1、STD.BSI BS EN 74b-8-ENGL 2000 m I1624669 0878902 96“ m BRITISH STANDARD Industrial thermoprocessing equipment - Part 8: Particular safety requirements for quenching equipment The European Standard EN 7464k2000 has the status of a British Standard ICs 25.180.10 IS EN 46-82000 NO COPYING WITHOUT BSI P
2、ERMISSION EXCEPT As PERMITTED BY COPYRIGHT LAW STD-BSI BS EN 746-8-ENGL 2000 W L62Ybb9 0878903 8Tb BS EN 746-8:ZOOO National foreword This British Standard is the official English language version of EN 746-8.2000. The TJK participation in its preparation was entrusted by Technical Committee MCEX?,
3、Safeguarding of machinery, to Subcommittee MCWS, Thennoprocessing equipment - Safety, which has the responsibfity to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related intemational and European developments and promulgate i
4、nterpretation, or proposals for change, and keep the UK interests informed; 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
5、in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necescary provisions of a contract
6、. 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 Cont cover, an inside front cover, the EN title page, pages 2 to 35 and a back cover. T
7、he BSI copyright notice dispiayed 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
8、Amendments issued since publication Amd*No* IDate I (=Omments O BSI 11-ZOO0 ISBN O 580 35980 8 STD.BS1 BS EN 746-ENGL 2000 W I1624669 0878904 732 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 746-8 September 2000 ICs 25.180.01 English version Industrial thermoprocessing equipment - Part 8: Pa
9、rticular safety requirements for quenching equipment Equipements thermiques industriels - Partie 8: Prescriptions particulires de scurit pour les quipements de trempe Industrielle Thermoprozeanlagen - Teil 8: Besondere Sicherheitsanforderungen an Abschreckanlagen This European Standard was approved
10、by CEN on 22 November 1999. CEN members are bound to comply with the CEWCENELEC 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 sta
11、ndards 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 t
12、o 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 Uni
13、ted Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMITE EUROPEEN DE NORMALISATION Central Secretariat: rue de Stassart, 36 9-1050 Brussels Q 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 746
14、-8:2000 E STD.BSI BS EN 746-8-ENGL 2000 I Lb24bb 0678705 677 m Page 2 EN 746-8:2000 Contents FOREWORD O INTRODUCTION 1 SCOPE 2 NORMATIVE REFERENCES 3 DEFINITIONS 3.1 Enclosed Chamber 3.2 Quenching Media 3.3 Flood Quench 3.4 Open Quench 3.5 Press Quench 3.6 Small Tank 3.7 Medium Tank 3.8 Large Tank 3
15、.9 Closed Tank 4 LIST OF HAZARDS 5 SAFETY REQUIREMENTS AND/OR 5.1 General 5.2 Layout EASURES Page 3 4 4 4 6 6 6 6 6 6 6 6 7 7 7 1 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.1 1 5.12 5.13 Design and Construction of Quench Tanks Exhaust and Ventilation Systems Cooling Systems (where provided) Tracing and Jack
16、eting Heating Systems Component Handling Controls and Alarms Quenchant Level and Effective Depth PlantEquipment Details Fire Precautionary Arrangements Ergonomic Requirements 6 VERIFICATION OF SAFETY REQUIREMENTS AND/OR MEASURES 7 INFORMATION FOR USE 7.1 General 7.2 7.3 Marking of quench equipment 7
17、.4 Users information 7.5 Care 7.6 Maintenance of the equipment Specific Information To Be Provided ANNEX A (INFORMATIVE) Examples of quenching equipment ANNEX ZA (INFORMATIVE) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives. 11 12 12 14 15 16
18、17 17 20 21 23 25 27 27 28 28 28 29 30 30 30 32 35 Page 3 EN 746-812000 FOREWORD This European Standard has been prepared by Technical Committee CENflC 186 “Industrial thermoprocessing - Safety“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national
19、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 201. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Fre
20、e 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 CENKENELEC Internal Regulations, the national standards organizations of the following countries
21、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 compri
22、sed 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:
23、 Part 2: Part 3: Part 4: Part 5: Part 6: Part 7: Part 8: Common Safety Requirements for Industrial Thermoprocessing Equipment Safety Requirements for Combustion and Fuel Handling Systems Safety Requirements for the Generation and Use of Atmosphere gases Particular Safety Requirements for Hot Dip Gal
