SIST EN 741:2001+A1:2011

SLOVENSKI STANDARD
SIST EN 741:2001+A1:2011
01-februar-2011
1DGRPHãþD
SIST EN 741:2001
1DSUDYHLQVLVWHPL]DNRQWLQXLUQLWUDQVSRUW9DUQRVWQH]DKWHYH]DVLVWHPHLQ
QMLKRYHNRPSRQHQWH]DSQHYPDWVNRPDQLSXODFLMRVLSNHJDPDWHULDODYNOMXþQR]
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Continuous handling equipment and systems - Safety requirements for systems and their
components for pneumatic handling of bulk materials
Stetigförderer und Systeme - Sicherheitsanforderungen an Systeme und ihre
Komponenten zur pneumatischen Förderung von Schüttgut
Equipements et systèmes de manutention continue - Prescriptions de sécurité pour les
systèmes et leurs composants pour la manutention pneumatique des produits en vrac
Ta slovenski standard je istoveten z: EN 741:2000+A1:2010
ICS:
53.040.30 3QHYPDWLþQLWUDQVSRUWLQ Pneumatic transport and its
QMHJRYLVHVWDYQLGHOL components
SIST EN 741:2001+A1:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 741:2001+A1:2011

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SIST EN 741:2001+A1:2011


EUROPEAN STANDARD
EN 741:2000+A1

NORME EUROPÉENNE

EUROPÄISCHE NORM
December 2010
ICS 53.040.30 Supersedes EN 741:2000
English Version
Continuous handling equipment and systems - Safety
requirements for systems and their components for pneumatic
handling of bulk materials
Equipements et systèmes de manutention continue - Stetigförderer und Systeme - Sicherheitsanforderungen an
Prescriptions de sécurité pour les systèmes et leurs Systeme und ihre Komponenten zur pneumatischen
composants pour la manutention pneumatique des produits Förderung von Schüttgut
en vrac
This European Standard was approved by CEN on 1 July 1999 and includes Amendment 1 approved by CEN on 16 November 2010.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 741:2000+A1:2010: E
worldwide for CEN national Members.

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
Contents
Foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 List of hazards . 20
5 Safety requirements and/or safety measures . 20
6 Verification of safety requirements and/or measures . 24
7 Information for use . 26
Annex A (normative) List of hazards according to !!!!EN ISO 12100-1"""" in comparison with annex I of
the "Machinery Directive". . 31
Annex B (informative) Bibliography . 33
Annex C (informative) Fire or explosion hazard . 34
Annex ZA (informative) !!!!Relationship between this European Standard and the Essential
Requirements of the EU Directive 2006/42/EC"""" . 35

2

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
Foreword
This document (EN 741:2000+A1:2010) 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 June 2011, and conflicting national standards shall be withdrawn at the latest by
June 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document includes Amendment 1, approved by CEN on 2010-11-16.
This document supersedes EN 741:2000.
The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ".
This European Standard has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard.
This standard forms 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 and EMC requirements for equipment for
mechanical handling of unit loads"
EN 620, !Continuous handling equipment and systems — Safety and EMC 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
!deleted text"
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
3

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
Introduction
This European standard is a type C standard as defined in !EN ISO 12100-1".
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of the other standards, for systems and
components that have been designed and built according to the provisions of this type C standard.
While producing this standard it was assumed that:
- only trained persons operate the machine;
- parts without specific requirements are:
a) designed in accordance with the usual engineering practice and calculation codes, including all failures
modes;
b) of sound mechanical and electrical construction;
c) made of materials with adequate strength and of suitable quality;
d) made of materials free of defects;
- harmful materials, such as asbestos are not used as part of the system and components;
- components and system are kept in good repair and working order, so that the required characteristics remain
despite wear;
- by design of the load bearing elements, a safe operation of the system and components is assured for loading
ranging from zero to 100 % of the rated possibilities and during the tests;
- the ambient air temperature is maintained between - 15 °C and + 40 °C;
- the relative humidity is kept between limits which do not impede the safe working of the system and
components;
- the components (see clause 3.4) are not exposed to external vibration;
!deleted text"
- a negotiation takes place between the user / installer and the manufacturer concerning the particular
conditions for the use and places of use of the machinery;
- the working area is adequately lit;
- the places of installation allow a safe use of the system;
- safety data sheets on the bulk materials to be conveyed are provided by the user / installer and are part of the
design criteria.
EN 617, EN 618 and EN 620 may need to be considered for a complete continuous handling system (machine).
4

