1、DEUTSCHE NORM June 199( Welded and loose support rings for use with process engineering vessels Part 1: Calculation of design strength DIN 28084-1 ICs 71.120.10 r This standard, together with DIN 28084-2 and DIN 28084-3, June 1996 editions, supersedes the September 1982 edition Descriptors: Support
2、rings, process engineering, vessels, calculation, design strength. I Tragringe und Ringtrger an Apparaten - Teil 1 : Festigkeitsberechnung of DIN 28084. In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used througho
3、ut as the decimal marker, Dimensions in mm Contents Page Page Foreword . .I 5.1 General .4 1 Scope and field of application .I 5.2 Design aSSUmpti0nS .4 5.3 Maximum safe working load for support rings 5 6 Diagrams 7 2 Normative references . .2 3 Quantities, symbols and units .2 . 4 Design features a
4、nd dimensions . .4 6.1 Parameter Z, .7 5 Calculation of design strength . .4 6.2 Parameter Z, .8 Foreword This standard has been prepared by Technical Committee Tragelemente of the Normenausschu Chemi- scher Apparatebau (Process Engineering Standards Committee). Amendments In comparison with the Sep
5、tember 1982 edition of DIN 28084, the following amendments have been made: a) The standard has been divided into three parts. b) The calculation of the design strength included in DIN 28084-1 has been completely revised on the basis of AD-Merkblatt (AD Code of practice) S 3/51. Previous edition DIN
6、28084: 1982-09. 1 This standard provides a method for calculating the design strength of welded and loose support rings mainly used in process engineering to secure vessels to bearing frames. Further specifications regarding the design and dimensions of support rings are covered by DIN 28084-2. DIN
7、28084-3 deals with support rings designed to DIN 28084-2 for mixing vessels made from unalloyed or stainless steel as specified in the DIN 28136 series. For specifications on glass-lined steel mixing vessels, refer to DIN 28145-4. Scope and field of application Continued on pages 2 to 8. Translation
8、 by DIN-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text. O No part of this translation may be reproduced without the prior permission of Ref. No. DIN 28084-1 : 1996-06 DIN Deutsches lnstitut frNormung e. V., Berlin. English price group 08
9、Sales No. O108 03.98 Beuth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-NomenJ. Page 2 DIN 28084-1 1996-06 Symbol dl 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publications. These norma- tive refer
10、ences are cited at the appropriate places in the text and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated into it by amendment or revision. For undated references,
11、the latest edition of the publication referred to applies. DIN 28084-2 Welded and loose support rings for use with process engineering vessels - Design features, dimensions and maximum working loads DIN 28084-3 Welded and loose support rings for use with process engineering vessels - Dimensions and
12、maximum working loads of rings for unalloyed and stainless steel mixing vessels DIN 28136-1 Mixing vessels for use in process engineering - Principal dimensions Supplement 1 to DIN 28136-1 Mixing vessels for use in process engineering - Maximum safe working load for glass-lined steel vessels DIN 281
13、 36-2 Unalloyed and stainless steel mixing vessels for use in process engineering -Arrangement and size of cover nozzles and manholes DIN 281 36-3 Glass-lined steel mixing vessels for use in process engineering -Arrangement and size of cover nozzles and manholes DIN 28136-4 Mixing vessels for use in
14、 process engineering -Wall thickness of unalloyed and stainless steel vessels Supplement 1 to DIN 28136-4 Unalloyed and stainless steel mixing vessels - Examples of calculating wall thickness DIN 28136-1 1 Mixing vessels - Arrangement and sizes of cover nozzles for type CE glass-lined steel mixing v
15、essels of 4 O00 i nominal capacity (not intended for new designs) DIN 28136-13 Mixing vessels -Arrangement and sizes of cover nozzles for type BE glass-lined steel mixing vessels of 2 500 i nominal capacity DIN 28145-4 Welded fittings for glass-lined steel mixing vessels - Support rings AD-Merkblatt
