1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 764-2:2012Pressure equipmentPart 2: Quantities, symbols and unitsBS EN 764-2:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 764-
2、2:2012. Itsupersedes BS EN 764-2:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PVE/1, Pressure Vessels.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include a
3、ll the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 71687 4ICS 01.060; 23.020.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This Br
4、itish Standard was published under the authority of theStandards Policy and Strategy Committee on 29 February 2012.Amendments issued since publicationDate Text affectedBS EN 764-2:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 764-2 January 2012 ICS 01.060; 23.020.30 Supersedes EN 764-2:20
5、02English Version Pressure equipment - Part 2: Quantities, symbols and units Equipements sous pression - Partie 2: Grandeurs, symboles et units Druckgerte - Teil 2: Gren, Symbole und Einheiten This European Standard was approved by CEN on 9 December 2011. CEN members are bound to comply with the CEN
6、/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 CEN-CENELEC Management Cen
7、tre 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 CEN-CENELEC Management Centre has the same status as th
8、e official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romani
9、a, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means res
10、erved worldwide for CEN national Members. Ref. No. EN 764-2:2012: EBS EN 764-2:2012EN 764-2:2012 (E) 2 Contents page Foreword 3g31g3 Scope 4g32g3 Normative references 4g33g3 General 4g34g3 Quantities, symbols and units 4g3BS EN 764-2:2012EN 764-2:2012 (E) 3 Foreword This document (EN 764-2:2012) has
11、 been prepared by Technical Committee CEN/TC 54 “Unfired pressure vessels”, the secretariat of which is held by BSI. 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 July 2012, and conflicting nati
12、onal standards shall be withdrawn at the latest by July 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes
13、 EN 764-2:2002. This European Standard consists of seven parts which are: Part 1 Terminology Pressure, temperature, volume and nominal size; Part 2 Quantities, symbols and units; Part 3 Definition of parties involved; Part 4 Establishment of technical delivery conditions for metallic materials; Part
14、 5 Compliance and Inspection Documentation of Materials; Part 6 Structure and content of operating instructions; Part 7 Safety systems for unfired pressure equipment. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to imple
15、ment this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swi
16、tzerland, Turkey and the United Kingdom. BS EN 764-2:2012EN 764-2:2012 (E) 4 1 Scope This European Standard specifies the basic quantities, symbols and units to be used for pressure equipment and assemblies addressed by the European Directive 97/23/EC. 2 Normative references The following referenced
17、 documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references the latest edition of the referenced document (including any amendments) applies. ISO 80000-1, Quantities and units Part 1: General ISO 80000-2, Quantities
18、and units Part 2: Mathematical signs and symbols to be used in the natural sciences and technology ISO 80000-3, Quantities and units Part 3: Space and time ISO 80000-4, Quantities and units Part 4: Mechanics ISO 80000-5, Quantities and units Part 5: Thermodynamics ISO 80000-11, Quantities and units
19、Part 11: Characteristic numbers 3 General 3.1 All units used for pressure equipment shall be derived from the base units of the international system of Units (SI) in accordance with ISO 80000-1, ISO 80000-2, ISO 80000-3, ISO 80000-4, ISO 80000-5, and ISO 80000-11 unless otherwise prescribed in the E
20、uropean Directive 97/23/EC. 3.2 The choice of the appropriate multiple (decimal multiple or sub-multiple) of unit is governed by convenience, the multiple chosen for a particular application being one which would lead to numerical values within a practical range. Therefore when indicating quantities
21、 it is recommended to choose decimal multiple or sub multiple quantities such that the resulting values are easy to handle, e.g. between 0,1 and 1 000. 4 Quantities, symbols and units Symbols and units for the quantities used in pressure equipment shall be in accordance with Tables 1 and 2, otherwis
22、e according to ISO 80000 series for other quantities and in particular ISO 80000-5 for thermodynamic quantities. BS EN 764-2:2012EN 764-2:2012 (E) 5 Table 1 General quantities Quantity Symbol Unit Time t s, min, h Frequency f Hz Dimension any Latin letter bmm Length l mm Thickness e a mm Corrosion a
23、llowance c mm Diameter d, D mm Radius r, R mm Area A, S mm2Volume, capacity V m3 c, dWeight W aN, kN Density kg/m3ePower kW, MW Second moment of area mm4Section modulus Z mm3Acceleration am/s2Plane angle any Greek letter brad, a Symbol differs from the one recommended in ISO 80000.b Symbols may use
24、any lower-case letter, except for those defined elsewhere in this table. cVolume may also be given in L, when required by Pressure Equipment Directive, or in mm3. dLitre “L“ is a non-SI unit which may be used with SI units and their multiples. eDensity may also be given in kg/dm3and kg/mm3.BS EN 764
25、-2:2012EN 764-2:2012 (E) 6 Table 2 Mechanical quantities Quantity bSymbol cUnit Force F N Moment M N.mm Pressure p, P abar d, MPa Temperature T aC Thermodynamic temperature T K Linear expansion coefficient 10-6m/(m*C) Normal stress MPa, N/mm2Shear stress MPa, N/mm2Nominal design stress f MPa, N/mm2T
26、ensile strength RmMPa, N/mm2Tensile strength at 20 C Rm/20MPa, N/mm2Yield strength ReMPa, N/mm2Yield strength at 20 C Re/20MPa, N/mm21,0 % proof strength Rp1,0MPa, N/mm2Proof strength at temperature T Rp/TMPa, N/mm2Upper yield strength ReHMPa, N/mm20,2 % proof strength Rp0,2MPa, N/mm20,2 % proof str
27、ength at temperature T Rp0,2/TMPa, N/mm2Ultimate tensile strength at temperature T Rm/TMPa, N/mm21 % plastic creep strain strength limit at temperature T and time t e, gRcp1/T/t gMPa, N/mm2Creep rupture strength at temperature T and time t eRcm/T/t gMPa, N/mm2Modulus of elasticity E MPa, N/mm2Shear
28、modulus G MPa, N/mm2Poissons ratio - Strain % Elongation after rupture/fracture A % Impact energy KV J Hardness HB h, HV f- Joint coefficient z - Safety factor S - BS EN 764-2:2012EN 764-2:2012 (E) 7 Table 2 (continued) a Symbol differs from the one recommended in ISO 80000.b Quantities without a te
29、mperature index normally refer to room temperature. cSome of these symbols, such as R, f, are not part of ISO 80000.d“bar“ is a non-SI unit which may be used with SI units and their multiples. The unit bar shall be used on nameplates, certificates, drawings, pressure gauges and instrumentation and i
30、s always used as a gauge pressure. This is in line with the requirements of the Pressure Equipment Directive 97/23/EC. 1 bar = 0,1 MPa. eMean value. fThe hardness symbol HV is to be followed by a number (e.g., HV10) indicating the force (in) kg used for testing. gDiffers from present usage in EN 134
31、45:2010, but the intention is to revise EN 13445:2010 accordingly. hThe hardness symbol HB is often followed by a letter (e.g., HBW) indicating the material in the indenter (W would stand for tungsten). NOTE The use of symbols for temperature may be different from the Pressure Equipment Directive 97
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