1、STD-BSI BS EN 12573-4-ENGL 2000 aEl lb24bb9 0882877 127 BRITISH STANDARD Welded static non-pressurized thermoplastic tanks - Part 4: Design and calculation of flanged joints The European Standard EN 125734.2000 has the status of a British Standard ICs 23.020.10 IS EN 2573-4:2000 NO COPYING WITHOUT B
2、SI PERMISSION EXCEPT AS PERMIITED BY COPYRIGHT LAW STDeBSI BS EN L2573-4-ENGL 2000 I Lb24bb9 0882898 Ob3 = BS EN 1257342000 been prepared under the direction of the Sector Amd. No. Date Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into
3、 effect on 15 November 2000 O BSI 11-2000 National foreword Comments This British Standard is the official English language version of EN 1257342000. The UK participation in its preparation was entrusted to Technical Committee PW62, Static thermoplastic tanks, which has the responsibility to: - aid
4、enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related intemational and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK A list of organizations represent
5、ed on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence
6、Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include 4 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
7、confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. ISBN O 580
8、34920 9 STD.BS1 BS EN L2573-4-ENGL 2000 Lb24669 0882899 TTT EUROPEAN STANDARD EN 125734 NORME EUROPENNE EUROPAISCHE NORM March 2000 ICs 23.020.10; 23.040.60 English version Welded static non-pressurized thermoplastic tanks - Part 4: Design and calculation of flanged joints Cuves statiques soudes en
9、matires thermoplastiques sans pression - Partie 4: Conception et calculs des joints brides Geschweite ortsfeste drucklose Behlter (Tanks) aus Thermoplasten - Teil 4: Konstruktion und Berechnung von Flanschverbindungen This European Standard was approved by CEN on 14 February 2000 CEN members are bou
10、nd to comply with the CENICENELEC 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 sich national standards may be obtained on application to the C
11、entral Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by traislation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status
12、as he official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMIITEE FOR STANDARDIZA
13、TION COMIT EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FUR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12573-4:2000 E STD-BSI BS EN 12573-4-ENGL 2000 162
14、4669 0882900 541 B Page 2 EN 12573-4:2000 Contents Page Foreword - 3 1 Scope - 3 2 Normative references 3 3 Symbols and abbreviations - . 4 4 Design requirements . 5 4.1 General . 5 4.2 Design principles *.-. 6 5 Calculation of the properties of bolts 7 5.1 General . 7 5.2 Calculation of the bolt fo
15、rces in the case of continuous gaskets 7 5.3 Calculation of the bolt forces in the case of O-ring gaskets 8 6 Calculation of the flange thickness . 9 6.1 General . 9 6.2 Fusion welded, moulded full face flanges and welded-on full face flanges with a continuous gasket or with an O-ring gasket . 10 6.
16、3 Fusion welded stub flanges and welded-on stub flanges with continuous gasket or with an O-ring gasket *- I1 7 Calculation of loose metal backing rings . 12 Annex A (normative) Material parameters for loose metal backing rings . 14 Annex B (informative) Adeviations .- 15 Bibliography -. 16 O BSI 11
17、-2000 STD-BSI BS EN 12573-4-ENGL 2000 111 Lb24bb9 0882901 488 Page 3 EN 12573-4:2000 Foreword This European Standard has been prepared by Technical Committee CENTTC 266, Thermoplastic static tanks, the Secretariat of which is held by BSI. This European Standard shall be given the status of a nationa
18、l standard, either by publication of an identical text or by endorsement, at the latest by September 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. EN 12573:2000 Welded static non-pressurized thermoplastic tanks“ consists of: Part 1 : General principles
19、Part 2: Calculation of vertical cylindrical tanks Part 3: Design and calculation of single skin rectangular tanks Part 4: Design and calculation of flanged joints The normative Annex A gives the values for the calculation of loose metal backing rings According to the CENICENELEC Internal Regulations
20、, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United
