SIST EN 1092-4:2002

SLOVENSKI STANDARD
01-november-2002
Prirobnice in prirobnični spoji - Okrogle prirobnice za cevi, ventile, fitinge in pribor
z oznako PN - 4. del: Prirobnice iz aluminijevih zlitin
Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN
designated - Part 4: Aluminium alloy flanges
Flansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke
und Zubehörteile, nach PN bezeichnet - Teil 4: Flansche aus Aluminiumlegierungen
Brides et leurs assemblages - Brides circulaires pour tubes, appareils de robinetterie,
raccords et accessoires, désignées PN - Partie 4: Brides en alliages d'aluminium
Ta slovenski standard je istoveten z: EN 1092-4:2002
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
77.150.10 Aluminijski izdelki Aluminium products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 1092-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2002
ICS 23.040.60
English version
Flanges and their joints - Circular flanges for pipes, valves,
fittings and accessories, PN designated - Part 4: Aluminium
alloy flanges
Brides et leurs assemblages - Brides circulaires pour Flansche und ihre Verbindungen - Runde Flansche für
tubes, appareils de robinetterie, raccords et accessoires, Rohre, Armaturen, Formstücke und Zubehörteile, nach PN
désignées PN - Partie 4: Brides en alliages d'aluminium bezeichnet - Teil 4: Flansche aus Aluminiumlegierungen
This European Standard was approved by CEN on 28 March 2002.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1092-4:2002 E
worldwide for CEN national Members.

Contents
page
Foreword------------------------------------------------------------------------------------------------------ 3
1 Scope -------------------------------------------------------------------------------------------------- 4
2 Normative references----------------------------------------------------------------------------- 4
3 Terms and definitions ---------------------------------------------------------------------------- 5
4 Designations ---------------------------------------------------------------------------------------- 5
4.1 Range of DN 5
4.2 Range of PN designations 5
4.3 Types of flanges 5
4.4 Designation of flanges 5
5 General requirements ---------------------------------------------------------------------------- 6
5.1 Flange materials 6
5.2 Repairs 6
5.3 Bolting 6
5.4 Gaskets 6
5.5 Pressure temperature (p/T) ratings 6
5.6 Dimensions 6
5.7 Flange facings 7
5.8 Spot facing and back facing of flanges 7
5.9 Tolerances 7
5.10 Marking 7
Figure 1 - Types of flanges 8
Figure 2 - Flange facings 9
Figure 3 - Dimensions of PN 10 flanges 10
Figure 4 - Dimensions of PN 16 flanges 11
Figure 5 - Dimensions of PN 25 flanges 12
Figure 6 - Dimensions of PN 40 flanges 13
Figure 7 - Dimensions of PN 63 flanges 14
for 15
Annex A (informative) Masses of flanges---------------------------------------------------------16
Annex ZA (informative)  Clauses of this European Standard addressing
essential requirements (ER’s) or other provisions of EU Directives---------------------17
Table 1 - Synoptic table 8
Table 2 - Flange facing dimensions 9
Table 3 - Surface finish of flange jointing faces 9
Table 4 - Dimensions of PN 10 flanges 10
Table 5 - Dimensions of PN 16 flanges 11
Table 6 - Dimensions of PN 25 flanges 12
Table 7 - Dimensions of PN 40 flanges 13
Table 8 - Dimensions of PN 63 flanges 14
Table 9 - Tolerances on dimensions 15
Table 10 - p/T ratings 15
Table A.1 - Masses of flanges 16
Table ZA.1 - Correspondence between this European Standard and Directive
97/23/EC 17
Foreword
This document EN 1092-4:2002 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 November 2002, and conflicting national standards
shall be withdrawn at the latest by November 2002.
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).
For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this
document.
EN 1092 consists of the following four parts:
Part 1: Steel flanges;
Part 2: Cast iron flanges;
Part 3: Copper alloy flanges;
Part 4: Aluminium alloy flanges.
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 and with those flanges of ISO 7005.
Annex A is informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
1 Scope
This European Standard specifies requirements for PN designated circular flanges for pipes, valves,
fittings and accessories made from aluminium alloy in the range of DN 15 to DN 600 and PN10 to
PN 63 (see Table 1).
This European Standard specifies the types of flanges and their facings, dimensions and tolerances,
bolt sizes, surface finish of jointing faces, marking and materials together with associated
pressure/temperature (p/T) ratings.
The flanges are intended to be used for piping as well as for pressure vessels.
2 Normative references
This European Standard incorporates by dated or undated reference, 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 provisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
EN 764, Pressure equipment - Terminology and symbols - Pressure, temperature, volume.
EN 1333, Pipework components - Definition and selection of PN.
EN 1514, Flanges and their joints - Dimensions of gaskets for PN-designated flanges.
EN 1515-1, Flanges and their joints - Bolting - Part 1: Selection of bolting.
EN 12392, Aluminium and aluminium alloys - Wrought products - Special requirements for products
intended for the production of pressure equipment.
EN ISO 887, Plain washers for metric bolts, screws and nuts for general purposes - General plan
(ISO 887:2000).
EN ISO 4287, Geometrical product specifications (GPS) - Surface texture: Profile method - Terms,
definitions and surface texture parameters (ISO 4287:1997).
EN ISO 6708, Pipework Components - Definition and selection of DN (nominal size)
(ISO 6708:1995).
3 Terms and definitions
For the purposes of this European Standard the following terms and definitions apply.
3.1
DN
see EN ISO 6708
3.2
PN
see EN 1333
3.3
Ra, Rz
see EN ISO 4287
3.4
maximum allowable pressure, PS
PS means the maximum pressure for which the equipment is designed, as specified by the
equipment manufacturer
(See also EN 764, where it is defined as allowable pressure p ).
S
3.5
maximum allowable temperature, TS
TS means the maximum temperature for which the equipment is designed, as specified by the
equipment manufacturer
(See also EN 764, where it is defined as allowable temperature t ).
S
4 Designations
4.1 Range of DN
The range of DN applicable to each PN shall be as given in Table 1.
4.2 Range of PN designations
The range of PN designations shall be as given in Table 1.
4.3 Types of flanges
Figure 1 illustrates flanges identified according to type:
a) Type 05 Blank flange;
b) Type 11 Weld-neck flange.
4.4 Designation of flanges
The designation of the flanges shall contain the following information:
a) Description (flange);
b) Number of this standard (EN 1092-4);
c) Flange type number (11, 05 resp.);
d) Flange facing type (e.g. C);
e) DN (e.g. DN 300);
f) For type 11 flanges only, the neck diameter, A and the neck thickness, S, (e.g. 324 x 4);
g) PN (e.g. PN 40);
h) Material (e.g. EN AW-5083-O).
EXAMPLE 1
For a type 11 flange : Flange EN 1092-4 - 11 - C - DN 300 - 324 x 4 - PN 40 - EN AW-5083-O
EXAMPLE 2
For a type 05 flange : Flange EN 1092-4 - 05 - C - DN 300 - PN 40 - EN AW-5083-O
5 General requirements
5.1 Flange materials
Flanges shall be manufactured from the material grades EN AW-5083 (AlMg4,5Mn0,7) -O or
EN AW-6061 (AlMg1SiCu) -T6 as specified in EN 12392. Other materials may be used. For the
p/T ratings see 5.5.
Weld-neck flanges shall be forged or made from extruded bars; blank flanges shall be forged or
made from plate.
5.2 Repairs
Repair welding of the flanges is not permitted.
5.3 Bolting
5.3.1 The bolting shall be chosen according to the pressure, temperature and gasket.
5.3.2 Bolting materials shall be selected according to the following criteria:
a) For all service conditions in accordance with EN 1515-1 (bolt/nut): 5.6/5, 8.8/8, 25Ni-15Cr-
Ti/25Ni-15Cr-Ti, A4-70/A4-70, A2-70/A2-70, 18Cr-9Ni-Mo-AT+C/18Cr-9Ni-Mo, 18Cr-9Ni-
AT+C/18Cr-9Ni;
b) For less severe service conditions e. g. water service or in case of oversized flanged joints, in
accordance with EN 1515-1 (bolt/nut): A4-50/A4-50, A2-50/A2-50, 18Cr-9Ni-Mo/18Cr-9Ni-Mo,
18Cr-9Ni/18Cr-9Ni;
The choice of this bolting shall be based on either special experience or on recalculations.
c) Where bolting other than specified in EN 1515-1 is required, this shall be chosen according to
the parameters above so that the flanged joint remains tight under the expected operating
conditions.
5.3.3 The use of washers (EN ISO 887) is recommended.
5.4 Gaskets
Gaskets shall be selected from the relevant part of EN 1514.
NOTE If spiral wound gaskets are selected, than they should be low stress design (y = 5000, m = 3 for
calculation in accordance with ASME Code).
5.5 Pressure temperature (p/T) ratings
The pressure temperature ratings (p/T ratings) for the material grades in 5.1 are given in Table 10.
For other aluminium alloys, which may be used, the p/T ratings shall be established according to the
service conditions.
5.6 Dimensions
5.6.1 Dimensions of flanges shall be in accordance with Figure 3 to Figure 7 and as appropriate
the following Tables:
• PN 10 flanges: Table 4;
• PN 16 flanges: Table 5;
• PN 25 flanges: Table 6;
• PN 40 flanges: Table 7;
• PN 63 flanges: Table 8.
NOTE 1 Approximate masses of flanges are given in annex A.

