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Key points regarding UNI Flange


UNI (Ente Nazionale Italiano di Unificazione) is the Italian National Unification Organization, and UNI flanges are designed and manufactured based on Italian standards. Here are key points regarding UNI flanges:

1. UNI Flange Standards: UNI flanges adhere to standards set by Ente Nazionale Italiano di Unificazione. Common standards for UNI flanges include UNI 2276, UNI 2277, UNI 2280, and UNI 2281.

2. Flange Types: UNI flanges come in various types, including weld neck, slip-on, threaded, socket weld, blind, and lap joint. Each type is designed for specific applications and joining methods.

3. Pressure Ratings: UNI flanges are available in different pressure ratings, such as PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The pressure rating indicates the maximum pressure the flange can withstand at a given temperature.

4. Materials: UNI flanges are manufactured from various materials, including carbon steel, stainless steel, and alloy steel. The choice of material depends on factors such as the application, temperature, and corrosion resistance requirements.

5. Facings: Flange facings are important for sealing. Common facings for UNI flanges include flat face (FF), raised face (RF), and ring-type joint (RTJ). The facing type affects the sealing performance of the flange.

6. Marking and Identification: UNI flanges are typically marked with information such as the manufacturer's name or logo, flange size, pressure rating, material specification, and the UNI standard number.

7. Dimensions: UNI flanges have specific dimensions and sizes, and they are classified based on nominal sizes and nominal pipe sizes (NPS). The flange dimensions are standardized for compatibility.

8. Applications: UNI flanges are used in various industries, including manufacturing, construction, and oil and gas. They are employed in piping systems to connect pipes, valves, and other components.

9. Testing and Quality Control: Manufacturers follow stringent quality control measures and testing procedures to ensure that UNI flanges meet the specified standards. Common tests include hydrostatic testing, visual inspection, dimensional checks, and material testing.

10. Compatibility: UNI flanges are designed to be compatible with other flanges that adhere to the same UNI standard. This interchangeability facilitates the easy replacement or modification of components within a piping system.

It's important to refer to the specific UNI standard documentation for detailed information and specifications based on the particular UNI standard in use.

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