21、Kingdom. 1 Scope This part of this standard specifies the design and calculation of circular flanged joints, fabricated in the following thermoplastics: Polyethylene (PE) Polypropylene (PP) Poly (vinyl chloride) (PVC) Poly (vinylidene fluoride) (PVDF) 2 Normative references This European Standard in
22、corporates 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 amendments to or revisions of any of these publications apply to this E
23、uropean Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 12573-1 12000 Welded static non-pressurized thermoplastic tanks - Part I : General principles EN 1778 Characteristic values for welded thermopl
24、astic constructions - Determination of allowable stresses and moduli for design of thermoplastic equipment O BSI 11-2000 STD-BSI BS EN 12573-4-ENGL 2000 II 1624669 0882902 314 II Page 4 EN 12573-4:2000 3 Symbols and abbreviations For the purposes of this part of this standard the following symbols a
25、nd abbreviations apply: is the reduction factor to take account of the effect of specific strength, see EN 1778 is the reduction factor taking into account the effect of surrounding medium, see EN 1778 is the depth of the weld seam, in millimetres is the effective double flange width, in millimetres
26、 is the gasket width, in millimetres are welding process constants is the corrosion allowance, in millimetres is the gasket mean diameter, in millimetres is the bolt shank diameter, in millimetres is the bolt hole diameter, in millimetres is the reduced bolt hole diameter, in millimetres is the outs
27、ide diameter of flange, in millimetres is the inside diameter of cylindrical components, in millimetres is the pitch circle diameter, in millimetres is the inside diameter of loose backing ring, in millimetres is the mean contact diameter of a flange or stub flange, in millimetres is the d, + 2 x fl
28、ange edge radius, in millimetre, see Figure 15 is the depth of the weld undercut, in millimetres is the gasket thickness, in millimetres is the required thickness of a flange plate, in millimetres is the creep strength at the design temperature and lifetime, in newtons per square millimetre, see EN
29、1778 is the creep strength at a test condition (temperature and time), in newtons per square millimetre is the deformation resistance of gasket material, in newtons per square millimetre is the allowable yield stress of loose backing ring material (metal), in newtons per square millimetre is the all
30、owable yield stress of bolt material, in newtons per square millimetre is the characteristic value of a gasket in the assembled condition, in millimetres is the characteristic value of a gasket in the operating condition, in millimetres is the flange neck height, in millimetres is the lever arm of b
31、olt force, in millimetres is the number of bolts is the assembly force, in newtons is the surface pressure, in newtons per square millimetre is the bolt force in operating condition, in newtons is the bolt force at test pressure, in newtons is the bolt force in assembled condition prior to applicati
32、on of pressure, in newtons is the operating pressure above atmospheric, in bar is the test pressure, in bar is the safety factor, see part 1 is the safety factor for metals in operating condition is the safety factor for metals in test and assembled condition is the wall thickness of cylindrical com
33、ponent, in millimetres is the weakening coefficient are the moments of resistance of the flange, in cubic millimetres is the lever arm of the forces acting on the O-ring, in millimetres is the angle, in degrees O BSI 11-2000 STDOBSI BS EN 12573-4-ENGL ZOO0 E 1b24bb9 0882903 250 Page 5 EN 12573-4:200
34、0 4 Design requirements 4.1 General Various types of flanges are characterized their Figure I : Fusion weld, moulded full face flange shapes as shown in Figure 1 to 4: Figure 2: Fusion welded stub flange Figure 3: Welded-on full face flange Figure 4: Welded-on stub flange All these flange joints sha
35、ll be designed with a continuous gasket or O-ring, see Figures 5 to 1 O: Figure 5: Full face flanges with continuous gasket Figure 6: Full faceflanges with O-ring O BSI 11-2000 STD-BSI BS EN 12573-4-ENGL 2000 E 1b24bb9 0882904 197 Page 6 EN 12573-4:2000 Figure 7:Stub flanges with continuous gasket F
