Safety of machinery - Safety requirements for machinery and equipment for production of steel by electric arc furnaces

This European Standard specifies the general safety requirements for electric arc furnaces (EAF) to melt steel not containing radioactive material.
This European Standard deals with all significant hazards, hazardous situations and events pertinent to EAF, when used as intended and under conditions foreseen by the manufacturer, but also includes foreseeable faults and malfunctions in case of misuse.
This European Standard specifies also criteria for the plant and equipment integrated in the production process.
This European Standard specifies the requirements to ensure the safety of persons which are to be met during the design, assembly, transport, commissioning, operation, maintenance and decommissioning of the equipment.
This European Standard assumes that installations are operated and maintained by adequately trained and competent personnel. Manual intervention for setting, adjustment and maintenance is accepted as part of the normal use of the equipment.
This European Standard covers the following equipment (see Annex B):
   EAF with AC technology (alternating current);
   EAF with DC technology (direct current);
   scrap pre-heating technology;
   associated equipment/devices according Annex B.
The following equipment is not covered by this European Standard:
   induction furnace;
   resistance-arc furnace;
   electron beam furnace;
   plasma furnace;
   other electrical furnaces used in secondary steelmaking.
This European Standard does not specify safety requirements for the following equipment, which can be an integral or complementary part of the equipment covered by the Scope:
a)   cranes;
b)   scrap basket;
c)   transport car for scrap basket;
d)   elephant house (furnace encasing for environmental reasons);
e)   separate scrap drying equipment.

Sicherheit von Maschinen - Sicherheitsanforderungen für Anlagen und Einrichtungen zur Erzeugung von Stahl mittels Elektrolichtbogenofen

Diese Europäische Norm legt die allgemeinen Sicherheitsanforderungen für Elektrolichtbogenöfen (ELO) beim Schmelzen von Stahl ohne radioaktives Material fest.
Diese Europäische Norm legt die vorhersehbaren, signifikanten Gefährdungen, Gefährdungssituationen und
- -ereignisse für einen ELO fest, wenn dieser bestimmungsgemäß und unter vom Hersteller vorhersehbaren Zuständen genutzt wird, schließt aber auch vorhersehbare Fehler und Fehlfunktionen im Falle von Fehl¬gebrauch ein.
Diese Europäische Norm legt auch Merkmale für Anlagen und Einrichtungen fest, die in den Produktions¬prozess integriert sind.
Diese Europäische Norm legt die zu erfüllenden Anforderungen fest, um die Sicherheit von Personen während der Konstruktion, des Baus, des Transports, der Inbetriebnahme, des Betriebs, der Wartung und der Außerbetriebnahme sicherzustellen.
Diese Europäische Norm geht davon aus, dass die Anlagen von entsprechend geschultem und fähigem Personal bedient und gewartet werden. Manuelles Eingreifen zur Einstellung, Anpassung und Wartung wird als Teil des Normalbetriebs der Ausrüstung akzeptiert.
Diese Europäische Norm gilt für folgende Ausrüstung (siehe Anhang B):
   Elektrolichtbogenofen mit AC- Technologie (Wechselstrom);
   Elektrolichtbogenofen mit DC- Technologie (Gleichstrom);
   Schrottvorwärmungs- Technologie;
   zugehörige Ausrüstung/Geräte, entsprechend Anhang B.
Die nachfolgende Ausrüstung wird nicht durch diese Europäische Norm abgedeckt:
   Induktionsofen;
   Lichtbogen- Widerstandsofen;
   Elektrostrahlofen;
   Plasmaofen;
   andere Elektroöfen, die in der Sekundärmetallurgie verwendet werden.
Diese Europäische Norm legt keine Sicherheitsanforderungen an die folgende Ausrüstung fest, die ein integraler oder ergänzender Teil der Ausrüstung sein kann, die durch den Geltungsbereich abgedeckt ist:
a)   Krane;
b)   Schrottkorb;
c)   Transportwagen für Schrottkörbe;
d)   Ofen- Einhausung/Elephant house (Ofenumhüllung aus Umweltschutzgründen);

