oSIST prEN 1092-3:2022
(Main)Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 3: Copper alloy flanges
Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 3: Copper alloy flanges
This document specifies requirements for circular copper alloy flanges and copper alloy collars combined with loose steel plate flanges in PN designations from PN 6 to PN 40 and nominal sizes from DN 10 to DN 1800 in the types shown in Table 1.
This document also specifies dimensions and tolerances, materials and their associated pressure/temperature (p/T) ratings, flange facings and related surface finish, weld repairs, and marking, together with information on bolting, gaskets, application/installation and approximate flange masses.
The flanges specified, with the exception of integral (type 21) flanges, are for attachment to copper or copper alloy tubes in accordance with EN 12449.
NOTE 1 When the flanges specified in this document are required for use with copper or copper alloy tubes to EN 1057 in those tube diameters which are different to EN 12449, this should be agreed between the equipment manufacturer and the flange manufacturer.
NOTE 2 The size of copper and copper alloy tubes is designated by reference to the outside diameter in millimetres.
NOTE 3 See also Annex B.
NOTE 4 Non-gasketed pipe joints are outside the scope of this document.
Table 1 - Types of flanges and collars
[...table not represented...]
Flansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke und Zubehörteile, nach PN bezeichnet - Teil 3: Flansche aus Kupferlegierungen
Dieses Dokument legt Anforderungen fest für runde Flansche aus Kupferlegierungen und glatte Losflansche aus Stahl kombiniert mit Bunden aus Kupferlegierungen mit den PN Stufen PN 6 bis PN 40 und den Nennweiten DN 10 bis DN 1 800 der Typen nach Tabelle 1.
Dieses Dokument legt auch Maße und Toleranzen, Werkstoffe und zugehörige Druck/Temperatur-Zuordnungen, Flanschdichtflächen und deren Oberflächenbeschaffenheit, Reparatur durch Schweißen, Kennzeichnung und Qualitätssicherung fest und enthält Angaben zu Schrauben und Muttern, Dichtungen, Anwendung, Montage und ungefähre Flanschgewichte.
Die festgelegten Flansche, ausgenommen Integralflansche (Typ 21), werden zur Befestigung an Rohren aus Kupfer oder Kupferlegierungen nach EN 12449 verwendet.
ANMERKUNG 1 Werden Flansche nach diesem Dokument für die Verwendung mit Rohren aus Kupfer oder Kupferlegierungen nach EN 1057 für andere als die in EN 12449 festgelegten Rohrdurchmesser gefordert, so sollte dies zwischen dem Rohrleitungshersteller und dem Hersteller der Flansche vereinbart werden.
ANMERKUNG 2 Die Größe von Rohren aus Kupfer und Kupferlegierungen wird durch Angabe des Außendurchmessers in Millimeter bezeichnet.
ANMERKUNG 3 Siehe auch Anhang B.
ANMERKUNG 4 Rohrleitungsverbindungen ohne Dichtung liegen nicht im Anwendungsbereich dieses Dokuments.
Tabelle 1 - Typen von Flanschen und Bunden
[...]
Bild 1 - Typen der Flansche und Bunde
Brides et leurs assemblages - Brides circulaires pour tubes, appareils de robinetterie, raccords et accessoires, désignées PN - Partie 3 : Brides en alliages de cuivre
Le présent document spécifie les prescriptions des brides circulaires en alliages de cuivre et des collets en alliage de cuivre combinés avec des brides plates tournantes en acier pour les désignations PN de PN 6 à PN 40 et pour les diamètres nominaux de DN 10 à DN 1800 pour les types de brides et de collets présentés au Tableau 1.
Le présent document spécifie aussi les dimensions et tolérances, les matériaux associés à leurs relations pression/température (p/T), les portées de joints et leur état de surface, les réparations par soudage et le marquage, avec les informations sur la boulonnerie, les joints, leur application et installation ainsi que les masses approximatives des brides.
Les brides spécifiées, à l'exception des brides incorporées (type 21), sont à monter sur des tubes en cuivre ou en alliage de cuivre conformément à l’EN 12449.
