1、STD=BSI BS EN 12573-3-ENGL ZOO0 W Lb24669 0882861 T7L BRITISH STANDARD Welded static non-pressurized thermoplastic tanks - Part 3: Design and calculation for single skin rectangular tanks The European Standard EN 125733.2000 has the status of a British Standard ICs 23.020.10 NO COPYING WITHOUT BSI P
2、ERMISSION EXCEPT AS PERMITTED BY COPYRIGm LAW $3 EN 25 73-3:ZOOO STD.BS1 BS EN L2573-3-ENGL 2000 1624669 0882862 708 111 BS EN 12573-3:2000 direction of the Sector Committee for Materials and Chemicals, was published under the authoris of the Standards Committee and comes into effect on 15 November
3、2000 Amd. No. O BSI 11-2000 National foreword Date Comments This British Standard is the official English language version of EN 125733:2000. The UK participation in its preparation was entrusted to Technical Committee PRV62, Static thermoplastic tanks, which has the responsibility to: - aid enquire
4、rs to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposais for change, and keep the UK interests informed; them in the UK A list of organizations represented on
5、this committee can be obtained on request to its secretaxy. 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 Index”
6、, or by using the “Fnd 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 Standard does not of itself confer
7、immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 33 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. ISBN O 580 34919 5 STD-BSI BS EN 12573-3
8、-ENGL 2000 E Lb24bb9 0882863 844 EUROPEAN STANDARD EN 125733 NORME EUROPENNE EUROPISCHE NORM March 2000 ICs 23.020.10 English version Welded static non-pressurized thermoplastic tanks - Part 3: Design and calculation for single skin rectangular tanks Cuves statiques soudes en matieres thermoplastiqu
9、es sans pression - Partie 3: Conception et calcul des cuves paralllpipdiques rectangles simple paroi Geschweite ortsfeste drucklose Behlter (Tanks) aus Thermoplasten - Teil 3: Konstruktion und Berechnung von einwandigen Rechteckbehltern (-tanks) This European Standard was approved by CEN on 14 Febru
10、ary 2000. CEN members are bound 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 slch national standards may be obt
11、ained on application to the Central 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 Sec
12、retariat has the same status as tie 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. EURO
13、PEAN COMMITEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 8-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12573-22000 E STD.BSI B
14、S EN 12573-3-ENGL 2000 H 1624667 O8828b4 780 Page 2 EN 12573-3:2000 Contents Page Foreword . 3 1 Scope . 3 2 Normative references . 4 3 Definitions. symbols and abbreviations 4 3.1 Definitions 4 3.2 Symbols and abbreviations . 4 4 General considerations in design calculations . 5 5 Unstiffened tanks
15、 sitting on a continuous flat rigid surface 6 5.1 General . 6 5.2 Aspect ratio xly 4 8 6 Tanks with rim stiffening supported on a continuous flat rigid surface . 8 6.1 Calculation of the skin thickness 8 6.2 Calculation of rim stiffeners 10 7 Tanks with intermediate horizontal stiffeners supported o
16、n a continuous flat rigid surface 11 7.1 General . 11 7.2 Calculation of the minimum skin thickness . 11 7.3 Calculation of the horizontal stiffeners . 13 8 Tanks with cross-ribbed horizontal and vertical stiffeners supported on a continuous rigid surface . 14 8.1 Calculation of the minimum skin thi
17、ckness. base thickness and properties of horizontal stiffeners 14 8.2 Calculation of the properties of vertical stiffeners . 14 9 Rectangular tanks with U-frame . 15 9.1 General . 15 9.2 Calculation of the skin thickness of the side walls 15 9.3 Determination of the tank base . 15 9.4 Calculation of
18、 the U-frame stiffening 16 10 Determination of the tank cover . 16 10.1 General 16 10.2 Freely supported tank cover . 16 10.3 Fixed tank cover . 17 10.4 Stiffened tank cover . 19 Annex A (informative) Construction details for rectangular tanks 21 Annex B (informative) Special cases 30 Annex C (infor
19、mative) A-deviations 32 Bibliography . 33 STDmBSI BS EN 12573-3-ENGL 2000 Lb24bb9 0882865 b27 Page 3 EN 12573-312000 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