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
1 Scope
1.1 This standard specifies the special safety requirements for those types of fixed pneumatic handling systems
and components as defined in clause 3, which are designed for conveying bulk materials on a continuous or an
intermittent basis (batch conveying system) from the loading point(s) to the unloading point(s).
1.2 This European standard deals with the technical requirements to minimise the hazards listed in clause 4
which can arise during the operation and the maintenance of the pneumatic conveying system. when carried out in
accordance with the specifications given by the manufacturer or his authorised representative.
Annex A gives a list of hazards according to !EN ISO 12100-1". and the safety requirements and/or measures
are specified in the same order as they are given in Annex A.
1.3 This standard applies to design, on site assembly, and commissioning stages.
1.4 This standard applies also to the built-in actuators and parts of the systems, which control the components.
1.5 Exclusions
This standard does not specify the requirements for any elements used as a link between a fixed part(s) of the
system and any other part mounted on mobile/movable supports (e.g.: ship, unloaders, .).
This standard does not take into account the risks of burns and scalds by the radiation of heat sources or by
contact with hot gases.
This standard does not take into account the risk generated by ionising materials used in measuring equipment
(e.g. level indicators).
This standard does not specify the requirements for handling specific hazardous materials, such as radiating
material, explosives, explosive gases, .
This standard does not specify the requirements for hazards due to electrostatic charges of pipes and equipment
made of non-metallic materials.
The safety requirements for the transportation including loading and unloading of the components are not covered
by this standard.
This standard does not apply to pneumatic conveying systems used underground, for mining and in public areas.
This European standard does not establish the additional requirements for: freezer applications, high temperatures,
corrosive environments, strong magnetic fields, potentially explosive atmospheres, radioactive environment,
operation on ships and earthquake effects, hazards during decommissioning.
!This standard does not specify the requirements for hazards due to noise."
2 Normative references
!The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies."
!deleted text"
EN 349:1993, Safety of machinery — Minimum gaps to avoid crushing of parts of the human body
!deleted text"
EN 953:1997, Safety of machinery — Guards — General requirements for the design and construction of fixed and
movable guards
EN 1037:1995, Safety of machinery — Prevention of unexpected start-up
5

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
EN 1050:1996, Safety of machinery — Risk assessment
EN 1070: 1998, Safety of machinery — Terminology
EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — Principles for design and
selection
EN 1127-1:1997, Safety of machinery — Fire and explosions — Part 1: Explosion prevention and protection
!deleted text"
EN 50014:1992, Electrical apparatus for potentially explosive atmospheres — General requirements
EN 50082-2:1995, Electromagnetic compatibility — Generic immunity standard — Part 2: Industrial environment
!EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
(IEC 60204-1:2005, modified)"
EN 60529:1991, Degrees of protection provided by enclosures (code IP)
EN 61310-2:1995, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for marking
EN 1672-2:1997, Food processing machinery — Basic concepts — Part 2: Hygiene requirements
CENELEC R044-001:1999, Guidance and recommendations for the avoidance of hazards due to static electricity
!EN ISO 12100-1, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic
terminology, methodology (ISO 12100-1:2003)"
!EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2:
Technical principles (ISO 12100-2:2003)"
!EN ISO 13732-1, 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 13850, Safety of machinery — Emergency stop — Principles for design (ISO 13850:2006)"
!EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by upper
and lower limbs. (ISO 13857:2008)"
!EN ISO 14122-1, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of fixed
means of access between two levels (ISO 14122-1:2001)"
!EN ISO 14122-2:2001, Safety of machinery — Permanent means of access to machinery — Part 2: Working
platforms and walkways (ISO 14122-2:2001) "
!EN ISO 14122-3, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs,
stepladders and guard-rails (ISO 14122-3:2001)"
!EN ISO 14122-4, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders
(ISO 14122-4:2004)"
ISO 3864:1984, Safety colours and safety signs
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply in addition to those stated in
EN 1070:
6

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.1
pneumatic conveying system
a system (see 3.2 and 3.3) for the pneumatic conveying of loose bulk materials in pipes (ducts) by means of gas,
usually air, including the piping and components (see 3.4) and limited to them
3.2 systems related terms
3.2.1
open and closed systems
open systems operate on a once-through basis with regard to the conveying gas. In closed systems the conveying
gas is recirculated and all or part of this gas is reused
3.2.2
continuous and batch conveying systems
continuous conveying systems are those in which flow of gas and material is not interrupted during operation. In
batch conveying systems individual batches of material are conveyed on an intermittent basis
3.2.3
fixed systems
fixed systems are those where the relative position of all components is fixed. This includes:
- parts of the system mounted on mobile/movable supports (structure);
- flexible connecting piping between rigid piping.
3.3
systems and limits of systems
on the schematic drawings below, the limit of the system is defined by the black part of the flag
7

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.3.1
simple pressure conveying system
pneumatic conveying under pressure by blowing, with discharge into a single separator of gas and material, which
is also a material-receiving vessel (see Figure 1)

Key
1 EN 741/other
2 Storage hopper
3 Gas supply
4 Filter
5 Discharge hopper
Figure 1 - Example of a typical simple pressure conveying system
8