16、 S 3/5 Allgemeiner Standsicherheitsnachweis fr Druckbehlter; Behlter mit Ringlagerung (Stability analysis for pressure vessels supported on rings), February 1995 edition Richtlinienkatalog Festigkeit (Part 2), BR-A 65*), 3rd ed. Unit Quantity mm Vessel outside diameter 3 Quantities, symbols and unit
17、s Table 1 d2 d4 mm mm Diameter of bearing frame Outside diameter of vessel jacket d7 fa Outside diameter of loose support ring, or of welded support ring designed for use without loose ring mm - Outside diameter of welded support ring designed for use with loose ring Correction factor (fa = 2 for tw
18、o-piece rings and fa = 1 for one-piece rings) d, I mm I Inside diameter of loose support ring Fb FG FQ N N Maximum load N Maximum load due to bending moments Maximum load due to transverse loading I (continued) *) Obtainable from Linde KCA Dresden GrnbH, PO Box 12 O1 84, D-01003 Dresden. Page 3 DIN
19、28084-1 : 1996-06 Ki K.6 nS S SP s3 s4 Se Table 1 (concluded) - Nimm2 - - Safety factor mm rnm mm mm Factor taking into account the dimensions of welded support ring Design strength (at design temperature) Number of support points (cf. figures 9 and 1 O) Thickness of welded support ring designed for
20、 use without loose ring Thickness of welded support ring designed for use with ring Thickness of loose support ring Actual thickness of vessel shell or vessel jacket I Symbol 1 Unit I 20 Zl Quantity Parameter related to lever arm as specified in figure 9 Parameter related to lever arm as specified i
21、n figure 10 - - I Welding factor representing the utilization of design stress for welds I 1 Resistance load coefficient Line load coefficient - 6 Support ring welded to vessel shell Design for use without loose ring f Welded * Design for use with loose ring Welded support ring 2, Loose support ring
22、 3) Support ring welded to vessel jacket Design for use without loose ring Welded support ring l) Design for use with loose ring Welded support ring 7, Loose support ring 3) II l) For details, see figures 7 and 8. 2, For details, see figures 5 and 6. Figure 1: Welded and loose support rings 3, For d
23、etails, see figures 3 and 4. Page 4 DIN 28084-1 1996-06 4 Design features and dimensions The welds joining support rings to vessel shells or jackets shall be continuous and capable of accommodating maximum loads. As specifications of clause 5 relate to bearing frame openings and ring supports of var
24、ious diameters, the location of the lines of application of force and lever arms (cf. subclauses 5.2.1, 5.2.2 and figures 3 to 8) differ from case to case. The following calculations are based on the assumption that, as shown in figure 2, support rings are concentric with the bearing frame opening a
25、nd the load is borne either by the entire bearing surface (full-face support) or by eight individual points of support (single-point support). NOTE: Care should be taken so that the bearing surface is not deformed. I) Diameter, d, as illustrated here, is the effective inside diameter defined by the
26、eight points of support. Figure 2: Single-point support 5 Calculation of design strength 5.1 General The ring thickness is to be calculated according to AD-Merkblatts 3/5, with a distinction being made between full-face and single-point support rings. The following method may be used to either deter
27、mine the maximum safe working load of support rings with a given thickness or the minimum thickness required for a given load. It may be applied by analogy for support rings with dimensions other than those specified in DIN 28084-2 and DIN 28084-3 as long as the width (outside diameter minus inside
28、diameter) of rings exceeds the thickness. 5.2 Design assumptions Where support rings are welded to the vessel, it is assumed that the shell or jacket is under maximum internal pressure. Where this is not the case, the Richtlinien-Katalog Festigkeit provides an appropriate method of calculation by wh