NOTE 2 Figures 3 to 7 are identical. They are repeated for better handling of the standard.

5.6.2 Bolt holes shall be equally spaced on the pitch circle diameter.

5.6.3 If the neck thickness, S is ordered smaller than given in Tables 4 to 8, the inside diameter at
the neck shall be tapered at an angle of 14 ° to 18 °. If S is ordered greater, the bore diameter shall
be AS-·2 .
5.7 Flange facings
5.7.1 Types of facings
The types of flange facings shall be as given in Figure 2, and their dimensions shall be as given in
Table 2.
If not stated in the purchase order, flange facing B1 is standard for flanges up to PN 40, flange facing
B2 is standard for PN 63 flanges.

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 3.

N OTE 1 It is not intended that instrument measurements are taken on the jointing faces.

NOTE 2 Other jointing face finishes may be agreed.

For jointing face type B1, turning shall be carried out with a round-nosed tool in accordance with
Table 3.
5.8 Spot facing and back facing of flanges
Any spot facing and 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 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.

5.9 Tolerances
Tolerances on dimensions shall be as specified in Table 9.

5.10 Marking
All flanges shall be marked as follows:
a) Flange manufacturer's name or trade-mark (e.g. xxx);
b) Number of this standard (EN 1092-4);
c) DN (e.g. DN 300);
d) PN (e.g. PN 25);
e) Neck thickness if not standard (e.g. 7,1);
f) Material designation (e.g. EN AW-5083-O);
g) Batch number or suitable quality control number traceable to the batch number when test
certification is required (e.g. yyy).
EXAMPLE: xxx - EN 1092-4 - DN 300 - PN 25 - 7,1 - EN AW-5083-O - yyy

The flanges shall be clearly and permanently marked around the rim.
Table 1 - Synoptic table
Type PN DN
15 25 40 50 80 100 150 200
...