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.3.2
simple suction conveying system
pneumatic conveying under suction, with discharge into a single separator of gas and material, which is also a
material receiving vessel (see Figure 2)


Key
1 EN 741/other
2 Storage hopper
3 Filter
4 Discharge hopper
Figure 2 - Example of a typical simple suction conveying system
9

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.3.3
multi discharge conveying system
pneumatic conveying by blowing or suction with discharge into several separators of gas and material, which are
also material receiving vessels (see Figure 3)



Key
1 EN 741/other
2 Storage hopper
3 Gas supply
4 Filter
5 Discharge hopper
Figure 3 - Example of a typical multi discharge conveying system (pressure conveying system)
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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.3.4
multi pick up conveying system
pneumatic conveying under suction or blowing, with multiple feeder units and with one or more separators of gas
and material which are also material receiving vessels (see Figure 4)


Key
1 EN 741/other
2 Storage hopper
3 Gas supply
4 Filter
5 Discharge hopper
Figure 4 - Example of a typical multi pick up conveying system (pressure conveying system)
11

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.3.5
combined suction / pressure conveying system
pneumatic conveying under suction to a single separator of gas and material which is also a material-receiving
vessel. The same unit provides a pressure system to one or more separators of gas and material which are also
material receiving vessels (see Figure 5)


Key
1 EN 741/other
2 Storage hopper
3 Suction line
4 Pressure line
5 Filter
6 Discharge hopper
Figure 5 - Example of a typical combined suction pressure conveying system
12

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.3.6
closed loop conveying system
pneumatic conveying under blowing or suction with discharge into a separator of gas and material which also
serves as a material-receiving vessel. The gas is drawn back into the system (see Figure 6)


Key
1 EN 741/other
2 Storage hopper
3 Filter
4 Discharge hopper
Figure 6 - Example of a typical closed loop conveying system
13

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.4 components
3.4.1
rotary valve feeder
continuous volumetric dosing element within a housing consisting of a rotating shaft with several blades which
transports the material from the inlet to the outlet. Many types are available including blow through and drop
through type valve feeder (see Figure 7)



Figure 7 - Example of a typical drop through rotary valve feeder
14

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.4.2
pressure screw feeder
a feeder used for introducing material into systems working above atmospheric pressure. The material is
compacted, forming a seal against line pressure (see Figure 8)


Key
1 Material
2 Non return valve
3 Gas + material
4 Gas
Figure 8 - Example of a typical pressure screw feeder
15

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.4.3
venturi feeder
a feeder used for introducing material into systems working above atmospheric pressure. High gas velocity
decreases the pressure in the throat in order to encourage material to flow more readily under gravity into the
pipeline (see Figure 9)


Key
1 Material
2 Gas
3 Material + Gas
Figure 9 - Example of a typical Venturi feeder
16

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.4.4
gate valve feeder
discontinuous volumetric dosing element with one or more chambers filled and discharged sequentially (see
Figure 10). Used for pressure and suction conveying duties


Key
1 Material
2 Gas
3 Material + Gas
Figure 10 - Example of a typical gate valve feeder
17

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.4.5
suction nozzle
a feeder used for introducing material into systems working below atmospheric pressure (see Figure 11). Suction
nozzles are generally moved during operation. This facility is provided by means of flexible joints, telescopic
sections or flexible hose sections of pipeline


Key
1 Gas + material
2 Gas inlet
3 Material
Figure 11 - Example of a typical suction nozzle
18

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.4.6
blow tank (pressure vessel)
Discontinuous or batch type pressure feeders. Two or more blow tanks may be combined to give continuous
operation. A large number of types are available, for example: bottom or top discharge, with or without fluidisation
device (see Figure 12)


Key
1 Gas
2 Material
3 Material + gas
Figure 12 - Example of a typical top discharge blow tank
19

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
3.4.7
diverters
a device to direct the flow of material in a pipeline to alternative destinations (see Figure 13, 14 and 15)








Figure 13 - plug diverter Figure 14 - flap diverter Figure 15 - multiway diverter
(Typical example) (Typical example) (Typical example)
3.5
piping
any combination of fittings with flexible or rigid pipes which allow the gas and the conveyed bulk materials to flow
between components
3.6 area
3.6.1
working area
an area where persons work at or operate conveyors under normal conditions (Inspection, maintenance and
cleaning are excluded)
3.6.2
traffic area
an area which is accessible or reachable to all persons without opening a guard, activating a trip device or using
additional means
3.7
installer
Assembler of the system and components covered by this standard
4 List of hazards
This clause (see annex A) contains all the hazards, as far as they are dealt with in this standard, identified by risk
assessment significant for this type of equipment and systems and which require action to eliminate or reduce the
risk.
5 Safety requirements and/or safety measures
Systems and their components shall comply with the safety requirements and/or measures of this clause. In
addition, the systems and their components shall be designed according to the principles of !EN ISO 12100"
for hazards relevant but not significant which are not dealt with by this standard.
20

