1、ICS 71.120.10Stutzen aus nichtrostendem Stahl, PN 10 bis PN 40In keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.Ref. No. DIN 28025 : 2003-02English price group 08 Sales No. 010802
2、.04DEUTSCHE NORM February 200328025Continued on pages 2 to 6. No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e.V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).PN 10
3、to PN 40 stainless steel nozzles forvessels in process engineering applicationsTranslation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.SupersedesDIN 28025-1 andDIN 28025-2,October 1980 editions.ForewordThis standard has been prep
4、ared by the Normenausschuss Chemischer Apparatebau (Process EngineeringStandards Committee).AmendmentsThis standard differs from DIN 28025-1 and DIN 28025-2, October 1980 editions, in that the standards havebeen combined into one standard, the text of which has been revised in form and substance.Pre
5、vious editionsDIN 28025-1:1980-10; DIN 28025-2: 1980-10.All dimensions are in millimetres.1 ScopeThis standard specifies dimensions of stainless steel nozzles for vessels in process engineeringapplications, for use at nominal pressures of 10 bar to 40 bar and operating temperatures as specified inta
6、ble 1. The dimensions are specified to agree with DIN EN 1092-1.See DIN 28115 for carbon steel nozzles and Explanatory notes for design assumptions.2 Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited
7、 at the appropriate places in the text and the titles of the publications are listedbelow. For dated references, subsequent amendments to or revisions of any of these publications apply tothis standard only when incorporated in it by amendment or revision. For undated references, the latestedition o
8、f the publication referred to applies.DIN 28115 PN 10 to PN 40 carbon steel nozzles for vessels in process engineering applicationsDIN EN 1092-1 Flanges and their joints Circular flanges for pipes, valves, fittings and accessories Part 1: Steel flanges, PN designatedDIN EN 1591-1 Flanges and their j
9、oints Design rules for gasketed circular flange connections Part 1:Calculation methodDIN EN 10204 Inspection documents for metallic products (includes Amendment A1 : 1995)Page 2DIN 28025 : 2003-02DIN EN 29692 Metal-arc welding with covered electrode, gas-shielded metal-arc welding and gaswelding Joi
10、nt preparation for steel (ISO 9692 : 1992)DIN EN ISO 1127 Stainless steel tubes Dimensions, tolerances and conventional masses per unit length(ISO 1127 : 1992)ISO 2768-1:1989 General tolerances Part 1: Tolerances for linear and angular dimensions without individualtolerance indicationsAD-Merkblatt (
11、AD Code of practice) B 08 Flansche (Flanges)AD-Merkbltter, series W1)3 Pressure/temperature ratings, dimensions and designation3.1 Pressure/temperature ratingsNozzles shall have dimensions as specified in table 3.The pressure/temperature ratings given in table 1 are based on the design assumptions m
12、ade in the Explanatorynotes.Table 1: Pressure/temperature ratings1) Obtainable from Beuth Verlag GmbH, Burggrafenstrae 6, 10787 Berlin, Germany.Pressure ratingMaximal allowable pressure1) at an operating temperature, in C, PNequal to ambientup to 150 up to 200temperature10 10 17,5 16,916 16 11,9 11,
13、025 25 18,7 17,240 40 29,9 27,61) Gauge pressure.3.2 DimensionsGeneral tolerances shall be class mk tolerances as in ISO 2768-1 for the nozzle length and for flanges asspecified in DIN EN 1092-1.See DIN EN 1092-1 for information on surface roughness of flanges and flange facings (any other agreement
14、on surface roughness may be made, depending on the service conditions).Table 2: New and old flange facing designationsDesignation as in DIN EN 1092-1 Old designationForm C Form FForm D Form NForm B11) Form C1) For flanges designed for use with nozzles rated for pressures up to 40 bar, type B1 facing
15、s and for thoserated for pressures of 63 bar and higher, type B2 facings shall be used (unless otherwise specified).Page 3DIN 28025 : 2003-023.2.1 Nozzles with type B1 facing3.2.1.1 Type A, with weld-neck flange, for sizes from DN 15 to DN 500Weld preparation as in DIN EN 29692, ref. no. 1.3 or 1.5.
16、Key:1 Weld-neck flange (type 11) as in DIN EN 1092-12 Tube as in DIN EN ISO 1127No specification is made for l, which depends on the vessel design.Figure 1: Nozzle, type A (notation)Page 4DIN 28025 : 2003-023.2.1.2 Type B, with welded-on flange, for sizes from DN 200 to DN 500Key:1 Type 01 flange as
17、 in DIN EN 1092-12 Tube as in DIN EN ISO 11273 Stainless steel sheet metalSingle bevel butt weld Single-J weld (optional)pe(A 2 s) Throat thickness, aUp to 10 000 0,7 sUp to 20 000 1,0 ssrUp to 10 6Above 10 81) For PN 10 and PN 16 nozzles.2) For PN 25 and PN 16 nozzles.3) As a rule, the flange is pr
18、ovided with two M6 test or vent bores, located between the bolt holes. The boresshall be closed with a plug or otherwise closed at the manufacturers discretion. As an alternative to radialvent bores, by agreement, the outer weld may be interrupted once by about 10 mm.Figure 2: Nozzle, type B, with t
19、ype B1 facing (notation)Page 5DIN 28025 : 2003-02Page 6DIN 28025 : 2003-023.2.2 Nozzles with type C and type D facingsFor tongue and groove dimensions, see DIN EN 1092-1. Other dimensions as for type A and B nozzles.Figure 3: Nozzle, type B, with types C and D facings (notation)3.3 DesignationDesign
20、ation of a type A nozzle with type B1 facing (AB1), of size DN 100 (100), made of stainless steel of gradeX6CrNiMoTi17-12-2 (material number 1.4571) and rated for a pressure of 16 bar (PN 16):Nozzle DIN 28025 AB1 100 PN 16 1.4571Designation of a type B nozzle with type C facing (BC), of size DN 250
21、(250), with the flange made of gradeP265GH steel (material number 1.0425) and the tube and the lining made of grade X6CrNiMoTi17-12-2 steel(material number 1.4571), rated for a pressure of 10 bar (PN 10):Nozzle DIN 28025 BC 250 PN 10 1.0425/1.45714 MaterialsProof of the suitability of materials shal
22、l be furnished by producing an inspection document as in DIN EN 10204,with the type of document as specified in the AD-Merkbltter of series W.Explanatory notesIt should be noted that the pressure/temperature ratings in the table are for guidance only. Since the tightnessof flanged joints is vital to
23、 the joint performance and given the inaccuracy involved in bolt tightening, a flangedassembly is to be analysed in each particular case.The design of nozzles as specified in this standard is based on DIN EN 1591-1, assuming the following:a) the internal pressure increases by 10 % in service (if noz
24、zles are exposed to external loads, separateanalysis is to be made);b) the flange thickness values are based on the characteristics of expanded graphite gaskets;c) the rectangularity of flange faces is as specified in AD-Merkblatt B 8;d) the characteristics for flange materials (grades S235JRG2 and
25、X6CrNiMoTi17-12-2; cf. DIN EN 1092-1)are those specified in the relevant AD-Merkbltter of series W;e) the bolts used are of property class 5.6;f) the maximum permissible temperature is utilized;g) the scatter involved in bolt tightening is 30 %.The strength of reinforcement of vessel openings shall be analysed on a case-by-case basis.It should be noted that bolt tightening may cause local plastic deformation which is, however, limited by theassembly relaxing.
