Bsi bs en 00746 8 2000

BRITISH STANDARD Industrial thermoprocessing equipment Ð Part 8: Particular safety requirements for quenching equipment The European Standard EN 746-8:2000 has the status of a British Standard ICS 25.180.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BS EN 746-8:2000 BS EN 746-8:2000 National foreword This British Standard is the official English language version of EN 746-8:2000 The UK participation in its preparation was entrusted by Technical Committee MCE/3, Safeguarding of machinery, to Subcommittee MCE/3/8, Thermoprocessing equipment - Safety, which has the responsibility to: Ð aid enquirers to understand the text; Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK A list of organizations represented on this subcommittee can be obtained on request to its secretary Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages to 35 and a back cover The BSI copyright notice displayed in this document indicates when the document was last issued This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 November 2000  BSI 11-2000 ISBN 580 35980 Amendments issued since publication Amd No Date Comments EUROPEAN STANDARD EN 746-8 NORME EUROPÉENNE EUROPÄISCHE NORM September 2000 ICS 25.180.01 English version Industrial thermoprocessing equipment - Part 8: Particular safety requirements for quenching equipment Equipements thermiques industriels - Partie 8: Prescriptions particulières de sécurité pour les équipements de trempe Industrielle Thermoprozeßanlagen - Teil 8: Besondere Sicherheitsanforderungen an Abschreckanlagen This European Standard was approved by CEN on 22 November 1999 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 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Central Secretariat: rue de Stassart, 36 © 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members B-1050 Brussels Ref No EN 746-8:2000 E Page EN 746-8:2000 Contents Page FOREWORD INTRODUCTION SCOPE NORMATIVE REFERENCES 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 DEFINITIONS Enclosed Chamber Quenching Media Flood Quench Open Quench Press Quench Small Tank Medium Tank Large Tank Closed Tank 6 6 6 6 7 LIST OF HAZARDS SAFETY REQUIREMENTS AND/OR MEASURES 5.1 General 5.2 Layout 5.3 Design and Construction of Quench Tanks 5.4 Exhaust and Ventilation Systems 5.5 Cooling Systems (where provided) 5.6 Tracing and Jacketing 5.7 Heating Systems 5.8 Component Handling 5.9 Controls and Alarms 5.10 Quenchant Level and Effective Depth 5.11 Plant/Equipment Details 5.12 Fire Precautionary Arrangements 5.13 Ergonomic Requirements 11 11 12 12 14 15 16 17 17 20 21 23 25 27 VERIFICATION OF SAFETY REQUIREMENTS AND/OR MEASURES 27 7.1 7.2 7.3 7.4 7.5 7.6 INFORMATION FOR USE General Specific Information To Be Provided Marking of quench equipment User's information Care Maintenance of the equipment 28 28 28 29 30 30 30 ANNEX A (INFORMATIVE) Examples of quenching equipment 32 ANNEX ZA (INFORMATIVE) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives 35 Page EN 746-8:2000 FOREWORD This European Standard has been prepared by Technical Committee CEN/TC 186 "Industrial thermoprocessing - Safety", 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 March 2001, and conflicting national standards shall be withdrawn at the latest by March 2001 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 According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom The working group that drafted this Part of EN 746 comprised experts from the following countries: France, Germany, Italy, Sweden and United Kingdom This standard forms one part of a series safety standards covering Industrial Thermoprocessing Equipment The full list of parts of EN 746 is given below: EN 746 Industrial Thermoprocessing Equipment Part 1: Common Safety Requirements for Industrial Thermoprocessing Equipment Part 2: Safety Requirements for Combustion and Fuel Handling Systems Part 3: Safety Requirements for the Generation and Use of Atmosphere gases Part 4: Particular Safety Requirements for Hot Dip Galvanising Thermoprocessing Equipment Part 5: Particular Safety Requirements for Salt Bath Thermoprocessing Equipment Part 6: Particular Safety Requirements for Material Melting, Remelting and Liquid Phase Maintaining Thermoprocessing Equipment Part 7: Particular Safety Requirements for Vacuum Thermoprocessing Equipment Part 8: Particular Safety Requirements for Quenching Equipment Page EN 746-8:2000 An assessment of the foreseeable risks arising from the use of the equipment was carried out when this standard was prepared The annexes A and ZA are informative INTRODUCTION The EN 746-1 General Safety Requirements contains the common safety provisions and devices for all types of industrial thermoprocessing equipment This part of the standard details in addition those extra safety requirements which need special attention against quenching equipment This European Standard is a type C standard as defined in EN 292:1991 The extent to which hazards are covered is indicated in the scope of this standard SCOPE This part of EN 746 gives the specific hazards and safety requirements that shall be provided by the manufacturer for Quenching Equipment, whether it is used as an independent unit or an integrated part of a plant