1、BRITISH STANDARD BS EN 12516-3:2002 Incorporating Corrigendum No. 1 Valves Shell design strength Part 3: Experimental method The European Standard EN 12516-3:2002 has the status of a British Standard ICS 23.060.01 BS EN 12516-3:2002 This British Standard, having been prepared under the direction of
2、the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 28 October 2002 BSI 18 November 2003 ISBN 0 580 40649 0 National foreword This British Standard is the official English language version of EN 12516-3:2002, inclu
3、ding Corrigendum September 2003. The UK participation in its preparation was entrusted by Technical Committee PSE/7, Industrial valves, to Subcommittee PSE/7/1, Basic standards, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to it
4、s 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
5、 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 unders
6、tand 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
7、 a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover 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. Date Comments 14810 Corrigendum No. 1 18 Novembe
8、r 2003 Correction to the Annex ZA page EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12516-3 October 2002 ICS 23.060.01 Incorporating corrigendum September 2003 English version Valves - Shell design strength - Part 3: Experimental method Appareils de robinetterie - Rsistance mcanique des enve
9、loppes - Partie 3: Mthode exprimentale Armaturen - Gehusefestigkeit - Teil 3: Experimentelles Verfahren This European Standard was approved by CEN on 1 August 2002. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stand
10、ard 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, Ge
11、rman). 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, Fi
12、nland, France, Germany, 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
13、 Brussels 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12516-3:2002 EEN 12516-3:2002 (E) 2 Contents page Foreword3 1 Scope4 2 Normative references4 3 Terms and definitions .4 4 Symbols4 5 Description of test .6 6 Test metho
14、d6 6.1 Safety aspects6 6.2 Wall thickness6 6.3 Material strength6 6.4 Experimental test pressure.7 6.5 Test fluid.8 6.6 Test duration8 6.7 Documentation.8 7 Acceptance criteria8 Annex A (informative) Information on the origin of the experimental test factor, C 9 Annex ZA (informative) Relationship b
15、etween this European Standard and the Essential Requirements of EU Directive 97/23/EC .11 Bibliography 12 EN 12516-3:2002 (E) 3 Foreword This document (EN 12516-3:2002) has been prepared by Technical Committee CEN /TC 69, “Industrial Valves“, the secretariat of which is held by AFNOR. This European
16、Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2003, and conflicting national standards shall be withdrawn at the latest by April 2003. EN 12516 consists of three parts : Part 1 : Tabulation method for s
17、teel valve shells ; Part 2 : Calculation method for steel valve shells ; Part 3 : Experimental method. 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 relation
18、ship with EU Directive(s), see informative annex ZA, which is an integral part of this document. Annex A is informative According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
19、Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. EN 12516-3:2002 (E) 4 Introduction This standard establishes an experimental method of assessing the strength of va
20、lve shells by applying an elevated hydrostatic pressure test at room temperature. The experimental test factor, C, for use in the equation to determine the elevated hydrostatic test pressure, takes into account the ductility of the various materials. Information on the origin of the experimental tes
21、t factor, C, is given in annex A. This standard may be used as an alternative method to those to be specified in Part 1 (Tabulation method) or Part 2, (Calculation method) within the limits specified in the scope. 1 Scope This standard specifies requirements for an experimental method to prove that
22、representative samples of valve shells and their body ends, made in cast iron, steel or copper alloy materials, are designed to possess the required pressure containing capability, with an adequate margin of safety. This standard is not applicable to valves designed on the basis of time dependent st
23、rength values (creep) or valves designed for pulsating pressure applications (fatigue). NOTE For valves needing to comply with the EU Directive 97/23/EC (PED), the upper limit for application of this standard without calculation, is when the maximum allowable pressure at room temperature, PS RT , mu
24、ltiplied by the DN-number is less than 3000 bar. This standard may be used to supplement the Tabulation method for steel valves, Part 1, and the Calculation method for steel valves, Part 2 without limit. 2 Normative references This European Standard incorporates by dated or undated reference, provis
25、ions 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
26、 amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 736-2, Valves Terminology Part 2 : Definition of components of valves. EN 736-3, Valves Terminology Part 3 : Definition of terms. 3 Terms and definitions For the purpos
27、es of this standard, the terms and definitions given in EN 736-2 and EN 736-3 apply. In this standard, the term component shall be taken to mean the body, the bonnet and the cover. 4 Symbols The following symbols are used in this standard : A is the percentage elongation after fracture, in per cent
28、; C is the experimental test factor ; C bis the experimental test factor for the body ; C bcis the experimental test factor for the bonnet or cover ; e mesis the measured wall thickness, in millimetres ; EN 12516-3:2002 (E) 5 e minis the minimum specified drawing wall thickness, in millimetres ; K i
29、s the factor for calculating of the experimental test pressure p t, exp; K bis the K for the body ; K bcis the K for the bonnet or cover ; p is the design pressure, in bar ; PS is the maximum allowable pressure, in bar ; PS RTis the maximum allowable pressure at room temperature, in bar ; PS tis the