Sécurité des machines - Exigences de sécurité pour les machines et les équipements pour la production d'acier par four à arc électrique

La présente Norme européenne spécifie les exigences de sécurité générales pour les fours à arc électrique (FAE) utilisés pour la fusion de l’acier ne contenant pas matériau radioactif.
La présente Norme européenne traite tous les phénomènes, situations et événements dangereux significatifs pertinents pour les FAE, lorsqu'ils sont utilisés comme prévu et dans des conditions prévues par le fabricant, mais inclut aussi des défauts et défaillances prévisibles en cas de mauvais usage.
La présente Norme européenne spécifie aussi des critères pour l'usine et l'équipement intégré dans le processus de production
La présente Norme européenne spécifie également les exigences pour assurer la sécurité des personnes devant être satisfaites lors de la conception, de l’assemblage, du transport, de la mise en service, du fonctionnement, de la maintenance et de la mise hors service des équipements.
La présente Norme européenne suppose que les installations sont utilisées et entretenues par du personnel compétent ayant reçu une formation appropriée. Une intervention manuelle pour le réglage, l’ajustage et la maintenance est acceptée comme partie intégrante de l’utilisation normale des équipements.
La présente Norme européenne couvre les équipements suivants (voir Annexe B) :
-   fours à arc électrique avec technologie du CA (courant alternatif) ;
-   fours à arc électrique avec technologie du CC (courant continu) ;
-   technique de préchauffage des déchets ;
-   équipements/dispositifs associés selon l’Annexe B.
La présente Norme européenne ne couvre pas les équipements suivants :
   four à induction ;
-   four à résistance ;
-   four à bombardement électronique ;
-   four à plasma ;
-   autres fours électriques utilisés en métallurgie secondaire.

Varnost strojev - Varnostne zahteve za stroje in opremo za proizvodnjo jekla z električnimi obločnimi pečmi

General Information

Status
Withdrawn
Publication Date
01-Aug-2006
Withdrawal Date
06-Apr-2010
Current Stage
9960 - Withdrawal effective - Withdrawal
Due Date
07-Apr-2010
Completion Date
07-Apr-2010

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sicherheit von Maschinen - Sicherheitsanforderungen für Anlagen und Einrichtungen zur Erzeugung von Stahl mittels ElektrolichtbogenofenSécurité des machines - Exigences de sécurité pour les machines et les équipements pour la production d'acier par four a arc électriqueSafety of machinery - Safety requirements for machinery and equipment for production of steel by electric arc furnaces77.180Oprema za metalurško industrijoEquipment for the metallurgical industry25.180.10Electric furnaces13.110Varnost strojevSafety of machineryICS:Ta slovenski standard je istoveten z:EN 14681:2006SIST EN 14681:2007en01-januar-2007SIST EN 14681:2007SLOVENSKI

STANDARD
SIST EN 14681:2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14681August 2006ICS 25.180.10; 77.180 English VersionSafety of machinery - Safety requirements for machinery andequipment for production of steel by electric arc furnacesSécurité des machines - Exigences de sécurité pour lesmachines et les équipements pour la production d'acier parfour à arc électriqueSicherheit von Maschinen - Sicherheitsanforderungen fürAnlagen und Einrichtungen zur Erzeugung von Stahl mittelsElektrolichtbogenofenThis European Standard was approved by CEN on 26 June 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14681:2006: ESIST EN 14681:2007

