1、STD-BSI BS EN 12573-2-ENGL 2000 m Lb24bb7 0882840 247 M BRITISH STANDARD Welded static non-pressurized thermoplastic tanks - Part 2: Calculation of vertical cylindrical tanks The European Standard EN 12573-22000 has the status of a British Standard ICs 23.020.10 NO COPYING WITHOUT BSI PERMISSION EXC
2、EPT AS PERMITIED BY COPYRIGHT JAW 1s EN 12573-2:2000 STD-ES1 BS EN 12573-2-ENGL 2000 Lb24bbq 0882841 183 BS EN 12573-2:2000 been prepared under the direction of the Sector Conunittee for Materiais and Chemicals, was published under the authorim of the Standards Committee and comes into effect on 15
3、November 2000 Amd. No. O BSI 11-2000 ISBN O 580 34918 7 National foreword Date Comments This British Standard is the official English language version of EN 12573-2:2OOO. The UK participation in its preparation was entrusted to Technical Committee PRV62, Static thermoplastic tanks, which has the res
4、ponsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A list of
5、 organizations represented on this conunittee can be obtained on request to its secretay. 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 S
6、tandards Correspondence Index”, or by using the “Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Sta
7、ndard does not of itself 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 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was
8、 last issued. STD.BSI BS EN 12573-2-ENGL 2000 m Lb24bb 0882892 OLT EUROPEAN STANDARD NORME EUROPENNE EUROPAISCHE NORM EN 12573-2 March 2000 ICs 23.020.1 O English version Welded static non-pressurized thermoplastic tanks - Part 2: Calculation of vertical cylindrical tanks Cuves statiques soudes en m
9、atires thermoplastiques sans pression - Partie 2: Calcul des cuves cylindriques verticales Geschweite ortsfeste drucklose Behlter (Tanks) aus Thermoplasten - Teil 2: Berechnung von runden stehenden Behltern (Tanks) This European Standard was approved by CEN on 14 February 2000. CEN members are bound
10、 to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this Europsan 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 Cen
11、tral 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 as
12、 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 COMMITTEE FOR STANDARDIZATI
13、ON COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR 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 12573-2:2000 E STD.BS1 BS EN 12573-2-ENGL 2000 W! Lb24
14、hh 08828V3 T5b II Page 2 EN 12573-2:2000 Contents Page 3 Foreword -. 3 1 Scope . 4 2 Normative references . 4 3 Symbols and abbreviations 4 General principles 7 7 5 Temperature . 8 6 Cylinder dimensions . 8 6.1 General 9 6.2 Lower band 12 6.3 Other bands . 13 6.4 Cylinder made from sheets . 14 7 Bas
15、e thickness . 15 8 Roof dimensions . 16 9 Nozzles 16 1 O Lifting lugs 18 Annex A (informative) A-deviations . . . O BSI 11-2000 Page 3 EN 12573-212000 Foreword This European Standard has been prepared by Technical Committee CENTTC 266, Thermoplastic static tanks, the Secretariat of which is held by
16、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 September 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. EN 12573:1999, Welded static non-pressur
17、ized thermoplastic tanks, consists of: Part 1 : General principles; 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. According to the CENKENELEC Internal Regulations, the national sta
18、ndards 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 Kingdom. 1 Scope T
19、his standard establishes rules for the design and calculation of welded static, vertical, non-pressurized, cylindrical, flat-bottom thermoplastic tanks. This standard applies to tanks fabricated in the following thermoplastics: Polyethylene (PE) Polypropylene (PP) Poly (vinyl chloride) (PVC) Poly (v
20、inylidene fluoride) (PVDF) This standard does not take into account wind and/or snow loading.lf wind or/and snow loading has to be taken into account additional calculations are necessary. This standard is applicable to tanks in which the cylindrical shell is made of welded plates or a wound cylinde
21、r or an extruded pipe. The calculation takes into account short-term and long-term active pressures as well as the hydrostatic loading. The following values are long-term pressures and represent the limiting values: Overpressure: 0,000 5 N/mm2 (0,005 bar) Low pressure: 0,000 3 N/mm2 (0,003 bar) This
