Contents. EN :2012 (E) Issue 4 ( ) Page

Transcription

1 Contents Page O.3 Design and checking of the branch connection O.3.1 Limit value for the load due to pressure only for straight pipes without opening O.3.2 Determination of the minimum thicknesses under loading due to pressure only O.3.3 Checking of the thicknesses selected for the combination of pressure loading and loadings due to external loads Annex P (informative) Bolted flange connections Application of EN P.1 Introduction P.2 Scope P.2.1 General P.2.2 Materials P.2.3 Loadings P.2.4 Assumptions P.3 Application of EN P.3.1 Calculations P.3.2 Gasket coefficients P.3.3 Tightening Annex Q (informative) Simplified pipe stress analysis Q.1 General Q.2 Simplified procedure Q.2.1 General Q.2.2 Specification of allowable spacing of supports Q.2.3 Check of elasticity Q.3 Explanatory notes for Table Q Q.4 Symbols Q.5 Indices fl Q.6 Explanatory notes to Q Q.6.1 Specification of allowable spacing of supports Q.7 Conversion of the allowable lengths Q.7.1 Other support conditions Q.7.2 Other parameters Q.8 Additional single loads Q.8.1 General Q.9 Explanatory note on Figure Q Q.9.1 General Q.9.2 Required pipe leg length L1, for f1 from the nomogram Q.9.3 Required pipe leg length L2, for f2 from the nomogram Annex Y (informative) History of EN Annex ZA (informative) Relationship between this European Standard and the essential requirements of EU Directive 97/23/EC Bibliography

2 Foreword This document (EN :2012) has been prepared by Technical Committee CEN/TC 267 Industrial piping and pipelines, the secretariat of which is held by AFNOR. 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of an identical text or by endorsement, at the latest by December 2012, and conflicting national standards shall be withdrawn at the latest by December Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.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 has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document. In this European Standard the Annexes A, C, F, G, I, K, L, M, P and Q are informative and the Annexes B, D, E, H, J, N and O are normative. This European Standard EN for metallic industrial piping consists of eight interdependent and not dissociable Parts which are: Part 1: General; Part 2: Materials; Part 3: Design and calculation; Part 4: Fabrication and installation; Part 5: Inspection and testing; Part 6: Additional requirements for buried piping; CEN/TR : Guidance on the use of conformity assessment procedures; Part 8: Additional requirements for aluminium and aluminium alloy piping. Although these Parts may be obtained separately, it should be recognised that the Parts are interdependent. As such the manufacture of metallic industrial piping requires the application of all the relevant Parts in order for the requirements of the Standard to be satisfactorily fulfilled. This European Standard will be maintained by a Maintenance MHD working group whose scope of working is limited to corrections and interpretations related to EN The contact to submit queries can be found at (en13480@unm.fr). A form for submitting questions can be downloaded from the link to the MHD website. After subject experts have agreed an answer, the answer will be communicated to the questioner. Corrected pages will be given specific issue number and issued by CEN according to CEN Rules. Interpretation sheets will be posted on the website of the MHD. 9

3 This document supersedes EN :2002+A1:2005+A2:2006+A3:2009+A4:2010+A5:2012. This new edition incorporates the Amendments/the corrigenda which have been approved previously by CEN members, the corrected pages up to Issue 17 without any further technical change. Annex Y provides details of significant technical changes between this European Standard and the previous edition. Amendments to this new edition may be issued from time to time and then used immediately as alternatives to rules contained herein. It is intended to deliver a new Issue of EN 13480:2012 each year, consolidating these Amendments and including other identified corrections. includes the corrected pages listed in Annex Y. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. 10

