ISO Standard Flange

What is ISO Flange?

The term "ISO Flange" can refer to flanges that comply with the standards set by the International Organization for Standardization (ISO). ISO has established various standards for flanges used in industrial applications to ensure consistency, compatibility, and safety. ISO flanges conform to these standards, which cover aspects such as dimensions, materials, face types, pressure and temperature ratings, and more.

When referring to an "ISO flange," it's essential to specify the particular ISO standard or type of flange to ensure clarity. The ISO standards ensure that flanges manufactured by different suppliers are compatible and can be used interchangeably within specified parameters. Always consult the relevant ISO standard documentation for detailed information and specifications when working with ISO flanges.

Standards of ISO Flange

1. ISO 7005-1 Flange: This standard provides dimensions and tolerances for metal flanges used in general industrial piping applications. It covers various types of flanges, including welding neck, slip-on, threaded, and blind flanges, with different pressure ratings and face types.

2. ISO 7005-2 Flange: Part 2 of ISO 7005 focuses on cast iron flanges, providing specifications for flanges with specific dimensions, face types, and pressure ratings.

3. ISO 2084 Flange: This standard pertains to non-metallic flat gaskets used with steel flanges in piping systems. It specifies the dimensions and tolerances for these gaskets to ensure proper sealing.

4. ISO 6162-1 and ISO 6162-2 Flange: These standards define the flange connections used in hydraulic systems, known as SAE flanges. ISO 6162-1 covers flanges for pressures up to 35 MPa (5,000 psi), while ISO 6162-2 covers higher-pressure flanges up to 42 MPa (6,000 psi).

5. ISO 1609 Flange: This standard provides guidelines for the selection of flange facings to ensure proper gasket seating and sealing in flanged joints.

6. ISO 6182-1Flange : This standard addresses the requirements for the design and testing of flanged steel pressure relief valves.

7. ISO 2531 Flange : While primarily focused on ductile iron pipes, ISO 2531 also includes specifications for flanged joints used in the connection of pipes.

ISO 7005-1 Flanges (Metal FLanges)

1. Flange Types: ISO 7005-1 covers several types of flanges commonly used in industrial piping systems. These include welding neck flanges (WN), slip-on flanges (SO), threaded flanges (TH), blind flanges (BL), and plate flanges (PL).

2. Size Range : Typically available in sizes ranging from DN 10 (NPS 3/8) to DN 4000 (NPS 160) or larger.

3. Pressure Classes (PN): ISO 7005-1 defines pressure classes, denoted as PN (Pressure Nominal), which indicate the maximum allowable working pressure at various temperatures. Common pressure classes include PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, and PN 400.

4. Materials: The standard may provide information about acceptable materials for flanges based on factors such as pressure, temperature, and the nature of the fluids or gases being transported.

5. Dimensions and Tolerances: ISO 7005-1 specifies the dimensions and tolerances for the different types of flanges to ensure compatibility and interchangeability between components manufactured by different suppliers.

ISO K Flanges (Vacuum Flanges)

1. Geometry and Design: ISO-K flanges have a standardized geometry with a flat and smooth surface. The design includes through holes for bolts, ensuring compatibility and interchangeability between components from different manufacturers.

2. Vacuum Sealing: ISO-K flanges are designed for effective vacuum sealing. The flat flange face allows for the use of elastomer O-rings or gaskets, creating a vacuum-tight seal when compressed between flange surfaces during assembly.

3. Size Range : Common sizes range from NW10 (10 mm) to NW1000 (1000 mm) and above.

4. Pressure Ratings: High Vacuum (HV): This class is suitable for pressures in the range of 1 x 10^5 Pa (1000 mbar) down to approximately 1 x 10^-3 Pa (0.00001 mbar). Ultra-High Vacuum (UHV): This class is designed for pressures below 1 x 10^-3 Pa (0.00001 mbar) down to the extreme high vacuum range.

5. Standard: ISO-K flanges adhere to the ISO 1609 standard, which provides guidelines for selecting flange facings to ensure proper gasket seating and sealing in flanged joints.

6. Materials: ISO-K flanges are often manufactured from materials with low outgassing characteristics to minimize contamination in vacuum systems. Common materials include stainless steel and aluminum.

ISO F Flanges (Vacuum Flanges)

1. Geometry and Design: ISO-F flanges have a specific geometry with a flat, smooth surface and a bolt hole pattern designed for effective sealing and ease of assembly. The design is standardized to ensure compatibility and interchangeability between components from different manufacturers.

2. Vacuum Sealing: ISO-F flanges are designed for effective vacuum sealing. The flat flange face allows for the use of elastomer O-rings or gaskets, creating a vacuum-tight seal when compressed between flange surfaces during assembly.

3. Size Range : Standard sizes often range from DN 10 (NPS 3/8) to DN 630 (NPS 24) or larger.

4. Pressure Ratings: High Vacuum (HV): Suitable for pressures in the range of 1 x 10^5 Pa (1000 mbar) down to approximately 1 x 10^-3 Pa (0.00001 mbar). Ultra-High Vacuum (UHV): Designed for pressures below 1 x 10^-3 Pa (0.00001 mbar) down to the extreme high vacuum range.

5. Standard: ISO-F flanges adhere to the ISO 1609 standard, which provides guidelines for selecting flange facings to ensure proper gasket seating and sealing in flanged joints.

6. Materials: ISO-F flanges are often manufactured from materials with low outgassing characteristics to minimize contamination in vacuum systems. Common materials include stainless steel and aluminum.

ISO 6162 Flanges (Hydraulic Flanges)

1. Types of Flanges:

   • ISO 6162 defines two main types of hydraulic flanges:
     • ISO 6162-1: This part of the standard covers flanges for use with light-duty applications.
     • ISO 6162-2: This part of the standard covers flanges for use with heavy-duty applications.

2. Pressure Classes:

   • ISO 6162 flanges are specified with a Pressure Nominal (PN) designation, indicating the maximum allowable working pressure. Common pressure classes include PN 25, PN 35, PN 40, PN 50, and PN 60.

3. Nominal Sizes (NS) and Nominal Pipe Sizes (NPS):

   • Flanges are categorized by nominal sizes (NS) and nominal pipe sizes (NPS). The sizes typically range from NS 10 to NS 65 or NPS 1/2 to NPS 3, depending on the specific type and part of the standard.

4. Flange Faces and Sealing:

   • ISO 6162 flanges are designed to ensure proper sealing in hydraulic systems. The flange faces may have a flat face (FF) or a convex face with an O-ring groove for optimal gasket seating.

5. Bolt Hole Patterns:

   • The standard specifies the arrangement of bolt holes on the flange, contributing to the ease of assembly and ensuring compatibility between components.

6. Materials:

   • ISO 6162 flanges are commonly made from materials suitable for hydraulic applications, such as carbon steel or stainless steel. The choice of material depends on factors like system requirements and operating conditions.

7. Applications:

   • ISO 6162 flanges are used in various hydraulic systems, including industrial machinery, construction equipment, and other applications where reliable connections between hydraulic components are essential.

8. International Standard:

   • ISO 6162 is an international standard, which means that it provides guidelines for hydraulic flanges that are recognized and accepted globally. Adhering to this standard ensures compatibility and interchangeability between components from different manufacturers.