EN 14681:2006 (E) 2 Contents Page Foreword..............................................................................................................................................................4 Introduction.........................................................................................................................................................5 1 Scope......................................................................................................................................................6 2 Normative references............................................................................................................................7 3 Terms, definitions and abbreviations..................................................................................................8 3.1 Terms and definitions...........................................................................................................................8 3.2 Abbreviations......................................................................................................................................10 4 List of significant hazards.................................................................................................................10 5 Safety requirements and/or measures.............................................................................................10 5.1 General.................................................................................................................................................10 5.1.1 General design requirements............................................................................................................10 5.1.2 Electrical melting power supply........................................................................................................11 5.1.3 Electrical low voltage supply.............................................................................................................11 5.1.4 Grounding of mechanical furnace parts..........................................................................................11 5.1.5 Fluid systems......................................................................................................................................12 5.1.6 Linked equipment...............................................................................................................................12 5.1.7 Ergonomic principles.........................................................................................................................12 5.1.8 Leakage from hydraulic system and EAF-Transformer..................................................................13 5.1.9 Access.................................................................................................................................................13 5.1.10 Safety control system........................................................................................................................13 5.1.11 Harmful areas......................................................................................................................................13 5.1.12 Blocking device for tilting platform..................................................................................................13 5.1.13 Gantry movement...............................................................................................................................14 5.1.14 Loss of energy....................................................................................................................................14 5.1.15 Electrode clamp..................................................................................................................................14 5.1.16 Pulpit....................................................................................................................................................14 5.1.17 Personal protective equipment (PPE)..............................................................................................15 5.1.18 Warning devices and safety signs......................................................................................................15 5.2 List of significant hazards, hazardous situations, safety requirements and/or measures.........15 5.2.1 EAF including scrap pre-heating......................................................................................................16 5.3 Special requirements for explosion prevention and protection....................................................19 5.4 Noise reduction as a safety requirement.........................................................................................19 5.4.1 Noise reduction at source by design................................................................................................19 5.4.2 Noise reduction by protective measures.........................................................................................20 5.4.3 Noise reduction by information.........................................................................................................20 6 Verification of the safety requirements and/or measures..............................................................20 7 Information for use.............................................................................................................................20 7.1 General.................................................................................................................................................20 7.2 Warning devices and safety signs....................................................................................................20 7.3 Accompanying documents................................................................................................................21 7.3.1 Instruction handbook.........................................................................................................................21 7.3.2 Machine/equipment declaration........................................................................................................21 7.3.3 Instruction for transportation and assembly of the equipment.....................................................21 7.3.4 Information about commissioning and dismantling of the equipment.........................................21 7.3.5 Operation instructions concerning the equipment.........................................................................22 7.3.6 Maintenance manual..........................................................................................................................22 7.4 Minimum marking...............................................................................................................................23 7.5 Training of personnel.........................................................................................................................23 SIST EN 14681:2007

EN 14681:2006 (E) 3 Annex A (normative)

Noise test code.............................................................................................................25 Annex B (normative)

Equipment covered by this European Standard.......................................................29 Annex C (informative)

Examples of electric arc furnaces............................................................................31 Annex ZA (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC............................................................................................33 Annex ZB (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC..............................................................................................34 Bibliography......................................................................................................................................................35

Figures Figure B.1 — Specification of equipment covered by this standard (solid line) and take over points of linked equipment (dashed line)...............................................................................................................30 Figure C.1 — Example of an EAF....................................................................................................................31 Figure C.2 — Example of an EAF: Single shaft furnace with scrap preheating system...........................32

Tables Table 1 — Significant hazards, hazardous situations, safety requirements and/or measures................16 Table A.1 — Example of declared dual-number noise emission values....................................................28 Table B.1 — EAF with AC technology............................................................................................................29 Table B.2 — EAF with DC technology............................................................................................................29 Table B.3 — Auxiliaries....................................................................................................................................29

SIST EN 14681:2007

EN 14681:2006 (E) 4 Foreword This document (EN 14681:2006) has been prepared by Technical Committee CEN/TC 322 “Equipments for making and shaping of metals - Safety requirements”, the secretariat of which is held by DIN. 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 February 2007, and conflicting national standards shall be withdrawn at the latest by February 2007. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annexes ZA and ZB which are integral parts of this document. This European Standard was elaborated by CEN/TC 322/WG1 comprising experts from the following countries: Austria, Germany, Italy and Sweden. NOTE Initially it was planned to prepare this European Standard as a part of the standard series EN 746 "Industrial thermoprocessing equipment". As a result of the time gap between the elaboration of EN 746-1:1997 and this European Standard the goal could not be achieved because of a diverging technical level in both standards. For the next revision of both standards it is foreseen to reconsider the initial plan. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, 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. SIST EN 14681:2007

EN 14681:2006 (E) 5 Introduction This European Standard is a type C standard as stated in EN ISO 12100. The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this European Standard. 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 machines that have been designed and built according to the provisions of this type C standard. Where for clarity an example of a preventive measure is given in this European Standard, this should not been considered as the only possible solution. Any other solution leading to the same risk reduction is permissible if an equivalent level of safety is achieved.