This part of EN 746 does not cover specific hazards and safety requirements for Salt Bath bath equipment used as a quenching means (see EN 746-5:2000) This part of EN 746 does not cover the handling, storage, transport, disposal, transfer or regeneration of the quenching media and processed material outside the limits of the equipment This part of EN 746 standard applies not only to the normal operation of the equipment but also to the safety of personnel and property when foreseeable faults occur in them Examples of quenching equipment are shown in Fig and Fig NOTE: There are many variations in the design of quenching equipment Only two examples of the various types are given in this text NORMATIVE REFERENCES This European Standard incorporates by dated or undated references, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies EN 166 Personal eye-protection - Specifications Page EN 746-8:2000 EN 292-1:1991 Safety of machinery - Basic concepts, general principles for design Part 1: Basic terminology, methodology EN 292-2:1991 Safety of machinery - Basic concepts, general principles for design Part 2: Technical principles and specifications EN 345 Specification for safety footwear for professional use EN 346 Specification for protective footwear for professional use EN 469 Protective clothing for firefighters - Requirements and test methods for protective clothing for firefighting EN 531 Protective clothing for industrial workers exposed to heat (excluding fire fighters' and welders' clothing) EN 614-1 Safety of machinery - Ergonomic design principles Part 1: Terminology and general principles EN 746-1:1997 Industrial Thermoprocessing Equipment Part 1: Common Safety Requirements for Industrial Thermoprocessing Equipment EN 746-2:1997 Industrial Thermoprocessing Equipment Part 2: Safety Requirements for Combustion and Fuel Handling Systems EN 746-3:1997 Industrial Thermoprocessing Equipment Part 3: Safety Requirements for the Generation and Use of Atmosphere Gases EN 746-5:2000 Industrial Thermoprocessing Equipment Part 5: Particular Safety Requirements for Salt Bath Thermoprocessing Equipment EN 746-8:2000 Industrial Thermoprocessing Equipment Part 8: Particular Safety Requirements for Quenching Equipment prEN 1005-2:1998 Safety of machinery - Human physical performance Part 2: Manual handling of machinery and component parts of machinery prEN 1005-3:1998 Safety of machinery - Human physical performance Part 3: Recommended force limits for machinery operation EN 1070 Safety of machinery - Terminology Page EN 746-8:2000 EN 60204-1:1997 Safety of machinery - Electrical equipment of machines Part 1: General requirements (IEC 60204-1:1997) EN 61310-1 Safety of machinery - Indication, marking and actuation Part 1: Requirements for visual, auditory and tacticle signals (IEC 61310-1:1995) DEFINITIONS For the purposes of this standard the definitions given in EN 1070 apply Additional definitions specifically needed for this standard are added below: 3.1 Enclosed Chamber A chamber used for quenching with a gas or gases at low atmospheric or positive pressures 3.2 Quenching Media The fluid used as the coolant to extract heat from the components being processed, such as oils, water/oil emulsions, salt solutions, molten lead, polymers, steam (water vapour) and fluidised beds 3.3 Flood Quench A quenching process where a liquid quenchant is pumped or flows by gravity over the surface of the part to be treated 3.4 Open Quench Components enter the quench medium in contact with the atmosphere contained in a fully open tank 3.5 Press Quench A quenching process carried out in specially designed machines in which the hot component is located between dies under pressure and held in position while the quenchant flows over it 3.6 Small Tank A container of less than 1000 l capacity and with a surface area (open or covered) of less than m2 3.7 Medium Tank A container of between 1000 l and 3000 l capacity and with a surface area (open or covered) of not more than m2 Page EN 746-8:2000 3.8 Large Tank A container of more than 3000 l capacity and a surface area (open or covered) of more than m2 3.9 Closed Tank A container in which the quenchant surface is covered or totally blanketed by a gas or gases that exclude air or where the empty space is evacuated LIST OF HAZARDS An assessment of the foreseeable risks arising from the use of the industrial thermoprocessing equipment has been carried out when this standard was elaborated The clause has been condensed into a table (see table 1) It summarises those areas which require consideration by the manufacturer For ease of reference the table indicates the need for safety features or instructions in columns The table shall only be used in conjunction with clauses and where further detail is given Table shows the Hazard, Hazardous Situation, Preventative Measures and the Verification Means (as pointed out in clause 6) identified for the equipment type described in this part to this standard Page EN 746-8:2000 Table 1: List of Hazards, Hazardous Situations and Preventative Measures Item 1.1 Hazard Hazardous situations MECHANICAL Crushing, Mechanical handling system:
lifts Shearing,
overhead hoists Entanglement
quench elevators
