1、DEUTSCHE NORM Auaust 1999 ICs 23.040.80 Flanschverbindungen mit Dichtlinse Supersedes April 1972 edition. In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. Foreword This standar
2、d has been prepared by Technical Committee Flansche und ihre Verbindungen of the Normen- ausschuss Rohre, Rohrverbindungen und Rohrleitungen (Pipes and Pipe Joints Standards Committee). Amendments This standard differs from the April 1972 edition as follows: a) The standard now only covers nominal s
3、izes up to DN 200. b) For each PN designation (except for PN 400), two dimension series per nominal size have been specified. c) Technical delivery conditions have been specified. d) Appendices A and B have been included. Previous edition DIN 2696: 1972-04. All dimensions are in millimetres 1 Scope
4、This standard applies to lenticular ring joint gaskets for flanged joints in piping systems operating at pressures exceeding 63 bar. It specifies dimensions and the design of DN 1 O to DN 200 gaskets rated for pressures from 63 bar to 400 bar. 2 Normative references This standard incorporates, by da
5、ted or undated reference, provisions from other publications. These normative references 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 standa
6、rd only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. DIN 2627 PN 400 welding neck flanges DIN 2628 PN 250 welding neck flanges Continued on pages 2 to 12 Translation by DIN-Sprachendienst. In case of doubt, the G
7、erman-language original should be consulted as the authoritative text. No pari of this translation may be reproduced without the prior permission of V Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, s the exclusive right of sale for German Standards (DIN-Normen
8、). Ref. No. DIN 2696 : 1999-0 English price group O9 Sales No. 0109 03.01 Page 2 DIN 2696 : 1999-08 DIN 2629 DIN 2636 DIN 2637 DIN 2638 DIN EN 1092-1 DIN EN 1591 DIN EN 10088-1 DIN EN 10204 DIN EN 10222-2 AD-Merkblatt (AD Code of practice) B7 Schrauben (Screws and bolts) 2, AD-Merkblatt (AD Code of
9、practice) B8 Flansche (Flanges) 2) PN 320 welding neck flanges PN 64 welding neck flanges PN 1 O0 welding neck flanges PN 160 welding neck flanges Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1 : Steel flanges I) Flanges and their joints - Design rules for gaske
10、ted circular flange connections1) Stainless steels - Part 1 : List of stainless steels Inspection documents for metallic products (includes Amendment Al : 1995) Steel forgings for pressure purposes - Part 2: Ferritic and martensitic steels with specified elevated temperature properties (includes Cor
11、rigendum AC : 2000) 3 Concepts and symbols 3.1 Concepts 3.1.1 Lenticular ring joint gasket Lens-shaped sealing element for use in flanged joints. 3.1.2 Flanged joint assembly Joint assembly consisting of two flanges, tightening bolts and a gasket. 3.1.3 Gasket width Effective width resulting from th
12、e plastic deformation of the gaskets contact faces that occurs during assem- bly; designated by b, (cf. detail X in figure 1). For gaskets made of iron, b, is given by equation (1): d, x JG x R, b, = 0,58 x where F, r R, NOTE: DIN EN 1591 enables the gasket width to be determined both approximately
13、and exactly on the basis of the maximum permissible compressive stress, Q, rather than the tensile strength of the gasket material, R,. In the case of gas piping systems, AD-MerkblSitter B7 and B8 specify a gasket design based on an assumed constant width, k, of 2 mm or, k, of 6 mm 2, 3. Since the r
14、esults obtained in such calculations may deviate considerably from the actual dimensions, it is recommended that equation (1) be used for flange design calculations. Because the force FDN is itself a function of the gasket width, b, this value can only be determined iteratively. (equal to F,/sin 70“
15、) is the normal component of the gasket force; is the radius, in mm; is the tensile strength of the gasket material. 3.1.4 Gasket diameter Diameter lying approximately halfway between diameters di and d, as given by equation (2): d, = (di+ d,)/2 Designated by d, (cf. Appendix A). I) Currently at dra
