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1、BRITISH STANDARD BS EN 764:1995 Pressure equipment Terminology and symbols Pressure, temperature, volume The European Standard EN 764:1994 has the status of a British Standard UDC 621.642-98:66.0:532.11:536.5:531.731:001.4 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 200
2、6, Uncontrolled Copy, (c) BSI BS EN 764:1995 This British Standard, having been prepared under the direction of the Engineering Sector Board (E/-), was published under the authority of the Standards Board and comes into effect on 15 January 1995 BSI 07-1999 The following BSI references relate to the
3、 work on this standard: Committee reference PVE/1 Draft for comment 92/77556 DC ISBN 0 580 23142 9 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following
4、countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandTech
5、nological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsoci
6、acin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37
7、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 764:1995 BSI 07-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 7643 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-referenceInsid
8、e back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 764:1995 ii BSI 07-1999 National foreword This British Standard has been prepared by Technical Committee PVE/1, Pressure vessels, and is the English language version of EN 76
9、4:1994 Pressure equipment Terminology and symbols Pressure, temperature, volume, published by the European Committee for Standardization (CEN). EN 764 was produced as a result of international discussions in which the United Kingdom took an active part. A British Standard does not purport to include
10、 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, pages i
11、and ii, the EN title page, pages 2 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov
12、07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 764 July 1994 UDC 621.642-98:66.0:532.11:536.5:531.731:001.4 Descriptors: Pressure equipment, pressure, temperature, volume, vocabulary English version Pressure equipment Terminology and symbo
13、ls Pressure, temperature, volume Equipement sous pression Terminologie et symboles Pression, temprature, volume Druckgerte Terminologie und Symbole Druck, Temperatur, Volumen This European Standard was approved by CEN on 1994-07-22. CEN members are bound to comply with the CEN/CENELEC Internal Regul
14、ations 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 Eu
15、ropean 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 na
16、tional standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr
17、Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 764:1994 E Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 764:1994 BSI 07-1999 2 Foreword According to the resolution BST
18、 2 44/1990, this European standard has been prepared by CEN/TC 54, Unfired pressure vessels, the secretariat of which is held by BSI. CEN/TC 54 has decided to submit the final draft for formal vote by its resolution 19/1992. The result was positive. The proposed definitions to not contain directives
19、 on how the values of these quantities are to be derived. Insofar as such derivation rules are needed, they belong in other (e.g. equipment specific) standards. Pressurized testing can take many forms: hydraulic or pneumatic test, strength test, controlled loading test, sealing test, proof test, bur
20、sting test etc., each with their own procedures, fluid, test pressure etc. The destinction and detailed descriptions and rules belong to the appropriate standards, and may entail definitions of terms. In the present general terminology standard, however, only the basic term “test pressure” has been
21、defined. The term “working” is no longer included in the term “allowable pressure” as this was open to misinterpretation. The present standard takes into account that the EC Council Draft Directive concerning pressure equipment reflects modifications with respect to document III/3561/90-EN rev. 5. T
22、his 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 January 1995, and conflicting national standards shall be withdrawn at the latest by June 1997. The date of withdrawal of conflicting national standa
23、rds may be modified by a decision of CEN to coincidate with the date of the end of the transition period of related EC Directives wherein the national provisions complying with the EC Directive come into force. According to the CEN/CENELEC Internal Regulations, the following countries are bound to i
24、mplement this European standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3General3 4Definitions and symbols3
25、Annex A (informative) Glossary5 Annex B (informative) Bibliography8 Annex C (informative) Relations between pressure quantities9 Figure C.1 Relations between pressure quantities9 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 764:1994 BS
26、I 07-19993 1 Scope This European Standard defines the basic terminology and symbols to be used for pressure equipment with regard to pressure, temperature and volume, except for simple pressure vessels in accordance with European Union directive 87/404/EEC and related standards. NOTE 1In addition to
27、 terms used in the three official CEN languages (English, French and German), this European standard gives in Annex A the equivalent terms in the Danish, Dutch, Finnish, Greek, Icelandic, Italian, Norwegian, Portuguese, Spanish, and Swedish languages; these are published under the responsibility of
28、the respective member bodies for those countries. However, only the terms and definitions given in the official languages can be considered as EN terms and definitions. NOTE 2This European standard does not stipulate the units to be used for the quantities defined. These shall be taken from the appl