22、 standard is only applicable to tanks which are not intended to withstand internal pressure or vacuum, other than that which may occur during the transfer of fluids (including gases) in their normal operation. O BSI 11 -2000 - STD.BSI BS EN 12573-2-ENGL 2000 B Lb24669 0882845 829 Page 4 EN 12573-2:2
23、000 2 Normative references 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 amendments to or re
24、visions 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. EN 12573-1 :2000 Welded static non-pressurized thermoplastic tanks - Part 1 : General principl
25、es. EN 1778 Characteristic values for welded thermoplastic constructions - Determination of allowable stresses and moduli for design of thermoplastic equipment. 3 Symbols and abbreviations For the purposes of this part of this standard, the following symbols and abbreviations apply. is the depth of
26、the weld seam, in millimetres is the width of the nozzle compensation around the nozzle, in millimetres is the load increase factor is the material specific design factor is the design factor for a two layered tank is ci x c2 is the nominal inside diameter of the tank, in millimetres is the nozzle o
27、utside diameter, in millimetres is the diameter of hole in lifting lug, in millimetres is the allowable creep modulus at the design condition for stability (temperature, stress, time, medium, safety), in newton per square millimetre, see EN 1778 is the long-term welding factor is the acceleration du
28、e to gravity, in metre per square second (9,81 m/s*) is the surface related weights, in newton per square millimetres is the height at the maximum filling capacity, in millimetres is the height of the liquid above the lower edge of the band (i), in millimetres is the total cylindrical height, in mil
29、limetres is the height of the lower band, in millimetres is the height of the equivalent middle band from stability calculations, in millimetres is the height of the equivalent upper band from stability calculations, in millimetres is the height of the equivalent lower band from stability calculatio
30、ns, in millimetres is the continuously active external pressure, in newton per square millimetres is the continuously active internal pressure, in newton per square millimetres is the overpressure at the tank base due to the contents, in newton per square millimetres is the overpressure at lower edg
31、e of the band (i) due to the contents, in newton per square millimetres is the safety factor (see part 1) is the temperature of the outside air, in degrees Celsius is the temperature of the roof, in degrees celsius is the contents temperature, in degrees celsius is the calculated thickness of the ba
32、nd omitting the welding factor f from the calculation of aal., in millimetres is the thickness of the base, in millimetres O BSI 11-2000 Page 5 EN 12573-2:2000 is the thickness of the roof, in millimetres is the thickness of the equivalent middle band from stability calculations, in millimetres is t
33、he thickness of the equivalent upper band from stability calculations, in millimetres is the thickness of the equivalent lower band from stability calculations, in millimetres is the thickness of the equivalent lower band from the stress calculation, in millimetres is the thickness of the band (i) i
34、n the case of varying skin thickness tanks, in millimetres is the thickness of the lowest band of single layered tanks, in millimetres is the thickness of the nozzle compensation plus the calculated element thickness, in millimetres is the overall thickness of the lowest band of a multilayered tank,
35、 in millimetres is the thickness of the outer wall of a multilayered tank, in millimetres is the thickness of the inner wall of a multilayered tank, in millimetres is the filling volume, in cubic millimetres is the weakening coefficient is the angle of inclination of the roof, in degrees is the perm
36、issible edge expansions, in percent is the buckling coefficient is the density of the thermoplastic material, in gram per cubic centimetres is the density of the contents, in gram per cubic centimetres is the allowable stress at the design condition, in newton per square millimetre, see EN 1778 The
