General requirements . 24
4.3.2 Crushing and shearing hazards . 24
4.3.3 Control cabin . 27
4.3.4 Entanglement, drawing-in and trapping hazards . 27
4.3.5 Hazards arising from ejection of parts (of machinery or handled materials) . 30
4.3.6 Means of access . 31
4.4 Measures for protection against electrical hazards . 34
4.4.1 General . 34
4.4.2 Environment . 34
4.4.3 Electrostatic charges . 34
4.5 Measures for protection against hydraulic hazards . 34
4.6 Measures for protection against pneumatic hazards. 34
4.7 Measures for protection against thermal hazards . 35
4.7.1 Burns and scalds by a possible contact of persons with parts or materials at high
temperature . 35
4.7.2 Health damaging effects by hot or cold work environment . 35
4.8 Measures for protection against fire and explosion hazards . 35
4.8.1 Belt friction . 35
4.8.2 Transported material . 35
4.9 Neglected ergonomic principles in machine design (mismatch of machinery with
human characteristics and abilities) . 36
4.9.1 Unhealthy postures or excessive efforts . 36
4.9.2 Isolated work places . 37
4.10 Measures in case of failure of energy supply and other functional disorders . 37
4.10.1 Uncontrolled motion . 37
4.10.2 Failure or malfunction of safety related parts of control systems . 37
4.11 Measures for protection against hazards arising during inspection, maintenance and
cleaning . 40
4.12 Noise reduction at design stage . 40
5 Verification of safety requirements and/or measures . 41
5.1 General . 41
5.2 Electrical equipment . 43
5.3 Fire or explosion hazards . 43
6 Information for use . 43
6.1 Instruction handbook . 43
6.1.1 General . 43
6.1.2 Instructions for the installation of the equipment . 44
6.1.3 Instructions for the operation of the equipment . 44
6.1.4 Noise declaration . 45
6.1.5 Instructions for maintenance . 45
6.1.6 Training . 47
6.1.7 Decommissioning and dismantling . 47
6.2 Marking . 47
Annex A (informative) List of significant hazards . 48
A.1 General . 48
A.2 Mechanical hazards . 48
A.3 Electrical hazards . 49
A.4 Thermal hazards . 50
A.5 Fire or explosion hazards . 50
A.6 Hazards generated by neglected ergonomic principals in machine design . 50
A.7 Hazards arising from failure of the energy supply and other functional disorders. 51
A.8 Hazards caused by the presence of stored energy . 51
A.9 Hazards arising during inspection, maintenance and cleaning . 51
Annex B (normative) Specification or required performance level (PLr) . 52
Annex C (normative) Noise Test Code . 54
C.1 General . 54
C.2 Operating conditions during measurements . 54
C.3 Determination of A-weighted emission sound pressure level . 54
C.4 Measurement positions . 54
C.5 Information to be recorded . 55
C.6 Information to be reported . 55
C.7 Noise emission declaration . 55
C.8 Example of noise declaration . 56
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC aimed to be covered. 57
Bibliography . 60
European foreword
This document (EN 620:2021) has been prepared by Technical Committee CEN/TC 148 “Continuous
handling equipment and systems - Safety”, the secretariat of which is held by AFNOR.
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 2022 and conflicting national standards shall be
withdrawn at the latest by April 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document will supersede EN 620:2002+A1:2010.
The main changes with respect to EN 620:2002+A1:2010 are as follows:
— Scope was clarified;
— Normative references were updated;
— Definitions were added;
— List of significant hazards updated and removed in an informative Annex;
— Overall safety requirements was updated;
— New normative annex relatin to specification of performance level;
— New requirements relating to noise reduction;
— New Annex ZA in line with template of Machinery harmonized standard;
— De-harmonization to EMC regulation.
This document is part of a series of five standards the titles of which are given below:
— EN 617 “Continuous handling equipment and systems — Safety and EMC requirements for the
equipment for the storage of bulk materials in silos, bunkers, bins and hoppers”;
— EN 618 “Continuous handling equipment and systems — Safety and EMC requirements for equipment
for mechanical handling of bulk materials except fixed belt conveyors”;
— EN 619 ”Continuous handling equipment and systems — Safety requirements for equipment for
mechanical handling of unit loads”;
— EN 620 “Continuous handling equipment and systems — Safety requirements for fixed belt conveyors
for bulk materials”;
— EN 741 “Continuous handling equipment and systems — Safety requirements for systems and their
components for pneumatic handling of bulk materials”.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
This European Standard is a type C standard as stated in EN ISO 12100:2010.