NOTE 1 Lorsque les brides spécifiées dans le présent document sont prescrites pour l'utilisation avec des tubes en cuivre ou en alliage de cuivre selon l'EN 1057, lesquels ont des diamètres différents de l’EN 12449, il convient qu’un accord entre le fabricant d’équipement et le fabricant de brides soit établi.
NOTE 2 Les dimensions des tubes de cuivre ou d'alliage de cuivre sont désignées par le diamètre extérieur en millimètres.
NOTE 3 Voir aussi l’Annexe B.
NOTE 4 Les raccordements sans joint de tuyauteries sont en dehors du domaine d’application du présent document.
Tableau 1 - Types de brides et de collets
[...]
Figure 1 - Types de brides et de collets
Prirobnice in prirobnični spoji - Okrogle prirobnice za cevi, ventile, fitinge in pribor z oznako PN - 3. del: Prirobnice iz bakrovih zlitin
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 1092-3:2022
01-januar-2022
Prirobnice in prirobnični spoji - Okrogle prirobnice za cevi, ventile, fitinge in pribor
z oznako PN - 3. del: Prirobnice iz bakrovih zlitin
Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN
designated - Part 3: Copper alloy flanges
Flansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke
und Zubehörteile, nach PN bezeichnet - Teil 3: Flansche aus Kupferlegierungen
Brides et leurs assemblages - Brides circulaires pour tubes, appareils de robinetterie,
raccords et accessoires, désignées PN - Partie 3 : Brides en alliages de cuivre
Ta slovenski standard je istoveten z: prEN 1092-3
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
77.150.30 Bakreni izdelki Copper products
oSIST prEN 1092-3:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 1092-3:2022
DRAFT
EUROPEAN STANDARD
prEN 1092-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2021
ICS 23.040.60 Will supersede EN 1092-3:2003
English Version
Flanges and their joints - Circular flanges for pipes, valves,
fittings and accessories, PN designated - Part 3: Copper
alloy flanges
Brides et leurs assemblages - Brides circulaires pour Flansche und ihre Verbindungen - Runde Flansche für
tubes, appareils de robinetterie, raccords et Rohre, Armaturen, Formstücke und Zubehörteile, nach
accessoires, désignées PN - Partie 3 : Brides en alliages PN bezeichnet - Teil 3: Flansche aus Kupferlegierungen
de cuivre
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 74.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1092-3:2021 E
worldwide for CEN national Members.
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prEN 1092-3:2021 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 7
3 Terms and definitions . 7
4 Designation . 8
4.1 General. 8
4.2 Standard designation . 8
4.3 Information to be supplied by the equipment manufacturer . 9
5 General requirements . 9
5.1 Materials . 9
5.2 Repairs . 9
5.3 Bolting . 9
5.4 Gaskets . 10
5.5 Pressure/temperature (p/T) ratings . 10
5.5.1 General. 10
5.5.2 p/T ratings of flanged joints . 10
5.6 Dimensions. 10
5.6.1 Flanges . 10
5.6.2 Bolt holes . 11
5.7 Flange facings . 11
5.7.1 Types of facings . 11
5.7.2 Jointing face finish . 11
5.7.3 Rims . 12
5.7.4 Collars and loose flanges . 12
5.8 Spot facing or back facing . 12
5.9 Tolerances . 12
5.10 Marking . 12
5.10.1 Other than type 21 flanges . 12
5.10.2 Method of markings . 13
5.10.3 Omission of markings . 13
5.10.4 Declaration of compliance . 13
Annex A (informative) Information to be supplied by the equipment manufacturer . 45
Annex B (informative) Application and installation . 46
Annex C (informative) Approximate masses of flanges and collars . 47
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive 2014/68/EU aimed to be covered . 52
Bibliography . 54
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European foreword
This document (prEN 1092-3:2021) has been prepared by Technical Committee CEN/TC 74 “Flanges
and their joints” the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1092-3:2003 and EN 1092-3:2003/AC:2007.
The main changes compared to EN 1092-3:2003 and EN 1092-3:2003/AC:2007 are:
— update of Annex ZA.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s) [the Pressure
1
Equipment Directive (PED)] .
