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Prime Steel is a leading manufacturer and supplier of Uni Flanges, specializing in providing high-quality and reliable products to meet the diverse needs of industries. With a commitment to excellence, we utilize advanced manufacturing processes and adhere to stringent quality control measures to ensure the precision and durability of its Uni Flanges. Our reputation for delivering top-notch products makes us a trusted partner for businesses seeking dependable Uni Flanges for their projects.
Material Compatibility
Pressure Ratings
Flange Type
Size and Dimensions
Facing and Surface Finish
Standards and Certifications
UNI Standards (Ente Nazionale Italiano di Unificazione)
DN 10 ( 3/8" NPS ) up to DN 4000 ( 160" NPS )
PN6, PN10, PN16, PN25, PN40
Flat Face (FF), Raised Face (RF)
Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel & Super Duplex Steel
Piping Systems, Construction and Infrastructure, Power Generation
The pressure class for UNI flanges is typically denoted by a PN (Pressure Nominal) followed by a numerical value. The specific pressure class depends on the type of UNI flange and the applicable standard. Common pressure classes for UNI flanges include PN6, PN10, PN16, PN25, and PN40. Each pressure class indicates the flange's ability to withstand different levels of pressure.
These pressure classes help users select UNI flanges based on the pressure requirements of their specific piping systems. When choosing UNI flanges, it's important to refer to the specific UNI standard applicable to the type of flange to determine the correct pressure class for the intended application. The choice of pressure class depends on factors such as the working pressure and temperature conditions of the piping system. Always adhere to industry standards and guidelines to ensure the proper selection and use of UNI flanges in a given application.
UNI is a national standards organization in Italy responsible for developing and publishing technical standards across various industries. Uni-Flange is a brand name associated with a specific type of mechanical joint for connecting pipes in water and wastewater applications. Uni-Flange products are commonly used in the water industry for connecting pipes, valves, and fittings in various configurations. These flanges are designed to provide a restrained joint, meaning they help prevent the pipes from separating due to internal pressure or external forces.
"UNI flanges" typically refers to flanges that comply with the standards set by Ente Nazionale Italiano di Unificazione (UNI), which is the Italian National Unification Body responsible for developing and publishing technical standards in Italy. UNI standards cover various industries and products, including flanges used in piping systems. Uni-Flange mechanical joints typically consist of a flange adapter and a ductile iron flange, along with other necessary components such as gaskets and bolts. These joints are often used in water distribution systems, wastewater treatment plants, and other piping systems where a reliable and secure connection is essential.
Mechanical Joint System: Uni-Flange offers a mechanical joint system that typically includes a flange adapter, a ductile iron flange, and other components like gaskets and bolts.
Materials: The components of Uni-Flange products are often made from durable materials, with ductile iron being a common choice. Ductile iron provides strength and durability, making it suitable for various water and wastewater applications.
Applications: Uni-Flange products are commonly used in water distribution systems, wastewater treatment plants, and other piping systems where a reliable and secure connection is crucial. The restrained joints help to prevent pipe movement and separation.
Restraint Systems: The mechanical joint design of Uni-Flange provides restraint against thrust forces and pullout forces, enhancing the overall stability of the pipeline.
Installation: Installation of Uni-Flange products typically involves aligning the pipes, connecting the components, and securing them with bolts. The restrained joint design simplifies the installation process.
Standards and Certifications: Uni-Flange products may adhere to industry standards and certifications, ensuring that they meet specific requirements for performance, safety, and reliability.
UNI flanges come in different types, each designed for specific applications. Some common types of UNI flanges include:
Welding Neck Flanges (UNI EN 1092-1): These flanges are designed for butt-welding to the end of a pipe. They have a long neck that is beveled to match the pipe, providing a smooth flow path.
Threaded Flanges (UNI EN 1092-2): These flanges have internal threads that match the external threads of a pipe. They are often used for low-pressure applications and in smaller pipe sizes.
Blind Flanges (UNI EN 1092-3): Blind flanges are used to seal the end of a pipe. They do not have a bore and are typically used to close off the end of a piping system or vessel.
Slip-On Flanges (UNI EN 1092-1): These flanges have a slightly larger diameter than the pipe, allowing them to slip over the pipe. They are then fillet-welded in place.
UNI 2253 PN6 Threaded Flange: This standard likely specifies dimensions, material requirements, and other characteristics for PN6 threaded flanges. The PN6 indicates a pressure class of 6.
UNI 2254 PN16 Threaded Flange: Similar to UNI 2253 but for PN16 pressure class, indicating a higher pressure tolerance.
UNI 6092 PN10 Blind Flange: This standard likely covers PN10 blind flanges, providing specifications for dimensions, materials, and other relevant characteristics.
UNI 6093 PN16 Blind Flange: Similar to UNI 6092 but for PN16 pressure class, indicating a higher pressure tolerance.
UNI 2277 PN10 Plate Flange: This standard likely specifies dimensions, materials, and other characteristics for PN10 plate flanges.
UNI 2278 PN16 Plate Flange: Similar to UNI 2277 but for PN16 pressure class.
UNI 2281 PN10 Welding Neck Flange: This standard likely covers PN10 welding neck flanges, providing specifications for dimensions, materials, and other relevant characteristics.
UNI 2282 PN16 Welding Neck Flange: Similar to UNI 2281 but for PN16 pressure class.
UNI 2283 PN25 Welding Neck Flange: This standard likely covers PN25 welding neck flanges, providing specifications for dimensions, materials, and other relevant characteristics.
Check UNI Flange Standard Dimensions Download
Connection Point: A UNI flange serves as a connection point between two pipes or between a pipe and another component (e.g., valve, pump). It is welded or bolted onto the end of the pipe, creating a secure attachment.
Surface Sealing: The facing of the flange plays a crucial role in sealing the joint. UNI flanges may have a Raised Face (RF) or Flat Face (FF) surface. The choice depends on factors such as the type of gasket used and the application requirements.
Gasket Placement: A gasket is placed between the facing surfaces of two flanges during assembly. The gasket provides a flexible and compressible material that fills the irregularities in the facing surfaces, ensuring a tight seal.
Bolting or Welding: The flanges are connected either by bolting or welding, depending on the type of flange and the application. Bolting involves tightening a set of bolts and nuts around the flange, compressing the gasket and creating a seal. Welding involves permanently joining the flanges together.
Pressure Resistance: The design and materials of the UNI flange are chosen to withstand the pressure and temperature conditions of the fluid or gas being transported in the piping system. Different pressure classes, such as PN6, PN10, PN16, etc., indicate the flange's capacity to handle specific pressure levels.
Alignment and Support: UNI flanges help align the connected pipes and provide support to prevent sagging or misalignment. Proper alignment is crucial for maintaining the integrity and efficiency of the piping system.
Versatility: UNI flanges are available in various types, such as welding neck, threaded, blind, and slip-on flanges, offering versatility to accommodate different piping configurations and requirements.
Maintenance and Inspection: Flanges allow for easy maintenance and inspection of the piping system. When needed, the flanges can be unbolted or cut for access to the interior of the system.
