Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 2: Cast iron flanges

This document 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 100. See 4.1 and 4.2 for information regarding allowed DN and PN.
This document specifies the types of flanges and their facings, dimension and tolerances, bolt sizes, surface finish of jointing faces, marking, testing, quality assurance and materials together with associated pressure/temperature (p/T) ratings.

Flansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke und Zubehörteile, nach PN bezeichnet - Teil 2: Gußeisenflansche

Dieses Dokument legt die Anforderungen an runde Flansche aus duktilem Gusseisen, und aus Temperguss von DN 10 bis DN 4 000 und PN 2,5 bis PN 100 fest. Siehe 4.1 und 4.2 für Informationen über zulässige DN und PN.
Dieses Dokument legt die Flanschtypen und ihre Dichtflächen, Maße, Toleranzen, Schraubengrößen, Oberflächenbeschaffenheit der Dichtflächen, Kennzeichnung, Prüfung, Qualitätssicherung und Werkstoffe zusammen mit den zugehörigen Druck/Temperatur-Zuordnungen fest.

Brides et leurs assemblages - Brides circulaires pour tuyaux, appareils de robinetterie, raccords et accessoires, désignées PN - Partie 2 : Brides en fonte

Le présent document spécifie les prescriptions pour les brides circulaires en fonte ductile, grise et malléable pour DN 10 à DN 4000 et PN 2,5 à PN 100. Voir 4.1 et 4.2 pour les informations concernant les DN et PN autorisés.
Le présent document spécifie les types de brides et leurs portées de joints, les dimensions et tolérances, les dimensions de boulonnerie, les états de surface des portées de joints, le marquage, les essais, l’assurance qualité et les matériaux ainsi que les relations pression/température (p/T) associées.

Prirobnice in prirobnični spoji - Okrogle prirobnice za cevi, ventile, fitinge in pribor z oznako PN - 2. del: Prirobnice iz litega železa

Ta standard določa zahteve za okrogle prirobnice, izdelane iz sive in temprane železove litine za oznake DN 10 do DN 4000 in PN 2,5 do PN 100 (glej točki 4.1 in 4.2 za informacije o dovoljenih oznakah DN, PN in kombinacije DN-PN).
Ta standard določa vrste prirobnic in njihovih prevlek, mere in tolerance, velikosti vijakov, površinske premaze prirobničnih spojev, označevanje, preskušanje, zagotavljanje kakovosti in materiale skupaj s povezanimi vrednostmi tlaka/temperature (p/T).

General Information

Status
Published
Publication Date
28-Nov-2023
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
29-Nov-2023
Due Date
25-Sep-2023
Completion Date
29-Nov-2023

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SLOVENSKI STANDARD
01-februar-2024
Nadomešča:
SIST EN 1092-2:1998
Prirobnice in prirobnični spoji - Okrogle prirobnice za cevi, ventile, fitinge in pribor
z oznako PN - 2. del: Prirobnice iz litega železa
Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN
designated - Part 2: Cast iron flanges
Flansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke
und Zubehörteile, nach PN bezeichnet - Teil 2: Gußeisenflansche
Brides et leurs assemblages - Brides circulaires pour tuyaux, appareils de robinetterie,
raccords et accessoires, désignées PN - Partie 2 : Brides en fonte
Ta slovenski standard je istoveten z: EN 1092-2:2023
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1092-2
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2023
EUROPÄISCHE NORM
ICS 23.040.60 Supersedes EN 1092-2:1997
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 circulaires pour Flansche und ihre Verbindungen - Runde Flansche für
tuyaux, appareils de robinetterie, raccords et Rohre, Armaturen, Formstücke und Zubehörteile, nach
accessoires, désignées PN - Partie 2 : Brides en fonte PN bezeichnet - Teil 2: Gußeisenflansche
This European Standard was approved by CEN on 22 October 2023.