20、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. The informative Annex A gives some construction details of rectangular tan
21、ks as examples. EN 12573:2000 Welded static non-pressurized 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 th
22、e CENICENELEC 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, Spain, S
23、weden, Switzerland and the United Kingdom. 1 Scope This standard specifies the design and calculation for single skin rectangular tanks, fabricated from the following thermoplastics: Polyethylene (PE) Polypropylene (PP) Poly (vinyl chloride) (PVC) Poly (vinylidene fluoride) (PVDF) The tanks may be s
24、trengthened on the outside by means of ribs or frames made of the same or other materials. 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 operat
25、ion. The calculation takes into account short-term and long-term active pressures as well as the hydrostatic loading. The following values are long- tem pressures and represent the limiting values: Overpressure: 0,0005 N/mm2 (0,005 bar) Low pressure: 0,0003 N/mm2 (0,003 bar) Plate theory was used as
26、 the basis of the calculation in this document. Reference to membrane theory is given in Annex B. STD-BSI BS EN 12573-3-ENGL 2000 .I 1624667 0882866 553 Page 4 EN 12573-32000 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications.
27、 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 amendment or revision. For u
28、ndated references the latest edition of the publication referred to applies. EN 12573-1 :2000 EN 1778 Welded static non-pressurized thermoplastic tanks - Part 1 : General principles Characteristic values for welded thermoplastic constructions - Determination of allowable stresses and moduli for desi
29、gn of thermoplastic equipment 3 Definitions, symbols and abbreviations For the purposes of this part of this standard the following definitions, symbols and abbreviations apply: 3.1 Definitions 3.1.1 Skin: Basic structural element of the tank. 3.1.2 Stiffener: Section attached horizontally or vertic
30、ally to the skin of the tank. 3.1.3 Wall: Skin of the tank plus stiffeners. 3.1.4 Panel: Area of the skin between stiffeners. 3.1.5 U-frame: Stiffener running beneath the base and vertically up the side of the tank. 3.2 Symbols and abbreviations E E ca1.b F f J k M N P Pm Pl t W PD X X Y Y Z a1 . a5
31、 l . 5 is the elastic modulus of the stiffener material (with plastics, this corresponds to E), in Newtons per square millimetre is the allowable creep modulus at the design condition for deformation (temperature, stress, time, medium), in newtons per square millimetre, see EN 1778 is the force, in
32、newtons is the maximum deflection, in millimetres is the moment of inertia of stiffener, in millimetres to the fourth power is the correction coefficient for the deflection of the wall is the bending moment, in newton millimetres is the rigidity coefficient is the excess pressure on the tank base, i
33、n newtons per square millimetre is the uniformly distributed load acting on the cover, in newtons per square millimetre is the mean value of excess pressure for calculation of skin thickness, in newtons per square millimetre is the mean value of excess pressure for calculation of the stiffener, in n
34、ewtons per square millimetre is the skin thickness, in millimetres is the moment of resistance of rim stiffeners, in cubic millimetres is the length of the tank or distance between the vertical stiffeners, in millimetres is the effective length of panels assigned to stiffeners, in millimetres is the
35、 depth of the tank or distance between the horizontal stiffeners, in millimetres is the effective depth of panels assigned to stiffeners, in millimetres is the width of the tank or panel, in millimetres is the deformation coefficient is the stress coefficient 41. is the allowable stress, in newtons
36、per square millimetre, see EN 1778 STD-BSI BS EN 12573-3-ENGL 2000 lb24bb9 0882867 49T .I Page 5 EN 12573-3:2000 4 General considerations in design calculations General principles in accordance with EN 12573-1 :2000. Calculation methods are given only for the tank designs illustrated in Figures 1 to