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
EN 1092 consists of the following parts:
— Part 1: Steel flanges
— Part 2: Cast iron flanges
— Part 3: Copper alloy flanges
— Part 4: Aluminium alloy flanges
The Annex A, Annex B, Annex C and Annex ZA are informative.
1
Directive 97/23 EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the
Laws of the Member States concerning pressure equipment; OIEC L 181.
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Introduction
This standard is related to ISO 7005-3 in respect of flanges having the same PN. The types of flanges and
their mating dimensions are identical with those flanges of the same DN and PN given in ISO 7005-3,
except that certain flange types in accordance with this standard may regularly be supplied with raised
face facings.
The mating dimensions of the flanges of this standard are compatible with PN designated flanges of
other materials in accordance with the other parts of EN 1092.
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1 Scope
This document specifies requirements for circular copper alloy flanges and copper alloy collars
combined with loose steel plate flanges in PN designations from PN 6 to PN 40 and nominal sizes from
DN 10 to DN 1800 in the types shown in Table 1.
This document also specifies dimensions and tolerances, materials and their associated
pressure/temperature (p/T) ratings, flange facings and related surface finish, weld repairs, and
marking, together with information on bolting, gaskets, application/installation and approximate flange
masses.
The flanges specified, with the exception of integral (type 21) flanges, are for attachment to copper or
copper alloy tubes in accordance with EN 12449.
NOTE 1 When the flanges specified in this document are required for use with copper or copper alloy tubes to
EN 1057 in those tube diameters which are different to EN 12449, this should be agreed between the equipment
manufacturer and the flange manufacturer.
NOTE 2 The size of copper and copper alloy tubes is designated by reference to the outside diameter in
millimetres.
NOTE 3 See also Annex B.
NOTE 4 Non-gasketed pipe joints are outside the scope of this document.
Table 1 — Types of flanges and collars
Type no. Description
01 Plate flange in copper alloy for brazing or welding
02 Loose plate flange in steel with a plate collar (type 32) in copper alloy, for brazing or
welding.
04 Loose plate flange in steel with a weld-neck collar (type 34) in copper alloy, for welding.
05 Blank flange in copper alloy.
05C Blank flange in steel clad with a copper alloy jointing face.
07 Loose plate flange in steel with a slip-on collar (type 37) in copper alloy, for soft soldering,
brazing or welding.
11 Weld-neck flange in copper alloy for welding.
12 Hubbed slip-on flange in copper alloy, for soft soldering, brazing or welding.
14 Hubbed slip-on flange in copper alloy supplied with tube stops, for soft soldering, brazing
or welding.
21 Integral flange in copper alloy as part of some other equipment or component
32 Plate collar in copper alloy
34 Weld-neck collar in copper alloy.
37 Slip-on collar in copper alloy.
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Type 01 Type 02, 32 Type 04, 34
Plate flange in copper alloy for Loose plate flange in steel with a Loose plate flange in steel with a
brazing or welding plate collar (type 32) in copper weld-neck collar (type 34) in
alloy for brazing and welding copper alloy for welding
Type 05, 05C Type 07, 37 Type 11
05 Blank flange in copper alloy Loose plate flange in steel with a Weld-neck flange in copper alloy
05C Blank flange in steel clad slip-on collar (type 37) in copper for welding
with a copper alloy jointing face alloy, for soft soldering, brazing
or welding
Type 12 Type 14 Type 21
Hubbed slip-on flange in copper Hubbed slip-on flange in copper Integral flange in copper alloy as
alloy, for soft soldering, brazing alloy supplied with tube stops, part of some other equipment or
or welding for soft soldering, brazing or component
welding
Key
Copper alloy component
Steel component
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Figure 1 — Types of flanges and collars
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1333:2006, Flanges and their joints — Pipework components — Definition and selection of PN
EN 1652, Copper and copper alloys — Plate, sheet, strip and circles for general purposes
EN 1982, Copper and copper alloys — Ingots and castings
EN 10028-2, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with
specified elevated temperature properties
EN 10222-2, Steel forgings for pressure purposes — Part 2: Ferritic and martensitic steels with specified
elevated temperature properties
EN 12420, Copper and copper alloys — Forgings
EN 12449+A1, Copper and copper alloys — Seamless, round tubes for general purposes
EN ISO 887, Plain washers for metric bolts, screws and nuts for general purposes — General plan
(ISO 887)
EN ISO 4287, Geometrical product specification (GPS) — Surface texture: Profile method — Terms,
definitions and surface texture parameters (ISO 4287)
EN ISO 6708:1995, Pipework components — Definition and selection of DN (nominal size)
(ISO 6708:1995)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
DN
see EN ISO 6708:1995
3.2
PN
see EN 1333:2006
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3.3
maximum allowable pressure
PS
means the maximum allowable pressure for which the equipment is designed, as specified by the
equipment manufacturer
3.4
maximum allowable temperature
TS
means the maximum allowable temperature for which the equipment is designed, as specified by the
equipment manufacturer
4 Designation
4.1 General
The types of flanges and their reference numbers are given in Table 1 and the range of DN applicable to
each flange type and to each PN shall be as given in Table 3.
