CEN/TR 1591-2:2020
(Main)Flanges and their joints - Design rules for gasketed circular flange connections - Part 2: Gasket parameters
Flanges and their joints - Design rules for gasketed circular flange connections - Part 2: Gasket parameters
This document details generic gasket parameters for use in EN 1591-1 during preliminary calculations during which the type of gasket to be used in an application is to be decided. Once the gasket type has been decided the parameters for gaskets of that type from the different potential commercial suppliers should be used in further calculations as within a gasket type there will be differences depending upon the supplier.
WARNING - For the final calculations using the method given in EN 1591-1 the reader is directed to obtain gasket parameters for the selected generic type of gasket from the intended gasket manufacturer. This is because the data for a generic gasket type will vary between manufacturers. This variation can be seen in the tables of data which are embodied in this document.
Flansche und ihre Verbindungen - Regeln für die Auslegung von Flanschverbindungen mit runden Flanschen und Dichtung - Teil 2: Dichtungskennwerte
Dieses Dokument legt allgemeine Dichtungskennwerte für vorausgehende Berechnungen von Flanschverbindungen nach EN 1591 1 fest. Sobald der Dichtungstyp festgelegt wurde, sollten die Parameter für Dichtungen dieses Typs von den verschiedenen möglichen Lieferanten für weitere Berechnungen verwendet werden, da es innerhalb eines Dichtungstyps herstellerabhängige Unterschiede gibt.
WARNHINWEIS — Für die endgültigen Berechnungen nach dem in EN 1591 1 festgelegten Verfahren ist der Anwender gehalten, die Dichtungskennwerte für den ausgewählten Typ vom Dichtungshersteller zu beziehen. Dies ist notwendig, da die Dichtungskennwerte zwischen Herstellern variieren können. Diese Abweichungen können aus den Tabellen dieses Dokuments entnommen werden.
Brides et leurs assemblages - Règles de calcul des assemblages à brides circulaires avec joint - Partie 2 : Paramètres de joint
Le présent document spécifie des paramètres génériques de joints utilisables dans l’EN 1591 1 pendant les calculs préliminaires durant lesquels le type de joint à utiliser dans une application doit être choisi. Dès que le choix d’un type de joint a été décidé, il convient que les paramètres de ce type de joint obtenus auprès de différents fournisseurs commerciaux soient utilisés dans d’autres calculs puisque, pour un type de joint donné, des différences apparaitront en fonction du fournisseur de joints.
AVERTISSEMENT — Lors des calculs finaux réalisés conformément à la méthode de calcul donnée dans l’EN 1591 1, il est conseillé au lecteur d’obtenir des paramètres de joint pour le type de joint générique choisi auprès du fabricant de joints concerné, car les données pour un type de joint générique peuvent varier en fonction des fabricants. Cette variation peut être observée dans les tableaux de données spécifiés dans le corps du présent document.
Prirobnice in prirobnični spoji - Pravila za konstruiranje prirobičnih spojev, sestavljenih iz okroglih prirobnic in tesnil - 2. del: Parametri tesnil
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2020
Nadomešča:
SIST EN 1591-2:2008
Prirobnice in prirobnični spoji - Pravila za konstruiranje prirobičnih spojev,
sestavljenih iz okroglih prirobnic in tesnil - 2. del: Parametri tesnil
Flanges and their joints - Design rules for gasketed circular flange connections - Part 2:
Gasket parameters
Flansche und ihre Verbindungen - Regeln für die Auslegung von Flanschverbindungen
mit runden Flanschen und Dichtung - Teil 2: Dichtungskennwerte
Brides et leurs assemblages - Règles de calcul des assemblages à brides circulaires
avec joint - Partie 2 : Paramètres de joint
Ta slovenski standard je istoveten z: CEN/TR 1591-2:2020
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.
CEN/TR 1591-2
TECHNICAL REPORT
RAPPORT TECHNIQUE
March 2020
TECHNISCHER BERICHT
ICS 23.040.60 Supersedes EN 1591-2:2008
English Version
Flanges and their joints - Design rules for gasketed circular
flange connections - Part 2: Gasket parameters
Brides et leurs assemblages - Règles de calcul des Flansche und ihre Verbindungen - Regeln für die
assemblages à brides circulaires avec joint - Partie 2 : Auslegung von Flanschverbindungen mit runden
Paramètres de joint Flanschen und Dichtung - Teil 2: Dichtungskennwerte
This Technical Report was approved by CEN on 10 February 2020. It has been drawn up by the Technical Committee CEN/TC 74.
