SIST EN 1092-2:2024

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 entry: The designation PN is not meaningful unless it is related to the relevant component standard
number.
NOTE 3 to entry: The maximum allowable pressure of a pipework component depends on the PN number, the
material and the design of the component, its maximum allowable temperature, etc. The relevant
component standards include tables of specified pressure/temperature ratings (p/T)or, in minimum, include rules
how to determine pressure/temperature ratings (p/T).
NOTE 4 to entry: It is intended that all components with the same PN and DN designations have the same mating
dimensions for compatible flange types.
[SOURCE: EN 1333:2006, 2.1]
3.4
ductile iron
cast iron in which graphite is present substantially in spheroidal form
3.5
grey iron
cast iron in which graphite is present substantially in lamellar form
3.6
malleable iron
cast iron in which graphite is present substantially in nodular form (temper carbon), and can be partially
or wholly decarburized
3.7
joint
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 60 – 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 2500 – DN 2600 – DN 2800 – DN 3000 – DN 3200 – DN 3400 – DN 3600 – DN 3800
– DN 4000.
The range of DN applicable to each flange type and to each PN shall be as specified in Tables 2 to 4 as
appropriate.
4.2 Range of PN designations
PN 2,5 – PN 6 – PN 10 – PN 16 – PN 25 – PN 40 – PN 63 – PN 100.
4.3 Types of flanges
Figure 1 illustrates flanges identified according to type:
a) 05: blank flange
b) 11: weld-neck flange
c) 12: hubbed slip-on flange for welding
d) 13: hubbed threaded flange
e) 14: hubbed socket welding flange
f) 16: adjustable flange
g) 21: integral flange
By agreement between customer and manufacturer, an integral flange, modified as follows, can be
supplied:
i) bolt hole diameters and flange facing diameter in accordance with EN 1092-1:2018;
ii) for ductile iron, flange thickness to be as grey iron flanges.
Such flanges is designated as type 21-2.
Figure 2 illustrates facing types A and B, which are used where applicable in conjunction with flanges
shown in Figure 1 (see 5.7.1).
4.4 Standard designation
Flanges conforming to this document shall be designated as follows:
a) term: flange;
b) number of this document: EN 1092-2;
c) DN (see 4.1);
d) PN (see 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 DN100, PN 40, type 11, material designated type MI (malleable
iron), with grade B30-06 and facing type A.
Flange EN 1092-2/DN100/PN40/11/MI B30-06/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 15. Material shall be selected
according to their field of application (environment, temperature, pressure and size).
5.2 Repairs by welding
When necessary, flanges can be repaired, in order to remove surface imperfections and localized and
visible defects. Repairs should not be accepted when metallurgy concern occurs. Repairs are carried out
according to the manufacturer’s 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 should be used.
5.4 Gaskets
The gaskets are not within the scope of this document. For information on types, dimensions and types
of gaskets, see relevant EN 1514 series.
5.5 Pressure/Temperature ratings (p/T)
5.5.1 General
The pressure/temperature ratings (p/T) of the flanges manufactured from the materials specified in
Table 15 correspond to the allowable non-surge pressure at the temperature given in Tables 16 and 17
(ductile iron), 18 (grey iron) and 19 (malleable iron). Linear interpolation is permitted for intermediate
temperatures.
NOTE The p/T rating of a flange is not necessarily the p/T rating of the whole pipework system. Gasket
materials can also impose limitation on the p/T rating of a flanged joint and the gasket manufacturer is consulted
when selecting the material of the gasket.
5.5.2 p/T rating of flanged joints
Where two flanges in a flanged joint do not have the same p/T rating, the p/T rating of the joint at any
temperature shall not exceed the lower of the two flanges p/T ratings at that temperature.
NOTE 1 Temperature is that of the contained fluid. Use of a temperature other than that of the contained fluid is
the responsibility of the user, subject to the requirements of any applicable code or regulation.
NOTE 2 For application of the p/T ratings given in this document to flange joints, take into consideration the risk
of leakage due to forces and moments developed in the connecting pipework.
NOTE 3 Owing to the nature of any thread sealing method used, additional limitations can be placed on a
threaded flange.
NOTE 4 These NOTES on service considerations are not intended to be exhaustive.
5.6 Dimensions
Dimensions of flanges shall be in accordance with the following Tables and Figures as appropriate:
— flanges PN 2,5: Table 6 and Figure 3;
