1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1092-2 : 1997 The E
2、uropean Standard EN 1092-2 : 1997 has the status of a British Standard ICS 23.040.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 2. Cast iron flangesBS EN 1092-2 : 199
3、7 This British Standard, having been prepared under the direction of the Sector Board for Engineering, was published under the authority of the Standards Board and comes into effect on 15 September 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference PS
4、E/15 Draft for comment 93/707537 DC ISBN 0 580 27962 6 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PSE/15, Flanges, upon which the following bodies were
5、represented: British Compressed Gases Association British Foundry Association British Iron and Steel Producers Association British Malleable Tube Fittings Association British Plumbing Fittings Manufacturers Association British Pump Manufacturers Association British Valve and Actuator Manufacturers A
6、ssociation Confederation of British Forgers Copper Development Association Energy Industries Council Engineering Equipment and Materials Users Association GAMBICA (BEAMA Ltd.) Power Generation Contractors Association (PGCA (BEAMA Ltd.)BS EN 1092-2 : 1997 BSI 1997 i Contents Page Committees responsib
7、le Inside front cover National foreword ii Foreword 2 Text of EN 1092-2 3ii BSI 1997 BS EN 1092-2 : 1997 National foreword This Part of BS EN 1092 has been prepared by Technical Committee PSE/15, and is the English language version of EN 1092-2 : 1997 Flanges and their joints Circular flanges for pi
8、pes, valves, fittings and accessories, PN designated Part 2: Cast iron flanges, published by the European Committee for Standardization (CEN). It supersedes BS 4504 : Section 3.2 : 1989 which is withdrawn. Cross-references Publication referred to Corresponding British Standard EN 545 : 1994 BS EN 54
9、5 : 1995 Ductile iron pipes, fittings, accessories and their joints for water pipelines. Requirements and test methods EN 1333 : 1996 BS EN 1333 : 1997 Pipework components. Definition and selection of PN EN ISO 6708 : 1995 BS EN ISO 6708 : 1996 Pipework components. Definition and selection of DN (no
10、minal size) EN ISO 9002 : 1994 BS EN ISO 9002 : 1994 Quality systems. Model for quality assurance in production, installation and servicing Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside
11、front cover, pages i and ii, the EN title page, pages 2 to 28, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 All rights of exploitatio
12、n in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 1092-2 : 1997 E EUROPEAN STANDARD EN 1092-2 NORME EUROPE ENNE EUROPA ISCHE NORM April 1997 ICS 23.040.60 Descriptors: Industrial piping, pipe flanges, cast iron, spheroidal graphite cast iron, malleable cast iron
13、, unalloyed cast iron, designation, dimensions, dimensional tolerances, specifications, surface condition, marking English version Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN designated Part 2: Cast iron flanges Brides et leurs assemblages Brides circula
14、ires pour tuyaux, appareil de robinetterie, raccords et accessoires, de signe es PN Partie 2: Brides en fonte Flansche und ihre Verbindungen Runde Flansche fu r Rohre, Armaturen, Formstu cke und Zubeho rteile, nach PN bezeichnet Teil 2: Gubeisenflansche This European Standard was approved by CEN on
15、1996-12-29. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be o
16、btained 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 translation under the responsibility of a CEN member into its own language and notified to the Central S
17、ecretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1092-2 :
18、1997 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 74, Flanges and their joints, the secretariat of which is held by DIN. EN 1092 will consist of the following six Parts: Part 1: Steel flanges Part 2: Cast iron flanges Part 3: Copper alloy flanges Part 4: A
19、luminium alloy flanges Part 5: Flanges in other metallic materials Part 6: Non-metallic flanges This standard is related to ISO 7005-2 : 1988 and ISO 2531 : 1991 in respect of flanges having the same PN designation. The types of flanges and their mating dimensions are compatible with those flanges o