37、Figures I to 4 illustrate the main dimensions of tanks. a x Figure 1 - Open flat-base tank with constant wall thickness o BSI 11 -2000 Page 6 EN 12573-212000 Figure 2 -Open flat-base tank with varying wall thickness (three bands) Figure 3 - Flat-base tank with conical roof and constant wall thicknes
38、s O BSI 11 -2000 Page 7 EN 12573-2:2000 I Figure 4 - Flat-base tank with conical roof and varying wall thickness (three bands) 4 General principles General principles shall be according to EN 12573-1 :2000. 5 Temperature The effective wall temperature is an important factor in determining the dimens
39、ions of a tank. The cylinder and base components shall be designed using the average temperature of the contentsT. The roof component shall be designed using the average of the two neighbouring air temperatures. The air temperature in the tank is assumed to be TM. The surrounding air temperature TA
40、for indoor installation is assumed to be 20 OC. Figure 5 indicates the temperature zones. The temperature of the roof shall be calculated according to equation (i). TD = (TM + TA)/2 Q BSI 11-2000 STD.BSI BS EN 12573-2-ENGL 2000 S 1624669 0882849 474 9 Page 8 EN 12573-212000 f Figure 5 - Definition o
41、f the effective temperatures 6 Cylinder dimensions 6.1 General The tank cylinders within the scope of this calculation method are either single layered (see 6.2.1) or multilayered (see 6.2.2). The wall thickness shall be determined by the ring tensile stress resulting from the contents and overpress
42、ure at the lower edge of the cylinder. The minimum wall thickness shall be at least 4 mm. In the case of cylinders made from sheets, the appropriate long-term welding factor shall be used in the calculation of aal. according to EN 1778. Prerequiste for the calculation and the design of the tanks is,
43、 that the out-of-roundness of the cylinder near base of the tank is according to equation (2). where U dmaw x mt Figure 6 -Tank with a two layered cylinder 2. both layers are in full contact; 3. each layer is welded as shown in Figure 7; 4. the characteristic values of the materials of both layers s
44、hall be the same; 5. the thickness of the outer layer shall be between 0,5 times and 1 ,O times of the thickness of the inner layer. C3 = 1,25 for welds according to Figure 7 The overall wall thickness of the two layers shall be calculated according to equation (5). tZF = c3 X tZF The minimum height
45、 of the outer layer shall be calculated according to equation (6). O BSI 11-2000 STD.BSI BS EN 12573-2-ENGL 2000 I Lb24bb9 0882852 Tbq I Page 11 EN 12573-2:2000 t= ZF -1 9d c) Figure 7 - Welds for tanks with multilayered cylinders, C3 = 1,25 o BSI 11-2000 STD*BSI BS EN 12573-2-ENGL 2000 Lb24bb7 0882
46、853 7T5 b Page 12 EN 12573-2:2000 6.3 Other bands The minimum thickness of any other band (i) (where (i) is a vaue from 1 to n) shall be the greater value calculated from a) orb). When a reinforcement ring is provided in the upper band, its thickness shall be 0,6 to 1 times the thickness of the uppe
47、r band and its depth shall be at least 1 O0 mm. a) Cylinder band thickness calculation based on stress The minimum thickness t(i) shall be calculated according to equation (7). where Pstat(i) = PF x g x hF(,) x b) Cylinder band thickness calculation based on stability This approach requires the crea
48、tion of a simplified equivalent cylinder, see Figure 8, using equations (8), (9), (IO) and Table 2. Figure 8 - Equivalent cylinder O BSI 11-2000 STD.BSI BS EN 12573-2-ENGL 2000 Lb24bb9 08828511 031 to 4-n lu tu Page 13 EN 12573-22000 tm(1 + 5A)/4 2A x tm tm - lo (hz - 10)/2 - hz - 21, Im 2tm - to 2t
49、m - to tm The minimum thickness r, shall be calculated according to equation (8). The minimum thickness for the equivalent cylinder bottom band results from the calculation of the ring tensile stress according to equation (9). The buckling coefficient A shall be calculated in accordance with equation (10). Table 2 - Dimensions of the cylinder comparing three bands The wall thicknesses listed in Table 2 are minimum wall thicknesses. The height of the upper band shall not be greater than the value specified in Table 2. 6.4 Cylinder made from sheets The resi