continuous quenching Preventative measures see EN 746-1 References EN 746-1:1997 Table 1; 2.2 Table 1; 2.3 Table 1; 2.4 Verification means*) and EN 746-8:2000 5.8.1 5.8.2 5.8.3 EQUIPMENT USING QUENCHING OIL 2.1 Thermal Ejection of hot material causing burns/scalds Design to minimise ejection EN 746-1:1997 5.11 and 2 Maintenance instructions Pumping facilities and Water ingress - foaming Vacuum degassing Indicate max permissible water content in oil Corrosion of bath, pipes, overflows Provision of instructions to check water content in the oil 2.2 Fire and explosion 1 and Ignition of batch contents inside or Use a quenching medium, outside batch whose flash point is above Oil/water explosion(s) the maximum working temperature of the tank (Temperature after quenching of the part) and 2 Design the tank so that the immersion of a part does not lead to the maximum authorized temperature being exceeded The manufacturer shall indicate to the user the maximum load characteristic (e.g weight, volume) Avoid use of direct aqueous cooling Prevent foaming *) see Note to clause for explanation of numbers 5.5 5.5.2 and (continued Page 22 EN 746-8:2000 b) The maximum quenchant level shall be monitored where possible by securely-fixed float switches or probe-operated gauges These shall be tamper-proof as far as possible and located away from risk of mechanical damage; c) Closed tanks, where these are an integral part of the furnace structure, shall be designed such that the highest level of quenchant is not less than 150 mm from the floor of the hot zone of the processing chamber; d) For all tanks, a free board space of at least 150 mm shall be allowed above the maximum quenchant level to prevent spillage and slopping 5.10.2 Minimum Quenchant Level The minimum allowable level of quenchant in a tank shall take into account the following features: (1) a) The ability to cover fully the largest load or component to be immersed; b) The heat input from the load for which the quenchant tank was designed; c) The effectiveness of agitation/circulation and cooling systems in removing heat; d) The location of offtakes for any external cooling or circulation systems; e) Ability to cover heating elements or immersed radiant tubes; f) The necessity to provide a seal for a flammable or toxic atmosphere gas The minimum quenchant level shall be monitored where possible by securely-fixed float switches or probe-operated gauges These should be tamper-proof as far as possible and located away from risk of mechanical damage 5.10.3 Effective Depth A number of factors reduce the usable depth of quench tanks, including the following: (1) a) Agitation/circulation systems; b) Debris and lost components; c) Mechanised extraction system; d) Heating elements or immersed radiant tubes; e) Immersed elevators; f) Sludge pans, grids or baffles Any loss of depth due to such factors should be taken into account when designing quench tanks Page 23 EN 746-8:2000 5.10.4 Agitation and Circulation a) Agitation systems shall be monitored, and should be operating before quenching commences except where 5.8.2 c) 2) applies; (1 and 2) b) Circulation systems shall be monitored This may include: (1) 1) The operation of pumps; 2) Measurement of quenchant flow, pressure, temperature etc., on the discharge side of any pump or weir; 3) Measurement of coolant flow, pressure, temperature, etc., on the discharge side of any pump or weir; c) Agitation and circulation systems shall be interlocked to give early warning of failure and prevent further quenching Typical faults include: 1) 2) 3) 4) Inadequate quenchant flow or pump failure; Inadequate cooling of circulated quenchant; Inadequate coolant flow or pump failure; Inadequate agitation or motor failure; d) The operation of interlocks shall be accompanied by the operation of audible and visual alarms 5.10.5 Contamination Suitable monitoring equipment is advisable to detect water contaminating the quenching oil Regular checks of this water content shall be carried out at intervals recommended by the manufacturer (1) 5.11 Plant/Equipment Details 5.11.1 Location of plant The manufacturer shall provide information for use as follows: The manufacturer or supplier may or may not have responsibility for the matters discussed in 5.11 to 5.13 Where responsibility is passed to another party the contents of these subclauses shall be provided as relevant information Oil quench tanks shall be located as far as practicable to meet the following criteria: (1) a) Away from hazardous or critical plant; b) Away from essential services; c) Away from essential processes; d) Away from essential storage facilities (both internal and external) Page 24 EN 746-8:2000 The following possible locations are listed in order of preference: a) In a detached, single-storey, purpose-designed structure; b) In a fire-segregated area, adjacent to an external wall and as far as practicable with external access for ease of fire fighting; c) On the ground floor of a non-combustible structure 5.11.2 Plant Layout a) Adequate spacing of furnaces, quench tanks and associated equipment from other plant is necessary; (1) b) There shall be adequate space around plant to provide easy access for emergency controls, fire fighting, as well as access for routine inspection