29、ication standard. 2 Normative reference 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 amend
30、ments 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. ISO 31-0, Quantities and units General principles. 3 General 3.1 All fluid pres
31、sures referred to (except 4.4, 4.6 and 4.13) are relative to atmospheric pressure (i.e. they are gauge pressures). As a consequence, vacuum is designated by a negative value. 3.2 Symbols are given in the form required by ISO 31-0. Upper case letters may also be used. 3.3 Additional suffixes, such as
32、 min. or max., may be necessary. 4 Definitions and symbols The following definitions and symbols apply to pressure equipment: 4.1 pressure equipment equipment intended to maintain a pressure difference between distinct environments 4.2 compartment a single fluid space within a unit of pressure equip
33、ment 4.3 component a part of pressure equipment or assembly which can be considered as an individual item for the calculation 4.4 absolute pressure pressure for which the zero value is associated with absolute vacuum 4.5 gauge pressure pressure for which the value is equal to the algebraic differenc
34、e between the absolute pressure and atmospheric pressure thus defined, gauge pressure may be negative for a compartment “in partial vacuum” or “under vacuum” for example 4.6 differential pressure pressure for which the algebraic value is equal to the difference of pressure on both sides of a compone
35、nt NOTEThe gauge pressure is a particular case of the differential pressure. 4.7 operating pressure po the fluid pressure occurring during specified operating conditions 4.8 operating temperature to the fluid temperature occurring during specified operating conditions 4.9 allowable pressure ps a lim
36、it to the operating pressure normally at the top1) of each compartment of the pressure equipment, specified for safety reasons2),3) 4.10 allowable temperature ts a limit to the operating temperature, specified for safety reasons2),3) 1) This location is specified as a reference point to account for
37、the effects of static head of the contained fluid. There may be cases where another location needs to be specified. 2) The locations of limiting pressures and/or temperatures are not necessarily co-incident. 3) Depending on the operating conditions, one or more allowable pressure/temperature sets ma
38、y be specified, which may include sets for normal and exceptional conditions. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 764:1994 4 BSI 07-1999 4.11 design pressure pd the pressure at the top4) of each compartment of the pressure equ
39、ipment chosen for the derivation of the calculation pressure of each component5) 4.12 design temperature td the temperature chosen for the derivation of the calculation temperature of each component5) 4.13 calculation pressure pc6) the differential pressure used for the purpose of calculations of a
40、component.7) 4.14 calculation temperature tc the temperature used for the purpose of calculations of a component8) 4.15 test pressure pt the pressure to which the equipment is subjected for test purposes 4.16 test temperature tt the temperature at which the pressure test of the pressure equipment is
41、 carried out 4.17 accumulation the maximum amount by which the pressure may axceed the allowable pressure ps, while a safety device is operating 4.18 volume V the internal volume of a compartment, including the volume of nozzles to the first connection (flange, coupling, weld) and excluding the volu
42、me of internal structures (e.g. baffles, agitators) 4) This location is specified as a reference point to account for the effects of static head of the contained fluid. There may be cases where another location needs to be specified. 5) During the life of the pressure equipment the loadings are time
43、 dependent and determined by the combined effects of pressure, temperature and other factors. For complex equipment many such loadings may need consideration, governing loadings are not necessarily those which act at the same time and the same location. When cumulative damage may occur, e.g. in the
44、creep range, the choice of design conditions may be affected. 6) Depending on the component and the operating conditions the design process may be governed by one or more sets of calculation pressures/temperatures. 7) In formulas for calculations the suffixe “c” may be omitted. 8) Depending on the c
45、omponent and the operating conditions the design process may be governed by one or more sets of calculation pressures/temperatures. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 764:1994 BSI 07-19995 Annex A (informative) Glossary Licen
46、sed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 764:1994 6 BSI 07-1999 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 764:1994 BSI 07-19997 Licensed Copy: sheffieldun sheffieldun,
47、na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 764:1994 8 BSI 07-1999 Annex B (informative) Bibliography ISO 639, Code for the representation of names of languages. Council Directive of 25 June 1987 on the harmonization of the laws of the Member States relating to simple press
48、ure vessels (87/404/EEC). Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 764:1994 BSI 07-19999 Annex C (informative) Relations between pressure quantities (positive pressures)9) 9) For further information concerning safety systems, a sta
49、ndard is actually under preparation in CEN/TC 54/WG F. 2) Normally this margin is zero, i.e. ps = pd, but in some cases (e.g. in an assembly of several pieces of equipment with different values of pd) the value of ps may be less than pd for some pieces of equipment. Figure C.1 Relations between pressure quantities Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 10 blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 02:44:37 GMT+00:00 2006, Uncontrolled Copy, (c)
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