36、igure 8: Stub flanges with O-ring Figure 9: Full face flange and loose metal backing ring Figure IO: Full face flange and loose metal backing 4.2 Design principles The number of bolts shall be chosen as large as possible, so that a uniform seal can be ensured. The number of bolts shall be at least f
37、our. The bolt spacing in thermoplastic flanges shall not exceed 5 4 and shall not be greater than 80 mm. At low pressures the calculation can produce a flange thickness which is so small that the flanges can be deformed by the bolts forces. When positioned in the side wall of a tank below the liquid
38、 level, all flanges shall be reinforced with a loose backing ring (e.g. GRP or steel), see Figure 9 and IO. NOTE 1: For design examples see 2 of Bibliography. NOTE 2: When selecting the gasket material, the thermal and chemical resistance should be considered carefully. Gaskets of soft material are
39、preferred. O BSI 11-2000 STD.BSI BS EN 12573-Y-ENGL 2000 0 Lb24bb 0882705 023 = Page 7 EN 12573-4:2000 5 Calculation of the properties of bolts 5.1 General The inside diameter of the thread of the steel bolt shall be the largest value calculated from equation (1) or (2): a) for the operating conditi
40、on b) for the assembled condition where: 2 = 1,75 for steel bolts, with known allowable yield stress, where p I 1,3 p c=3mm External forces, e. g. due to thermal expansion, are not taken into account in equations (1) and (2). 5.2 Calculation of the bolt forces in the case of continuous gaskets 5.2.1
41、 Operating condition The bolt force in the operating condition shall be calculated according to equation (3). 5.2.2 Assembled condition The bolt force in assembled condition shall be calculated according to equation (4). Pso = PDV = n x dD x koX KD If Pco becomes greater than PsB, then Pso shall be
42、calculated according to equation (5). PSO = 0,2p, f 0,84PSB PDV The gasket parameters k, and k x C, = 2 For welded-on full face flanges: C = 1,l; C, = 3 O BSI 11-2000 STD.BS1 BS EN L2573-4-ENGL 2000 W Lb24bb7 0882909 773 m Page 11 EN 12573-4:2000 6.3 Fusion welded stub flanges and welded-on stub fla
43、nges with continuous gasket or with an O-ring gasket The lever am of the bolt force for operating and test condition, see Figures 15 and 16, shall be calculated according to equation (1 2). For the assembled condition the lever am of the bolt force is zero. Figure 15:Fusion welded stub flange (shown
44、 without gasket) 1.1 4 Figure 16:Welded-on stub flange (shown without gasket) The required height of the stub flange shall be calculated according to equation (13). - where W is the largest of W, or Wz. For fusion welded stub flanges: C = 0,9; G = 2 For welded-on stub flanges: C = 1 ,I ; CI = 3 The
45、surface pressure between loose backing ring and stub flange shall be calculated and assessed according to equations (14) and (15). 8 BSI 11-2000 STD-BSI BS EN 22573-4-ENGL 2000 E lb24bb7 0882910 490 I Page 12 EN 12573-4:2000 7 Calculation of loose metal backing rings The design of the flange, see Fi
46、gure 17, is determined by the greatest required flange resistance W, W, or W,. For the operating condition the flange resistance W, shall be calculated according to equation (16). PSBXSM KFI Wi = For the test condition the flange resistance W2 shall be calculated according to equation (17). PSB SM 1
47、 w2 = KFI (17) Figure 17: Loose metal backing ring For the assembled condition the flange resistance W, shall be calculated according to equation (I 8). PSOXSM 1 w3 = KFI If Pso is greater than Pse, the value for Pso shall to be substituted for Pse in equation (16). Equation (18) is then not require
48、d. The values for kI and Sy and SIM shall be taken from Annex A. The lever arm of the bolt force for the operating, test and assembled condition shall be calculated according to equation (19). dt - d2 n L O BSI 11-2000 STD=BSI BS EN 12573-4-ENGL 2000 M 3624bb9 0882911 327 M Page 13 EN 12573-4:2000 T
49、he required thickness of the flange plate shall be calculated according to equation (20). where W is the largest of W, W2 or W, and b =d, - dl - 2dL where dIL calculated according to equation (21). dL = V dL where v is determined from the graph given in Figure 18. di - Figure 18: Reduced bolt hole diameter Q BSI 11-2000 STD-BSI BS EN 12573-4-ENGL 2000 II 3624bb9 0882932 2b3 Material Rolled and forged steels Steel casting Nodular graphite iron Page 14 EN 1257342000 Shl SM KFI 2 295 OS 2 295 o02 2 2,5 00.1 Annex A (normative) Material parameters for loose metal ba