4.2 Standard designation
Flanges and collars in accordance with this document shall be designated by the following:
a) designation, e.g. flange or collar;
b) number of this standard, EN 1092-3;
c) number of flange type in accordance with Figure 1;
d) type of flange facing, A or B in accordance with Figure 1 (only for types 11, 12, 14 and 21);
e) PN designation, PN …;
f) nominal size, DN …;
g) bore diameter B (only for flanges which can be made to suit more than one tube diameter – see
1
Table 5 to Table 9);
h) material number or symbol (see Table 11 and Table 12) (for type 05C flanges it is necessary to
specify both the material of the flange and the material of the cladding).
EXAMPLE 1 Designation of a plate flange type 01 with facing type A, in PN 6 and nominal size DN 800 and in
material symbol CuAl8Fe3:
Flange EN 1092-3/01A/PN 6/DN 800/CW303G
EXAMPLE 2 Designation of a loose flange type 07, in PN 10 and nominal size DN 50 and in material symbol
S235JR:
Flange EN 1092-3/07/PN 10/DN 50/S235JR
EXAMPLE 3 Designation of slip-on collar type 37, in PN 10 and nominal size DN 50 with bore diameter
B = 57,23 and in material symbol CuZn20Al2As:
1
Collar EN 1092-3/37/PN 10/DN 50/57,23/CW702R
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EXAMPLE 4 Designation of a blank flange type 05C with clad jointing face, in PN 25 and nominal size DN 150
and in materials symbols S235JR (for blank flange) and CuNi30Mn1Fe (for cladding):
Flange EN 1092-3/05C/PN 25/DN 150/S235JR-CW354H
EXAMPLE 5 Designation of a weld-neck flange type 11 with facing type B, in PN 16 and nominal size DN 100
and in material symbol CuAl10Fe2-C:
Flange EN 1092-3/11B/PN 16/DN 100/CC331G
4.3 Information to be supplied by the equipment manufacturer
For information to be supplied by the equipment manufacturer see Annex A.
5 General requirements
5.1 Materials
Flanges and collars shall be manufactured from the materials specified in Table 11 and Table 12 except
for type 21 flanges where the flange manufacturer may use other materials by agreement with the
equipment manufacturer.
The flange manufacturer shall provide means of identifying the material of the flange. An equipment
manufacturer may require a certificate in accordance with EN 10204 which is suitable for the category
of the equipment to which the flange is fitted.
NOTE If a protective coating such as zinc coating or zinc painting is required on steel components, the
equipment manufacturer should state this on the enquiry and/or order.
5.2 Repairs
5.2.1 Repairs by welding are permitted when there is a proven method and where not otherwise
prohibited by the applicable material standard. All welding shall be carried out in accordance with a
written procedure.
NOTE For approval of welding procedures, see EN 288-1. For approval of welders, see EN 287-1.
5.2.2 Any filler rod used for weld repairs shall be such as to produce a weld having characteristics at
least equal to the parent metal. Flanges shall be heat treated after repair welding when the material
standard requires such treatment.
5.3 Bolting
Flanges shall be suitable for use with the nominal size and number of bolts specified in Table 5 to
Table 9 as appropriate.