The products concerned and the extent to which hazards are covered are indicated in the scope of this
document.
While producing this document it was assumed that:
— For specific purpose machinery, clarifications occur between the manufacturer and the purchaser
concerning particular conditions for the operation and location of the machinery (typically
considering adjacent machinery, means of access, guarding concept, control systems, etc) related to
health and safety. An agreement is needed between the manufacturer and purchaser about belt
material, considering specific risk e.g. fire and the establishment of zones;
— only suitably trained persons operate this machinery;
— the machinery will be kept in good repair and working order, in accordance with the manufacturer's
instructions, to retain specified health and safety characteristics throughout its working life;
— the place of installation is adequately illuminated;
— the place of installation will allow safe operation of the machinery;
— by design of the load bearing elements, the safe operation of the system and components is ensured
for loading ranging from zero to 100 % of the rated capacities and during testing;
— all parts of the machinery without specific requirements, will be:
a) made from materials of adequate strength and durability and of suitable quality for their
intended purpose;
b) designed in accordance with the usual engineering practice and engineering codes, taking
account of all failure modes and incorporating appropriate safety factors;
— the establishment of the different zones is defined between the user and the manufacturer.
1 Scope
1.1 This document deals with the technical requirements for stationary belt conveyors and systems as
defined in 3.1 to 3.2.4, designed for continuously conveying loose bulk materials. The covered phases of
life cycle are design, setting, operation, maintenance and cleaning.
1.2 This document does not cover:
a) use in coal mining and open cast lignite mining;
b) use for man-riding;
c) floating, dredging and ship mounted structures supporting the conveyor;
d) biological and chemical hazards resulting from handling foodstuffs or pharmaceuticals;
e) the design of the supporting structure which is not part of a conveyor;
f) the effects of wind;
g) hazards resulting from handling specific hazardous materials, (e.g. explosives, radiating material);
h) hazards resulting from contact with or inhalation of harmful fluids, gases, mists, fumes or dust;
i) biological and micro-biological (viral or bacterial) hazards;
j) hazards caused by the use of ionising radiation sources;
k) conveyors fitted with a moving belt with other than a continuous rubber or polymeric surface for the
conveying medium;
l) hazards associated with the integration of belt conveyors with other machinery;
The safety requirements of this document apply to equipment and systems placed on the market after
the date of publication of this document.
NOTE Directive 2014/34/EC concerning equipment and protective systems intended for operation in
potentially explosive atmospheres can be applicable to the type of machine or equipment covered by this European
Standard. The present document is not intended to provide means of complying completely with the essential health
and safety requirements of Directive 2014/34/EC.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 842:1996+A1:2008, Safety of machinery — Visual danger signals — General requirements, design and
testing
EN 1127-1:2019, Explosive atmospheres — Explosion prevention and protection — Part 1: Basic concepts
and methodology
EN 12600:2002, Glass in building — Pendulum test — Impact test method and classification for flat glass
EN 14492-1:2006+A1:2009, Cranes — Power driven winches and hoists — Part 1: Power driven winches
EN 60529:1991 , Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 60204-1:2018, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
EN IEC 60204-11:2019, Safety of machinery — Electrical equipment of machines — Part 11: Requirements
for equipment for voltages above 1 000 V AC or 1 500 V DC and not exceeding 36 kV
EN 60947-5-1:2017, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and
switching elements — Electromechanical control circuit devices (IEC 60947-5-1:2017)
EN 60947-5-5:1997 , Low-voltage switchgear and controlgear — Part 5-5: Control circuit devices and
switching elements — Electrical emergency stop device with mechanical latching function (IEC 60947-5-
5:1997)
EN 61310-1:2008, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for
visual, acoustic and tactile signals (IEC 61310-1:2007)
EN IEC 61496-1:2020, Safety of machinery — Electro-sensitive protective equipment — Part 1: General
requirements and tests (IEC 61496-1:2020)
EN ISO 4413:2010, Hydraulic fluid power — General rules and safety requirements for systems and their
components (ISO 4413:2010)
EN ISO 4414:2010, Pneumatic fluid power — General rules and safety requirements for systems and their
components (ISO 4414:2010)
EN ISO 4871:2009, Acoustics — Declaration and verification of noise emission values of machinery and
equipment (ISO 4871:1996)
EN ISO 7731:2008, Ergonomics — Danger signals for public and work areas — Auditory danger signals
(ISO 7731:2003)
As impacted by EN 60529:1991/A1:2000 and EN 60529:1991/A2:2013.