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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 1591-2:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Typical gasket parameters for various gasket styles . 4
4.1 General . 4
4.2 Q , Q . 5
min[L] Smin[L]
4.3 Qsmax, PQR and ΔeGc . 21
4.4 E and e . 25
G G
Annex A (informative) Relation between the gasket types and the codes used in the tables . 35
Annex B (informative) Public sources of reliable data . 38
Bibliography . 39
European foreword
This document (CEN/TR 1591-2:2020) has been prepared by Technical Committee CEN/TC 74 “Flanges
and their joints”, the secretariat of which is held by DIN.
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 1591-2:2008.
The major changes in comparison with EN 1591-2:2008 include:
• The introduction of the creep parameter Δe ;
Gc
• The introduction of the compressed gasket thickness measured during compression phase e ;
G
• The removal of E and e results tables for the gasket codes K04, E02, G02, A02, G01, B01 and F01
G G
showing measurement discrepancies.
EN 1591, “Flanges and their joints — Design rules for gasketed flange connections” consists of the
following parts:
— Part 1: Calculation method
— Part 2: Gasket parameters (CEN/TR)
— Part 3: Calculation method for metal to metal contact type flanged joint (CEN/TS)
— Part 4: Qualification of personnel competency in the assembly of the bolted connections of critical
service pressurized systems Pressure Equipment Directive;
— Part 5: Calculation method for full face gasketed joints (CEN/TR).
The data values given in this document were all determined by the test methods given in EN 13555. The
1)
data given was obtained during the PERL Project during which the test methods of EN 13555 were
assessed for practicability and repeatability by the test laboratories at MPA and CETIM (see footnotes 2
and 3 of Table A.1). The materials selected for evaluation during that project were those suggested by
the organisations taking part in the PERL project. The materials tested in that project, and therefore the
data given in this document, are just a selection of the total range of commercial gasket offerings that
are available from the various gasket manufacturers and distributors. The data presented in this
document is intended to assist engineers using EN 1591-1 during their preliminary calculations. Other
public sources of reliable data are given in Annex B. In all cases it is expected that engineers will obtain
from the manufacturer of their choice the data for the gasket intended to be used in the application in
hand. The website of the European Sealing Association, http://www.europeansealing.com/, contains
links to their members throughout Europe.
The importance of using the data for the exact style, make and thickness of gasket intended to be used
can be seen from the dispersion of the results between gasket makes within a style and thickness in this
document.
1)
PERL, Pressure Equipment, Reduction of Leak rate: Gasket parameters measurement, RTD Project in the Framework of the
"Competitive & Sustainable Growth" Programme.
1 Scope
This document details generic gasket parameters for use in EN 1591-1 during preliminary calculations
during which the type of gasket to be used in an application is to be decided. Once the gasket type has
been decided the parameters for gaskets of that type from the different potential commercial suppliers
should be used in further calculations as within a gasket type there will be differences depending upon
the supplier.
WARNING — For the final calculations using the method given in EN 1591-1 the reader is directed to
obtain gasket parameters for the selected generic type of gasket from the intended gasket
manufacturer. This is because the data for a generic gasket type will vary between manufacturers. This
variation can be seen in the tables of data which are embodied in this document.
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 1591-1, Flanges and their joints - Design rules for gasketed circular flange connections - Part 1:
Calculation
EN 13555, Flanges and their joints - Gasket parameters and test procedures relevant to the design rules
for gasketed circular flange connections
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1591-1 and EN 13555 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/ui
— IEC Electropedia: available at http://www.electropedia.org/
4 Typical gasket parameters for various gasket styles
4.1 General
The data given in the following tables is only intended to be used in preliminary calculations using
EN 1591-1. The data was obtained using the test methods given in EN 13555 during the testing of a
selection of a few of the many styles and makes of commercial gasket that are on offer in Europe. For
final calculations the user of EN 1591-1 should contact the gasket supplier of choice and obtain the data
for the style and thickness of the gasket intended to be used.