The bolting material shall be chosen by the equipment manufacturer according to the pressure,
temperature, flange material and the selected gasket so that the flanged joint remains tight under the
expected operating conditions.
NOTE 1 For information on bolting, see EN 1515-1 and EN 1515-2 and Annex B.
NOTE 2 For flange types 01, 05, 11, 12, 14 and 21, where copper alloy bolting is used, the recommended
bolting materials are EN 12420 Alloy Nos. CW306G or CW307G for temperatures up to and including 120 °C.
For flange types 02, 04, 05C and 07, steel bolting should be used and reference should be made to
EN 1515.
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5.4 Gaskets
The various gasket types, dimensions, design characteristics and materials used are not within the
scope of this standard. Dimensions of gaskets are given in the relevant parts of EN 1514.
5.5 Pressure/temperature (p/T) ratings
5.5.1 General
The p/T ratings of the flanges manufactured from the materials specified in Table 11 and Table 12 are
given in Table 13 and Table 14.
The p/T ratings indicate the relationship between the maximum allowable pressure, PS and the
maximum allowable temperature, TS.
Linear interpolation is permitted for intermediate temperatures.
NOTE 1 See EN 764 for terminology.
NOTE 2 When type 21 flanges are supplied as part of another component (for example, a valve or pump) in a
material other than those listed in Table 11, reference should be made to the relevant product or application
standard for the appropriate p/T ratings.
NOTE 3 The rating of a flange is not necessarily the rating of the whole pipework system. Gasket materials can
also impose limitation of the p/T rating of a flanged joint and the gasket manufacturer should be consulted when
selecting the material of the gasket.
5.5.2 p/T ratings of flanged joints
When two flanges in a flanged joint do not have the same p/T rating at any temperature, then the lower
of the two flange p/T ratings at that temperature shall apply.
NOTE 1 For any p/T rating, the temperature shown is considered to be the same as that of the contained fluid.
Use at a pressure corresponding to a temperature other than that of the contained fluid is the responsibility of the
user.
NOTE 2 Application of the p/T ratings given in this standard to flange joints should take into consideration the
risks of leakage due to forces and moments developed in the connecting pipework, see Annex B.
NOTE 3 These notes on service considerations are not intended to be exhaustive.
5.6 Dimensions
5.6.1 Flanges
Dimensions of flanges shall be in accordance with Figure 2 and the following tables and figures as
appropriate:
— PN 6 flanges: Table 5 and Figure 3;
— PN 10 flanges: Table 6 and Figure 4;
— PN 16 flanges: Table 7 and Figure 5;
— PN 25 flanges: Table 8 and Figure 6;
— PN 40 flanges: Table 9 and Figure 7.
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NOTE 1 The bore sizes of type 21 flanges are usually equal to the nominal size of the pipe, valve or fitting of
which they form a part and the actual bore sizes are usually given in the appropriate standard(s) for the pipe,
valve or fitting.
NOTE 2 When type 07, 12 and 14 flanges are for use with soft soldering techniques only, then reference should
be made to EN 1254-1 for socket depths.
NOTE 3 For types 34 and 11 flanges the recommended weld preparation angle is 37,5° ± 2,5° when butt
welding to pipe with thickness of 3 mm and greater.
5.6.2 Bolt holes
Bolt holes shall be equally spaced on the pitch circle diameter. In the case of type 21 flanges, the bolt
holes shall be positioned such that they are symmetrical to the principle axes and such that no holes fall
on these axes, i.e. positioned “off-centre”, see Figure 3 to Figure 7.
5.7 Flange facings
5.7.1 Types of facings
Figure 2 illustrates facing types (types A and B) which are used, where applicable, in conjunction with
the flanges shown in Figure 1. Diameters of type B raised faces are given in Table 4.
Types 01 and 05 flanges in copper alloy shall be provided with type A flat face. Types 11, 12, 14 and 21
flanges in copper alloy shall be provided with either type A flat face or type B raised face.
NOTE 1 Flanges with type A facings are suitable for bolting to flat face mating flanges using a full face gasket.
Flanges with type B facings are suitable for bolting to raised face mating flanges and/or used with inside bolt
circle gaskets.