As impacted by EN 60947-5-5:1997/A1:2005, EN 60947-5-5:1997/A11:2013 and EN 60947-5-5:1997/A2:2017.
EN ISO 11201:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions in an essentially free field over a
reflecting plane with negligible environmental corrections (ISO 11201:2010)
EN ISO 11202:2010, Acoustics — Noise emitted by machinery and equipment — Determination of emission
sound pressure levels at a work station and at other specified positions applying approximate environmental
corrections (ISO 11202:2010)
EN ISO 11688-1:2009, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning (ISO/TR 11688-1:1995)
EN ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk
reduction (ISO 12100:2010)
EN ISO 13732-1:2008, Ergonomics of the thermal environment — Methods for the assessment of human
responses to contact with surfaces — Part 1: Hot surfaces (ISO 13732-1:2006)
EN ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design (ISO 13849-1:2015)
EN ISO 13850:2015, Safety of machinery — Emergency stop function — Principles for design (ISO
13850:2015)
EN ISO 13854:2019, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
(ISO 13854:2017)
EN ISO 13855:2010, Safety of machinery — Positioning of safeguards with respect to the approach speeds
of parts of the human body (ISO 13855:2010)
EN ISO 13856-2:2013, Safety of machinery — Pressure-sensitive protective devices — Part 2: General
principles for design and testing of pressure-sensitive edges and pressure-sensitive bars (ISO 13856-2:2013)
EN ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by
upper and lower limbs (ISO 13857:2019)
EN ISO 14119:2013, Safety of machinery — Interlocking devices associated with guards — Principles for
design and selection (ISO 14119:2013)
EN ISO 14120:2015, Safety of machinery — Guards — General requirements for the design and construction
of fixed and movable guards (ISO 14120:2015)
EN ISO 14122-1:2016, Safety of machinery — Permanent means of access to machinery — Part 1: Choice
of fixed means and general requirements of access (ISO 14122-1:2016)
EN ISO 14122-2:2016, Safety of machinery — Permanent means of access to machinery — Part 2: Working
platforms and walkways (ISO 14122-2:2016)
EN ISO 14122-3:2016, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs,
stepladders and guard-rails (ISO 14122-3:2016)
EN ISO 19353:2019, Safety of machinery — Fire prevention and fire protection (ISO 19353:2019)
ISO 16625:2013, Cranes and hoists — Selection of wire ropes, drums and sheaves
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 12100:2010 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
conveyor system
number of linked conveyors with their ancillary equipment
3.2
belt conveyor
conveyor with an endless belt acting as a carrying and traction element
Note 1 to entry: Some shortened form of belt conveyor, normally running at slow speed, designed to extract or
control the rate of flow of bulk materials from a feed hopper (3.3.1), is called a belt feeder.
3.2.1
troughed belt conveyor
belt conveyor (3.2) where the support idlers (3.4.4) or suitable flat sliding surfaces which impart a
transverse curvature to the belt less than 45°
Note 1 to entry: If the angle between the support idlers (3.4.4) and the horizontal plane is more than 45°, a
troughed belt conveyor can be called a deep troughed belt conveyor.
3.2.2
pipe belt conveyor
pipe conveyor
belt conveyor (3.2) where the belt forms a pipe
3.2.3
walled belt conveyor
belt conveyor (3.2) where the belt has its flat carrying face extended to form side walls of limited height
3.2.4
radial conveyor
belt conveyor (3.2) which is pivoted around a fixed end and may be mounted on wheels or skids at a point
along its length, which permits movement in a horizontal arc
3.3
ancillary equipment
3.3.1
feed hopper
hopper
device at the loading point of the belt conveyor (3.2) for receiving material
Note 1 to entry: See Figure 1, key 1.
3.3.2
tripper
device usually comprising two or more pulleys (3.4.7), mounted either in a fixed position or on a travelling
carriage, for discharging material at selected points or at any point along the length of a belt conveyor
(3.2)
3.3.3
chute
pathway by which materials are guided and fall under gravity
3.4
other terms and definitions
3.4.1
skirt plate
extension to the feed hopper (3.3.1) or independent plate along the length of the conveyor for centralising
and/or retaining material on the belt
Note 1 to entry: See Figure 4, key 3.