20、f the same DN and PN given in ISO 7005-2 : 1988 and ISO 2531 : 1991. The mating dimensions of the flanges of this standard are compatible with those flanges of other materials in accordance with the other parts of EN 1092. This European Standard shall be given the status of a national standard, eith
21、er by publication of an identical text or by endorsement, at the latest by October 1997, and conflicting national standards shall be withdrawn at the latest by October 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound t
22、o implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative refere
23、nces 3 3 Definitions 3 3.1 flange 3 3.2 DN (Nominal size) 3 3.3 PN 3 3.4 ductile iron 3 3.5 grey iron 3 3.6 malleable iron 3 3.7 joint 3 4 Designation and types 3 4.1 Range of DN 3 4.2 Range of PN designations 5 4.3 Types of flanges 5 4.4 Standard designation 5 4.5 Information to be supplied by the
24、purchaser 5 Page 5 General requirements 5 5.1 Flange material 5 5.2 Repairs by welding 5 5.3 Bolting 5 5.4 Gaskets 5 5.5 Pressure/Temperature (p/T) ratings 5 5.6 Dimensions 6 5.7 Flange facings 6 5.8 Spot facing or back facing 6 5.9 Tolerances 6 5.10 Marking and stamping 6 5.11 Quality assurance 7 A
25、nnex A (normative) Information to be supplied by the purchaser 28 Annex B (informative) Notes to tables 6 to 12 28 Annex C (informative) Bibliography 28 Tables 1 Numerical values of the surface finish parameters (R a and R z ) of flange jointing faces 6 2 Synoptic table for ductile iron flanges 8 3
26、Synoptic table for grey iron flanges 9 4 Synoptic table for malleable iron flanges 10 5 Dimensions for type B flange facings 11 6 Dimensions of PN 2,5 flanges 12 7 Dimensions of PN 6 flanges 14 8 Dimensions of PN 10 flanges 16 9 Dimensions of PN 16 flanges 18 10 Dimensions of PN 25 flanges 20 11 Dim
27、ensions of PN 40 flanges 22 12 Dimensions of PN 63 flanges 24 13 Tolerances on dimensions 25 14 Materials and assigned PN values 26 15 Pressure/temperature ratings for high strength ductile iron flanges 26 16 Pressure/temperature ratings for low strength ductile iron flanges 26 17 Pressure/temperatu
28、re ratings for grey iron flanges 27 18 Pressure/temperature ratings for malleable iron flanges 27 Figures 1 Types of flanges 4 2 Flange facing types A and B 5 3 Dimensions of PN 2,5 flanges 12 4 Dimensions of PN 6 flanges 13 5 Dimensions of PN 10 flanges 15 6 Dimensions of PN 16 flanges 17 7 Dimensi
29、ons of PN 25 flanges 19 8 Dimensions of PN 40 flanges 21 9 Dimensions of PN 63 flanges 23Page 3 EN 1092-2 : 1997 BSI 1997 Introduction The product which is in permanent or temporary contact with water intended for human consumption does not adversely affect the quality of the drinking water and does
30、 not contravene the EC Directives and EFTA Regulations on the quality of drinking water. 1 Scope This standard specifies requirements for circular flanges made from ductile, grey and malleable cast iron for DN 10 to DN 4000 and PN 2,5 to PN 63. (See 4.1 and 4.2). This standard specifies the types of
31、 flanges and their facings, dimensions and tolerances, bolt sizes, surface finish of jointing faces, marking, testing, quality assurance and materials together with associated pressure/temperature (p/T) ratings. 2 Normative references This European Standard incorporates by dated or undated reference
32、, 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 of these publications apply to this European Standard only when incorporated
33、in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 545 Ductile iron pipes, fittings, accessories and their joints for water pipelines Requirements and test methods prEN 1092-1 : 1994 Flanges and their joints Circular flanges for pipes
34、, valves, fittings and accessories, PN designated Part 1: Steel flanges EN 1333 : 1996 Pipework components Definition and selection of PN EN ISO 6708 : 1995 Pipework components Definition and selection of DN (nominal size) (ISO 6708 : 1995) EN ISO 9002 : 1994 Quality systems Model for quality assura
35、nce in production, installations and servicing (ISO 9002 : 1994) ISO 185 : 1988 Classification of grey cast iron ISO 468 : 1982 Surface roughness Parameters, their values and general rules specifying requirements ISO 887 : 1983 Plain washers for metric bolts, screws and nuts General plan ISO 2531 :
