CEN/TS 1591-3:2007

Flanges and their joints - Design rules for gasketed circular flange connections - Part 3: Calculation method for metal to metal contact type flanged joint

The aim of this Technical Specification is to describe a calculation method dedicated to Bolted Flange Connections (BFC) with metal to metal contact (MMC). It is dedicated to BFC where MMC occurs in a region between the outside diameter of the gasket and the inside diameter of the bolt hole region. For MMC inside the gasket and for MMC outside the bolt hole region, the present method is not appropriate.
The calculation method proposed in this Technical Specification is mainly based on the method described in EN 1591-1, dedicated to floating type BFC. The behaviour of the complete flanges-bolts-gasket system is considered. In assembly condition as well as for all the subsequent load conditions, the BFC components are maintained together by internal forces. This leads to deformations and forces balances (see Annex F) which gives the basic relations between the forces variations in the BFC.
The calculation of BFC with MMC leads to the consideration of an additional force compared to the EN 1591-1 calculation method: the reaction force in the MMC area. It explains why two compliance equations are required in this Technical Specification (in the EN 1591-1 calculation method just one compliance equation is needed to determine the internal forces in all the load conditions).
Unlike EN 1591-1 where the internal forces variations are determined with the compliance relation between the assembly and the considered load condition, here, the internal forces variations are determined by using the compliance relations between two consecutive load conditions.
This method does not treat non-gasketed pipe joints.
1.1   Requirement for use of the Method
Where permitted, the Method is an alternative to design validation by other means e.g.
-   special testing;
-   proven practice.
-   Use of standard flanges within permitted conditions
1.2   Geometry
The Method is applicable to the configurations having:
-   flanges whose section is given or may be assimilated to those given in Figures

Flansche und ihre Verbindungen - Regeln für die Auslegung von Flanschverbindungen mit runden Flanschen und Dichtung - Teil 3: Berechnungsmethode für Flanschverbindungen mit Dichtungen im Kraft-Nebenschluss

Brides et leurs assemblages - Règles de calcul des assemblages à brides circulaires avec joint - Partie 3 : Méthode de calcul pour les assemblages à brides de type contact métal-métal

La méthode constitue l'une des alternatives possibles (quand cela est permis), pour la justification de la conception d'un assemblage, au même titre que d'autres, par exemple :
-   des essais spécifiques ;
-   la référence à une expérience pratique justifiée.
1.1   Géométrie
La méthode de calcul est applicable aux configurations présentant :
-   des brides dont la section correspond ou peut être assimilée à l'une de celles présentées sur les Figures 4 à 12 de l'EN 1591-1 ;
-   quatre boulons identiques ou plus, répartis régulièrement ;
-   joint conçu pour des applications avec contact métal métal ;
-   des dimensions de brides qui satisfont aux conditions suivantes :
a)     ;
b)     ;
c)    .
NOTE 1   Voir l'Article 3 pour la signification des symboles.
NOTE 2   La condition  n'a pas besoin d'être satisfaite pour le collet d'une bride tournante.
NOTE 3   La condition   a pour objet de limiter l'inégalité de la répartition de la compression du joint qui peut résulter de l'espacement des boulons. Les valeurs 0,01 et 0,10 sont à utiliser respectivement pour les joints à faible dureté (non métalliques) et pour les joints durs (métalliques). Un critère plus précis est donné en Annexe A de l'EN 1591-1.
NOTE 4   Il peut être nécessaire de prêter attention à la manière dont les tolérances et la corrosion peuvent modifier les dimensions ; en la matière, il y a lieu de se référer au code ou à la réglementation selon lequel (laquelle) le calcul est effectué, par exemple, ces valeurs sont spécifiées dans l'EN 13445 et l'EN 13480.
Les configurations suivantes sont hors du domaine d'application de la méthode de calcul :
brides présentant une géométrie globalement non axisymétrique, par exemple : brides à segments démontables, brides à goussets raidisseurs.

Prirobnice in prirobnični spoji - Pravila za načrtovanje okroglih prirobničnih spojev s tesnili - 3. del: Način izračuna za prirobnice s kovinskim stikom

General Information

• Status: Published
• Publication Date: 24-Jul-2007
• ICS: 23.040.60 - Flanges, couplings and joints
• Technical Committee: CEN/TC 74 - Flanges and their joints
• Drafting Committee: CEN/TC 74/WG 10 - Calculation methods
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 04-Dec-2009
• Completion Date: 04-Dec-2009
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: SIST EN 1591-3:2009 - Flanges and their joints - Design rules for gasketed circular flange connections - Part 3: Calculation method for metal to metal contact type flanged joint

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.RPFlansche und ihre Verbindungen - Regeln für die Auslegung von Flanschverbindungen mit runden Flanschen und Dichtung - Teil 3: Berechnungsmethode für Flanschverbindungen mit Dichtungen im Kraft-NebenschlussBrides et leurs assemblages - Regles de calcul des assemblages a brides circulaires avec joint - Partie 3 : Méthode de calcul pour les assemblages a brides de type contact métal-métalFlanges and their joints - Design rules for gasketed circular flange connections - Part 3: Calculation method for metal to metal contact type flanged joint23.040.60Prirobnice, oglavki in spojni elementiFlanges, couplings and jointsICS:Ta slovenski standard je istoveten z:CEN/TS 1591-3:2007SIST EN 1591-3:2009en,fr,de01-april-2009SIST EN 1591-3:2009SLOVENSKI
STANDARD
TECHNICAL SPECIFICATIONSPÉCIFICATION TECHNIQUETECHNISCHE SPEZIFIKATIONCEN/TS 1591-3July 2007ICS 23.040.60 English VersionFlanges and their joints - Design rules for gasketed circularflange connections - Part 3: Calculation method for metal tometal contact type flanged jointBrides et leurs assemblages - Règles de calcul desassemblages à brides circulaires avec joint - Partie 3 :Méthode de calcul pour les assemblages à brides de typecontact métal-métalFlansche und ihre Verbindungen - Regeln für dieAuslegung von Flanschverbindungen mit runden Flanschenund Dichtung - Teil 3: Berechnungsmethode fürFlanschverbindungen mit Dichtungen im Kraft-NebenschlussThis Technical Specification (CEN/TS) was approved by CEN on 16 June 2007 for provisional application.The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit theircomments, particularly on the question whether the CEN/TS can be converted into a European Standard.CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS availablepromptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)until the final decision about the possible conversion of the CEN/TS into an EN is reached.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. CEN/TS 1591-3:2007: ESIST EN 1591-3:2009

Example of Gasket compression curve.44 Annex B (informative)
Local compression deformation.48 Annex C (informative)
Relaxation of the gasket: Three-parameter solid model.50 Annex D (informative)
Scatter of bolting-up methods.54 Annex E (informative)
Calculation sequences.55 Annex F (informative)
Determination of the compliance equations.59 Bibliography.60
“Flanges and their joints”, the secretariat of which is held by DIN. EN 1591 "Flanges and their joints — Design rules for gasketed flange connections" consists of the following three parts:  Part 1: Calculation method  Part 2: Gasket parameters  Part 3: Calculation method for metal to metal contact type flanged joint (CEN/TS)  Part 4: Qualification of personnel competency in the assembly of bolted joints fitted to equipment sub-ject to the Pressure Equipment Directive
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Cyprus, Czech Re-public, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithua-nia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Swe-den, Switzerland and the United Kingdom. SIST EN 1591-3:2009
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