— flanges PN 6: Table 7 and Figure 4;
— flanges PN 10: Table 8 and Figure 5;
— flanges PN 16: Table 9 and Figure 6;
— flanges PN 25: Table 10 and Figure 7;
— flanges PN 40: Table 11 and Figure 8;
— flanges PN 63: Table 12 and Figure 9;
— flanges PN 100: Table 13 and Figure 10.
NOTE 1 Dimensions which are not given in this document are determined by the manufacturer for his flange
design.
NOTE 2 Details of attachment for welded, threaded and adjustable flanges are not within the scope of this
document.
5.7 Flange facings
5.7.1 Types of facings
The flange facings specified (flat face type A and raised face type B) are illustrated in Figure 2 and their
raised face dimensions shall be as given in Table 5.
Flanges made of ductile iron shall have raised faces.
Flanges made of grey iron shall have raised faces. See 5.3 for the limitations on bolting due to this
material.
Flanges made of malleable iron shall have either flat faces or raised faces.
NOTE The transition from the outside diameter of the raised face to the flange face is at the option of the
manufacturer (i.e. either a radius or chamfer can be used).
5.7.2 Jointing face finish
All flange jointing faces shall be finished in accordance with Table 1. These faces shall be compared by
visual or tactile means with reference specimens which conform with the R , and R roughness values
a z
given in Table 1.
Flange connections, for example in drinking water applications, can usually be equipped with coated
flange surfaces for corrosion protection reasons. Table 1 does not include roughness relative to coated
surfaces.
An appropriate combination of flanges with an adequate gasket to compensate for the settling of the
coating shall be selected, e.g. rubber coated sealing ring with metal insert.
NOTE 1 It is not intended that instrument measurements are taken on the flange jointing faces: R and R values
a z
as defined in EN ISO 4287:2005 relate to the reference specimens.
NOTE 2 Other finishes can be agreed between the manufacturer and purchaser.
Table 1 — Numerical values of the surface finish parameters (R and R ) of flange jointing faces
a z
Values in micrometers
Manufacturing process R R
a z
Turning 3,2 to 12,5 12,5 to 50
Other machining processes 3,2 to 6,3 12,5 to 25
As cast 3,2 to 25 -
1)
“Turning” covers any method of machine operation producing either serrated concentric or serrated spiral
grooves.
2)
Machining processes other than turning are permissible provided that they give a surface finish in compliance
with the R and R values specified.
a z
3)
“As cast” covers surfaces produced by moulding processes where the resultant casting can or cannot be
subjected to shot or grit blast cleaning operations. Their roughness is assessed by comparison with reference
specimens complying with EN 1370:2012. As cast surfaces can have serrated concentric grooves to enhance
gasket sealing efficiency. They are normally used for application where joints incorporate gaskets of readily
deformable material, e.g. rubber, application for which the above surface characteristics can also apply to the
other manufacturing processes.
5.8 Spot facing or back facing
Any spot facing or back facing required shall not reduce the flange thickness to less than the thickness
specified. When spot facing is used, the diameter shall be large enough to accommodate the outside
diameter of the equivalent normal series of washers complying with ISO 887:2000, 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 face within 2°.
5.9 Tolerances
The tolerances or dimensions are as specified in Table 14.
5.10 Marking and stamping
5.10.1 Marking
Blank flanges and flanges which are supplied not attached to pipeline components shall be marked as
follows:
a) DN (nominal size);
b) PN designation;
c) material identification;
d) manufacturer’s name or trade-mark
EXAMPLE DN300 PN16 420-5 XXX
Where a flange is subsequently used to form an integral part of a component and the component has a
lower pressure p/T rating than that of the flange, the lower p/T rating should be clearly marked on the
component and the lower p/T rating applies.
5.10.2 Stamping
Where steel stamps are used, the marking shall be positioned on the outer rim of the flange. Low stress
round nose stamps shall be used.
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
marking of nominal size can be omitted.
5.11 Quality assurance
5.11.1 General
The following quality assurance requirement applies to all types of flanges except for those delivered
attached to a pipeline component. The quality assurance requirements for those flanges are given in the
appropriate component standards.
5.11.2 Quality assurance system
The manufacturer shall operate a quality assurance system (see EN ISO 9001:2015 for further
information).
Type 05
Blank flange
Type 11 Type 12
Weld-neck flange Hubbed slip-on flange for welding