3.4.2
take-up device
device for removing slack and applying tension to the belt
3.4.3
scraper
cleaning device fixed or flexibly mounted across the width of a belt or pulley of a conveyor, for removing
adherent material
Note 1 to entry: See Figure 1, key 14.
3.4.4
idler
mechanical element rotating on internal bearing(s) and fitted to support the belt
Note 1 to entry: On belt conveyors (3.2), several idlers can be used. These are called e.g. troughing idler (which
supports the belt and maintains it in a troughed form), carrying idler (3.4.5), return idler (3.4.6).
Note 2 to entry: See Figure 1, keys 3, 4 and 5.
3.4.5
carrying idler
idler (3.4.4) which supports the load carrying side of the belt
3.4.6
return idler
idler (3.4.4) which supports the empty return side of the belt
3.4.7
pulley
mechanical element typically rotating on external bearing and fitted to change the direction of the belt
along its circumference
Note 1 to entry: On a belt conveyor (3.2) two or more of these elements can be used. Depending on the place
where this element is used, it can be called a drive pulley (3.4.8), snub pulley (3.4.9), bend pulley (3.4.10), head pulley
(3.4.11), take-up pulley (3.4.12), tail pulley (3.4.13).
3.4.8
drive pulley
pulley (3.4.7) that drives the belt
Note 1 to entry: A drive pulley is typically a head pulley (3.4.11).
Note 2 to entry: See Figure 1, key 8.
3.4.9
snub pulley
pulley (3.4.7) used to develop the necessary arc of contact (angle of wrap) of the belt on the drive pulley
Note 1 to entry: See Figure 1, key 7.
3.4.10
bend pulley
pulley (3.4.7) used to change the direction of the belt
Note 1 to entry: See Figure 1, key 9.
3.4.11
head pulley
terminal pulley (3.4.7) at the head of a conveyor
Note 1 to entry: See Figure 1, key 6.
3.4.12
take-up pulley
movable pulley (3.4.7) used in the take-up device (3.4.2)
Note 1 to entry: See Figure 1, key 12.
3.4.13
tail pulley
terminal pulley (3.4.7) at the tail of a conveyor
Note 1 to entry: A tail pulley can be a take-up pulley (3.4.12).
Note 2 to entry: See Figure 1, key 10.
3.4.14
fixed guard
guard affixed in such a manner (for example, by screw(s), nut(s), welding) that it can only be opened or
removed by the use of tools or by destruction of the affixing means
[SOURCE: EN ISO 12100:2010, 3.27.1]
3.4.15
interlocking guard
guard associated with an interlocking device so that, together with the control system of the machine, the
following functions are performed:
— the hazardous machine functions “covered” by the guard cannot operate until the guard is closed;
— if the guard is opened while hazardous machine functions are operating, a stop command is given,
and;
— when the guard is closed, the hazardous machine functions “covered” by the guard can operate (the
closure of the guard does not by itself start the hazardous machine functions)
Note 1 to entry: EN ISO 14119:2013 gives detailed provisions.
[SOURCE: EN ISO 12100:2010, 3.27.4]
3.4.16
nip point
point which occurs on the in-running side at the line of contact between the conveyor belt and rotating
pulley and in certain cases between belt and an idler
Note 1 to entry: See Figure 1-key 15, Figure 3-key 3, Figure 4-key 9, Figure 6-key 9, Figure 8-key 3, Figure 9-key
3 and Figure 10-key 9.
3.4.17
nip guard
fixed guard (3.4.14) inserted at a nip point (3.4.16) to directly safeguard that point
Note 1 to entry: See Figure 4-key 10, Figure 6, Figure 7, Figure 8, Figure 9 and Figure 10 b)-key 17.
a) Nip points on typical belt conveyor
b) Nip points on typical c) Nip points on reversible belt conveyor
tripper
d) Nip points at idlers on e) Nip points at idlers on belt conveyor
pipe belt conveyor
Key
1 feed hopper 9 bend pulley
2 direction of belt travel 10 tail pulley
3 idler convex curve (brow) position 11 tripper discharge pulley
4 idler at current section 12 take-up pulley
5 idler at transition section 13 gravity take-up weight
6 head pulley 14 scraper
7 snub pulley 15 nip point
8 drive pulley 16 in-running nip
Figure 1 — Typical nip points and in-running nips
3.4.18
in-running nip
point which occurs on the in-running side of a moving part (e.g. the conveyor belt) passing a fixed part of
the machine (e.g. the feed hopper (3.3.1))
Note 1 to entry: For example of in-running nip, see Figure 1-key 16 and Figure 12.
