In industrial piping systems, international standards ensure consistency, safety, and compatibility for flange connections. One of the most widely adopted European flange standards is EN 1092. This standard defines the dimensions, tolerances, pressure ratings, and surface finishes for various flange types used in industrial pipelines across the European Union (EU) and beyond.
This article provides a comprehensive explanation of the EN 1092 flange standard, the types of flanges it encompasses, and its significance in today’s engineering and manufacturing industries.
Sunjin Metals Vina (SJM Vina), is a trusted supplier of high-quality steel pipes, flanges, and fittings sourced from South Korea and other countries, fully compliant with international standards.
What is EN 1092?
EN 1092 is a European Standard that specifies requirements for circular flanges made from materials such as steel, stainless steel, aluminum, and copper alloys. It applies to flanges used in pipes, valves, fittings, and pressure vessels, primarily in industrial systems transporting liquids and gases.
The full designation, EN 1092-1, focuses specifically on steel flanges. Developed by the European Committee for Standardization (CEN), it aims to harmonize flange specifications across Europe.
SJM Vina provides EN 1092-compliant products with precise manufacturing and full traceability for international projects.
Why EN 1092 Matters
In industrial piping systems, flange compatibility is critical. Mismatched flanges in terms of dimensions or pressure ratings significantly increase the risk of leaks, failures, and safety hazards.
Adhering to EN 1092 ensures:
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Interchangeability of parts across European and global projects.
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Reliable sealing under pressure.
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Standardized design, minimizing engineering errors.
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Compliance with EU regulations for pressure equipment.
EN 1092 is widely used in industries such as oil and gas, water treatment, chemical processing, shipbuilding, and pharmaceuticals.
Types of Flanges in EN 1092
EN 1092-1 includes several flange types, identified by short codes:
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Type 01: Plate flange.
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Type 02: Loose plate flange with weld-on plate collar.
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Type 05: Blind flange.
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Type 11: Weld neck flange.
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Type 12: Hubbed slip-on flange.
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Type 13: Threaded flange.
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Type 21: Integral flange.
Each type serves a specific function in the pipeline, with the choice depending on factors like pressure, fluid type, connection method, and temperature range.
SJM Vina offers all standard EN 1092 flange types, customizable in various pressure classes and materials.
Pressure Ratings in EN 1092
EN 1092 flanges are available in several pressure classes, referred to as PN (Pressure Nominal):
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PN 6
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PN 10
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PN 16
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PN 25
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PN 40
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PN 63 / 100 / 160 / 250 / 400 (for high-pressure systems)
The PN rating indicates the maximum allowable pressure at a reference temperature. For example, a PN 16 flange is rated for 16 bar pressure at 20°C.
Selecting the correct PN class is crucial for system safety and efficiency. SJM Vina provides technical support to help customers choose the appropriate flange based on application needs.
Dimensions and Surface Finishes
EN 1092 specifies detailed flange dimensions, including:
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Outer diameter.
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Bolt circle diameter.
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Number and size of bolt holes.
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Flange thickness.
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Raised face height.
The standard also defines surface finish requirements to ensure a proper gasket seal. The sealing face can be:
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Raised Face (RF).
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Flat Face (FF).
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Tongue and Groove (T&G).
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Male and Female (M&F).
A typical finish for a Raised Face flange under EN 1092 is a serrated concentric or spiral groove, providing effective gasket grip and sealing performance.
All SJM Vina products adhere to strict surface finish tolerances as per EN 1092 to ensure leak-free operation.
Marking and Certification
Flanges under EN 1092 must be clearly marked with essential information, such as:
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Manufacturer identification.
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EN 1092 designation.
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Pressure class (PN).
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Material grade.
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Heat number or batch code.
This ensures full traceability and compliance with the European Pressure Equipment Directive (PED) and other industrial requirements.
SJM Vina provides EN 10204 3.1 or 3.2 inspection certificates upon request, offering confidence to buyers and inspectors.
EN 1092 vs. Other Standards
EN 1092 is the European equivalent to standards such as:
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ASME B16.5 in the United States.
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BS 4504 (now largely replaced by EN 1092 in the UK).
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JIS B2220 in Japan.
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GOST standards in Russia.
While functionally similar, these standards differ in dimensions, tolerances, and bolt patterns. Compatibility between standards must be verified when exporting or importing equipment.
As a globally oriented manufacturer, SJM Vina offers flanges compliant with EN, ASME, and other international standards, facilitating seamless integration in global supply chains.
Applications of EN 1092 Flanges
EN 1092 flanges are used in various systems, including:
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Water supply and sewage.
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Chemical processing plants.
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Heating and cooling pipelines.
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Fire protection systems.
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Pharmaceutical and food-grade systems.
Their standardization ensures safe, leak-proof, and reliable connections in both low- and high-pressure environments.
Conclusion
The EN 1092 flange standard is critical for ensuring safety, efficiency, and compatibility in industrial piping systems across Europe and beyond. From weld neck to blind flanges, and from PN 6 to PN 400 ratings, this standard provides a clear framework for manufacturers, engineers, and end users.
Sunjin Metals Vina proudly offers a comprehensive range of EN 1092-compliant flanges manufactured to the highest quality standards. With certified materials, precision machining, and global shipping capabilities, SJM Vina is your trusted partner for flange solutions. Contact us at +84 33 4233 127 or via email at sjmvina@sunjinmetal.com. Visit www.sjmvina.com.vn for more information and to place your order today!
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