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
5.1 Mechanical hazards
5.1.1 Crushing hazard
Minimum gaps according EN 349 Table 1 and/or fixed guards or interlocking guards shall be provided to protect
operators from crushing hazards caused by moving parts of the components.
In the event of a risk arising from crushing hazards due to suction nozzles being moved, visual warning signals,
such as flashing lamps shall be provided in the area next to the nozzles. The signal shall be automatically turned
on when the remote operated nozzle is being moved.
5.1.2 Shearing hazard
Minimum gaps according EN 349, Table 1 and/or fixed guard or interlocking guards shall be provided to protect
operators from shearing hazards caused by moving parts of the components.
All components with automatic control (e.g. multiway diverters or rotary valves) shall be protected by means of a
guard or crankcase, in accordance with !EN ISO 13857:2008", 4.5 and, Table 4 in order to prevent access to
the moving parts of the machine.
When the inlet or the outlet of a rotary feeder is open, a pipe length, which complies with the safety distances,
specified in the !EN ISO 13857" standard or a fixed distance guard shall be provided to prevent access to the
rotor. When this is not possible, a guard (e.g.: a grating), in accordance with !EN ISO 13857", shall be fitted.
5.1.3 Entanglement hazard
Safeguards for hazards arising at rotating shafts and couplings, chains and chain wheels, gears and power
transmissions, belts and pulleys shall be made by means of fixed guards or interlocking guards and in accordance
with the requirements of !EN ISO 13857:2008", Table 4 and as defined in EN 1088, 3.2or in of EN 953, 3.2 or
3.5.
5.1.4 Drawing-in or trapping hazard
Where a gas inlet of a suction nozzle shall allow a sphere with a diameter of 120 mm to pass through the guard, it
shall be equipped with a guard, e.g. suitable grill, perforated sheet. The dimension of this guard shall be selected
according the material size and shall not allow a sphere with a diameter of 120 mm to pass through it.
Where there is a danger of a drawing-in or a trapping hazard, the gas inlet of a suction nozzle shall be equipped
with a device for cutting off the vacuum, e.g. emergency stop device or release valve.
In the event of risks arising from entanglement, drawing in or trapping hazards due to suction nozzles, visual
warning devices shall be provided. Visual warning signal such as flashing lamps shall indicate that the machine is
operating and shall be provided in the area next to the nozzles.
NOTE See 7.1.2 below for the requirements on the auditory warning device which indicates an impending start of the
system for 5 sec minimum in the working area next to the nozzle.
5.1.5 Impact hazard
Conveying pipes, which can move during operating conditions (e.g. flexible pipe) shall be routed and made secure
so that hazards to operators are avoided, (see 5.1.6.2).
Piping movement or shocks can occur in plug or slug flow mode due to dynamic forces. Limiting the piping
displacement (e.g. with additional supports) shall reduce impact hazard.
5.1.6 Ejection of parts of machinery, handled materials and conveying gazes
5.1.6.1 Ejection of part of machinery
Any pressure change in the system beyond the design limits of the system shall be prevented by appropriate
measures e.g. relief valves or bursting discs.
21

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SIST EN 741:2001+A1:2011
EN 741:2000+A1:2010 (E)
Relief valves or other appropriate devices shall be designed in such a way that they can be positioned so that
ejection to traffic or working areas is avoided when activated.
5.1.6.2 Ejection of handled materials
Relief valves or other appropriate devices shall be designed in such a way that they can be positioned so that
ejection to traffic or working areas is avoided when activated.
Special attention shall be paid at the design stage when abrasive material is conveyed.
5.1.6.3 Hazards due to gases (other than air) used for conveying
Any discharge points (e.g. relief valves) shall allow the gas to be discharged safely.
NOTE Safe discharge may be obtained with e.g. a gas-tight duct to guide the gas to a safe area in order to prevent gas
accumulation in confined spaces around the system.
5.2 Electrical hazards
5.2.1 Electrical equipment
The electrical equipment of components shall be provided in accordance with all applicable clauses of
!EN 60204-1", together with the particular requirements below.
5.2.1.1 Environment
The installer shall select and install electrical equipment, which is suitable for the intended-working environment.
Enclosures (cabinets, boxes, compartments, motor casings) for the electrical equipment shall provide suitable
protection (see EN 60529 and !EN 60204-1:2006", 12.3 and 15.2).
If the conveyor is for use in special conditions outside the scope of !EN 60204-1", e.g. ambient temperature,
component temperature, humidity, altitude, corrosive atmosphere, the manufacturer shall take account of this in the
design.
5.2.1.2 Wiring
...