36、1991 Ductile iron pipes, fittings and accessories for pressure pipelines ISO 2632-3 : 1979 Roughness comparison specimens ISO 5458 : 1987 Technical drawings Geometrical tolerancing Positional tolerancing ISO 5922 : 1981 Malleable cast iron ISO 7005-2 : 1988 Cast iron flanges 3 Definitions For the pu
37、rposes of this standard, the following definitions apply: 3.1 flange Flat circular end of a pipe component extending perpendicular to its axis, with bolt holes equally spaced on a circle (see figure 1). NOTE. A flange may be fixed (i.e. integrally cast, screwed or welded on) or adjustable; an adjust
38、able flange comprises a ring, in one or several parts assembled together, which bears on an end joint hub and can be freely rotated around the pipe axis before jointing. 3.2 DN (nominal size) See EN ISO 6708 : 1995. NOTE. A numerical designation of size which is common to all components in a piping
39、system. It is a convenient round-number for reference purposes and is only loosely related to manufacturing dimensions. 3.3 PN See EN 1333 : 1996. NOTE. A numerical designation of flanged components which is a convenient round-number for reference purposes. All components of the same nominal size DN
40、 designated by the same PN have compatible mating dimensions. 3.4 ductile iron A cast iron in which graphite is present substantially in spheroidal form. 3.5 grey iron A cast iron in which graphite is present substantially in lamellar form. 3.6 malleable iron A cast iron in which graphite is present
41、 substantially in nodular form (temper carbon), and can be partially or wholly decarburized. 3.7 joint A connection between the flanged ends of piping systems components in which a gasket is used to effect a seal. 4 Designation and types 4.1 Range of DN DN 10 DN 15 DN 20 DN 25 DN 32 DN 40 DN 50 DN 6
42、0 DN 65 DN 80 DN 100 DN 125 DN 150 DN 200 DN 250 DN 300 DN 350 DN 400 DN 450 DN 500 DN 600 DN 700 DN 800 DN 900 DN 1000 DN 1100 DN 1200 DN 1400 DN 1500 DN 1600 DN 1800 DN 2000 DN 2200 DN 2400 DN 2600 DN 2800 DN 3000 DN 3200 DN 3400 DN 3600 DN 3800 DN 4000. The range of DN applicable to each flange t
43、ype and to each PN shall be as specified in tables 2 to 4 as appropriate.Page 4 EN 1092-2 : 1997 BSI 1997 Figure 1. Types of flangesPage 5 EN 1092-2 : 1997 BSI 1997 4.2 Range of PN designations PN 2,5 PN 6 PN 10 PN 16 PN 25 PN 40 PN 63. 4.3 Types of flanges Figure 1 illustrates flanges identified ac
44、cording to type: 05 : blank flange 11 : weld-neck flange 12 : hubbed slip-on flange for welding 13 : hubbed threaded flange 14 : hubbed socket welding flange 16 : adjustable flange 21 : integral flange NOTE. By agreement between customer and manufacturer, an integral flange, modified as follows, can
45、 be supplied: a) bolt hole diameters and flange facing diameter in accordance with prEN 1092-1; b) for ductile iron, flange thickness to be as grey iron flanges. Such flanges shall be designated as type 21-2. Figure 2 illustrates facing types A and B, which are used where applicable in conjunction w
46、ith flanges shown in figure 1 (see 5.7.1). Figure 2. Flange facing types A and B (see table 5 for f and d values of type B) 4.4 Standard designation Flanges conforming to this standard shall be designated as follows: a) term: flange; b) number of this standard: EN 1092-2; c) DN (see 4.1); d) PN (see
47、 4.2); e) number of flange type (see 4.3); f) material type and grade (see 5.1); g) flange facing type for malleable cast iron (see 5.7.1). Example: Designation of a weld-neck flange DN 100, PN 40, type 11, material type MI and grade B30-06 and facing type A: Flange EN 1092-2/DN100/PN40/11/FM B30-06
48、/A 4.5 Information to be supplied by the purchaser The information to be supplied by the purchaser shall be as given in annex A. 5 General requirements 5.1 Flange materials Flanges shall be manufactured from the materials specified in table 14. 5.2 Repairs by welding Where not otherwise prohibited b
49、y the applicable material standard, repairs by welding are permitted when there is a proven method. All welding shall be carried out in accordance with a written procedure. 5.3 Bolting The bolting shall be chosen by the user according to the pressure, temperature, flange material and gasket. For joints comprising at least one grey iron flange it is recommended that bolting having a yield strength not exceeding 240 N/mm 2 s