and maintenance; (1) c) Control panels and associated equipment shall be carefully located to minimise the effects of a foreseeable fire or explosion, and reduce the risk of damage or involvement and allow operators or supervisors to perform emergency functions from a position of relative safety; (1) d) Heat treatment equipment shall be positioned away from essential or hazardous services; (1) e) Large tanks shall be purpose-designed and located externally in a well-segregated, compounded area Where they have to be located near important buildings or structures, suitable protection is required (1) 5.11.3 Services a) Services shall be located overhead, or where this is not practicable, in floor ducts or channels Electricity, gas, oil and compressed air supplied should be kept separate There shall be adequate provision in floor ducts or channels for inspection, maintenance and drainage; (1) b) Where floor ducts or channels are used, means for the identification of leakage or ingress, and gas detectors as appropriate Provision should also be made to allow for the draining of any leakage or external contamination to a safe point away from pits around tanks and furnaces, etc.; (1) c) Pipework and conduits shall be located to minimise the risk of impact damage (e.g., from trucks, work handling equipment, cranes, etc.) or involvement in fire; (1) d) Wherever possible, pipework and conduits shall not be located above the equipment It is particularly important to ensure that water supplies are not located over or adjacent to oil quenching tanks; (1) e) All essential services, whether in pipework or conduit, should be colour-coded according to appropriate standards and labelled clearly according to content and direction of flow; (1) Page 25 EN 746-8:2000 f) All essential services shall be provided with manually-operated isolation valves for emergency use only These should be strategically located away from hazardous plant, preferably outside the building or heat treatment area They shall be marked clearly and kept easily accessible (1 and 2) 5.11.3.1 Gas Supplies a) Wherever practicable, bulk storage tanks or manifolded cylinder banks supplying gas for fuel or furnace atmospheres shall be located outside the heat treatment area and external to any important building or structure; (1) b) Gas supplies shall be routed externally where possible, entering the building or heat treatment area as close as possible to the point(s) of use (1) 5.11.3.2 Oil Supplies a) Piped oil supplies, for both fuel and quenching purposes, shall be provided with a purpose-designed pump system Gravity-feed systems are not recommended due to the risk of uncontrolled release in the event of leakage or pipe damage; (1) b) Flanged joints in overhead pipework carrying oil through heat treatment areas should be protected by baffles to prevent leakage contaminating the working area and possibly coming into contact with hot surfaces or components and igniting (1) 5.11.3.3 Cooling Water Supplies Pipework to and from heat exchangers etc., containing cooling water shall be sited to prevent leakage or damage resulting in contamination of equipment or the creating of a hazardous situation (e.g leakage into oil tanks) Cooling water pipework shall be located to allow for immediate inspection and maintenance (1) 5.11.3.4 Compressed Air Supplies Compressed air supplies, particularly where these are essential for the operation of valves, furnace doors, work handling equipment etc., shall be purpose-designed to ensure, as far as practicable, the continuity of supply under foreseeable emergency conditions (1) 5.12 Fire Precautionary Arrangements (when provided) 5.12.1 Fire alarms and evacuation arrangements a) It is essential that the site or building fire and evacuation alarms for the heat treatment area are clearly audible above all normal background noise and that they are distinguishable from any process alarms to avoid confusion or misunderstanding; (1) b) Fire alarm initiation points should be provided at strategic positions within or adjacent to the heat treatment area and also by all approved exits; (1) c) It is essential that clear escape routes are provided from all working areas to a clearly defined main gangway from which the alternative exit routes are marked clearly; (1) Page 26 EN 746-8:2000 d) All exit routes shall be marked clearly with directional signs as necessary, and clear notices of an approved type and size provided over all doorways on the exit route (1) 5.12.2 Fume and Heat Venting a) Quenching operations, particularly those involving oil should, where practicable, be provided with a metal canopy or hood directly over the tank, plus any associated pit etc., leading to a non-combustible exhaust duct This shall be positioned away from other plant and services and should terminate at a safe external point It shall be protected, e.g., by a weather cowl, to prevent rain from entering the building and also to ensure that flames are not directed down onto the roof; (1 and 2) b) In order to prevent the spread of fume, flame and heat throughout the building, consideration should be given to the provision of automatically-opening vents located directly above quench tanks and possible other sections of the heat