4 Because of the great length, the branching pipe L 4, L 5 does not represent any notable hindrance to expansion for f 2. Q Required pipe leg length for f 3 from the nomogram Join the intersection point of ladder A to ladder f (f 3 ), ladder L gives a required pipe leg length of L requ. = 5,7 m L* avail. = L6 L = 5,7 m = L requ. The explanatory notes on f 1 are applicable here for uncoupling the branching pipe. Q Required pipe leg length for f 4 from the nomogram Join the intersection point of ladder A to ladder f (f 4 ), ladder L gives a required pipe leg length of L requ. = 4,8 m L avail. = L 5 = 5 m > L requ. Q Required pipe leg length for f 5 from the nomogram Join the intersection point of ladder A to ladder f (f 5 ), ladder L gives a required pipe leg length of L requ. = 4,8 m L avail. = L 4 = 5 m > L requ. 405

5 Annex Y (informative) History of EN Y.1 Differences between EN :2002 and EN :2012 The 2012 edition of EN contains the 2002 edition of the standard and all Amendment(s) and correction(s) issued in the meantime. Significant technical changes include: Addition in clause 2 of normative references related to the types of inspection documents for metallic products and qualification of welding procedures for metallic materials. Revision of concerning the design conditions related to the time-dependent nominal design stress, of 6.6 related to the bolted flange connections, of clause 8 related to openings and branch connections, of clause 11 related to integral attachments and of clause 13 related to supports. Revision of the Annex B related to more accurate calculation of bends and elbows. Revision of the Annex H related to the flexibility characteristics, flexibility and stress intensification factors and section moduli of piping components and geometrical discontinuities. Revision of the Annex L related to the buckling of linear type supports. Revision of the Annex N related to the documentation of supports. Addition of the new Annex O related to the alternative method for checking branch connections. Addition of the new Annex P related to the bolted flange connections (application of the European Standard concerning the calculation method for the design rules for gasketed circular flange connections). Addition of the new Annex Q related to the simplified pipe stress analysis. Revision of the Annexe ZA in relation with the Pressure Equipment Directive 97/23/EC. NOTE The changes referred include the significant technical changes but is not an exhaustive list of all modifications. Y.2 List of corrected pages of Issue 2 ( ) Pages 9, 10, 246 and 406. Y.3 List of corrected pages of Issue 3 ( ) Pages 10, 140, 263, 406 and 407. Y.4 List of corrected pages of Pages 8, 10, 406, 407 and

6 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU aimed to be covered This European Standard has been prepared under a Commission s standardization request M/071 "Mandate to CEN for standardization in the field of Pressure equipment" to provide one voluntary means of conforming to Essential Requirements of the New Approach Pressure Equipment Directive 2014/68/EU. Once this standard is cited in the Official Journal of the European Union under that Directive, compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations. Table ZA.1 Correspondence between this European Standard and Directive 2014/68/EU on Pressure Equipment Essential Safety Requirements (ERs) of Directive 2014/68/EU on Pressure Equipment, Annex I Clause(s)/subclause(s) of this EN Qualifying remarks/notes st paragraph 4.2 Proper design using relevant factors nd paragraph Clause 5 Safety coefficients and margins to Clause 4 Design for adequate strength st paragraph 4.2 Factors to be taken into account nd paragraph 4.2.2, Simultaneous occurrence of loading Clauses 6, 7, 8, 9, 11 and Annexes B, D, E, H and O Calculation method b) 1 st indent Calculation pressure b) 2 nd indent Calculation temperature and margins b) 3 rd indent Combinations of pressure and temperature b) 4 th indent Clause 5, 12.3 Maximum stresses and stress concentrations c) Clause 9, 12 Stability aspects Corrosion or other chemical attack Wear 6 a) 12.2 Risk of overstressing 7.1 Clause 5, 12.3, 13.3 Allowable stresses st indent Ferritic steels nd indent Austenitic steels rd indent Non-alloy or low alloy cast steel Joint coefficients WARNING 1 Presumption of conformity stays valid only as long as a reference to this European Standard is maintained in the list published in the Official Journal of the European Union. Users of this standard should consult frequently the latest list published in the Official Journal of the European Union. WARNING 2 Other Union legislation may be applicable to the product(s) falling within the scope of this standard. 407