30、 maximum allowable pressure at temperature t, in bar ; p t, expis the experimental test pressure, in bar ; p t, exp/RTis the experimental test pressure at room temperature, in bar ; p t, exp b/RTis the experimental test pressure at room temperature for the body, in bar ; p t, exp bc/RT is the experi
31、mental test pressure at room temperature for the bonnet or cover, in bar ; p” is the elevated test pressure used for type testing of series-manufactured valves, in bar ; R m/RTis the tensile strength at room temperature, in Newtons per square millimetre ; R p1,0is the 1,0 % proof strength, in Newton
32、s per square millimetre ; R p0,2 act/RTis the actual 0,2 % proof strength at room temperature, in Newtons per square millimetre ; R p0,2 min/RTis the minimum 0,2 % proof strength at room temperature specified in the appropriate material standard, in Newtons per square millimetre ; R p0,2 min/t is th
33、e minimum 0,2 % proof strength at temperature t specified in the appropriate material standard, in Newtons per square millimetre ; S is the safety factor ; S“ is the safety factor depending on the material ; X is the ratio of e mes to e min; X b maxis the maximum value of X for the body ; X bc maxis
34、 the maximum value of X for the bonnet or cover ; Y is the ratio of R p0,2 act/RT /R p0,2 min/RT; Y b is the Y for the body ; Y bcis the Y for the bonnet or cover. NOTE The term maximum allowable pressure, PS, defined in EU Directive 97/23/EC (PED) is equivalent to the term allowable pressure, p s ,
35、 defined in EN 736-3. EN 12516-3:2002 (E) 6 5 Description of test The valve body ends shall be closed using suitable sealing components e.g. flanges, threaded plugs, welded caps etc. corresponding to the type of body ends. The test equipment shall be of such a design, that it does not subject the sh
36、ell to externally applied loads and does not apply any reinforcement to the components, which may affect the results of the tests. NOTE The test equipment can apply external loads sufficient to react to the forces resulting from the test pressure. The test pressure shall be applied to the shell asse
37、mbly or to the assembled valve. The components may be tested separately. 6 Test method 6.1 Safety aspects Safety aspects during testing are not covered by this standard. The users of this standard should analyse the hazard resulting from the pressure and take proper safety precautions. 6.2 Wall thic
38、kness The shape and thickness of the metal of the component to be tested shall be in accordance with the minimum requirements as specified on the manufacturing drawing. No component shall be used for this test which has a measured thickness that exceeds the minimum thickness specified on the drawing
39、 by the greater of 2,5 mm (if the thickness is less than 10 mm) or 25 % of the specified minimum thickness. The thickness e mesof the component shall be measured at all locations where the thickness is specified on the drawing. In the case where a general thickness is specified on the drawing, witho
40、ut reference to a specific location, the actual thickness shall be checked at a minimum of three locations. These locations shall be chosen at positions, which adequately reflect possible wall thickness variations due to the manufacturing process and possible failure zones. Wall thicknesses measured
41、 in areas smaller than DN 10 mm 2shall not be taken into account when calculating the values of X. NOTE This restriction prevents the use of X values which are not representative of the general wall thickness. The measured wall thickness e messhall be divided by the minimum specified drawing wall th
42、ickness e minto find the values of X from the equation : min mes e e = X (1) The largest value for each component, X b maxand X bc maxshall be selected for the purpose of determining the value of K according to equations (3) and (4). 6.3 Material strength The material test certificates for each comp
43、onent shall be checked to ensure that the components to be tested are in accordance with the requirements of the material specification. EN 12516-3:2002 (E) 7 Using the actual proof strength, R p0,2 act/RTfrom the material test certificates for each component the ratio Y of actual proof strength, R
44、p0,2 act/RTdivided by the minimum proof strength, R p0,2 min/RTspecified in the appropriate material standard shall be calculated for each component. min/RT p0,2 act/RT p0,2 R R Y = (2) For materials where other mechanical properties are specified e.g. R m/RTfor grey iron, R p1,0for austenitic steel
45、s, these properties shall be used. 6.4 Experimental test pressure Using the experimental test factor, C, specified in Table 1 for the material used, values for K band K bcshall be calculated from the equations : K b = C b X b max Y b (3) K bc = C bc X bc max Y bc (4) The experimental test pressure p
46、 t, expshall be calculated from the equations : for the body, p t, exp b/RT= K b PS RT (5) for the bonnet/cover, p t, exp bc/RT= K bc PS RT(6) The lower of the two experimental test pressures calculated in equations (5) or (6) shall be applied. After testing at this pressure for the minimum test dur
47、ation (see 6.6), the pressure shall be increased to the higher pressure calculated in equations (5) and (6). The higher pressure shall be applied for the minimum test duration. As an alternative to testing at both pressures, the test may be conducted using the higher pressure only applied for the mi
48、nimum duration. When a component has already been shown, according to any part of EN 12516, to have the required pressure containing capability, at an allowable pressure at least equal to that of the shell to be tested, then the experimental test pressure calculated for this component shall not be a
49、pplied. If the allowable pressure PS is given only for an elevated temperature t, then the experimental test pressure p t, expshall be calculated from the following equations : for the body, min/t p0,2 min/RT p0,2 b b/RT exp t, t PS R R K p = (7) for the bonnet/cover, min/t p0,2 min/RT p0,2 bc bc/RT exp t, t PS R R K p = (8) EN 12516-3:2002 (E) 8 Table 1 Values for the experimental test factor C Material C Grey cast iron 3,5 Spheroidal 3 % A 7 % 2,5 Graphite 7