24、vanising Thermoprocessing Equipment Particular Safety Requirements for Salt Bath Thermoprocessing Equipment Particular Safety Requirements for Material Melting, Remelting and Liquid Phase Maintaining Thennoprocessing Equipment Particular Safety Requirements for Vacuum Thermoprocessing Equipment. Par
25、ticular Safety Requirements for Quenching Equipment STD.BS1 BS EN 74b-8-ENGL 2000 m 3b24bb 0878907 441 m Page 4 EN 746-82000 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. O INTRODUCT
26、ION 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 Europea
27、n 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. 1 SCOPE This part of EN 746 gives the specific hazards and safety requirements that shall be provided by the manufacturer for Quenching Equipment, whether i
28、t 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, tr
29、ansfer 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 quenchi
30、ng equipment are shown in Fig, 1 and Fig. 2. NOTE: There are many variations in the design of quenching equipment. Only two examples of the various types are given in this text. 2 NORMATIVE REFERENCES This European Standard incorporates by dated or undated references, provisions from other publicati
31、ons. 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. F
32、or undated references the latest edition of the publication referred to applies. EN 166 Personal eye-protection - Specifications $TD.BSI BS EN 74b-8-ENGL 2000 Lb24bb9 0878908 388 Page 5 EN 746-8:2000 EN 292-1:1991 Safety of machinery - Basic concepts, general principles for design - Part 1 : Basic t
33、erminology, methodology EN 292-2: 199 1 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 Protect
34、ive 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 an
35、d 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 Industr
36、ial Thennoprocessing 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
37、 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 fo
38、r machinery operation EN 1070 Safety of machinery - Terminology EN 60204-1:1997 Safety of machinery - Electrical equipment of machines - Part 1 : General requirements (IEC 60204- 1 : 1997) EN 61310-1 3 Safety of machinery - Indication, marking and actuation - Part 1: Requirements for visual, auditor
39、y and tacticle signals (IEC 61 3 10-1 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
40、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
41、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 lo
42、cated between dies under pressure and held in position while the quenchant flows over it. 3.6 Small Tank A container of less than 1000 1 capacity and with a surface area (open or covered) of less than 1 m2. 3.7 Medium Tank A container of between 1000 1 and 3000 1 capacity and with a surface area (op
43、en or covered) of not more than 2 m2. 3.8 STD.BSI BS EN 7g6-8-ENGL 2000 m 1b2Libb9 0878910 T36 m - Page 7 EN 746-8:2000 Large Tank A container of more than 3000 1 capacity and a surface area (open or covered) of more than 2 m*. 3.9 Closed Tank A container in which the quenchant surface is covered or
44、 totally blanketed by a gas or gases that exclude air or where the empty space is evacuated. 4 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 condense
45、d 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 5 and 7 where further detail is given.
46、Table 1 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. sTD.BS1 BS EN 746-8-ENGL 2000 111 1624669 08789LJ, 972 111 Page 8 EN 746-8:2000 3 Hazardous situatio
47、ns Table 1: List of Hazards, Hazardous Situations and Preventative Measures 4 Preventative measures 1 Item Mechanical handling system: - lifts - overhead hoists - quench elevators - continuous quenching 1 1.1 - see EN 746- 1 2 2.1 - - 1.2 2 Hazard MECHANI Crushing, Shearing, Entangle- ment EQUIPMENT
48、 USING QUENCHING OIL rhermal Fire and :xplosion Ejection of hot material causing burns/scalds Water ingress - foaming Vacuum degassing Corrosion of bath, pipes, overflows gnition of batch contents inside or lutside batch 3iUwater explosion(s) 1 Design to minimise ejection 2 Maintenance instructions
49、3 Pumping facilities 4 Indicate max. permissible water content in oil 5 Provision of instructions to check water content in the oil Use a quenching medium, whose flash pokt is above the maximum working temperature of the tank (Temperature after quenching of the part) 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 5 References EN 746-1: 1997 Ta
