EN 1092-1 Flanges Suppliers

EN 1092-1 classifies flanges into various Type Codes, each representing a specific design configuration suited for different piping applications. These codes help buyers and engineers identify the exact flange required based on connection method, facing, and mounting technique.

Here’s a quick breakdown:

1. Type 01 – Weld Neck Flange: Designed for high-pressure applications; welded directly to pipe necks to ensure structural integrity and stress distribution.
2. Type 05 – Blind Flange: Used to close the end of piping systems; ideal for inspection or isolation.
3. Type 11 – Slip-On Flange: Slides over the pipe; easier to install but lower pressure rating than weld neck types.
4. Type 13 – Threaded Flange: Screwed into male-threaded pipes; best suited for low-pressure, non-welded systems.
5. Type 21 & 34 – Loose Flanges: Used with stub ends or lapped joints; excellent for corrosion-prone systems or where frequent dismantling is required.
6. Type 36 – Integral Flange: A forged piece machined to form part of valves or equipment; offers enhanced strength.

Tip for Engineers: Always refer to EN 1092-1 Table 1 for selecting the correct flange type based on the nominal size (DN), pressure rating (PN), and face finish.

In the EN 1092-1 standard, PN (Pressure Nominale) refers to the pressure rating of a flange, expressed in bars. The PN rating indicates the maximum allowable operating pressure at a reference temperature of 20°C (68°F). Unlike ASME flange classes, EN flanges follow a metric pressure system.

Common PN Ratings Include:

• PN6 – For low-pressure systems (e.g., water supply lines).
• PN10 / PN16 – Standard for general-purpose piping.
• PN25 / PN40 – For higher pressure industrial systems, including steam and process piping.

Important Considerations:

• The pressure-temperature relationship varies depending on the material group of the flange (e.g., carbon steel vs stainless steel).
• Bolt pattern, thickness, and dimensions increase with higher PN ratings.
• Gasket selection must match the PN rating and face type to ensure sealing performance.

Note: Always consult EN 1092-1 Annex G or pressure/temperature rating charts to ensure compatibility with your piping system and operating conditions.

The face finish of an EN 1092-1 flange is crucial for ensuring a reliable, leak-proof seal between the flange and gasket. Surface roughness directly affects how the gasket compresses and seals under pressure.

Standard Face Finish Types for EN 1092-1:

1. Stock Finish (Serrated Spiral):
   • Roughness: Typically 3.2 – 12.5 µm (Ra)
   • Most commonly used for metallic and soft gaskets
   • Provides good grip to hold the gasket in place
2. Smooth Finish (Flat Smooth Face):
   • Roughness: ≤ 3.2 µm (Ra)
   • Used with soft non-metallic gaskets
   • Requires higher bolt load for effective sealing
3. Concentric Serrated Finish:
   • Similar to spiral but with concentric grooves
   • Preferred in some applications with softer gaskets

Why it matters:

• A mismatch between face finish and gasket material can lead to leakage.
• Proper finish improves gasket compression, especially under fluctuating pressure or thermal conditions.
• EN 1092-1 specifies surface roughness based on gasket type and PN rating.

Always ensure flange face finish complies with EN 1092-1 Clause 6.7 to meet sealing performance expectations.

Nutech Overseas is a trusted global supplier of EN 1092-1 standard flanges, exporting to over 40 countries with full documentation and quality certifications. Our products comply with European standards and are widely used in infrastructure, oil & gas, chemical, and water treatment industries.

Key Export Destinations Include:

1. USA
2. Europe: Germany, Spain, Italy, Poland, Netherlands, France, Romania, Czech Republic
3. Middle East: UAE, Saudi Arabia, Oman, Kuwait, Qatar, Bahrain, Iraq
4. Africa: Egypt, Nigeria, South Africa, Morocco
5. Southeast Asia: Singapore, Indonesia, Malaysia, Vietnam, Thailand, Philippines
6. South America: Brazil, Chile, Argentina
7. Other Regions: Australia, Turkey, South Korea

All flanges are supplied with EN 10204 3.1/3.2 certificates, dimensional test reports, and proper export packaging, ensuring safe delivery and international compliance.