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1、BRITISH STANDARD BS EN 764-7:2002 Incorporating Corrigendum No. 1 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 ? Copyright British Standards Institution Reproduced by IHS under license wi
2、th BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/04/2004 22:06:33 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- BS EN 764-7:2002 This British Standard, having been prepared under the direction of t
3、he Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 13 June 2002 BSI 4 October 2004 ISBN 0 580 39863 3 National foreword This British Standard is the official English language version of EN 764-7:2002, including Cor
4、rigendum September 2004. When the reference to this European Standard has been published 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 D
5、irective (97/23/EC). The UK participation in its preparation was entrusted by Technical Committee PVE/1, Pressure vessels, to Subcommittee PVE/1/19, Safety systems, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.
6、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
7、 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 t
8、ext; 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 c
9、over, an inside front cover, the EN title page, pages 2 to 39 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments 15386 Corrigendum No. 1 4 October 2004Change to Annex ZA Copyright
10、British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/04/2004 22:06:33 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EUROPEAN STANDARD NOR
11、ME EUROPENNE EUROPISCHE NORM EN 764-7 May 2002 ICS 23.020.30 Incorporating corrigendum September 2004 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 soumis la flamme
12、 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 national st
13、andard 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 l
14、anguage 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,
15、 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 All rights o
16、f exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 764-7:2002 E Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/04/2004 22:06:33 MST
17、Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EN 764-7:2002 (E) 2 Contents page Introduction.5 1 Scope 6 2 Normative references7 3 Terms and definitions .7 4 Risk consideration.9 4.1 General9 4.2 Identification of hazards .11 4.3 Solutions.12
18、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 system which period
19、ically 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 operator 3.4 regulating s
20、ystem 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 safety system or any e
21、nergy 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 in order to define i
22、ts 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 risk evaluation judge
23、ment, 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 Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Cop
24、y Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/04/2004 22:06:33 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EN 764-7:2002 (E) 9 3.12 reliability ability of a system or component to perform a required function under spe
25、cified 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 manual intervention 3.15 safety re
26、lated 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 device which either activates the m
27、eans 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 required 3.19 maximum allowable pr
28、essure (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 provision of more than one device or s
29、ystem 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
30、 to ensure safe operation. This requires a realistic assessment of risk by means of risk analysis and risk evaluation (see Figure 2). Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/0
31、4/2004 22:06:33 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EN 764-7:2002 (E) 10 Risk analysis involves: ? Determination of the boundaries of the pressure equipment including intended use and reasonably foreseeable misuse; ? Identificati
32、on of potential hazards and estimation of the risk. Risk evaluation involves the process in which, on the basis of risk analysis, judgement is made to achieve a tolerable risk. NOTE The manufacturer and the user should consider the most onerous conditions which can exist for pressure and temperature
33、 within the allowable limits. NOTE Risk reduction and the selection of safety systems are not part of risk analysis and risk assessment. Figure 2 Process for risk assessment and risk reduction Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Docume
34、nt provided by IHS Licensee=Bureau Veritas/5959906001, 11/04/2004 22:06:33 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EN 764-7:2002 (E) 11 4.2 Identification of hazards During operation of a piece of pressure equipment, dangerous situat
35、ions may occur due, for example to: ? operational aspects; ? human errors; ? unreliability of some functions; ? unsafe loading conditions; ? maintenance; ? physical characteristics of the fluid: a) pressure; b) temperature; c) flow; d) level; e) fouling capability; f) adhesion; g) abrasion; ? chemic
36、al characteristics of the fluid: a) corrosivity b) toxicity; c) flammability; d) stability; e) fouling; ? site conditions such as: a) vibration; b) temperature (e.g. freezing); c) wear; d) corrosion; e) external fire (see 7.2) Each of these factors can result in the operating limits of the pressure
37、equipment being exceeded. Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/04/2004 22:06:33 MST Questions or comments about this message: please call the Document Policy Group at 303-3
38、97-2295. -,-,- EN 764-7:2002 (E) 12 4.3 Solutions Risk assessment shall be used to produce the basic information which is needed to correctly design the pressure equipment and to select the most efficient safety accessories. The equipment shall be designed in order to: a) eliminate or reduce hazards
39、; b) provide appropriate protection measures if the hazard cannot be eliminated; c) inform the user of residual hazards and indicate the appropriate special measures for that case; d) prevent the danger from misuse. Preference shall be given to inherently safe design solutions. Operating instruction
40、s shall include instructions for inspection and maintenance to ensure that the required level of protection is available. NOTE Inspection and maintenance of safety systems are necessary to ensure that the required level of integrity is maintained. A record should be kept on both the procedures and f
41、indings 5 Limiting devices and systems 5.1 General Where the allowable limits can be exceeded, the pressure equipment shall be fitted with, or provisions shall be made for the fitting of: a) Regulating systems: Where appropriate, manually or automatically operated regulatory devices for the control
42、of operating parameters such as measurement, control and regulation devices (MCR), pressure switches, temperature switches, level switches and flow switches to maintain conditions during normal operation within the maximum / minimum allowable limits; b) Monitoring systems: Where appropriate, adequat
43、e monitoring devices for the control of operating parameters such as measurement, control and regulation devices (MCR), indicators, alarms, pressure switches, temperature switches, level switches, flow switches which enable adequate action to be taken either automatically or manually or activate the
44、 means for correction and/or provide for shutdown and lockout, to keep the pressure equipment within the allowable limits. If the process parameter value cannot exceed the allowable limits, a monitoring system is sufficient and a safety system unnecessary. The process parameter can be brought back i
45、nto the normal operating range by: ? manual action - after a status signal; or ? automatically; c) Safety systems: Safety devices such as safety valves, bursting disc safety devices, buckling rods, CSPRS, etc. or safety related measuring, control and regulation devices (SRMCR), which serve as ultima
46、te protection to ensure that the maximum allowable operating limits are not exceeded. Safety systems or their relevant components shall be independent of other functions, unless their safety function is not affected by such other functions. Copyright British Standards Institution Reproduced by IHS u
47、nder license with BSI - Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001, 11/04/2004 22:06:33 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295. -,-,- EN 764-7:2002 (E) 13 NOTE 1 See definition of independence. NOTE 2 Reg
48、ulating and monitoring systems which are not part of a safety systems are not covered by this standard. 5.2 Design 5.2.1 General The safety system shall be designed to operate sufficiently reliably under all conditions of operation determined by the risk analysis in 4.1, including start up, shut off, and during maintenance and repairs. All limiters, and their components, installed in a safety system shall comply