EN 13555 permits the testing of gaskets sized for either DN40/PN40 or NPS 4 CLASS 300 flanges. All
the data values given in this document were obtained from DN40/PN40 gaskets.
It should be noted that the rules of EN 13555 regarding Q have been adhered to in that where no
Smax
collapse was found during the Q test then the value of Q is taken to be that of the surface
Smax Smax
pressure, Q , used during the P test with the highest surface pressure tabulated.
i QR
The data in the following sets of tables is presented in three gasket parameter groupings, Q and
min[L]
QSmin[L] in the 4.2 set of tables followed by QSmax and PQR in the 4.3 set and then EG and eG in the 4.4 set to
allow easy appreciation of how the parameter varies with gasket type. A brief explanation of the
parameters in the grouping is given at the start of each set. For more information about the gasket
parameters or test methods EN 13555 should be consulted.
Data generated in accordance with EN 13555 should be used together with EN 1591-1 to ensure that a
flanged joint is as safe and as tight as required results. It will never be possible for the gasket
parameters to be tabulated at all values of the controlling parameters so results at the next “worse”
values of those controlling parameters should be used to ensure that the result is conservative.
The various parameters that are obtained from gaskets by the tests detailed in EN 13555 are inter-
related in complex ways and the guidance given below is in some respects simplistic in view of those
inter-relationships. If further guidance is required it is recommended that the favoured suppliers or
manufacturers should be consulted as they will be able to provide all the necessary guidance that is
required to aid the selection of an optimized solution for any sealing application.
Q is influenced by Q , the higher the level of Q achieved on assembly the better.
Smin[L] A A
Q will be limited by either the maximum bolt load available, the maximum flange loading that can be
A
permitted or the maximum gasket loading, Q , that can be withstood.
Smax
High values of Q are desirable. Where a value of Q is not tabulated at the temperature and gasket
Smax Smax
thickness of interest then the value for Q at the next higher values should be used.
Smax
For secure achievement of a given level of tightness, L, the lower the values of Q and Q the
min[L] Smin[L]
better. Where data are tabulated for more than one helium pressure then interpolation to deduce a
value for the pressure of interest is permitted. Where data are not available for the thickness of interest
then data for the next higher available thickness should be used.
Low values of Q and Q are desirable. A low difference between the Q values for
min[L] Smin[L] Smin[L]
successive values of L is also desirable as this indicates a low sensitivity to off-loading in service.
Within a gasket type, high values of P (respectively low values of Δe ) are desirable. Where a P
QR Gc QR
(respectively Δe ) value is not tabulated at exactly the required level of temperature, stiffness and
Gc
surface pressure then the value of P (respectively Δe ) at the next level above those required should
QR Gc
be used.
Low values of E are desirable but shall be considered in respect of the compressed thickness. Where a
G
value of E is not tabulated at exactly the required level of temperature, surface pressure and thickness
G
then the value of E at the next level above those required should be used.
G
The data in the following sets of tables was generated as the test methods of EN 13555 were evolving.
As a consequence, the data for some tested gaskets does not in all respects comply with the rules
subsequently derived and given in EN 13555. An instance of this is given by P (respectively Δe ) in
QR Gc
the 4.3 set of tables as values are only given for a stiffness of 500 kN/mm whereas the standard calls for
P (respectively Δe ) values for a range of stiffness to be determined.
QR Gc
The notes at the end of the 4.3 set of tables of Q , P and Δe give important guidance in the use of
Smax QR Gc
the data in that set of tables.
For relation between the gasket types and the codes used in the tables see Annex A.
4.2 Q , Q
min[L] Smin[L]
Q is the minimum gasket surface pressure on assembly required at ambient temperature in order
min[L]
to seat the gasket into the flange facing roughness and close the internal leakage channels so that the
tightness class is to the required level L for the internal test pressure.
Q is the minimum gasket surface pressure required under the service pressure conditions, i.e.
Smin[L]
after offloading and at the service temperature, so that the required tightness class L is maintained for
the internal test pressure. In the case of the data in Tables 2 to 16 then only values at ambient
temperature are given.
L is defined in te
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.