SIST EN 14681:2007

EN 14681:2006 (E) 6 1 Scope This European Standard specifies the general safety requirements for electric arc furnaces (EAF) to melt steel not containing radioactive material. This European Standard deals with all significant hazards, hazardous situations and events pertinent to EAF, when used as intended and under conditions foreseen by the manufacturer, but also includes foreseeable faults and malfunctions in case of misuse. This European Standard specifies also criteria for the plant and equipment integrated in the production process. This European Standard specifies the requirements to ensure the safety of persons which are to be met during the design, assembly, transport, commissioning, operation, maintenance and decommissioning of the equipment. This European Standard assumes that installations are operated and maintained by adequately trained and competent personnel. Manual intervention for setting, adjustment and maintenance is accepted as part of the normal use of the equipment. This European Standard covers the following equipment (see Annex B):  EAF with AC technology (alternating current);  EAF with DC technology (direct current);  scrap pre-heating technology;  associated equipment/devices according Annex B. The following equipment is not covered by this European Standard:  induction furnace;  resistance-arc furnace;  electron beam furnace;  plasma furnace;  other electrical furnaces used in secondary steelmaking. This European Standard does not specify safety requirements for the following equipment, which can be an integral or complementary part of the equipment covered by the Scope: a) cranes; b) scrap basket; c) transport car for scrap basket; d) elephant house (furnace encasing for environmental reasons); e) separate scrap drying equipment.

SIST EN 14681:2007

EN 14681:2006 (E) 7 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. EN 294, Safety of machinery — Safety distances to prevent danger zones being reached by the upper limbs EN 418, Safety of machinery — Emergency stop equipment, functional aspects — Principles for design EN 614-1, Safety of machinery — Ergonomic design principles — Part 1: Terminology and general principles EN 811, Safety of machinery — Safety distances to prevent danger zones being reached by the lower limbs EN 842, Safety of machinery — Visual danger signals — General requirements, design and testing EN 954-11, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design EN 981, Safety of machinery — System of auditory and visual danger and information signals EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components — Hydraulics EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components — Pneumatics EN 1037, Safety of machinery — Prevention of unexpected start-up EN 1050, Safety of machinery — Principles for risk assessment EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — Principles for design and selection EN 1127-1, Explosive atmospheres — Explosion prevention and protection — Part 1: Basic concepts and methodology EN 12464-1, Light and lighting — Lighting of work places — Part 1: Indoor work places EN 13463-1:2001, Non-electrical equipment for potentially explosive atmospheres — Part 1: Basic method and requirements EN 13463-5, Non-electrical equipment intended for use in potentially explosive atmospheres — Part 5: Protection by constructional safety “c” EN 60079-0, Electrical apparatus for explosive gas atmospheres — Part 0: General requirements (IEC 60079-0:2004) EN 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:1997) EN 60204-11; Safety of machinery — Electrical equipment of machines — Part 11: Requirements for HV equipment for voltages above 1000 V a.c. or 1500 V d.c. and not exceeding 36 kV (IEC 60204- 11:2000)

1) Will be replaced by prEN ISO 13849-1. SIST EN 14681:2007

EN 14681:2006 (E) 8 EN 60519-4:1997, Safety in electroheat installations — Part 4: Particular requirements for arc furnace installations (IEC 60519-4:1995) EN 61310-1, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual, auditory and tactile signals (IEC 61310-1:1995) EN 61310-2, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for marking (IEC 61310-2:1995) EN ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and equipment (ISO 4871:1996) EN ISO 6682, Earth-moving machinery — Zones of comfort and reach for controls (ISO 6682:1986 including Amendment 1:1989) EN ISO 7731, Ergonomics — Danger signals for public and work areas — Auditory danger signals (ISO 7731:2003) EN ISO 11202:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound pressure levels at a work station and at other specified positions — Survey method in situ (ISO 11202:1995) EN ISO 11688-1, Acoustics — Recommended practice for the design of low-noise machinery and equipment — Part 1: Planning (ISO/TR 11688-1:1995) EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic terminology, methodology (ISO 12100-1:2003) EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical principles (ISO 12100-2:2003) EN ISO 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, 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 7000, Graphical symbols for use on equipment — Index and synopsis 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purpose of this document, the terms and definitions given in EN ISO 12100:2003 and the following apply. NOTE Definition used in EN and ISO standards referred to in this European Standard are also valid for this European Standard. SIST EN 14681:2007