37、 5. Welds should be situated in regions of low bending moments; the maximum bending moments are shown in Figures 6, 7 and 8. NOTE: The design should take account of the effects of thermal expansion between the tank wall and any external stiffening. The maximum deflection shall not be larger than the
38、 half skin thickness. fr0,5t For construction details of rectangular tank see Annex A. Figure 1: Unstiffened tank Figure 2: Tank with a horizontal rim stiffener Figure 3: Tank with intermediate horizontal stiffeners Page 6 EN 12573-312000 Figure 4: Tank with vertical stiffeners Figure 5: Tank with c
39、ross-ribbed horizontal and vertical stiffeners 5 Unstiffened tanks sitting on a continuous flat rigid surface 5.1 General The calculation of the minimum skin thickness depends on the ratio between the length (x) and depth (y) (see Figure 6). The thickness of the base shall be of similar magnitude to
40、 the actual thickness of the skin. Figure 6:Principal distribution of bending moments in an unstiffened tank STD.BS1 ES EN 12573-3-ENGL 2000 I Lb24bb9 08828b 2b2 m Page 7 EN 12573-32000 5.2 Aspect ratio xly e 0,5 The minimum skin thickness shall be calculated according to equation (1). NOTE 1: In eq
41、uation (1) for the skin thickness (t), the skin has been assumed as a beam fixed at both ends with the load distributed uniformly between these two points. This leads to a factor of 2 in the denominator. To provide better agreement with measured values, the factor was increased to 23. The maximum de
42、flection of the skin shall be calculated according to equation (2). The correction coefficient k is either 1 when x 4 The minimum skin thickness shall be calculated according to equation (5). EN 12573-312000 The maximum deflection of the skin shall be calculated according to equation (6). P Y4 3 f=
43、235 t NOTE: The tank wall here is considered as a cantilever with a triangular load. 6 Tanks with rim stiffening supported on a continuous flat rigid surface 6.1 Calculation of the skin thickness 6.1.1 General The calculation of the minimum skin thickness is based on the assumption that the rim stif
44、fening constitutes a firm support. The thickness of the base shall be of similar magnitude to the actual thickness of the skin (see Figure 7). = average area load 2 r Figure 7: Principal distribution of bending moments in a tank with rim stiffening STD-BSI BS EN 12573-3-ENGL 2000 m 1624669 0882871 9
45、10 m Page 9 EN 12573-312000 6.1.2 Aspect ratio Xly 2 The minimum skin thickness shall be calculated according to equation (1 1). The maximum deflection of the skin shall be calculated according to equation (12). NOTE: The tank wall here is considered on the one hand as a fixed beam and on the other
46、hand as a freely supported beam with triangular load. 6.2 Calculation of rim stiffeners The deflection of the rim stiffeners shall be calculated as a mean between a freely supported (f = 5/384) and a fixed beam (f = 11384) with a uniformally distributed load. The rim stiffening takes up 115th of the
47、 wall load as uniformally distributed load. To allow the rim stiffening to be assumed as a fixed support, its deflection shall not be greater than 1 % of the length or depth. The smaller distance has the greatest effect. The deflection of the rim stiffener shall be calculated according to equation (
48、I 3). f= PYX4 1280E J o95 P : 1 NOTE: The ratio p/l 280 comes from: 2x 5 x (L +A) 384 384 The maximum bending moment (M) in the rim stiffener shall be calculated according to equation (14). M=- PYX2 1 O0 The moment of resistance (W) of the rim stiffener shall be calculated according to equation (1 5
49、). (14) STD.BSI BS EN 12573-3-ENGL 2000 1b24bb 0882873 793 111 Page 11 EN 12573-3:2000 When the deflection (9 is used in the design calculations the moment of inertia (J) of the stiffener shall be calculated according to equation (16). J= PYX4 1280Ef NOTE: The bending moment of a beam with a linear load, which is considered as a mean between freely supported and fixed beam is: The tank wall is considered to be fixed at the bottom and to be freely supported at the rim stiffener. Consequently the load at the rim is 1/5th of the load on the tank wall. Hence, when
