EN 1092-1:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flangesBrides et leurs assemblages - Brides circulaires pour tubes, appareils de robinetterie, raccords et accessoires désignées PN - Partie 1: Brides en acierFlansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke und Zubehörteile, nach PN bezeichnet - Teil 1: StahlflanscheTa slovenski standard je istoveten z:EN 1092-1:2007SIST EN 1092-1:2007en,fr23.040.60Prirobnice, oglavki in spojni elementiFlanges, couplings and jointsICS:SLOVENSKI
STANDARDSIST EN 1092-1:200701-november-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1092-1August 2007ICS 23.040.60Supersedes EN 1092-1:2001
English VersionFlanges and their joints - Circular flanges for pipes, valves,fittings and accessories, PN designated - Part 1: Steel flangesBrides et leurs assemblages - Brides circulaires pour tubes,appareils de robinetterie, raccords et accessoires,désignées PN - Partie 1: Brides en acierFlansche und ihre Verbindungen - Runde Flansche fürRohre, Armaturen, Formstücke und Zubehörteile, nach PNbezeichnet - Teil 1: StahlflanscheThis European Standard was approved by CEN on 23 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1092-1:2007: E

Wall thickness and end preparation.66 A.1 Weld-end preparation for flanges types 11 and 34.66 A.2 Weld-end preparation for type 35.69 A.3 Weld end preparation for types 36 and 37.70 Annex B (informative)
Material groups.71 Annex C (informative)
Approximate masses of flanges and collars.73 Annex D (informative)
Additional materials.81 Annex E (normative)
Basis of flange calculation.83 E.1 General.83 E.2 Calculation method.83 E.3 Basic rules for calculation of flange connection.83

Determination of p/t-ratings.86 F.1 General.86 F.1.1 Reference temperature (RT).86 F.1.2 Application limits and equations.86 F.2 Symbols, descriptions and units.86 F.2.1 General.86 F.2.2 p/t-Ratings for materials with time independent nominal design stress.87 F.2.3 p/t-Ratings for materials with time dependent nominal design stress.87 F.2.4 Reference value for thickness (vR).87 F.2.5 Nominal design stresses and safety factors for mean creep rupture strength.87 F.2.6 Flanges made from steel castings.88 F.2.7 Rounding of maximum allowable pressure at temperature.88 Annex G (normative)
p/t-ratings for a selection of EN materials.89 G.1 General.89 G.1.1 p/t-ratings.89 G.1.2 Basics of determination of p/t-ratings (see Annex F).89 G.1.3 Application limits for creep range.89 G.2 Non-austenitic steels.90 G.2.1 General.90 G.2.2 List of materials.91 G.2.3 p/t-Ratings.92 G.3 Austenitic and austenitic-ferritic steels.104 G.3.1 General.104 G.3.2 List of materials.104 G.3.3 p/t-Ratings.105 Annex H (informative)
Rings for tongue and groove flanges.112 Annex I (informative)
Flanges with fixed inner diameter.113 I.1 General.113 I.2 Scope.113 Annex J (informative)
Mating dimensions for flanges with higher DN.116 Annex ZA (normative)
Relationship between this European Standard and the Essential Requirements of Directive 97/23/EC.118 Bibliography.120

4 Designation 4.1 General Table 6 specifies the flange types and collar types. Figures 1 and 2 show flange types and collar types with the relevant flange type numbers. Flanges shall be
denoted with "flange type" and the "flange description". Collar components shall be denoted with collar type and the collar description. Figure 3 shows flange facing types, which may be used with the flanges or components shown in Figures 1 and 2. Flange facings shall be denoted with "type" and the relevant symbol. The range of DN, applicable to each flange type and collar and to each PN, shall be as given in Table 7, however not all dimensions are existing for each type. 4.2 Standard designation Flanges and collars in accordance with this standard shall be designated with the following: a) designation, e.g. flange, lapped end or collar; b) number of this European Standard, i.e. EN 1092-1; c) number of flange type or collar type in accordance with Figures 1 and 2; d) type of flange facing in accordance with Figure 3; e) DN (nominal size); f) bore diameter only if not according to this standard (for sizes greater than DN 600); B1 (only for types 01, 12 and 32); B2 (only for type 02); B3 (only for type 04); g) wall thickness S only if not according to this European Standard (only for types 11 and 34, 35, 36 and 37); h) bevelled wall thickness Sp if required (only for types 11 and 34 to 37, see Annex A); i) PN designation; j) for type 13 flanges type of thread (Rp or Rc); k) and material and material standard (if necessary); l) any heat treatment required;

Flange EN 1092-1/11/B2/DN 200 × 9/PN 100/P245GH EXAMPLE 2 Designation of a flange type 01 of nominal size DN 800, with bore diameter B1 = 818 mm, PN 6, made of mate-rial P265GH:
Flange EN 1092-1/01/DN 800/818/PN 6/P265GH EXAMPLE 3 Designation of a collar type 32 of nominal size DN 400, PN 10 and made of material P265GH:
Collar EN 1092-1/32/DN 400/PN 10/P265GH EXAMPLE 4 Designation of a flange type 02 of nominal size DN 400, PN 10 and made of material 1.0425:
Flange EN 1092-1/02/DN 400/PN 10/1.0425
5 General requirements 5.1 Materials 5.1.1 General Flanges and collars to be used in pressure equipment shall be manufactured from materials fulfilling the essential safety requirements of the Directive 97/23/EC. Materials specifications which meet the requirements for this European Standard are given in Table 9 (see also Annex D). Collars type 35 to 37 shall only be manufactured of austenitic/austenitic ferritic steel. The fabricated flange shall fulfil the mechanical properties of the material standard. WARNING — The restrictions of the different material standards have to be followed. NOTE 1 The materials given in Table 9 (see also Annex D) are tabulated in groups. NOTE 2 The materials of ancillary components (for example rings according to Annex H) are not within the scope of this European Standard. 5.1.2 Methods of manufacture related to base material Methods of manufacture see Table 1.

