BS-EN-13463-5-2003.pdf

BRITISH STANDARD BS EN 13463-5:2003 Non-electrical equipment intended for use in potentially explosive atmospheres Part 5: Protection by constructional safety “c” The European Standard EN 13463-5:2003 has the status of a British Standard ICS 13.230 ? BS EN 13463-5:2003 This British Standard, was published under the authority of the Standards Policy and Strategy Committee on 12 December 2003 © BSI 12 December 2003 ISBN 0 580 43093 6 National foreword This British Standard is the official English language version of EN 13463-5:2003. The UK participation in its preparation was entrusted to Technical Committee FSH/23, Fire precautions in industrial and chemical plant, which has the responsibility to: A list of organizations represented on this committee 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 Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 29 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 13463-5 December 2003 ICS 13.230 English version Non-electrical equipment intended for use in potentially explosive atmospheres - Part 5: Protection by constructional safety “c” Appareils non électriques destinés à être utilisés en atmosphères explosibles - Partie 5: Protection par sécurité de construction “c” Nicht-elektrische Geräte für den Einsatz in explosionsgefährdeten Bereichen - Teil 5: Schutz durch Konstruktive Sicherheit “c” This European Standard was approved by CEN on 1 September 2003. 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 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 Management Centre 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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13463-5:2003 E EN 13463-5:2003 (E) 2 Contents page Foreword3 1Scope 4 2Normative references 5 3Terms and definitions5 4General5 5Requirements for moving parts7 6Requirements for bearings.8 7Requirements for power transmission systems.9 8Requirements for clutches and couplings11 9Requirements for brakes and braking systems11 10Requirements for springs and absorbing elements.12 11Requirements for conveyor belts.12 12Marking .13 Annex A (informative) Examples of some of the thought processes and principles used in the construction of items of equipment protected by 'Constructional Safety' protection.14 Annex B (normative) Test requirements.21 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives23 Bibliography29 EN 13463-5:2003 (E) 3 Foreword This document EN 13463-5:2003 has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres - Explosion prevention and protection”, 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 June 2004, and conflicting national standards shall be withdrawn at the latest by June 2004. 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 Annex ZA, which is an integral part of this document. Annex A is informative. Annex B is normative. This document includes a Bibliography. 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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. EN 13463-5:2003 (E) 4 Introduction Non-electrical equipment has been used for over 150 years in industries having potentially explosive atmospheres and a great deal of experience has been gained in the application of protective measures to reduce the risk of ignition to an acceptably safe level. With the introduction of the ATEX Directive 94/9/EC and the inclusion of non-electrical equipment in its scope, it became necessary to produce ignition protection concept standards which clearly defined these protective measures and incorporated the extensive and diverse experience gained over the years. One of the methods of applying ignition protection, had been to select types of equipment not containing an ignition source in normal service and then apply good engineering principles, so that risk of mechanical failures likely to create incendive temperatures or sparks, was reduced to a very low level. Such protective measures are referred to in this standard as ignition protection by 'Constructional Safety', or type of protection 'c'. The purpose of this standard, is therefore to specify the requirements for equipment, protected by the type of protection 'c' which meets the essential safety and health requirements described in Directive 94/9/EC. 1 Scope 1.1This European standard specifies the requirements for the design and construction of non-electrical equipment, intended for use in potentially explosive atmospheres, protected by the type of protection Constructional Safety “c“. 1.2This standard supplements the requirements in EN 13463-1, the contents of which also apply in full to equipment constructed in accordance with this standard. 1.3Equipment complying with the relevant clauses of this standard meet the requirements for the following categories: Equipment Group I Category M2; Equipment Group II Category 2G or 2D; Equipment Group IICategory 1G or 1D; NOTEThe requirements for Group I, Category M1 equipment, are given in EN 50303 which specifies the requirements for both electrical and non-electrical equipment. 1.4The type of ignition protection described in the standard can be used either on it's own or in combination with other types of ignition protection to meet the requirements for equipment of Group I, categories M1 and M2 or Group II, categories 1 and 2 depending on the ignition hazard assessment in EN 13463-1. EN 13463-5:2003 (E) 5 2 Normative references This European Standard incorporates by dated or undated reference, 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 (including amendments). EN 982, Safety of machinery - Safety requirements for fluid power systems and their components Hydraulics. EN 983, Safety of machinery - Safety requirements for fluid power systems and their components Pneumatics. EN 1127-1:1997, Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and methodology. EN 1127-2:2002, Explosive atmospheres - Explosion prevention and protection Part 2: Basic concepts and methodology for mining. EN 13463-1:2001, Non-electrical equipment for potentially explosive atmospheres - Part 1: Basic method and requirements. prEN 13463-6, Non-electrical equipment for potentially explosive atmospheres Part 6: Protection by control of ignition source 'b'. EN 13463-8, Non-electrical equipment for potentially explosive atmospheres Part 8: Protection by liquid immersion 'k'. EN 13478, Safety of machinery - Fire prevention and protection EN 13501-1, Fire classification of construction products and building elements - Part 1: Classification using test data from reaction to fire tests EN 60529:1991, Degrees of protection provided by enclosures (IP Code), (IEC 60529:1989). 