EN 14681:2006 (E) 9 3.1.1 charge material material which is charged into the furnace, e.g. steel scrap 3.1.2 standard cycle time period between two consecutive tappings with defined power-on and power-off time 3.1.3 hydraulic fluid fluid used to transmit force via hydraulic pressure (see EN ISO 6743-4) 3.1.4 fire-resistant fluid fluid with low flame propagation (see ISO 5598) 3.1.5 ladle vessel to collect, transport and discharge molten steel 3.1.6 pulpit room in which the control desk and monitoring facilities for a machine or equipment are located 3.1.7 control stand free standing control desk to operate the equipment locally 3.1.8 tilting movement of the furnace to discharge molten steel or slag from foreseen openings 3.1.9 blocking device device to block the equipment in the desired position 3.1.10 high voltage switch gear furnace breaker to connect and disconnect the EAF to/from electrical high voltage supply 3.1.11 reactor device to increase the reactance of the EAF system 3.1.12 furnace transformer device for the transformation of the high voltage electrical supply to arc voltage 3.1.13 alloying system device to store and feed any metallic and non-metallic materials to/into the EAF 3.1.14 electrode nippling system device, in which electrode strands can be stored or new electrode sections are added 3.1.15 dog house furnace enclosure serving as indirect fume extraction system and minimising noise propagation SIST EN 14681:2007

EN 14681:2006 (E) 10 3.1.16 fume extraction system equipment for the collection of created off-gas during operation (direct and/or indirect system) 3.1.17 bus bar system high-current connection-line between transformer and cable 3.1.18 linked equipment equipment which may be connected to an EAF 3.1.19 trained personnel persons with the knowledge of systems, background, experience and ability to operate and/or maintain the equipment in the way intended 3.2 Abbreviations For the purpose of this document, the following abbreviations apply. AC Alternating Current; DC Direct Current; EAF Electric Arc Furnace. 4 List of significant hazards This clause contains all significant hazards, hazardous situations and events, as far as they are dealt with in this European Standard, identified by risk assessment as significant for this type of machinery and which requires action to eliminate or reduce the risk: a) potentially hazardous situations having significant risks; b) the safety requirements and/or measures which shall be incorporated into the machinery/equipment; c) special instructions which shall be communicated to the user. The significant hazards and hazardous situations identified are listed in columns 1 and 2 of 5.2, Table 1. In addition it is important for the manufacturer to carry out a risk assessment according to

EN 1050 to identify any other relevant hazard of the machine/equipment and take measures to eliminate or minimize the risk. 5 Safety requirements and/or measures 5.1 General 5.1.1 General design requirements Electric arc furnace and equipment conforming to this European Standard shall comply with the safety requirements and/or measures of this clause. This European Standard assumes that: SIST EN 14681:2007