electric welded form bars, sec-tional steel or strip b, c, d, e Pressed from welded or seamless pipes or flat products 01
(Plate flange for welding) yes no yes yes yes no 02
(Loose plate flange for Types 32—37) yes no yes yes yes no 04
(Loose plate flange for Type 34) yes no yes yes yes no 05
(Blind flange) yes no yes yes no no 11
(Weld-neck flange) yes no no yes yes, for
≥ DN 700 no 12
(Hubbed slip-on flange for welding) yes no no yes no no 13
(Hubbed threaded flange) yes no no yes no no 21
(Integral flange) yes yes no yes no no 32
(Weld-on plate collar) yes no yes yes yes no 33
(Lapped end pipe) yes no yes yes yes yes 34
(Weld-neck collar) yes yes no yes yes no 35
(Welding neck) yes no
yes yes yes no 36
(Pressed collar with long neck) yes no no no yes yes 37
(Pressed collar) yes no yes no yes yes a Seamless rolled, pressed, forged. b Only one radial weld is allowed under DN 1800. c For welding see 5.11. d Welded flanges allowed only for an application up to 370 °C in conformance with EN 13480-3:2002, D.4.4. e In case flanges are made by cold forming of a base material e.g. flat product, some mechanical properties, like elongation after fracture (A) and impact energy (KV), will be impaired due to cold forming without subsequently heat treatment.
5.2 Repairs by welding With the exception of weld repairs according to 5.11 repairs by welding are permitted only by written agreement of the purchaser. Within the certificate for material or component relevant documents shall be noted, that approved welding proce-dure and welders qualification (see 5.11) have been applied. 5.3 Bolting Flanges shall be suitable for use with the number and size of bolting as specified in Tables 10 to 21. The bolting shall be chosen by the equipment manufacturer according to the pressure, temperature, flange material and gasket so that the flanged joint remains tight under the expected operating conditions. For selection of bolting, see EN 1515-1, for combination of the materials of flanges and bolting see EN 1515-2, for information. 5.4 Gaskets The various gasket types, dimensions, design characteristics and materials used are not within the scope of this European Standard. Dimensions of gaskets are given in the series of standards EN 1514. 5.5 Determination of p/t ratings p/t ratings for flanges according to this standard shall be calculated in accordance with the rules given in Annex F.

50 B2 b, C, D, G, H Turning c — 0,8
3,2
3,2
12,5 NOTE For certain applications, e.g. low temperature gases, it may be necessary to stipulate closer control to the surface finish. a Ra and Rz are defined in EN ISO 4287. b Types B1 and B2 are raised face (type B) flanges with different specified surface roughness values.
B1 : Standard facing for all PN numbers.
B2 : Only if agreed between the purchaser and the flange manufacturer. c The term 'turning' includes any method of machine operation producing either serrated concentric or serrated spiral grooves.
5.8 Surface finish of flanges and collars 5.8.1 Surface finish The surface finish of flanges and collars shall be according to Table 3. The given surface roughness values apply to as-delivered condition, unless otherwise specified by the purchaser.

b c 02 (Loose plate flange for Types 32—37) 25
b
04 (Loose plate flange for Type 34) 25
b
05 (Blind flange) 25
n.a. b c 11 (Weld-neck flange) 25 a 160 a 25 a 160 a b c 12 (Hubbed slip-on flange for welding) 25 a 160 a 25 a 160 a b c 13 (Hubbed threaded flange) 25 a 160 a See thread standard b c 21 (Integral flange) 25 a 160 a 25 a 160 a
c 32 (Weld-on plate collar) 25
33 (Lapped end pipe) 25
34 (Weld-neck collar) 25 a 160 a 25 a 160 a
35 (Weldring neck) 25 a 160 a 25 a 160 a
36 (Pressed collar with long neck) 25 a 160 a 25 a 160 a
37 (Pressed collar) 25 a 160 a 25 a 160 a
a Or up to PN 40 un-machined. b Bolt holes > PN 40 only drilled. c Chip machining spot facing for PN ≥ 63 (see 5.8.2).
5.8.2 Spot facing or back facing of flanges Any spot facing or back facing shall not reduce the flange thickness to less than the flange thickness specified. When spot facing is used, the diameter shall be large enough to accommodate the outside diameter of the equiva-lent normal series of washers in accordance with EN ISO 887 for the bolt size being fitted. The bearing surfaces for the bolting shall be parallel to the flange face within the limits given in Table 22. When a flange is back faced a minimum fillet radius, R2 (see Figure 17) in accordance with Table 23 shall be maintained. 5.9 Tolerances Tolerances on dimensions of flanges and collars shall be as given in Table 22. General tolerances for dimensions without given tolerance: According to ISO 2768-1 — c. 5.10 Marking 5.10.1 General marking requirements All flanges, lapped ends and collars, other than type 21 flanges, should be marked as follows: a) flange/collar manufacturer’s name or trade mark, e.g. XXX; b) number of this European Standard, i.e. EN 1092-1; c) flange/collar type number; d) DN, e.g. DN 150; e) PN designation, e.g. PN 40 (marking according to synoptic Table 7, other marking with lower PN number, for identical dimensions only, may be specified);
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