16、ft stage. 2, Obtainable from Beuth Verlag GrnbH, 10772 Berlin, Germany. Page 3 DIN 2696 : 1999-08 3.2 Symbols, quantities and units Symbol Table 1 : Symbols, quantities and units Quantity Inside diameter of flange or flange facing, in mm Gasket diameter, in mm Inside diameter of gasket, in mm Outsid
17、e diameter of gasket, in mm Outside diameter of flange or flange facing, in mm Gasket height at d, in mm Gasket height at dD, in mm Gasket height at d, in mm Distance between raised faces, in mm Gasket width, in mm Radius, in mm Tensile strength, in N/mm2 Gasket force, in N Normal component of gaske
18、t force, in N Radial component of gasket force, in N l) Reductions in height due to rounded edges or chamfers may be ignored. 4 Designation Designation of a DN 50 lenticular ring joint gasket of dimension series 1 for a PN 160 flange, made of grade P245GH steel: Gasket DIN 2696 - Series 1 - DN 50 -
19、PN 160 - P245GH 5 Requirements 5.1 Design of facings Gaskets shall be used with weld-neck flanges of the same nominal pressure rating as the gasket and complying with DIN EN 1092-1, DIN 2627, DIN 2628, DIN 2629 or DIN 2638, use of other flanges of equivalent design being permitted. Flange facings sh
20、all be tapered so that they form an included angle of 140“ when flanges are assembled. The gasket facings shall be spherical. See Explanatory notes for other designs. The surface roughness parameter RZ of facings shall be 6,3 pm in the radial direction. Surfaces shall be free of cracks and scratches
21、. 5.2 Dimensions The dimensions of gaskets shall be as specified in figure 1 and tables 2 to 12. Page 4 DIN 2696 : 1999-08 1 O0 125 150 200 Figure 1 : Gasket dimensions (notation) Table 2: Dimensions of series 1 gaskets for PN 63 flanges as in DIN 1092-1 18,7 171,O 117,O 127,O 15,O 107,O 22,l 143,O
22、7,9 26,9 210,O 143,6 157,O 22,o 131 ,O 31,2 180,O 11,7 30,6 249,o 170,s ia3,o 26,O 158,O 34,9 21 0,o 14,2 34,O 327,O 223,7 243,O 27,O 205,O 40,5 276,O 12,4 Page 5 DIN 2696 : 1999-08 DN 10 15 Table 3: Dimensions of series 2 gaskets for PN 64 flanges as in DIN 2636 h, r d, d5 X dl hl d2 h2 68 23,O 15,
23、7 18,O 6,O 14,O 7,4 21 ,o 4,5 7,9 32,O 21,9 27,O 6,O 18,O 9,1 28,O 5,3 Table 4: Dimensions of series 1 gaskets for PN 100 flanges as in DIN EN 1092-1 25 40 50 65 80 8,O 49,O 33,5 39,O 6,O 29,O 9,5 43,O 4,0 10,3 71 ,O 48,6 55,O 8,O 43,O 12,2 62,O 4,7 11,6 89,O 60,9 68,O 9,o 54,O 13,9 78,O 4.3 16,l 11
24、2,o 76.6 85,O 13,O 69,O 18,7 102,o 5,0 15,9 130,O 88,9 97,O 13,O 81 ,O 18,7 116,O 4,3 1 O0 125 19,l 169,O 115,6 127,O 15,O 1050 22,8 143,O 78 27,4 208,O 142,3 157,O 22,o 128,O 32,3 180,O 11,5 150 200 31,4 246,O 168,3 183,O 26,O 1550 36,O 21 0,o 14,0 35,O 323,O 220,9 243,O 27,O 200,o 42,2 276, O 12,l
25、 Page 6 DIN 2696 : 1999-08 Table 5: Dimensions of series 2 gaskets for PN 100 flanges as in DIN 2637 * 28,O d5 X dl hl 18,O 6,O 11,o 8,4 10 I 7,3 21,O I 14,4 15 I 8,l 31,O I 21,2 27,O I 6,O I 16,O I 9,7 * 12,l 47,O I 32,l 39,O I 6,O I 25,O I 10,8 43,O I 3,8 62,O I 4,3 -I- -I- 100 I 20,4 164,O I 112,
26、2 127,O I 15,O I 98,O I 25,2 143,O I 7,4 203,O 138,9 240,O 164,2 * 180,O I 11,O 157,O 121 ,o 183.0 21 0,o i“ -I- Table 6: Dimensions of series 1 gaskets for PN 160 flanges as in DIN 2638 175 30,6 280,O 1915 218,O 21 ,o 166,O 39,2 243.0 83 200 353 314,O 214,8 243,O 25,O 188,O 44,3 276,O 92 Page 7 DIN
27、 2696 : 1999-08 Table 7: Dimensions of series 2 gaskets for PN 160 flanges as in DIN 2638 DN 10 15 25 40 50 65 80 1 O0 125 150 175 200 7,6 20,o 13,7 18,O I 6,O 21,2 * 55,0 16,0 9,7 28,0 25,0 10,8 43,0 313 1 1 1 38,0 13,9 62,0 I 42 11,3 67,O 458 12,3 86,O 58,8 68,O I 9,0 -I- - -I- * 160,O qz 127,0 -
28、109,4 143,0 11 3,O 180.0 30,l 197,O 134,8 157,O I 22,O 34,8 232,O 158,7 183,O I 26,O Table 8: Dimensions of series 1 gaskets for PN 250 flanges as in DIN 2628 DN 10 15 25 40 50 65 80 1 O0 125 150 175 200 Page 8 DIN 2696 : 1999-08 175 30,9 200 35,8 Table 9: Dimensions of series 2 gaskets for PN 250 f
29、langes as in DIN 2628 279,O 190,8 218,O 21 ,o 164,0 39,9 243,0 83 312.0 213,4 243,O 25,O 185,O 45,3 276,O 9,o DN 10 15 25 40 50 65 80 1 O0 125 150 175 200 Table 10: Dimensions of series 1 gaskets for PN 320 flanges as in DIN 2629 Page 9 DIN 2696 : 1999-08 Designation P245GH Table 11: Dimensions of s
