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
- Publication Date
- 10-Apr-2018
- Withdrawal Date
- 30-Oct-2018
- Technical Committee
- CEN/TC 74 - Flanges and their joints
- Drafting Committee
- CEN/TC 74/WG 2 - Steel flanges
- Current Stage
- 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
- Start Date
- 02-Dec-2023
- Completion Date
- 02-Dec-2023
Relations
- Effective Date
- 18-Apr-2018
- Effective Date
- 14-Nov-2012
- Effective Date
- 24-Oct-2018
- Effective Date
- 07-Nov-2012
Overview
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
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: 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
EN 1092-1:2018 is a standard published by the European Committee for Standardization (CEN). 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.
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.
EN 1092-1:2018 has the following relationships with other standards: It is inter standard links to EN 1092-1:2007+A1:2013/AC:2014, EN 1092-1:2007+A1:2013, EN 1092-1:2018/prA1, EN 1092-1:2007. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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; 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.
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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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The standard EN 1092-1:2018 offers comprehensive guidelines that play a crucial role in the standardization of circular steel flanges used in various industrial applications, specifically for pipes, valves, fittings, and accessories under PN designations ranging from PN 2.5 to PN 400. The scope of this European Standard is both extensive and well-defined, covering nominal sizes from DN 10 to DN 4000, ensuring a wide range of applicability across different systems and configurations. One of the key strengths of EN 1092-1:2018 is its detailed specification of flange types and their facings, which aids manufacturers and users in achieving consistent and reliable performance in flange connections. The inclusion of precise dimensions, tolerances, and threading ensures that the flanges can be effectively integrated into existing piping systems, while the specification of bolt sizes improves assembly practices and enhances operational safety. Furthermore, the standard outlines the importance of flange jointing face surface finish and includes essential requirements for marking, materials, pressure/temperature ratings, and approximate flange masses. This thoroughness not only helps in maintaining quality control during manufacturing but also ensures that end-users can make informed decisions when selecting flanges for specific applications, thereby enhancing operational reliability. While EN 1092-1:2018 primarily concentrates on gasketed pipe joints, it is noteworthy that it explicitly excludes non-gasketed pipe joints, which clarifies its applicability and sets clear boundaries for users. This focus enhances its relevance and ensures that the standard serves its intended purpose effectively within the designated scope. In summary, the EN 1092-1:2018 standard stands out for its detailed approach to defining the requirements and specifications for steel flanges, contributing to better consistency, safety, and performance in industrial applications. Its relevance in contemporary engineering practices cannot be overstated, as it facilitates the seamless integration of components essential for the efficient operation of fluid transport systems.
SIST EN 1092-1:2018は、円形フランジに関する標準化文書であり、パイプ、バルブ、継手、およびアクセサリーに使用される鋼製フランジの要件を示しています。この標準の範囲は、PN指定のPN 2.5からPN 400まで、また、名目サイズはDN 10からDN 4000までのフランジにまで及びます。 この標準の強みは、フランジの種類やその面取り、寸法、許容差、ねじ、ボルトサイズ、フランジ接合面の表面仕上げ、マーキング、材料、圧力/温度評価、そしておおよそのフランジ質量など、詳細かつ包括的な要件を明確に定義している点です。これにより、製品の一貫性と信頼性が向上し、異なる製造者間での製品互換性が確保されます。 さらに、この標準では、フランジの製造方法に関する基準がTable 1で示されており、具体的な製造プロセスを遵守することで、高品質のフランジを提供することができます。また、フランジには、ラップエンドやコラ―も含まれ、広範囲な用途への適用が可能です。 非ガスケット付きのパイプジョイントはこの標準の適用外であるため、特定の用途におけるガスケットの必要性については注意が必要です。全体として、SIST EN 1092-1:2018は、鋼製フランジの標準化において重要な役割を果たし、業界全体における安全性と効率性の向上に寄与しています。
La norme EN 1092-1:2018 fournit un cadre exhaustif pour les flanges en acier circulaires utilisées dans les systèmes de tuyauterie, les vannes, les raccords et les accessoires, avec des désignations de pression nominale (PN) allant de PN 2,5 à PN 400 et des tailles nominales allant de DN 10 à DN 4000. La portée de cette norme européenne est clairement définie, établissant des exigences précises concernant les types de flanches, leurs faces, dimensions, tolérances, filetage, tailles de boulons, finition de surface des joints de flanges, marquage, matériaux, ainsi que les brins de pression/température et les masses approximatives des flanges. Parmi ses points forts, cette norme assure une uniformité dans la fabrication et l'utilisation des flanges, ce qui est crucial pour garantir la compatibilité et la sécurité dans les systèmes sous pression. La spécification exhaustive des dimensions et des tolérances permet une meilleure prévisibilité lors de l'assemblage et contribue à minimiser les problèmes liés aux fuites et aux défaillances d'équipement. De plus, en incluant également les extrémités à recouvrement et les colliers dans la définition de « flanges », la norme élargit son applicabilité et sa pertinence. La norme EN 1092-1:2018 est essentielle pour les acteurs de l'industrie, car elle offre une référence claire qui facilite la compréhension des standards de qualité attendus. Bien qu'elle exclue les joints de tuyaux non-étanchés, le cadre qu'elle établit reste pertinent pour la majorité des applications industrielles nécessitant des flanges en acier. En définitive, la norme renforce la cohérence et la sécurité dans la conception et l'assemblage des composants de tuyauterie, contribuant ainsi à l'efficacité opérationnelle des installations industrielles.