treatment plant Consideration should also be given to the provision of non-combustible roof curtains or aprons around the heat treatment area, attached to truss steelwork, to facilitate the early opening and effectiveness of these vents (1 and 2) 5.12.3 Portable Fire Appliances Because of the fire hazards inherent in heat treatment operations, especially with oil quenching, it is essential that an adequate number of hand and/or trolley type fire-fighting appliances shall be provided at strategic locations They should be placed adjacent to particular hazard area, or grouped at a central point ready for use (1) The following types of equipment are considered most suitable for quenching applications: a) Carbon dioxide extinguishers, either as self-contained units or fed from large fixed cylinders via a reel of flexible high-pressure hose and a manually-controlled discharge horn These appliances are particularly suitable where live electrical equipment may be involved or nearby Due account of the safety of personnel in the area shall be taken when this type of equipment is used; b) Dry powder extinguishers, can be used where live electrical equipment may be involved or nearby; c) Foam extinguishers, which are particular suitable for oil fires; d) Fire blankets in quick release containers, can be used on clothing fires or for smothering small tanks and other equipment The following extinguishing methods are not recommended: a) Halogenated compounds, because of the risk of chemical breakdown into toxic and/or corrosive gases at the high temperatures involved; b) Low-pressure steam for oil tank fires, because of the possibility of discharging condensate into the hot oil Page 27 EN 746-8:2000 5.12.4 Fixed Fire Protection Systems 5.12.4.1 Plant Protection Systems Due account of the safety of personnel in the area shall be taken when this type of equipment is used It is always desirable, and in the case of large plant strongly recommended, that consideration is given to the provision of purpose-designed and engineered plant fire protection systems, especially where oil quenching is carried out Carbon dioxide, dry powder or foam shall be used as the extinguishing medium Nozzles shall be designed and positioned so as not to cause the ejection of hot or burning quenchant (1) Plant protection systems should be designed to be operated both manually and automatically, and, particularly in the case of carbon dioxide, consideration should be given to the provision of an adequate reserve supply to enable discharge to be repeated or maintained manually as circumstances dictate (1) 5.12.4.2 Ductwork Protection Systems It is important that extraction ducts are fitted with fixed fire protection systems, normally carbon dioxide, coupled with automatically-operating fire dampers, within the ducts themselves, interlocked with the initiation of the carbon dioxide Where adequate supplies of nitrogen are available from bulk installations, this could be piped into the ductwork as an extinguishing agent provided full saturation can be achieved (1) 5.13 Ergonomic Requirements Equipment control panels shall be in a good working position in accordance with EN 614-1 (1 and 2) In the case of the batch process, lifting equipment for charging or discharging shall be available for use (reference shall be made to prEN 1005-2:1998) (1 and 2) Reference shall also be made to prEN 1005-3:1998 (1) VERIFICATION OF SAFETY REQUIREMENTS AND/OR MEASURES Verification of the safety requirements and/or the preventative measures given in table and clause can be carried out by visual inspection, functional check or by a test to check a specific feature NOTE: The verification means have been annotated against the preventative measure in Table and also in italics against the preventative measure described in clause In most cases, verification by a test, when given, will be to a specific standard This is quoted, in italics against the specific preventative measure in clause to which it refers The code used to describe the verification means is as follows: = Visual Page 28 EN 746-8:2000 = Functional check = Test to check a specific feature INFORMATION FOR USE 7.1 General The manufacturer shall provide the user instructions which are full and comprehensive for installation, use, maintenance and dismantling of the equipment in accordance with the requirements of EN 746-1 and this standard The manufacturer shall remind the user that training of operators should include tuition in the safe handling of the plant/equipment and its operation The manufacturer shall remind the user that the equipment has been designed for use by trained operators or supervisors in accordance with the following points: 7.2 Specific Information To Be Provided 7.2.1 Warning plates and signs A statement that: a) At every entrance to the equipment warning signs, designed in accordance with EN 61310-1, covering the following warnings, shall be displayed where they are readable by all persons: 1) Prohibiting the extinguishing of fires with water; 2) Prohibiting the admittance of non-authorised persons NOTE: A non-authorised person is anyone other than the trained operator, persons under training, the supervisors or their superiors and trained maintenance/ service