30、eries 2 gaskets for PN 320 flanges as in DIN 2629 Material number As in - EN 10222-2 Table 12: Dimensions of series 1 gaskets for PN 400 flanges as in DIN 2627 X6CrNiMoTi17-12-2 1.4571 DIN EN 10088-1 XGCrNiTil8-10 1.4541 DIN EN 10088-1 I There is no dimension series 2 for PN 400 flanges. 5.3 Materia
31、ls Table 13 lists typical materials used for gaskets. Table 13: Gasket materials) I 1) Use of other materials is subject to agreement. I NOTE: To obtain a greater deformabiliy of gasket facings, gasket materials should have a hardness value lower than that of the flange material. This cannot be ensu
32、red when gaskets and flanges are made from the same material, but experience has shown that even in this case the plastic deformation of the gasket is consid- erably greater than that of the facing. Page 1 O DIN 2696 : 1999-08 5.4 As-delivered condition Gaskets shall have the dimensions specified in
33、 this standard and meet the requirements specified in the relevant material standards. Proof of compliance with the requirements for yield strength, tensile strength and elonga- tion at break shall be furnished by submitting an inspection certificate 3.1 B as in DIN EN 10204. Gaskets shall be packed
34、 so as to prevent any mechanical damage or corrosion of facings during transport. 5.5 Marking Gaskets complying with this standard shall be marked with the following information: a) manufacturer?s mark; b) series designation; c) nominal size; d) PN designation; e) material. EXAMPLE: XXXX/l/DN 50/PN
35、160/P245GH Appendix A Explanatory notes A.l General This standard was revised to improve gasket performance and ensure interchangeability with the gaskets used in existing systems. The gasket diameter has been changed to ensure a better fit with existing flange facings. Flange facing dimensions and
36、dimension x have not been changed, meaning that gaskets complying with this standard are interchangeable with those complying with the previous edition. Since the permissible operating temperatures for gaskets depend on their material and the other service conditions, analysis by calculation is to b
37、e carried out on a case-by-case basis, considering at least the following cases: a) resistance to internal pressure, taking into account the radial component of the gasket force, where necessary; b) resistance to the radial component of the gasket force at elevated temperature, disregarding loading
38、due to internal pressure. A.2 Gasket design In addition to the gasket designs specified in this standard, a further design with spherical facing is found in process engineering (designated as the IG system). Further information will be provided in the relevant works standards. The sealing system des
39、cribed in this standard (where spherical gasket faces are seated on conical flange facings) permits compensation for slight eccentricities of pipe axes, this effect being lessened by bolt flexure (increased basic stress) and differences in bolt/hole diameters. A.3 Other gasket forms In particular ap
40、plications, the calculated spherical radius of gasket faces is smaller than that specified in this standard. Gaskets manufactured on the basis of these calculations seal by means of toroidal zones. Therefore, only slight eccentricities of pipe axes are acceptable. Experience has shown, however, that
41、 these have no adverse effect in practice. Page 11 DIN 2696 : 1999-08 * -. - - Annex B Calculation of gasket dimensions 1 P I - - -. - - - - B.l The values of d, d, and x are the same as those given in the April 1972 edition of this standard. B.2 Determining radius r d; = (di + d,)/2 The radius r is
42、 obtained by rounding t. .e value for r to the nearest integer. d B.3 Determining d, d, = 2 x rx cos 70“ B.4 Determining h, (d5 - dD) h,=x+- tan 70“ Figure B.l: Radius r I II I + Page 12 DIN 2696 : 1999-08 B.5 Determining d, d, is given by rounding the flange diameter di to the nearest integer. B.6
43、Determining h, and h, h, = h, +2 x h,-2 x ha h, = h, + 2 x h,-2 x hc ha = Y - i x h, = r - i x /- hc = r - i x /- & FigureB.3: Dimensions h, and h, Bibliograph y l 1 Tckmantel, H.-J., Die Berechnung der Dichtflachenbreite metallischer Schmiegungsdichtungen (Calculat- ing the width of metallic gaskets), 3R-international35, 1996: 8, pp. 501 -504