EN 14681:2006 (E) 11  machinery and equipment are operated and maintained by adequately trained and competent personnel. Manual intervention for setting, adjustment and maintenance is accepted as part of the normal use of the equipment;  machinery is used with adequate workplace lighting conforming to EN 12464-1 or to local regulations. The manufacturer shall undertake and record design calculations of the structural assembly, e.g. steel sections, auxiliaries and service as part of the equipment which shall be stable, suitable for function and intended use. Safety devices shall be protected against damage. In particular, they shall be robust to withstand continuous operation in the respective area. In particular the design shall include requirements and constructional details with respect to, e.g.:  accessibility;  guards and protection;  maintenance openings and clearance gaps for cleaning;  escape routes;  movement of machinery and material;  safety during operation;  safety devices, e.g. hold-to-run control, emergency stop;  requirements for fluid and gas systems;  slag area, e.g. heat protected;  emergency pit for liquid steel being able to contain the volume of the EAF. 5.1.2 Electrical melting power supply The electrical melting power supply, comprising of the high voltage switch gear, reactor (if applicable), furnace transformer, AC/DC converters (if applicable) and interconnecting bus bar systems and cables, shall meet the requirements as defined in EN 60204-1 and/or EN 60204-11. 5.1.3 Electrical low voltage supply The electrical low voltage supply, comprising of low voltage switch gear, control system and low voltage cables, shall meet the requirements as defined EN 60204-1 and/or EN 954-1. 5.1.4 Grounding of mechanical furnace parts To prevent potential differences between mechanical furnace parts, all of these parts shall be connected to each other and grounded according Clause 10 of EN 60519-4:1997. SIST EN 14681:2007

EN 14681:2006 (E) 12 5.1.5 Fluid systems 5.1.5.1 Hydraulic and pneumatic fluid systems Hydraulic and pneumatic fluid systems and their components shall meet the requirements as defined in EN 982 and EN 983. Instruction shall be given in the information for use about systems filled with fluids, which are likely to solidify and/or change viscosity under extreme environmental temperatures and which may cause hazardous situations. Cooling systems, hydraulic and lubrication systems shall account for risks created by temperature and pressure, ignition sources, including fire and toxic effects, as well as gas/dust reactions. Instructions shall be given for small and large water leakages inside the furnace. In case of large leakages, indications of differential water flow shall be given to the control system for an emergency shut-off. No furnace movement shall take place prior all water is evaporated. Fluids, which have to be discharged into dedicated sumps, shall be specified. Equipment which is needed for discharge shall be provided. Instructions for discharge shall be given in the information for use. 5.1.5.2 Molten material Slag from furnace shall be guided to slag area (e.g., slag pot, slag pit) to prevent splashing. Water and/or moisture shall be avoided at slagging and tapping area. Foundation shall be walled by refractory lining. Instruction shall be given, see 7.3.5. 5.1.6 Linked equipment Equipment linked to the EAF such as:  alloying system (tanks/vessels, structures, discharge/conveyor devices etc.),  fume extraction,  dog house,  injection systems,  electrode nippling station,  temperature and sampling equipment,  auxiliary equipment and systems shall be defined in the documentation and data and safety devices with respect to take over points shall be given (see also Figure B.1 and 7.3.4). 5.1.7 Ergonomic principles Due to the process-heat the equipment for sampling and temperature measuring requires a long balanced lever and the tasks for sampling and temperature measuring shall be possible to do in accordance with good ergonomic principles according EN 614-1. SIST EN 14681:2007

EN 14681:2006 (E) 13 When lifting or handling heavy equipment on non-stable surfaces the risk for back injuries is high. Filling of fine grained material or other substances that can cause slippery surfaces should be done in such way that no spillage occurs. All areas where maintenance staff have to work shall be easy to reach and easy to evacuate. 5.1.8 Leakage from hydraulic system and EAF-Transformer In case fluids may leak, respective pits or collectors shall be provided. 5.1.9 Access All parts of equipment, e.g. control stands, pulpits, underground areas, inspection and service floors, which personnel is required to have access for operation, service or maintenance shall be provided with adequate means of access. Such means of access like stairways, walkways, platforms etc. shall be designed in accordance with EN 294, EN 811 and EN ISO 14122-1 to EN ISO 14122-4. Where required, they shall be protected against heat radiation, splashing material and jets of high pressure fluids. Surfaces for walking or working platforms shall be so designed that the risks of slips, trips and falls caused by scale, oil, emulsion and/or lubricant or fine grained material are avoided or minimized. Access on furnace roof/gantry during power on shall be avoided by activating an interlocking device according 5.3 of EN 1088:1995 which switch-off the power supply by opening the furnace breaker. 5.1.10 Safety control system Each safety control shall be selected in accordance with the severity of the risk as described in EN 954-1. The function of each safety co

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