Type 13 Type 14
Hubbed threaded flange Hubbed socket welding flange

Type 16 Type 21
Adjustable flange Integral flange
Figure 1 — Types of flanges
NOTE 1 The transition from the edge of the raised face to the flange jointing face is either by radius or chamfer
(see 5.7.1).
NOTE 2 Type 21 flange is an integral part of some other product or component.
NOTE 3 Flanges can be designated by type number or by description.
FprEN 1092-2:2023 (E)
Table 2 — Synoptic table for ductile iron flanges

DN
Type Table PN
8 10      ←Use PN 16→ X X X X X X X X X X X X X X X X X X X
9 16      X X X X X X X X X X X X X X X X X X X X X X X X X X X
10 25      ←Use PN 40→ X X X X X X X X X X X X X X X X X X X X X
Blank flange
11 40      X X X X X X X X X X X X X X X X X X X X X X X X X
12 63      X X X X X X X X X X X X X X X X X X X X X X

13 100      X X X X X X X X X X X X X X X
7 6      X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
8 10      ←Use PN 16→ X X X X X X X X
9 16      X X X X X X X X X X X X X X X X
Weld-neck
flange
10 25      ←Use PN40→ X X X X X X X X X X
11 40      X X X X X X X X X X X X X

12 63      X X X X X X X X X X X X X
8 10      ←Use PN 16→ X X X X X X X X X X X X X X X X X X X
9 16      X X X X X X X X X X X X X X X X X X X X X X X X X X X
Hubbed slip-
on flange for
10 25      ←Use PN 40→ X X X X X X X X X X X X X X X X X X X X X
welding
11 40      X X X X X X X X X X X X X X X X X X X X X X X X X
12 63      X X X X X X X X X X X X X X X X X X X X X X

13 100      X X X X X X X X X X X X X X X
Table 2 — Synoptic table for ductile iron flanges

DN
Type Table PN
8 10      ←Use PN 16→ X X X X X X X X X X X X
9 16      X X X X X X X X X X X X X X X X X X X X
Hubbed
10 25      ←Use PN 40→ X X X X X X X X X X X X X X
threaded
flange
11 40      X X X X X X X X X X X X X X X X
12 63      X X X X X X X X X X X X X

8 10      ←Use PN 16→ X X X X X X X X X X X X X X X X X X X
9 16      X X X X X X X X X X X X X X X X X X X X X X X X X X X
Hubbed 10 25      ←Use PN 40→ X X X X X X X X X X X X X X X X X X X X X
socket
11 40      X X X X X X X X X X X X X X X X X X X X X X X X X
welding flange
12 63      X X X X X X X X X X X X X X X X X X X X X X

13 100      X X X X X X X X X X X X X X X
8 10      ←Use PN 16→ X X X X X X X X
9 16      X X X X X X X X X X X X X X X X
Adjustable
10 25      ←Use PN 40→ X X X X X X X X X X
flange
11 40      X X X X X X X X X X X X

Table 2 — Synoptic table for ductile iron flanges

DN
Type Table PN
7 6 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
8 10 ←Use PN 16→ X X X X X X X X X X X X X X X X X X X X X X X X X
9 16 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
10 25 X X X X X ←Use PN 40→ X X X X X X X X X X X X X X X X X X X X X
Integral
flange
11 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
(1)
12 63      X X X X X X X X X X X X X X X X X X X X X X

