SIST EN 1092-1:2018
(Main)Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges
Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges
This European Standard for a single series of flanges specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400 and nominal sizes from DN 10 to DN 4000.
This European Standard specifies the flange types and their facings, dimensions, tolerances, threading, bolt sizes, flange jointing face surface finish, marking, materials, pressure/ temperature ratings and approximate flange masses.
For the purpose of this European Standard, "flanges" include also lapped ends and collars.
This European Standard applies to flanges manufactured in accordance with the methods described in Table 1.
Non-gasketed pipe joints are outside the scope of this European Standard.
Flansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke und Zubehörteile, nach PN bezeichnet - Teil 1: Stahlflansche
Brides et leurs assemblages - Brides circulaires pour tubes, appareils de robinetterie, raccords et accessoires, désignées PN - Partie 1 : Brides en acier
La présente Norme européenne pour un seul système de brides spécifie les prescriptions pour les brides circulaires en acier avec les désignations PN 2,5 à PN 400 et les diamètres nominaux DN 10 à DN 4000.
La présente Norme européenne définit les types de brides et leurs portées de joint, les dimensions, les tolérances, les filetages, les dimensions des boulons, les états de surface des faces de joints des brides, le marquage, les matériaux, les relations pression/température et les masses approximatives des brides.
Pour les besoins de la présente Norme européenne, le terme « brides » inclut aussi les collets et les extrémités embouties à souder.
La présente Norme européenne s'applique aux brides fabriquées selon les méthodes décrites au
Tableau 1.
Les assemblages de tuyauteries sans joints se trouvent hors du domaine d'application de la présente Norme européenne.
Prirobnice in prirobnični spoji - Okrogle prirobnice za cevi, ventile, fitinge in pribor z oznako PN - 1. del: Jeklene prirobnice
Ta osnutek evropskega standarda za posamezni niz prirobnic določa zahteve za okrogle jeklene prirobnice z oznakami PN od PN 2,5 do PN 400 in nominalno velikostjo od DN 10 do DN 4000.
Ta osnutek evropskega standarda določa vrste prirobnic in njihove prevleke, mere, tolerance, navoje, velikosti vijakov, površinski premaz stične ploskve prirobnice, označevanje, materiale, vrednosti tlaka/temperature in približne mase prirobnic.
Za namene tega osnutka evropskega standarda »prirobnice« vključujejo tudi preklopljene konce in obroče.
Ta osnutek evropskega standarda velja za prirobnice, proizvedene v skladu z metodami, opisanimi v preglednici 1.
Spoji cevi brez tesnil ne spadajo v področje uporabe tega osnutka evropskega standarda.
General Information
- Status
- Published
- Public Enquiry End Date
- 04-Jun-2016
- Publication Date
- 11-Jun-2018
- Technical Committee
- TLP - Pressure vessels
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 22-Mar-2018
- Due Date
- 27-May-2018
- Completion Date
- 12-Jun-2018
Relations
- Effective Date
- 01-Jul-2018
- Effective Date
- 01-Jul-2018
- Effective Date
- 01-Dec-2022
Overview
SIST EN 1092-1:2018 - "Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges" is the European standard that specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400 and nominal sizes DN 10 to DN 4000. The standard covers flange types, facings, dimensions, tolerances, threading, bolt sizes, surface finishes, marking, materials, p/T (pressure/temperature) ratings, and approximate flange masses. It also includes lapped ends and collars and applies to flanges manufactured by the methods referenced in the standard (see Table 1). Non‑gasketed pipe joints are excluded.
Key Topics and Requirements
- Scope and designation: Defines PN-based designation and DN size ranges for a single flange series.
- Flange types & facings: Specifies standardized flange types and jointing face styles (e.g., raised face, flat face, grooves).
- Dimensions & tolerances: Normative dimensions for mating, bolt holes, hubs, collars and limits for manufacturing tolerances.
- Materials & manufacturing: Requirements for base materials, permitted manufacture methods, and welding/repair provisions.
- Bolting & threading: Standard bolt sizes, thread specifications and bolt‑hole patterns for reliable joint integrity.
- Gaskets & jointing surface finish: Surface finish requirements for flange faces and guidance for gasket selection and seating.
- Pressure/temperature (p/T) ratings: Methodology and annexed tables to determine allowable pressure at temperature for listed EN materials (see normative Annexes F and G).
- Marking, inspection & testing: Mandatory marking, stamping, certificates and inspection/testing rules (including welding inspection).