Die Norm EN 1092-1:2018 bietet eine umfassende und präzise Regelung für die Herstellung und den Einsatz von kreisförmigen Stahlflanschen in der Rohrleitungs- und Armaturenindustrie. Der Geltungsbereich dieser Europäischen Norm ist klar definiert und umfasst Flansche mit PN-Bezeichnungen von PN 2,5 bis PN 400 sowie Nenngrößen von DN 10 bis DN 4000. Diese Festlegungen sind entscheidend für die Standardisierung von Flanschlösungen, die in technischen Anwendungen verwendet werden. Die Stärken der Norm liegen in ihrer detaillierten Spezifikation der Flanschtypen und deren Vorderflächen, Dimensionen, Toleranzen und Gewinde. Darüber hinaus werden die erforderlichen Schraubengrößen und die Oberflächenbeschaffenheit der Flanschverbindungsflächen präzise festgelegt. Diese detaillierten Anforderungen garantieren, dass die hergestellten Flansche sowohl in Bezug auf die Qualität als auch auf die Funktionalität den industriellen Standards entsprechen. Ein weiterer relevanter Aspekt dieser Norm ist die Berücksichtigung der Materialien, Druck- und Temperaturwerte sowie der ungefähren Flanschmassen. Solche Informationen sind von zentraler Bedeutung für Ingenieure und Techniker, die sicherstellen müssen, dass die Flansche den jeweiligen Betriebsbedingungen gewachsen sind. Die Norm berücksichtigt auch, dass „Flansche“ im weiteren Sinne auch überlappende Enden und Kragen umfassen, was die Anwendbarkeit der Norm erweitert und somit die Einsatzmöglichkeiten erhöht. Darüber hinaus hebt die Norm die Notwendigkeit hervor, Flansche nur nach den in Tabelle 1 beschriebenen Methoden herzustellen, was für eine einheitliche Qualitätssicherung unerlässlich ist. Es ist wichtig zu betonen, dass nicht-gasketierte Rohrverbindungen nicht im Anwendungsbereich dieser Norm enthalten sind, was die Klarheit und Präzision des Vorschriftenrahmens unterstreicht. Insgesamt stellt die EN 1092-1:2018 eine bedeutende Grundlage für die Spezifizierung und Standardisierung von Stahlflanschen in der Industrie dar. Die Norm trägt entscheidend zur Verbesserung der Sicherheit und des Betriebs von Rohrleitungssystemen bei und stellt sicher, dass alle Komponenten miteinander kompatibel sind, was für die Effizienz und Langlebigkeit von Rohrsystemen von hoher Relevanz ist.
SIST EN 1092-1:2018 표준은 파이프, 밸브, 피팅 및 부속품을 위한 원형 플랜지의 요구 사항을 명확하게 규정하고 있습니다. 이 표준은 PN 2.5에서 PN 400까지의 PN 지정 및 DN 10에서 DN 4000까지의 정격 크기를 포함하여, 다양한 산업적 적용을 위한 강철 플랜지의 종합적인 기준을 제시합니다. 이 표준의 강점은 다양한 플랜지 유형과 그 표면 마감, 치수, 허용 오차, 나사산, 볼트 크기 등의 세부 사항을 명시적으로 규명함으로써, 제조업체와 사용자 간의 공통된 이해를 도출할 수 있다는 점입니다. 또한 플랜지 조인트의 접합면 표면 마감과 재질, 압력 및 온도 등급에 대한 명확한 지침을 제공함으로써, 안전하고 안정적인 조인트를 위한 기준을 설정합니다. EN 1092-1:2018 표준은 롭드 엔드 및 칼라를 포함하여 ‘플랜지’의 정의를 확장함으로써 전반적인 적용 범위를 넓혔습니다. 이는 사용자가 풍부한 선택지를 갖출 수 있도록 하며, 다양한 산업 환경에서의 요구를 충족시키는 데 기여합니다. 비가스켓 파이프 조인트는 이 표준의 적용 범위에서 제외되지만, 이로 인해 표준이 밀접하게 관련된 플랜지 어플리케이션에 집중할 수 있는 기회를 마련합니다. 전체적으로 SIST EN 1092-1:2018 표준은 강철 플랜지를 생산하고 사용하는 모든 관련 주체에게 필수적인 지침을 제공하며, 안전하고 효율적인 운영을 보장하는 데 중요한 역할을 합니다.
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