13 100      X X X X X X X X X X X X X X X
NOTE 1: “X” indicates the range of DN in which flanges of a particular type and PN can be ordered to this document.
NOTE 2: Type 21–2 flanges are possible by agreement between manufacturer and purchaser (see NOTES in Tables 6 and 7).
(1): DN 10 to 32 are limited to type 21–2.
Table 3 — Synoptic table for grey iron flanges

DN
Type Table PN
6 2,5 ←Use PN 6→ X X X X X X X X X X X X X X X X X X
7 6 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
8 10 ←Use PN 16→ X X X X X X X X X X X X X X X X X X X
Blank flange
9 16 X X X X X X X X X X X X X X X X X X X X X X X X X
10 25 ←Use PN 40→ X X X X X X X X X X

11 40 X X X X X X X X X X X X X X X X X X
6 2,5
13 7 6
Hubbed
←Use PN
8 10          X X X
threaded
16→
flange
9 16          X X X X X X X
10 25
11 40
Table 3 — Synoptic table for grey iron flanges

DN
Type Table PN
6 2,5 ←Use PN 6→ X X X X X X X X X X X X X X X X X X
7 6 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
8 10 ←Use PN 16→ X X X X X X X X X X X X X X X X X X X X
Integral
9 16 X X X X X X X X X X X X X X X X X X X X X X X X X
flange
10 25 ←Use PN 40→ X X X X X X X X X X

11 40 X X X X X X X X X X X X X X X X X X
NOTE: “X” indicates the range of DN in which flanges of a particular type and PN can be ordered to this document.
Table 4 — Synoptic table for malleable iron flanges

DN
Type Table PN
7 6 X X X X X X X X X X X X X X X X
8 10 ←Use PN 16→ X X X
Blank flange
9 16 X X X X X X X X X X X X X X X X

10 25 ←Use PN 40→ X X X X X
11 40 X X X X X X X X X X X X X X X X

7 6 X X X X X X X X X X X X X
8 10 ←Use PN 16→
Hubbed
9 16 X X X X X X X X X X X X X
threaded
10 25 ←Use PN 40→ X X
flange
11 40 X X X X X X X X X X X X X

7 6 X X X X X X X X X X X X X X X X
8 10 ←Use PN 16→ X X X
Integral
9 16 X X X X X X X X X X X X X X X X
flange
10 25 ←Use PN 40→ X X X X X
11 40 X X X X X X X X X X X X X X X X
NOTE: “X” indicates the range of DN in which flanges of a particular type and PN can be ordered to this document.
FprEN 1092-2:2023 (E)
Type A Type B
Flat face Raised face
Figure 2 — Flange facing types A and B
NOTE  See Table 5 for f and d values of type B.
Table 5 — Dimensions for type B flange facings
Dimensions in millimetres
d
DN f
PN 2,5 PN 6 PN 10 PN 16 PN 25 PN 40 PN 63 PN 100
10 2 33 33 41 41 41 41 - -
15 2 38 38 46 46 46 46 - -
20 2 48 48 56 56 56 56 - -
25 3 58 58 65 65 65 65 - -
32 3 69 69 76 76 76 76 - -
40 3 78 78 84 84 84 84 84 84
50 3 88 88 99 99 99 99 99 99
60 3 98 98 108 108 108 108 108 108
65 3 108 108 118 118 118 118 118 118
80 3 124 124 132 132 132 132 132 138
100 3 144 144 156 156 156 156 156 162
125 3 174 174 184 184 184 184 184 188
150 3 199 199 211 211 211 211 211 218
200 3 254 254 266 266 274 284 284 285
d
DN f
PN 2,5 PN 6 PN 10 PN 16 PN 25 PN 40 PN 63 PN 100
250 3 309 309 319 319 330 345 345 345
300 4 363 363 370 370 389 409 409 410
350 4 413 413 429 429 448 465 465 465
400 4 463 463 480 480 503 535 535 535
450 4 518 518 530 548 548 560 560 560
500 4 568 568 582 609 609 615 615 615
600 5 667 667 682 720 720 735 735 -
700 5 772 772 794 794 820 840 840 -
800 5 878 878 901 901 928 960 960 -
900 5 978 978 1001 1001 1028 1070 1070 -
1000 5 1078 1078 1112 1112 1140 1180 1180 -
1100 5 - - 1218 1218 1240 1240 1240 -
1200 5 1280 1295 1328 1328 1350 1380 1380 -
1400 5 1480 1510 1530 1530 1560 1600 - -
1500 5 - - 1640 1640 1678 1678 - -
1600 5 1690 1710 1750 1750 1780 1815 - -
1800 5 1890 1918 1950 1950 1985 2035 - -
2000 5 2090 2125 2150 2150 2210 - - -
2200 6 2295 2335 2370 2366 - - - -
2400 6 2495 2545 2550 2570 - - - -
Table 5 — Dimensions for type B flange facings
d
DN f
PN 2,5 PN 6 PN 10 PN 16 PN 25 PN 40 PN 63 PN 100
2500 6 - 2642 2665 2676
2600 6 2695 2750 2780 2832 - - - -
2800 6 2910 2960 2968 3020 - - - -
3000 6 3110 3160 3160 3172 - - - -
3200 6 3310 3370 - - - - - -
3400 6 3510 3580 - - - - - -
3600 6 3720 3790 - - - - - -
3800 6 3920 - - - - - - -
4000 6 4120 - - - - - - -
Dimensions in millimetres
Type 05
Type 21
This diagram illustrates the arrangement but not necessarily the correct