3.4.19
transition section
section of a belt conveyor (3.2) in which the belt profile changes from a troughed configuration to a flat
configuration or vice versa
3.4.20
current section
section of a belt conveyor (3.2) in which the belt profile does not change
3.4.21
straight section
current section (3.4.20) of a belt conveyor (3.2) where the change of angle across an idler is less than 3°
3.4.22
work place
working place
place where operator(s) are working directly at a conveyor (inspection, maintenance and cleaning are
excluded)
3.4.23
public zone
zone where public have access
Note 1 to entry: See Figure 2, key 4.
3.4.24
traffic zone
zone which is accessible or reachable without opening a guard, activating a trip device or using an
additional means
Note 1 to entry: See Figure 2, key 3.
3.4.25
restricted zone
enclosed zone where only authorized operators who are specially skilled to do maintenance and/or
trouble shooting have access
Note 1 to entry: See Figure 2, key 2.
3.4.26
hazard zone
danger zone
any space within and/or around machinery in which a person can be exposed to a hazard
[SOURCE: EN ISO 12100:2010, 3.11]
Note 1 to entry: See Figure 2, key 1.
3.4.27
maintenance
combination of all technical and administrative measures and actions taken by management during the
life cycle of a machine that serves to maintain or restore its operational state so that it can perform the
required function
Note 1 to entry: Technical maintenance measures include the observation and analysis of the state of a machine
(e.g. investigation, monitoring, testing, diagnosis, prognosis, etc.) as well as active maintenance-conservation
measures (e.g. repair, reconditioning).
[SOURCE: EN 13306:2017, 2.1]
3.4.28
inspection
examination for conformity by measuring, observing, or testing the relevant characteristics of an item
[SOURCE: EN 13306:2017, 8.1]
4 Safety requirements and /or measures for belt conveyors
4.1 General
4.1.1 Introduction
For a list of significant hazards related to a belt conveyor, see Annex A.
The equipment shall comply with the safety, protective and/or risk reduction requirements of this clause.
In addition, equipment and systems shall be designed in accordance with the principles of
EN ISO 12100:2010 for relevant, but non significant, hazards which are not covered by this document.
4.1.2 Zone concept
Requirements in the following clauses are based on a zone concept (see Figure 2).
NOTE 1 EN ISO 12100:2010, 6.3.2 gives guidance for establishing the concept of zones.
Unless otherwise specified in this document, all requirements refer to all zones and work places. For
public zones, additional requirements can be necessary.
When designing the safety concept of the conveying system, the manufacturer shall consider the
following requirements:
— inside the restricted zone, a work place is not allowed;
— the restricted zone shall also be located outside the traffic zones;
— the restricted zone shall be designed in order that personnel do not misuse the restricted zone as a
pathway, between any traffic or work places.
NOTE 2 The restricted zone can also be at a different floor level.
NOTE 3 For maintenance and troubleshooting purposes, restricted zone(s) can be designed to allow only
authorized operators to have access.
Key
1 danger zone 3 traffic zone
2 restricted zone 4 public zone
Figure 2 — Zone concept
4.1.3 Requirements for restricted zone
The requirements in the restricted zone(s) are the same as in the traffic zone(s) unless otherwise
specified in this document.
Peripheral guards around restricted zones shall be fixed or lockable and the safety distance shall comply
with EN ISO 13857:2019. Open topped fixed guards (see 4.2.4) shall have a height of at least 1 400 mm
from the floor or the access platform.
The access openings to the restricted zones shall be designed in a way that they can be opened from
outside only with a key or an electronic device having the same effect. From inside it shall be possible to
open them without any tool. By design, the access openings shall close automatically unless otherwise
specified below. If the access openings remain open for more than 20 s, the system shall stop, according
to 4.10.2.5.
4.2 Requirements for guards
4.2.1 General
Guards shall be in accordance with EN ISO 14120:2015.
Fixings for guards shall be reachable from outside of the guarded area. Unless otherwise specified in this
document the guards shall be dimensioned and positioned so that the minimum safety distances comply
with those specified in EN ISO 13857:2019.