- Ancillary information: Annexes include flange mass tables, calculation basis (Annex E), p/T calculation rules and examples, and material group guidance.
Practical Applications and Users
SIST EN 1092-1:2018 is intended for designers, manufacturers and users of pressure piping systems across industries such as oil & gas, petrochemical, water treatment, power generation and HVAC. Typical use cases:
- Specifying flange components for new piping systems and valve connections.
- Procurement and quality inspection of manufactured flanges and collars.
- Engineering calculations for flange joints (bolting, gasket selection and p/T ratings).
- Ensuring compliance with the EU Pressure Equipment Directive (informative Annex ZA).
Primary users: mechanical and piping engineers, flange and valve manufacturers, fabricators, inspection bodies, procurement teams and standards compliance officers.
Related Standards
- EN 1092 series: Part 2 (Cast iron flanges), Part 3 (Copper alloy flanges), Part 4 (Aluminium alloy flanges).
- ISO 7005 series (historical basis - EN 1092-1 focuses on PN‑based flanges).
- EU Directive 2014/68/EU (Pressure Equipment Directive) - Annex ZA provides relationship to essential requirements.
Keywords: SIST EN 1092-1:2018, steel flanges, PN designated flanges, circular flanges, flange facings, p/T ratings, flange dimensions, flange tolerances, flange marking.
Frequently Asked Questions
SIST EN 1092-1:2018 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges". This standard covers: This European Standard for a single series of flanges specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400 and nominal sizes from DN 10 to DN 4000. This European Standard specifies the flange types and their facings, dimensions, tolerances, threading, bolt sizes, flange jointing face surface finish, marking, materials, pressure/ temperature ratings and approximate flange masses. For the purpose of this European Standard, "flanges" include also lapped ends and collars. This European Standard applies to flanges manufactured in accordance with the methods described in Table 1. Non-gasketed pipe joints are outside the scope of this European Standard.
This European Standard for a single series of flanges specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400 and nominal sizes from DN 10 to DN 4000. This European Standard specifies the flange types and their facings, dimensions, tolerances, threading, bolt sizes, flange jointing face surface finish, marking, materials, pressure/ temperature ratings and approximate flange masses. For the purpose of this European Standard, "flanges" include also lapped ends and collars. This European Standard applies to flanges manufactured in accordance with the methods described in Table 1. Non-gasketed pipe joints are outside the scope of this European Standard.
SIST EN 1092-1:2018 is classified under the following ICS (International Classification for Standards) categories: 23.040.60 - Flanges, couplings and joints. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 1092-1:2018 has the following relationships with other standards: It is inter standard links to SIST EN 1092-1:2007+A1:2013/AC:2014, SIST EN 1092-1:2007+A1:2013, SIST EN 1092-1:2018/oprA1:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 1092-1:2018 is associated with the following European legislation: EU Directives/Regulations: 2014/68/EU, 2014/90/EU, 88/379/EEC, 97/23/EC, EUR-PUB; Standardization Mandates: M/071, M/109. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase SIST EN 1092-1:2018 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flansche und ihre Verbindungen - Runde Flansche für Rohre, Armaturen, Formstücke und Zubehörteile, nach PN bezeichnet - Teil 1: StahlflanscheBrides et leurs assemblages - Brides circulaires pour tubes, appareils de robinetterie, raccords et accessoires, désignées PN - Partie 1 : Brides en acierFlanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges23.040.60Prirobnice, oglavki in spojni elementiFlanges, couplings and jointsICS:Ta slovenski standard je istoveten z:EN 1092-1:2018SIST EN 1092-1:2018en,fr,de01-julij-2018SIST EN 1092-1:2018SLOVENSKI
STANDARDSIST EN 1092-1:2007+A1:2013/AC:2014SIST EN 1092-1:2007+A1:20131DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1092-1
April
t r s z ICS
t uä r v rä x r Supersedes EN
s r { tæ sã t r r y ªA sã t r s uEnglish Version
Flanges and their joints æ Circular flanges for pipesá valvesá fittings and accessoriesá PN designated æ Part
sã Steel flanges Brides et leurs assemblages æ Brides circulaires pour tubesá appareils de robinetterieá raccords et accessoiresá désignées PN æ Partie