number of bolt holes; refer to Table 6 for the actual number.
NOTE For facing dimensions, see Table 5.
Figure 3 — Dimensions of PN 2,5 flanges
Table 6 — Dimensions of PN 2,5 flanges
Dimensions in millimetres
Mating dimensions
Flange thickness
Maximal
Diameter
Diameter diameter Neck Corner
Bolting
of
Outside
of diameter radii
of
Grey iron Malleable
diameter
bolt
shoulder
Ductile iron
bolt hole (1) iron
circle
Number Size
D K L C C C G N r
Flange type
DN
05/21   05/21  05 21 21
Use PN 6 dimensions
See Table 7
(1) These flange thicknesses are also valid for ductile iron flanges type 21-2
Table 6 — Dimensions of PN 2,5 flanges
Dimensions in millimetres
Mating dimensions
Flange thickness Maximal
Diameter diameter Neck Corner
Diameter
Bolting
Outside
of diameter radii
of
of
Grey iron Malleable
diameter
Ductile iron shoulder
bolt circle
bolt hole (1) iron
Number Size
D K L C C C G N r
Flange type
DN
05/21   05/21  05 21 21
Use PN 6 dimensions
See Table 7
1200 1375 1320 31 32 M27 - - 30 - 1185 1250 8
1400 1575 1520 31 36 M27 - - 30 - 1385 1452 8
1600 1790 1730 31 40 M27 - - 32 - 1585 1654 10
1800 1990 1930 31 44 M27 - - 34 - 1785 1856 10
2000 2190 2130 31 48 M27 - - 34 - 1985 2056 10
2200 2405 2340 34 52 M30 - - 36 - 2185 2260 10
2400 2605 2540 34 56 M30 - - 38 - 2385 2464 10
2600 2805 2740 34 60 M30 - - 40 - 2585 2668 10
2800 3030 2960 37 64 M33 - - 42 - 2785 2868 12
Mating dimensions
Flange thickness
Maximal
Diameter diameter Neck Corner
Diameter
Bolting
Outside
of diameter radii
of
of
Grey iron Malleable
diameter
shoulder
Ductile iron
bolt circle
bolt hole
(1) iron
Number Size
D K L C C C G N r
Flange type
DN
05/21   05/21  05 21 21
(1) These flange thicknesses are also valid for ductile iron flanges type 21-2
Table 6 — Dimensions of PN 2,5 flanges
Dimensions in millimetres
Mating dimensions
Flange thickness
Maximal
Diameter
Diameter
diameter Neck Corner
Outside
Bolting
of
of diameter radii
diamete of
Grey iron Malleable
bolt Ductile iron shoulder
r
(1) iron
bolt hole
circle
Number Size
D K L C C C G N r
Flange type
DN
05/21   05/21  05 21 21
3000 3230 3160 37 68 M33 - - 42 - 2985 3068 12
3200 3430 3360 37 72 M33 - - 44 - 3185 3268 12
3400 3630 3560 37 76 M33 - - 46 - 3385 3472 12
3600 3840 3770 37 80 M33 - - 48 - 3585 3676 12
