1、BRITISH STANDARD BS EN 764-7:2002 Incorporating corrigenda nos. 1 and 2 Pressure equipment Part 7: Safety systems for unfired pressure vessels The European Standard EN 764-7:2002 has the status of a British Standard ICS 23.020.30 BS EN 764-7:2002 This British Standard was published under the authori
2、ty of the Standards Policy and Strategy Committee on 13 June 2002 BSI 2007 ISBN 978 0 580 59989 7 National foreword This British Standard is the UK implementation of EN 764-7:2002, incorporating corrigenda September 2004 and June 2006. When the reference to this European Standard has been published
3、in the Official Journal of the European Communities (OJ), compliance with it will confer a presumption of conformity with the essential requirements covered by the standard in respect of the Pressure Equipment Directive (97/23/EC). The UK participation in its preparation was entrusted by Technical C
4、ommittee PVE/1, Pressure vessels, to Subcommittee PVE/1/19, Safety systems. A list of organizations represented on this subcommittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its cor
5、rect application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. Date Comments 15386 Corrigendum No. 1 4 October 2004 Change to Annex ZA 17327 Corrigendum No. 2 28 September 2007 Change to Clause 1 EUROPEAN STANDARD NORM
6、E EUROPENNE EUROPISCHE NORM EN 764-7 May 2002 ICS 23.020.30 Incorporating corrigenda September 2004 and June 2006 English version Pressure equipment - Part 7: Safety systems for unfired pressure equipment Equipements sous pression - Partie 7: Systmes de scurit ppour quipements sous pression non soum
7、is la flamme Druckgerte - Teil 7: Sicherheitseinrichtungen fr unbefeuerte Druckgerte This European Standard was approved by CEN on 29 April 2002. 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
8、 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
9、 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, Germ
10、any, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CEN
11、All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 764-7:2002 EEN 764-7:2002 (E) 2 Contents page Introduction .5 1 Scope6 2 Normative references7 3 Terms and definitions .7 4 Risk consideration.9 4.1 General9 4.2 Identification of hazards
12、 .11 4.3 Solutions.12 5 Limiting devices and systems12 5.1 General12 5.2 Design.13 6 Pressure limitation.14 6.1 General14 6.2 Safety valves, direct loaded and pilot operated .16 6.3 Bursting disc safety devices 17 6.4 Safety Valves damage to the environment; damage to property 3.3 monitoring system
13、system which periodically checks given parameters and draws attention to those which are outside normal operating limits but which are below the limiting values determined by the hazard analysis. Normal operating conditions of the process can be restored either directly by the system or by an operat
14、or 3.4 regulating system system which adjusts or controls a particular parameter to maintain operation within predetermined limits 3.5 independence ability to function as required without interference from or dependence upon other equipment 3.6 fail-safe characteristic whereby the failure of any saf
15、ety system or any energy source will leave the protected equipment in a safe condition 3.7 hazard potential source of harm ISO/IEC Guide 51:1999 NOTE 1 Harm is the physical injury or damage to the health of people or damage to property or to the environment. NOTE 2 The term hazard can be qualified i
16、n order to define its origin or the nature of the expected harm. 3.8 risk combination of the probability of occurrence of harm and the severity of that harm ISO/IEC Guide 51:1999 3.9 risk analysis use of available information to identify hazards and to estimate the risk ISO/IEC Guide 51:1999 3.10 ri
17、sk evaluation judgement, on the basis of risk analysis, of whether a tolerable risk has been achieved ISO/IEC Guide 51:1999 3.11 risk assessment overall process of risk analysis and risk evaluation ISO/IEC Guide 51:1999 EN 764-7:2002 (E) 9 3.12 reliability ability of a system or component to perform
18、 a required function under specified conditions and for a given period of time without failing 3.13 shutdown automatically or manually initiated action to achieve a safe condition of the pressure equipment 3.14 lockout system feature which preserves the shutdown action until it is released by a manu
19、al intervention 3.15 safety related measurement, control and regulation system (SRMCR) system which by means of automatic control equipment, operating independently from other process control functions, prevents operating parameters exceeding allowable limits in pressure equipment 3.16 limiter devic
20、e which either activates the means for correction or provides for shutdown or shutdown and lockout 3.17 safety freedom from unacceptable risk ISO/IEC Guide 51:1999 3.18 self-diagnosis regular and automatic determination that all chosen components of a safety system are capable of functioning as requ
21、ired 3.19 maximum allowable pressure (PS) maximum pressure for which the equipment is designed, as specified by the manufacturer 3.20 maximum/minimum allowable temperature (TS) maximum/minimum temperatures for which the equipment is designed, as specified by the manufacturer 3.21 redundancy provisio
22、n of more than one device or system which is sufficient to perform or provide the necessary function 3.22 controlled safety pressure relief systems (CSPRS) pressure relief system conforming to prEN ISO 4126-5 4 Risk consideration 4.1 General All service conditions shall be considered to select the most appropriate safety concept to ensure safe operation. This requires a realistic assessment of risk by means of risk analysis and risk evaluation (see Figure 2).
