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SLOVENSKI STANDARD
oSIST prEN 12560-1:2023
01-januar-2023
Prirobnice in prirobnični spoji - Mere tesnil za prirobnice z oznako Class - 1. del:
Nekovinska ravna tesnila z vložkom ali brez njega
Flanges and their joints - Dimensions of gaskets for Class-designated flanges - Part 1:
Non-metallic flat gaskets with or without inserts
Flansche und ihre Verbindungen - Maße für Dichtungen für Flansche mit Class-
Bezeichnung - Teil 1: Flachdichtungen aus nichtmetallischem Werkstoff mit oder ohne
Einlagen
Brides et leurs assemblages - Dimensions des joints pour les brides désignées Class -
Partie 1 : Joints plats non-métalliques avec ou sans insert
Ta slovenski standard je istoveten z: prEN 12560-1
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
23.040.80 Tesnila za cevne zveze Seals for pipe and hose
assemblies
oSIST prEN 12560-1:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 12560-1:2023
oSIST prEN 12560-1:2023
DRAFT
EUROPEAN STANDARD
prEN 12560-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2023
ICS 23.040.80 Will supersede EN 12560-1:2001
English Version
Flanges and their joints - Dimensions of gaskets for Class-
designated flanges - Part 1: Non-metallic flat gaskets with
or without inserts
Brides et leurs assemblages - Dimensions des joints Flansche und ihre Verbindungen - Maße für
pour les brides désignées Class - Partie 1 : Joints plats Dichtungen für Flansche mit Class-Bezeichnung - Teil
non-métalliques avec ou sans insert 1: Flachdichtungen aus nichtmetallischem Werkstoff
mit oder ohne Einlagen
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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12560-1:2023 E
worldwide for CEN national Members.
oSIST prEN 12560-1:2023
prEN 12560-1:2023 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviations . 6
5 Classification, designation and coding . 6
5.1 Range of Class designation . 6
5.2 Range of NPS designation . 7
5.3 Gasket types . 7
5.4 Information to be supplied by the purchaser . 7
5.4.1 Mandatory information . 7
5.4.2 Optional information . 7
5.5 Gasket designs and materials . 7
6 Gasket types . 8
7 Range of gasket sizes . 11
8 Dimensions. 11
8.1 Thickness . 11
8.2 Diameters . 11
8.3 Tolerances . 15
9 Marking . 16
Annex A (informative) Gasket materials . 17
Bibliography . 19
Figures
Figure 1— Types of flange facings and gaskets . 9
Figure 2 — Gasket dimensions . 10
Figure 3 — Flange facing types . 10
oSIST prEN 12560-1:2023
prEN 12560-1:2023 (E)
Tables
Table 1 — Range of gasket sizes. 11
Table 2 — Gasket dimensions of type IBC (Inside Bolt Circle) Class 150 – 900. 11
Table 3 — Dimensions of Class designated gaskets Type FF (Full Face) . 13
Table 4 — Dimensions for Class designated gaskets Type TG (Tongue and Groove) and SP
(Spigot and Recess) Class 300 - 900 . 15
Table 5 — Tolerance for non-metallic gasket dimensions . 16
Table 6 — Additional tolerance for non-metallic gasket dimensions not listed in Table 5 . 16
Table A.1 — Coding for sheet material . 17
oSIST prEN 12560-1:2023
prEN 12560-1:2023 (E)
European foreword
This document (prEN 12560-1:2023) 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 12560-1:2001.
In comparison with the previous edition EN 12560-1:2001, the following technical modifications have
been made:
a) normative references have been updated;
b) terms and definitions have been updated;
c) Clause 4 “Symbols and abbreviations” has been inserted;
d) in Clause 5 information to be supplied by the purchaser has been revised and more details have
been added;
e) in Clause 8 table with gasket dimensions have been arranged according gasket types and tolerances
for gaskets have been introduced in 8.3;
f) in Clause 9 former content has been incorporated in Clause 8 and markings have been revised;
g) former Annex A “A-deviation” has been incorporated in 5.5;
h) new Annex A “gasket materials” to give guidance how to mark gaskets;
i) the document has been editorially revised.
EN 12560 will consist of the following seven parts:
— Part 1: Non-metallic flat gaskets with or without inserts
— Part 2: Spiral wound gaskets for use with steel flanges
— Part 3: Non-metallic PTFE envelope gaskets
— Part 4: Corrugated flat or grooved metallic and filled metallic gaskets for use with steel flanges
— Part 5: Metallic ring-joint gaskets for use with steel flanges
— Part 6: Covered serrated metal gaskets for use with steel flanges
— Part 7: Covered metal jacketed gaskets for use with steel flanges
oSIST prEN 12560-1:2023
prEN 12560-1:2023 (E)
Introduction
Dimensions for the internal diameter of gaskets are a compromise between all requirements of
EN 1759-1, prEN 1759-3 and prEN 1759-4 so that a single value is given for each gasket size.
1 Scope
This document specifies the dimensions, types, designation and marking of non-metallic flat gaskets,
with or without inserts, for flanges in accordance with EN 1759-1, EN 1759-3 and EN 1759-4, for
Class 150, Class 300, Class 600 and Class 900 for nominal sizes DN 15 to DN 600. In addition, this
document also gives guidance on typical materials used and how they should be marked.
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 1759-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, Class
designated — Part 1: Steel flanges, nominal pipe sizes NPS 1/2 to NPS 24
EN 1759-3, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, Class
designated — Part 3: Copper alloy flanges
EN 1759-4, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, Class
designated — Part 4: Aluminium alloy flanges
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
— ISO Online browsing platform: available at
3.1
DN
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes. It comprises the letters DN followed by a dimensionless whole number which is indirectly
related to the physical size, in millimeters, 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.
[SOURCE: EN ISO 6708:1995, 2.1]
3.2
NPS
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes. It comprises, for the purpose of Class designated flanges according to this document, the
letters NPS followed by a dimensionless number which is indirectly related to the physical size of the
bore or outside diameter of the end connections
oSIST prEN 12560-1:2023
prEN 12560-1:2023 (E)
Note 1 to entry: The number following the letters NPS does not represent a measurable value and should not be
used for calculation purposes except where specified in the relevant standard. See EN ISO 6708.
[SOURCE: EN 1759-3]
3.3
Class
alphanumeric designation used for reference purposes related to a combination of mechanical and
dimensional characteristics of a component of a pipework system. It comprises the word Class followed
by a dimensionless whole number
Note 1 to entry: The number following the word Class 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 Class is not meaningful unless it is related to the relevant component standard
number.
Note 3 to entry: It is intended that all components with the same Class and NPS (see below) designations have the
same mating dimensions for compatible flange types.
[SOURCE: EN 1759-3]
4 Symbols and abbreviations
For the purposes of this document, the following notations apply.
Where units are applicable, they are shown in brackets. Where units are not applicable, no indication is
given.
d Gasket inside diameter [mm]
D Gasket outside dia
...