29、ich greater maximum loads may be obtained for a particular ring thickness. Depending on the type of support (full-face or single-point), the maximum safe working load varies. It is assumed that - diameter d, is greater than diameter d, (see figures 3 and 4); - diameter d, is smaller than diameter d,
30、 in the case illustrated in figure 5; - diameter d, is greater than diameter d, in the case illustrated in figure 6. The assumptions regarding the lever arms of ring supports made in subclauses 5.2.1 and 5.2.2 are on the safe side as they allow for a certain degree of elastic deformation or imperfec
31、tions resulting from the ring manufac- turing process (e.g. caused by weld distortion). In the case of full-face support rings, it is assumed that the inner edge of the bearing frame will not be overloaded. By improving the vessel design, lower thickness values than those obtained by calculations ba
32、sed AD-Merkblatt S 315 may be obtained. 5.2.1 Loose support rings The calculation of lever arms for loose support rings is based on the following assumptions: a) for all types of support, the inside bearing diameter shall be deemed equal to d,; b) for full-face support rings, the outside bearing dia
33、meter shall be deemed equal to 0,5 (d4 + dJ (see figure 3); c) for single-point support, the outside bearing diameter shall be deemed equal to d, (see figure 4). Page 5 DIN 28084-1 1996-06 Welded support ring 4 Loose (one-piece or two-piece) support ring Welded support ring Figure 3 Figure 4 5.2.2 W
34、elded support rings The calculation of lever arms for welded support rings is based on the following assumptions: a) for all types of support, the inside bearing diameter shall be deemed equal to d, or d,; b) for welded rings used with loose rings, the outside bearing diameter shall be deemed equal
35、to d, (see figures 5 and 6); c) for support rings used without loose rings, the outside bearing diameter shall be deemed equal to 0,5 (d4 + d5) (see figure 7); d) for single-point supports, the outside bearing diameter shall be deemed equal to d, (see figure 8). dl Welded support ring -1 Welded supp
36、ort ring I/ rnl di Figure 5 Figure 6 Welded support ring Welded support ring Figure 7 Figure 8 5.3 Maximum safe working load for support rings The maximum safe working load, F, need only be calculated for ring supports of dimensions other than those specified in DIN 28084-2 or DIN 28084-3. 5.3.1 Loo
37、se rings with full-face support (see figure 3) 3C.ZJ.K, .Si(dg -de) FG = N fa S(d, +d, -2d,) 5.3.2 Loose rings with single-point support (see figure 4) F, = min Fb, FQ N Page 6 DIN 28084-1 : 1996-06 4.v.K, .s,(d5 -d6) FQ = N fa .S 1 IC, = s4 1- (d5 - d6 A) : Parameters Z, and 2, are to be taken from
38、 the diagrams in figures 9 and 1 O, where - 0,5( d5 f d5 = and d=- d6 - d5 24 5.3.3 Welded support rings used without loose ring, full-face support (see figure 7) FG = N nc.v.K, .sg(d5 -d) S( d, + d, - 2d) where d 0 d, for vessels without jacket; d 0 d, for jacketed vessels. 5.3.4 Welded support rin
39、gs used together with loose ring (see figures 5 and 6) The following equation applies to this type of support ring for vessels with or without jacket and irrespective of the type of support. nc.v-K, -si 2.s FG = N 5.3.5 Welded support rings used without loose ring, single-point support (see figure 8
40、) F, = min Eb, EQ N where nc.4.v.K, ,s;(d5 -d) Fb = N S. d5 JZi + Z: . K: 4.u-K, .sp(d5 -d) S N FQ = 1 KI = s2 1,5. (d, - d) and d P d, for vessels without jacket; d P d2 for jacketed vessels. 1- (9) Page 7 DIN 28084-1 : 1996-06 B) : Parameters Z, and Z, are to be taken from the diagrams in figures
41、9 and 10, where d, - 0,5( d, + d) d5 = and 6= d - 0,5( d5 + d) d5 6 Diagrams 6.1 Parameter Zo 6 +o, 20 +0,15 +o, 10 +O, 05 0,oo -0,05 -0.01 -0.15 -0,ZO 4,OO 3,OO 2.50 2,oo 1,80 1,60 1 ,GO 1.20 l,oo 0,90 zo 0.80 0,70 0,60 0,50 0,40 0,30 0.25 -0,20 -0,lO O +o, 10 +0,20 Figure 9 Page 8 DIN 28084-1 1996
42、-06 I I I 6.2 Parameter Z, l 1 I l I I l l I l I -0, O +O, I I I II I II I I 5-9- 05-4 I I l IIIII I I I 0.70 O, 60 0.50 0,40 0,30 o, 25 0,20 o, 18 0,16 O, I4 o, 12 0,10 0,09 0,08 0,0-t 0,06 0,05 4 O, 04 0,03 O, 025 0,02 0,015 0,01 o, O09 O, 008 o, O07 O, 006 O, 005 -0,zo -0,lO O +o, 10 +o, 20 Figure 10