sã Brides en acier
Flansche und ihre Verbindungen æ Runde Flansche für Rohreá Armaturená Formstücke und Zubehörteileá nach PN bezeichnet æ Teil
sã Stahlflansche This European Standard was approved by CEN on
t y November
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s r { tæ sã t r s z ESIST EN 1092-1:2018
Wall thickness and end preparation for flanges type 11, 34, 35, 36, 37 and pipe nominal thicknesses for the use with type 01 flanges . 83 A.1 Weld-end preparation for flanges types 11 and 34 . 83 A.2 Weld-end preparation for type 35 . 85 A.3 Weld end preparation for types 36 and 37 . 87 Annex B (informative)
Material groups . 89 Annex C (informative)
Approximate masses of flanges and collars . 91 Annex D (informative)
Additional materials . 101 Annex E (normative)
Basis of flange calculation . 103 E.1 General . 103 E.2 Calculation method . 103 E.3 Basic rules for calculation of flange connection . 103 E.3.1 General . 103 E.3.2 Flanges . 104 E.3.3 Pipes . 104 E.3.4 Bolting/Tightening. 105 E.3.5 Gasket . 105 Annex F (normative)
Determination of p/T ratings . 107 F.1 General . 107 F.1.1 Reference temperature (RT) . 107 F.1.2 Application limits and formulae . 107 F.2 Symbols, descriptions and units. 107 F.2.1 General . 107 F.2.2 p/T ratings for materials with time independent nominal design stress . 108 F.2.3 p/T ratings for materials with time dependent nominal design stress . 108 F.2.4 Reference value for thickness (vR) . 108 F.2.5 Nominal design stresses and safety factors for mean creep rupture strength . 108 F.2.6 Flanges made from steel castings . 109 F.2.7 Rounding of maximum allowable pressure at temperature . 109 Annex G (normative)
p/T ratings for a selection of EN materials . 110 G.1 General . 110 G.1.1 p/T ratings . 110 G.1.2 Basics of determination of p/T ratings (see Annex F) . 110 G.1.3 Application limits for creep range . 110 G.2 Non-austenitic steels . 111 G.2.1 General . 111 G.2.2 List of materials . 112 SIST EN 1092-1:2018
Rings for flanges with groove . 138 Annex I (informative)
Flanges with fixed inner diameter . 139 I.1 General . 139 I.2 Scope . 139 Annex J (informative)
Mating dimensions for flanges with higher DN . 144 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU Pressure Equipment Directive aimed to be covered . 146 Bibliography . 147
electric welded form bars, sectional steel or strip b, c, d, e Pressed from welded or seamless pipes or flat products 01 (Plate flange for welding) yes no yes yes yes no 02 (Loose plate flange for Types 32—37) yes no yes yes yes no 04 (Loose plate flange for Type 34) yes no yes yes yes no 05 (Blind flange) yes no yes yes no no 11 (Weld-neck flange) yes no no yes yes, for
· DN 700 no 12 (Hubbed slip-on flange for welding) yes no no yes no no 13 (Hubbed threaded flange) yes no no yes no no 21 (Integral flange) yes yes no yes no no 32 (Weld-on plate collar) yes no yes yes yes no 33 (Lapped end pipe) yes no yes no yes yes 34 (Weld-neck collar) yes yes no yes yes no 35 (Welding neck) yes no yes yes yes no 36 (Pressed collar with long neck) yes no no no yes yes 37 (Pressed collar) yes no yes yes yes yes
a Seamless rolled, pressed, forged.
b Only one radial weld is allowed under DN 1800. If using cut strips for manufacturing, the through thickness direction of the strip for type 11 and 34 shall be perpendicular to the flange centerline, for Type 01, 02, 04 and 32 in the direction of the flange centreline.
c For welding: see 5.11.
d Welded flanges allowed only for an application up to 370 °C in conformance with EN 13480–3:2002, D.4.4.
e In case flanges are made by cold forming of a base material e.g. flat product, some mechanical properties, like elongation after fracture (A) and impact energy (KV), will be impaired due to cold forming without subsequently heat treatment. 5.2 Repairs by welding With the exception of weld repairs according to 5.11 repairs by welding are permitted only by written agreement of the purchaser. Within the certificate for material or component relevant documents shall be noted, that approved welding procedure and welders qualification (see 5.11) have been applied. 5.3 Bolting Flanges shall be suitable for use with the number and size of bolting as specified in Table 10 to Table 21. The bolting shall be chosen by the equipment manufacturer according to the pressure, temperature, flange material and gasket so that the flanged joint remains tight under the expected operating SIST EN 1092-1:2018
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