Where it is possible to step on a guard, it shall be designed in such a way that, after a load of 1500 N is
distributed evenly over an area of 0,2 m x 0,2 m, the guard, without contacting any moving part(s) and
compromising safety distances, remains removable and can be replaced.
Fixing of guards that have to be removed for regular maintenance, cleaning and troubleshooting, shall
remain attached to the guards or to the machinery when removing the guards.
4.2.2 Fixed guard
4.2.2.1 General
Fixed guards shall be securely fixed in position by captive type fastenings and shall only be capable of
being opened or removed with the use of a tool. The safety distance provided by fixed guards shall comply
with EN ISO 13857:2019, Table 2.
NOTE 1 For a typical fixed guard at feeding section and head pulley see Figure 4.
NOTE 2 For a typical fixed guard at convex curve see Figure 5.
If fixed guards are removable, they shall be capable of being removed and replaced without dismantling
any other part.
Key
1 distance a (see Table 1) 5 fixed guard e.g. top guard
2 direction of belt travel 6 under guard or decking plate
7 enclosure guarding
3 nip point
4 minimum to suit material 8 material discharge
Figure 3 — Principle of safeguarding at head pulley by fixed enclosure guarding
NOTE 3 It is possible to omit the under guard or decking plate between the belts if the enclosure guard extends
below the return belt. See Figure 3, key 6.
Any nip point within 2 700 mm reach, shall be protected.
Table 1 — Minimum distance of edge of fixed enclosure guard from centre line of pulley, idlers at
convex curve and idlers at transition section
Pulley, idlers at convex curve and idlers Minimum distance “a”
at transition sections
Diameter
mm mm
≤ 850 1 000
> 850 1 200
4.2.2.2 Opening(s) in fixed guard
Opening(s) in fixed guards shall comply with EN ISO 13857:2019, Tables 3, 4 or 6. Where, for operating
reasons, the opening required for the passage of belt and materials is in excess of that given in
EN ISO 13857:2019, then the guard at the opening shall extend for a minimum distance of “a”, given in
Table 1, from the centre line of the pulley (see Figure 3). If access to the dangerous parts cannot be
prevented by a fixed guard (see 4.2.4), nip guards (see 4.2.5) shall be provided.
NOTE See examples of typical arrangements for guarding pulleys in Figure 4 and Figure 8b) for tail pulley, in
Figure 6 and Figure 8a) for head pulley and in Figure 10 for gravity take-up devices.
The distance to the danger zone from the lower edge of the fixed guard shall be at least 550 mm and
clearance below fixed guards shall be maximum:
— 240 mm in restricted zone and working and traffic zone;
— 100 mm in public zone.
Key
1 distance a (see Table 1) min 7 guard-cover (for vertical guard less than 2 m hight)
2 direction of belt travel 8 walkway
3 skirt plate 9 nip point
4 feed hopper 10 nip guard
5 floor level 11 upright reach distance
6 guards to enclose idlers, tail and snub 12 clearance below fixed guard
pulleys
Figure 4 — Example of fixed guards at tail pulley, feed hopper and idlers
Key
1 distance a (see Table 1) min 4 guard-cover (for vertical guard less than 2 m hight)
2 direction of belt travel 5 guard-rail
3 walkway
Figure 5 — Example of fixed guards at convex curve
4.2.3 Interlocking guard
Interlocking guards shall comply with EN ISO 14120:2015, 3.5 and EN ISO 13855:2010, Clause 9, for
distance “S” between the interlocking guards and the hazardous area.
Interlocking devices shall comply with EN ISO 14119:2013.
4.2.4 Inspection cover
Inspection covers shall be movable interlocking guards, in accordance with 4.2.3, when the covers are
intended to be opened more frequently than once a week and expose a hazard.
If a cover is intended to be opened during running (not interlocked) to allow viewing of a danger zone,
an additional fixed guard shall be provided which prevents the danger points from being reached. This
additional fixed guard shall comply with the safety distances of EN ISO 13857:2019, Table 4 and can be
made from, for example, perforated plate or wire mesh.
For inspection covers on totally enclosed conveyors or ancillary equipment, the method of fixing, the
shape and the direction of opening, shall be in accordance with the requirements of EN ISO 14120:2015.
4.2.5 Nip guard
A nip guard shall follow the profile of the belt approaching the nip point. Clearance between the nip guard
and the pulley face and between the side of the nip guard and the end faces of the pul
...
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