3800 4045 3970 41 80 M36 - - 48 - 3785 3876 12
4000 4245 4170 41 84 M36 - - 50 - 3985 4076 12
(1) These flange thicknesses are also valid for ductile iron flanges type 21-2.
Type 05
Type 21
Type 13
This diagram illustrates the arrangement
but not necessarily the correct number of
bolt holes; refer to Table 7 for the actual
number.
NOTE For facing dimensions, see Table 5.
Figure 4 — Dimensions of PN 6 flanges
Table 7 — Dimensions of PN 6 flanges
Dimensions in millimetres
Mating dimensions
Flange thickness Maximal
diameter Neck Corner
Diameter Diameter
Bolting
Outside
of diameter radii
of of
Grey iron Malleable
diameter
Ductile iron shoulder
bolt circle bolt hole
(1) iron
Number Size
D K L C C C G N r
Flange type
DN
05/13/21   05/21 05/13/21 05 13/21 13/21
10 75 50 11 4 M10 - - 12 12 - 20 3
15 80 55 11 4 M10 - - 12 12 - 26 3
20 90 65 11 4 M10 - - 14 14 - 34 4
25 100 75 11 4 M10 - - 14 14 - 44 4
32 120 90 14 4 M12 - - 16 16 - 54 5
40 130 100 14 4 M12 - - 16 16 - 64 5
50 140 110 14 4 M12 - - 16 16 - 74 5
60 150 120 14 4 M12 - - 16 16 - 84 6
65 160 130 14 4 M12 - - 16 16 - 94 6
80 190 150 19 4 M16 - - 18 18 - 110 6
100 210 170 19 4 M16 - - 18 18 - 130 6
125 240 200 19 8 M16 - - 20 20 - 160 6
150 265 225 19 8 M16 - - 20 20 - 182 8
200 320 280 19 8 M16 - - 22 22 - 238 8
250 375 335 19 12 M16 - - 24 24 - 284 10
300 440 395 23 12 M20 - - 24 24 - 342 10
350 490 445 23 12 M20 - - - - 335 392 10
Mating dimensions
Flange thickness
Maximal
Neck Corner
diameter
Diameter Diameter
Bolting
Outside
of diameter radii
of of
Grey iron Malleable
diameter
shoulder
Ductile iron
bolt circle bolt hole
(1) iron
Number Size
D K L C C C G N r
Flange type
DN
05/13/21   05/21 05/13/21 05 13/21 13/21
(1) These flange thicknesses are also valid for ductile iron flanges type 21-2.
Table 7 — Dimensions of PN 6 flanges
Dimensions in millimetres
Mating dimensions
Flange thickness Maximal
diameter Neck Corner
Bolting
Diameter of Diameter of
Outside
of diameter radii
Grey iron Malleable
diameter
bolt circle bolt hole
shoulder
Ductile iron
(1) iron
Number Size
D K L C C C G N r
Flange type
DN
05/13/21   05/21 05/13/21 05 13/21 13/21
400 540 495 23 16 M20 - - - - 385 442 10
450 595 550 23 16 M20 - - - - 435 494 12
500 645 600 23 20 M20 - - - - 485 544 12
600 755 705 28 20 M24 - - - - 585 642 12
700 860 81
...