7 Bibliography Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment. EN 764-2, Pressure equipment Terminology Part 2: Quantities, symbols and units EN 1514 series, Flanges and their joints Dimensions of gaskets for PN-designated flanges EN series, Flanges and their joints Dimensions of gaskets for Class-designated flanges EN , Water tube boilers Part 3: Design and calculation for pressure parts EN 13555, Flanges and their joints Gasket parameters and test procedures relevant to the design rules for gasketed circular flange connections EN 14917, Metal bellows expansion joints for pressure applications ISO 15348, Pipework Metal bellows expansion joints General BS 903: Part A26, Physical testing of rubber Method for determination of hardness (hardness between 10 IRHD and 100 IRHD) BS , Steel boiler and superheater tubes Part 2: Specification for carbon, alloy and austenitic stainless steel tubes with specified elevated temperature properties PD 5500, Specification for unfired fusion welded pressure vessels [1] Schwaigerer S: Festigkeitsberechnung von Bauteilen des Dampfkessel-, Behälter- und Rohrleitungsbaus; 2nd revised edition, Springer, Berlin/Heidelberg/New York (1970). [2] Makkinjad N: Berechnung des Rohrbogens unter Innendruckbeanspruchung VGB Kraftwerkstechnik (1989) No 9. pp [3] Welding Research Council Bulletin 107, revised version. [4] Welding Research Council Bulletin 297, revised version. [5] FDBR-Handbuch Methoden der Festigkeitsberechnung. [6] PG Hodge, Yield condition for rotationally symmetric stells under axisymmetric loading (1960), Trans. ASME. J. Appl. Mech. Series E, vol 82, n 2. [7] EC Rodebaugh, RL Cloud, Assessment of the plastic strength of pressure vessel nozzle (1968), Journal of Engineering for Industry. [8] WS Cottam, SS Gill, Experimental investigation of the behaviour beyond the elastic limit of flush nozzles in cylindrical pressure vessels (1966), Journal Mech. Eng. Sciences, 8, n 3, [9] K Delare, SS Gill, Effect of vessel diameter/thickness ratio on the behaviour beyond the elastic limit on flush nozzles in cylindrical pressure vessel experimental investigation (1966), J. Mech. Eng. Sciences. 408

8 [10] J Schroeder, Upper bonds to limit pressures of branch pipe lateral connections Part II: Bounds and reliability for branch pipe diameter ratios larger than 0,7, ASME, paper n 71 PVP 44. [11] F Ellyin, N Turkkan, Limit pressure of nozzles in cylindrical shells (1972), ASME, paper n WA PVP 1. [12] F Ellyin, An experimental study of elasto-plastic response of branch-pipe tee connections subjected internal pressure-external couples and combined loadings (1977), WRC, n 230. [13] Code 1969 de Construction des Appareils non soumis à l'action de la Flamme, règles de calcul. [14] A Turbat, Etude des problèmes d'ouverture et intersection dans les coques (1977), Rapport CETIM n A600. [15] Rapport CETIM n 14B091, A Handtschoewercker (1986). [16] JF Maurel, Dimensionnement des jonctions de tuyauteries en Té, Rapports CETIM NTI 02/95, 01/96, 50/96, 63/97, 55/98, 38/99. [17] HB Bickell, C Ruiz, Pressure Vessel Design and Analysis, Macmillan (1967). [18] DG Moffat, Experimental stress analysis of four fabricated equal diameter branch pipe connections subjected to moment loadings and the implications on branch junction design (1985), Proc.I.Mech.E. Vol.119 n A4. [19] DG Moffat, J Mistry, Interaction of external moment loads and internal pressure on a variety of branch pipe intersections (1988), Proc. 6 th Int. Conf. Pressure Vessel technology Beijing Pergamon. [20] Stahl im Hochbau (Steel in Building Construction), 14 th edition, Vol. 1/Part 2, No , p. 154, system 13. [21] AD2000 Merkblatt HP100R, June 2001 edition. 409