1、DEUTSCHE NORM December 2000 Welded static non-pressurized thermoplastic tanks Part 2: Calculation of vertical cylindrical tanks English version of DIN EN 12573-2 DIN - EN 12573-2 ICs 23.020.1 O Geschweite ortsfeste drucklose Behlter (Tanks) aus Thermoplasten - Teil 2: Berechnung von runden stehenden
2、 Behltern (Tanks) European Standard EN 12573-2 : 2000 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been prepared by CEN/TC 266 Thermoplastic static tanks, WG 2 Thermoplastic tanks fabricated by fusion techniques. The responsible German
3、body involved in its preparation was the Normenausschuss Tankanlagen (Tank Installations Standards Committee), Technical Committee Tanks aus Thermoplasten. EN comprises 17 pages. No pari of this standard may be reproduced without the prior permission of Ref. No. DIN EN 12573-2 : 2000-1 Y Deutsches I
4、nstitut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, s the exclusive right of sale for German Standards (DIN-Normen). English price group O9 Sales No. 1109 05.01 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12573-2 March 2000 ICs 23.020.1 O English version Welded stati
5、c non-pressurized thermoplastic tanks Part 2: Calculation of vertical cylindrical tanks Cuves statiques soudes en matires thermoplastiques sans pression - Partie 2: Calcul des cuves cylindri- ques verticales stehenden Behltern (Tanks) Geschweite ortsfeste drucklose Behlter (Tanks) aus Thermoplasten
6、- Teil 2: Berechnung von runden This European Standard was approved by CEN on 2000-02-14. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lis
7、ts and bibliographical references concerning such national stand- ards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the resp
8、onsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg
9、, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization 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 f
10、orm and by any means reserved worldwide for CEN national members. Ref. No. EN 12573-2 : 2000 E Page 2 EN 12573-2 : 2000 Contents Page Foreword 3 1 Scope . 3 2 Nomative references 3 Symbols and abbreviations . 4 4 General pinciples . 7 5 Temperature 7 6 Cylinder dimensions 8 6.1 General . 8 6.2 Lower
11、 band . 8 6.3 Other bands . 6.4 Cylinder made from sheets 13 7 Base thickness 14 . . . 15 8 Roof dimensions . 9 Nozzles 15 1 O Lifting lugs . 16 Annex A (informative) A-deviations . 17 Page 3 EN 12573-2 : 2000 Foreword This European Standard has been prepared by Technical Committee CENKC 266 “Thermo
12、plastic static tanks“, 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 September 2000, and conflicting national standards shall be withdrawn at the latest
13、by September 2000. prEN 12573:1999 “Welded static non-pressurised 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
14、 to the CENKENELEC Internal Regulations, 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, Spa
15、in, Sweden, Switzerland and the United Kingdom. 1 Scope This standard establishes rules for the design and calculation of welded static, vertical, non-pressurised, cylindrical, flat-bottom thermoplastic tanks. This standard applies to tanks fabricated in the following thermoplastics: Polyethylene (P
16、E) Polypropylene (PP) Poly (vinyl chloride) (PVC) Poly (vinylidene 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 cyli
17、ndrical shell is made of welded plates or a wound cylinder 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: 0,0005 N/mm2
18、(0,005 bar) Low pressure: 0,0003 Nhm (0,003 bar) This 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. Page 4 EN 12573-2 : 2000 2 Normative
19、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 revisions of any o
20、f 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. prEN 12573-1 :1999 Welded static non-pressunsed thermoplastic tanks - Part 1 : General principles EN 177% Char
21、acteristic 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 the weld seam, in
22、millimetre is the width of the nozzle compensation around the nozzle, in millimetre is the load increase factor is the material specific design factor is the design factor for a two layered tank is ci x Ca is the nominal inside diameter of the tank, in millimetre is the nozzle outside diameter, in m
23、illimetre is the diameter of hole in lifting lug, in millimetre 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 due to gravity, in metre
24、per square second (9,81 ds2) is the surface related weights, in newton per square millimetre is the height at the maximum filling capacity, in millimetre is the height of the liquid above the lower edge of the band (i), in millimetre is the total cylindrical height, in millirnetre is the height of t
25、he lower band, in millimetre is the height of the equivalent middle band from Stability calculations, in millimetre is the height of the equivalent upper band from stability calculations, in millimetre is the height of the equivalent lower band from stability calculations, in millimetre is the conti
26、nuously active extemal pressure, in newton per square millimetre is the continuously active internal pressure, in newton per square millimetre is the overpressure at the tank base due to the contents, in newton per square millimetre is the overpressure at lower edge of the band (i) due to the conten
27、ts, in newton per square rnillimetre is the safety factor (see pari 1) is the temperature of the outside air, in degree Celsius is the temperature of the roof, in degree Celsius is the contents temperature, in degree Celsius is the calculated thickness of the band omitting the welding factor fi from
28、 the calculation of ual., in millimetre is the thickness of the base, in millimetre is the thickness of the roof, in millirnetre is the thickness of the equivalent middle band from stability calculations, in millimetre is the thickness of the equivalent upper band from stability calculations, in mil