personnel or any other person identified by the user b) Place inside the equipment warning signs designed in accordance with EN 61310-1, covering the following warnings: Prohibiting, eating, drinking and smoking; c) Such signs shall be legible and permanent Page 29 EN 746-8:2000 7.2.2 Personal Protective Equipment (PPE) A statement that the following equipment shall be worn when working with quenching equipment: a) Face Protection e.g constructed of self-extinguishing material such as polycarbonate mounted on a suitable helmet in such a form that the face and skin are protected in accordance with EN 166 b) Protective suits e.g constructed of cotton with flame resistant chemical impregnation in accordance with EN 531 c) Shirts e.g constructed of cotton, they shall have long sleeves fastened by buttons or velcro in accordance with EN 531 d) Protective gauntlets e.g constructed of heat resistant material They shall be easily removable from the hands in accordance with EN 531 e) Protective shoes e.g constructed of leather with a friction/slip resistant sole in accordance with EN 345 and EN 346 A statement that Personal Protective Equipment shall be regularly cleaned 7.2.3 Emergency Items A statement that the following items shall be available in or near the quenching equipment locations: a) Fire fighting equipment, e.g protective clothing for firefighters in accordance with EN 469; b) Shower(s); c) Eye wash(es); d) Quenching antidotes 7.3 Marking of quench equipment Quench equipment shall be marked in accordance with the requirements of EN 746-1, with the following additions: a) Minimum, maximum and normal quenchant levels, and fill level if different; b) Airflow indication Page 30 EN 746-8:2000 7.4 User's information Users shall be provided with information about: a) Maximum component size; b) Specifications for quenchant and any other fluids or services; c) Instructions for initial (commissioning) plant testing, etc., leak testing, heater testing; d) Instructions for periodic inspection and maintenance of plant including draining fluid or water, checking interlocks, fire protection systems and mechanical handling equipment; e) Instructions for quenchant monitoring e.g., of flashpoint where necessary; f) Instruction for safe use including handling fluids etc.; g) Instructions on personal protective equipment; h) Information on layout, services and fire protection in 5.11 to 5.13, where applicable; i) Information on the possible consequences of plant modifications; j) Instructions on action to take in case of emergency 7.5 Care Care will always be required when dealing with oil tank fires using any portable fire appliance; there is always a risk of splashing burning oil outside the tank and spreading the fire 7.6 Maintenance of the equipment A statement that: a) The user is advised to carry out the checks detailed in table (or an alternative table) at the frequencies indicated and that records should be kept of these checks and retained for examination by regulatory authorities for a period of at least years; b) Ensure that there is a proper written maintenance schedule for the equipment Page 31 EN 746-8:2000 Table 2: Example of maintenance schedule that shall be provided by the manufacturer Item After installation and/or after any modification to the equipment At every start and then at regular intervals as specified by the manufacturer After every emptying Temperature Controllers A+B B B Safety Devices A+B B A+B Aux Equipment A+B - - Daily A; B as recommended A+B Loading Devices A+B A - A+B Exhaust Units A+B A - A+B Quench tank A+B A B A+B Key: A No visible defects B Effective and proper functioning At intervals specified by the manufacturer A+B Page 32 EN 746-8:2000 ANNEX A (INFORMATIVE) Examples of quenching equipment Key Cover Exhaust Agitator Heating element Figure A.1 Oil quenching tank Page 33 EN 746-8:2000 Key Loading und unloading Oil bath Vacuum chamber Figure A.2: Oil quenching vacuum chamber Page 34 EN 746-8:2000 2 Key Burner Exhaust Lock (gastight) Oscillating conveyor Idle pulley Figure A.3: Supporting rolls Conveyor belt Level control Quench bath Quench bath (oil or polymere) Page 35 EN 746-8:2000 ANNEX ZA (INFORMATIVE) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives 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 following EU Directives: Machinery Directive 98/37/EEC, WARNING: Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard Compliance with the clauses of this standard provides one means of conforming with the specific essential requirements of the Directive concerned and associated EFTA regulations BS EN 746-8:2000 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI Ð British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 020 8996 9000 Fax: 020 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: 020 8996 9001 Fax: 020 8996 7001 In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: 020 8996 7111 Fax: 020 8996 7048 Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: 020 8996 7002 Fax: 020 8996 7001 Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means ± electronic, photocopying, recording or otherwise ± without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtained from the Copyright Manager Tel: 020 8996 7070