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 13463-1:2001, EN 1127-1:1997 and EN 1127-2:2002 and the following apply. 3.1 type of protection constructional safety “c“ type of ignition protection in which constructional measures are applied so as to protect against the possibility of ignition from hot surfaces, sparks and adiabatic compression generated by moving parts 3.2 mechanical sparks sparks, as well as showers of sparks, produced by impact or friction between two similar or dissimilar solid materials 4 General 4.1 Determination of suitability Before a decision is made to protect equipment or pieces of equipment for use as an assembly including interconnecting parts by the measures described in this standard, it shall have been subjected to the ignition hazard assessment in accordance with EN 13463-1. Furthermore, It shall also have been determined that, by enhancing or increasing the safety of certain vulnerable parts, the required level of protection is ensured against the possibility of ignition sources occurring. EN 13463-5:2003 (E) 6 4.2 Parts of equipment All parts and interconnecting parts of equipment shall be capable of functioning in conformity with the operational parameters established by the manufacturer throughout their foreseeable lifetime and be sufficiently firm and durable to withstand the mechanical and thermal stresses to which they will be subjected. 4.3 Ingress Protection 4.3.1 General The degree of ingress protection (IP) provided by the outer enclosures of equipment depends upon its intended duty and the type of environment it is designed to be used in. An appropriate rating, according to IP category 1, as specified in 13.4 of EN 60529:1991, shall be determined as part of the ignition hazard assessment (see 4.1) and shall be able to prevent foreign objects or water entering the equipment which could: i) reduce the ignition level to a lower value, by for example, allowing combustible dust, with a lower ignition temperature than the potentially explosive atmosphere, to form a layer on hot internal components or parts of the equipment; and/or ii) make contact with moving parts, resulting in the creation of a potential ignition source, unsafe malfunction or fire. The following subclauses, 4.3.3 to 4.3.5 below, specify the minimum degree of ingress protection (IP) for enclosures used in the circumstances described. 4.3.2In the case of equipment intended for use in gas/vapour atmospheres, where entry of foreign objects can cause ignition, but entry of dust is harmless, entry of falling objects shall be prevented. 4.3.3In the case of equipment intended for use in gas/vapour atmospheres, where the entry of dusts or liquids could cause malfunction leading to an ignition source, the enclosure shall be at least IP 54. 4.3.4In the case of equipment intended for use in potentially explosive dust atmospheres, where ingress of dust can result in an ignition source or fire, the enclosure shall be at least IP 6X. 4.3.5In the case of equipment intended for use in potentially explosive dust atmospheres, where ingress of dust and foreign objects are not likely to cause an ignition, no enclosure is necessary. NOTEAn enclosure can be required for other safety reasons, e.g. IP 2X to prevent parts of the body coming into contact with rotating parts. 4.4 Seals for moving parts 4.4.1 Unlubricated gaskets, seals, sleeves, bellows and diaphragms Unlubricated gaskets, seals, sleeves, bellows and diaphragms which are subject to rubbing contact in normal operation or during foreseeable malfunction, shall not contain light metals. Sleeves made of elastomeric material, PTFE or similar material, graphite and ceramics are suitable. Non-metallic materials shall be resistant to distortion and degradation without reducing the effectiveness of explosion protection (see EN 13463-1). 4.4.2 Stuffing box seals Stuffing-box seals shall only be used if a temperature rise above the maximum surface temperature can be excluded. NOTEA device to monitor temperatures and switch off equipment should be employed. 4.4.3 Lubricated seals Seals which normally require the presence of a replenishable lubricant to prevent hot surfaces occurring at their interface with equipment parts shall be designed to ensure the sufficient presence of lubricant or shall be protected by one of the following means: EN 13463-5:2003 (E) 7 - provision of an effective means to monitor the continued presence of the lubricant; or - provision of a temperature detection device to warn of increasing temperatures; or - design of the equipment to be capable of completing the dry run test, as described in annex B, without exceeding the maximum surface temperature of the equipment and/or suffering damage which would reduce the effectiveness of its ignition protection properties. NOTEMonitoring can be either continuous or by appropriate inspection and examination. The manufacturer's instructions shall include details relating to the correct lubrication, monitoring and maintenance of such seals. 4.5 Equipment lubricants/ Coolants/ Fluids 4.5.1Lubricants and/