29、limetre Page 5 EN 12573-2 : 2000 is the thickness of the equivalent lower band from stability calculations, in millimetre is the thickness of the equivalent lower band from the stress calculation, in millimetre is the thickness of the band (i) in the case of varying skin thickness tanks, in millimet
30、re is the thickness of the lowest band of single layered tanks, in millimetre is the thickness of the nozzle compensation plus the calculated element thickness, in millimetre is the overall thickness of the lowest band of a multilayered tank, in millimetre is the thickness of the outer wall of a mul
31、tilayered tank, in millimetre is the thickness of the inner wall of a multilayered tank, in millimetre is the filling volume, in cubic millimetre is the weakening coefficient is the angle of inclination of the roof, in degree is the permissible edge expansions, in percent is the buckling coefficient
32、 is the density of the thermoplastic material, in gram per cubic centimetre is the density of the contents, in gram per cubic centimetre is the allowable stress at the design condition, in newton per square millimetre, see EN fT/8 The figures 1 to 4 illustrate the main dimensions of tanks. Figure 1
33、: Figure 2: Open flat-base tank with varying wall thickness (three bands) Page 6 EN 12573-2 : 2000 Figure 3: Flat-base tank with conical roof and constant wall thickness Figure 4: Flat-base tank with conical roof and varying wall thickness (three bands) I 4 Page 7 EN 12573-2 : 2000 4 General princip
34、les General principles shall be according to prEN 12573-1:1999. 5 Temperature The effective wall temperature is an important factor in determining the dimensions of a tank. The cylinder and base components shall be designed using the average temperature of the contents TM. The roof component shall b
35、e 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 for indoor installation is assumed to be 20 OC. Figure 5 indicates the temperature zones. The temperature of the roof shall be calculated ac
36、cording to equation (1). TD = (TM + Tn)/2 =t= =t= Figure 5: Definition of the effective temperatures Page 8 EN 12573-2 : 2000 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 t
37、hickness shall be determined by the ring tensile stress resulting from the contents and overpressure 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 calculat
38、ion of aal. according to EN 1778. Prerequiste for the calculation and the design of the tanks is, that the out-of-roundness of the cylinder near base of the tank is according to equation (2). where U d, &in is the out-of-roundness of the cylinder in % is the maximum inside diameter of the tank in rn
39、m is the minimum inside diameter of the tank in mm 6.2 Lower band 6.2.1 Single layered cylinders The minimum thickness of the lowest band shall be calculated according to equation (3). where psal = PF X g X hF X pi = 0,0005 N/ mm2 The minimum height of the lower band shall be calculated according to
40、 equation (4). hzF2 1,44cl.t, Page 9 EN 12573-2 : 2000 Materials PE-HD PP-H (Typ 1) Factor C for the welded transition of the base-cylinder connection is the product of the load increase factor Ci = 1,2 and a material specific design factor C, as specified in table I. ce c=cix cp 1 ,o0 1,20 1,17 1,4
41、0 Ci = 1,2 is only applicable when a base fillet weld is carried out with a weld seam thickness of a t 0,7 ts and a long- term welding factor fi 0,s). A proof of the stress in the weld seam can be omitted in that case. PP-B (Typ 2) PP-R (Typ 3) Table 1 : Material specific design factor Cz and factor
42、 C for thermoplastic materials 1 ,O8 1,30 1 ,o0 1,20 PVC-U (normal impact strength) PVC-RI (of raised impact strength) 1,25 1,50 1 ,O8 1,30 PVC-HI (of high impact strength) I 1,oo I 1,20 PVC-c I 1.33 I 1.60 I I I II PVDF I 1,17 I 1,40 Il NOTE: Cp is the relationship between relaxation and creep rupt
43、ure behaviour determined for PE-HD by experience. The values for other materials are relative to the value for PE-HD. 6.2.2 Multilayered cylinders Multilayered cylinders shall be calculated according to 6.2.1 including a factor C3 and assuming that: 1. only two layers are allowed, see figure 6 *) Fo
44、r tanks with a max. capacity up to 1000 litres and a wall thickness up to 10 mrn, hot gas welding is allowed when internal and external welding is employed. Page 10 EN 12573-2 : 2000 Figure 6: Tank with a two layered cylinder 2. both layers are in full contact 3. each layer is welded as shown in fig
45、ure 7 4. the characteristic values of the materials of both layers shall 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 Page 11 EN 12573-2 : 2000 The overall wall thickness of th
46、e two layers shall be calculated according to equation (5). The minimum height of the outer layer shall be calculated according to equation (6). b) c) Figure 7: Welds for tanks with multilayered cylinders, Ct = 1,25 Page 12 EN 12573-2 : 2000 6.3 Other bands The minimum thickness of any other band (i
47、) (where (i) is a vaue from 1 to n) shall be the greater value calculated from a) or b). When a reinforcement ring is provided in the upper band, its thickness shall be 0,6 to 1 times the thickness of the upper band and its depth shall be at least 100 mrn. a) Cylinder band thickness calculation base
48、d on stress The minimum thickness tZ() shall be calculated according to equation (7). where b) Cylinder band thickness calculation based on stability This approach requires the creation of a simplified equivalent cylinder, see figure 8, using equations (E), (9), (IO) and table 2. Figure 8: Equivalen
49、t cylinder Page 13 EN 12573-2 : 2000 hi 1/3 113 e A c 112 lo h. hz h. hz to trn*(l +5*h)/4 2.A.tm ItTl IO (hz - &)I2 I“ hZ - 2 lo INI tu 2.tm-to 2.tm-to The minimum thickness t, shall be calculated according to equation (8). 112 5 A - trn - - trn 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 (1 O). A.=- tm lo - 2. tU hz The wall thicknesses listed in table 2 are minimum wall thicknesses. The he