NOTE 2 For types 11, 12, 14 and 21 flanges, the equipment manufacturer’s enquiry or order should advise the
flange manufacturer of the facing type required, see Annex A.
NOTE 3 For certain large size flanges in types 11, 12 and 14 and PN 6 to PN 25 (see Table 5 to Table 8), type B
facings only are specified. The provision of type A facings on these flanges would be by agreement between the
flange manufacturer and equipment manufacturer.
Types 02, 04, 05C and 07 flanges have a raised face formed by the face of the collar or the cladding, for
bolting to raised face mating flanges using an inside bolt circle gasket.
NOTE 4 The bolting of these flanges to a flat face iron or steel mating flange using full face or inside bolt circle
gaskets is not precluded.
5.7.2 Jointing face finish
All flange jointing faces shall be machine finished and when compared by visual or tactile means with
reference specimens, shall be in accordance with Table 2.
NOTE 1 It is not intended that instrument measurements are taken on the flange faces, and the R and R
a z
values as defined in ISO 468 relate to the reference specimens.
NOTE 2 Other finishes may be agreed between the flange manufacturer and equipment manufacturer.
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Table 2 — Surface finish of jointing faces
a a
R R
a z
Method of
μm μm
machining
min. max. min. max.
b 3,2 12,5 12,5 50m
Turning
Machining processes other than turning are permissible provided that they give a surface finish in
accordance with the R and R values specified.
a z
a
R and R are defined in EN ISO 4287.
a z
b
Turning covers any method of machining operation producing either serrated concentric or serrated
spiralgrooves.
5.7.3 Rims
Rims of flanges and collars may be machined or un-machined.
5.7.4 Collars and loose flanges
Collars and loose flanges shall be machine finished, or have a surface equivalent to that obtained by
machining on all locating diameters, bores and abutment faces. The abutment faces shall be flat and
square to the bore axis.
5.8 Spot facing or back facing
Any spot facing or back facing required shall not reduce the flange thickness to less than the minimum
specified.
When spot facing is used, the diameter shall be large enough to accommodate the outside diameter of
the equivalent normal series of washers in accordance with EN ISO 887 for the bolt size being fitted.
When a flange is back faced, it is permissible for the fillet radius to be reduced but it shall not be
eliminated entirely. The bearing surfaces for the bolting shall be parallel to the flange jointing face
within the limits given in Table 10.
5.9 Tolerances
Tolerances on dimensions shall be as specified in Table 10.
5.10 Marking
5.10.1 Other than type 21 flanges
All flanges and collars shall be marked as follows:
a) Number of this standard, i.e. EN 1092-3;
b) Flange or collar type number, e.g. 05;
c) PN designation, e.g. PN 10;
d) DN (Nominal size), e.g. DN 100. Where a flange or collar can be made to suit more than one tube
size, the tube size shall be marked as appropriate (see Table 5 to Table 9);
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e) Material designation. The alloy designation number given in Table 11 and Table 12 shall be used, as
appropriate;
f) Flange manufacturer’s name or trademark.
EXAMPLE 1 Copper alloy flanges:
EN 1092-3 — 12 — PN 16 — DN 300 — CW352H — XYZ
EXAMPLE 2 Copper alloy collars:
EN 1092-3 — 32 — PN 16 — DN 50/54 — CC491K — XYZ
EXAMPLE 3 Steel components:
EN 1092-3 — 02 — PN 16 — DN 300 — S235JR — XYZ
5.10.2 Method of markings
Copper alloy flanges shall be clearly and permanently marked by a method other than stamping with
steel stamps.
NOTE 1 The flange manufacturer’s name or trademark, together with other relevant markings may be
produced during casting or forging for both copper alloy and steel components.
NOTE 2 Steel flanges may be marked round the rim of the flange with round nosed steel stamps.
5.10.3 Omission of markings
If a flange is too small to enable all the markings required in 5.10.1 to be marked on the flange, then
some of the markings are permitted to be omitted. The order in which the markings are omitted shall be
as follows:
a) Flange type number;
b) DN.
5.10.4 Declaration of compliance
The marking EN 1092-3, together with the flange manufacturer’s name or trademark on or in relation
to a product, represents a
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