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 obtained on application to the CEN-CENELEC 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
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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1092-2:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Designation and types . 7
4.1 Range of DN . 7
4.2 Range of PN designations . 7
4.3 Types of flanges . 7
4.4 Standard designation . 7
4.5 Information to be supplied by the purchaser . 8
5 General requirements . 8
5.1 Flange materials . 8
5.2 Repairs by welding . 8
5.3 Bolting . 8
5.4 Gaskets . 8
5.5 Pressure/Temperature ratings (p/T) . 8
5.5.1 General. 8
5.5.2 p/T rating of flanged joints . 9
5.6 Dimensions. 9
5.7 Flange facings . 9
5.7.1 Types of facings . 9
5.7.2 Jointing face finish . 10
5.8 Spot facing or back facing . 10
5.9 Tolerances . 10
5.10 Marking and stamping . 11
5.10.1 Marking . 11
5.10.2 Stamping . 11
5.10.3 Omission of markings . 11
5.11 Quality assurance . 11
5.11.1 General. 11
5.11.2 Quality assurance system . 11
Annex A (normative) Information to be supplied by the purchaser . 59
Annex B (Informative) NOTES to Tables 6 to 13 . 60
Bibliography . 61
European foreword
This document (EN 1092-2:2023) has been prepared by Technical Committee CEN/TC 74 “Flanges and
their joints”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2024, and conflicting national standards shall be
withdrawn at the latest by May 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1092-2:1997.
In comparison with the previous edition, the following technical modifications have been made:
— update of normative references;
— introduction of new DN and PN;
— specification regarding repairs and face finish.
EN 1092 will consist of the following four parts:
— Part 1: Steel flanges;
— Part 2: Cast iron flanges;
— Part 3: Copper alloy flanges;
— Part 4: Aluminium alloy flanges.
This document is related to ISO 7005-2:1988 and ISO 2531:2009, as types of flanges and their mating
dimensions are compatible with those flanges of the same DN and PN.
The mating dimensions of the flanges of this document are compatible with those flanges of other
materials in accordance with the other parts of EN 1092 series.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Türkiye and the United
Kingdom.
Introduction
Materials that are in permanent or temporary contact with drinking water are not detrimental to the
quality of the drinking water and do not violate EC Directives or EFTA regulations concerning the quality
of drinking water.
1 Scope
This document 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 100.
NOTE See 4.1 and 4.2 for information regarding allowed DN and PN.
This document specifies the types of flanges and their facings, dimension 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
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 545:2010, Ductile iron pipes, fittings, accessories and their joints for water pipelines - Requirements and
test methods
EN 1092-1:2018, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN
designated - Part 1: Steel flanges
EN 1370:2012, Founding — Examination of surface condition
EN 1561:2011, Founding - Grey cast irons
EN 1563:2018, Founding - Spheroidal graphite cast irons
EN ISO 4287:2005, Geometrical product specifications (GPS) — Surface texture: Profile method — Terms,
definitions and surface texture parameters (ISO 4287)
ISO 185:2005, Grey cast irons — Classification
ISO 887:2000, Plain washers for metric bolts, screws and nuts for general purposes — General plan
ISO 1083:2018, Spheroidal graphite cast irons — Classification
ISO 5922:2005, Malleable cast iron
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 https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
flange
flat circular end of a pipe component extending perpendicular to its axis, with bolt holes equally spaced
on a circle
NOTE 1 to entry: See Figure 1.
NOTE 2 to entry: A flange can be fixed (i.e. integrally cast, screwed or welded on) or adjustable; an adjustable 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)
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes and which comprises the letters DN followed by a dimensionless whole number that is
indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end
connections
NOTE 1 to entry: The number following the letters DN does not represent a measurable value and should not be
used for calculation purposes except where specified in the relevant standard.
NOTE 2 to entry: In those standards which use the DN designation system, any relationship between DN and
component dimensions should be given, e.g. DN/OD or DN/ID.
[SOURCE: EN ISO 6708:1995, 2.1]
3.3
PN
alphanumeric designation which is used for reference purposes related to a combination of mechanical
and dimensional characteristics of a component of a pipework system and which comprises the letters
PN followed by a dimensionless number
NOTE 1 to entry: The number following the letters PN does not represent a measurable value and should not be
used for calculation purposes except where specified in the relevant standard.
NOTE 2 to e
...

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