What is a UNI Flange?
What is a UNI Flange?
A UNI flange is designed to provide adaptability and ease of installation by allowing connections between pipes of varying materials and dimensions. These flanges are designed to facilitate quick and secure jointing while reducing the need for welding and other complex installation methods.
UNI flanges are particularly useful for repair and maintenance work, as they allow for easy replacement of damaged pipes or components without extensive downtime. They are manufactured in compliance with UNI (Ente Nazionale Italiano di Unificazione) standards, ensuring high quality and reliability in industrial applications.
Benefits of Using UNI Flanges
- Easy Installation: The split design simplifies installation, reducing labor time and costs.
- On-Site Fabrication: UNI flanges eliminate the need for pre-engineered or prefabricated piping systems, allowing for on-site pipe fabrication.
- Eliminates Alignment Problems: The flange can be rotated before tightening, ensuring proper alignment with the mating flange.
- Accommodates Pipe Deflection: UNI flanges can tolerate pipe deflection during installation, making them suitable for challenging environments.
- Built-In End Restraint: UNI flanges offer built-in end restraint, eliminating the need for additional anchoring or tie rods.
- Future Maintenance: UNI flanges can be easily disassembled for maintenance or equipment replacement.
Types of UNI Flanges:
UNI Flange 1300
UNI Flange 1400
UNI Flange 400/900
UNI Flange Standard Specifications
| Category | Details |
| Flange Size Range | 1/2″ NB TO 48″NB |
| Flange Class / Pressure Rating | PN 6, PN 10, PN 16, PN 25, PN 40 |
| Flange Face Types | Raised Face (RF), Flat Face (FF) |
| UNI Standard Cover | UNI 2276, UNI 2277, UNI 2280, UNI 6084, UNI 6109, UNI 6112, UNI 6114 |
| Coating | Anti-rust oil, Zinc-plated, Epoxy Coating, Hot-dip Galvanized |
UNI Flange Dimensions
| Directions for the designation | d1 | a | b | D | f | Holes | Screws | Weight Kg | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Rated Diameter | External diameter of the pipe | Nominal | Tolerance | |||||||
| 15 | 20 | 20,5 | +0,5 | 55 | 10 | 80 | 11 | 4 | M 10 | 0,34 |
| 21,3 | 22 | 0,33 | ||||||||
| 20 | 25 | 25,5 | 65 | 12 | 90 | 11 | 4 | M 10 | 0,51 | |
| 26,9 | 27,5 | 0,50 | ||||||||
| 25 | 30 | 30,5 | 75 | 12 | 100 | 11 | 4 | M 10 | 0,63 | |
| 33,7 | 34 | 0,61 | ||||||||
| 32 | 38 | 38,5 | 90 | 14 | 120 | 14 | 4 | M 12 | 1,09 | |
| 42,4 | 43 | 1,05 | ||||||||
| 40 | 44,5 | 45 | 100 | 14 | 130 | 14 | 4 | M 12 | 1,26 | |
| 48,3 | 49 | 1,23 | ||||||||
| 50 | 57 | 58 | 110 | 14 | 140 | 14 | 4 | M 12 | 1,38 | |
| 60,3 | 61,5 | 1,35 | ||||||||
| 65 | 76,1 | 77 | 130 | 14 | 160 | 14 | 4 | M 12 | 1,68 | |
| 80 | 88,9 | 90 | 150 | 16 | 190 | 18 | 4 | M 16 | 2,63 | |
| 100 | 108 | 109 | +1,0 | 170 | 16 | 210 | 18 | 4*** | M 16 | 3,05 |
| 114,3 | 115,5 | 2,92 | ||||||||
| 125 | 133 | 134,5 | 200 | 18 | 240 | 18 | 8 | M 16 | 4,11 | |
| 139,7 | 141 | 3,90 | ||||||||
| 150 | 159 | 160,5 | 225 | 20 | 265 | 18 | 8 | M 16 | 5,16 | |
| 168,3 | 170 | 4,78 | ||||||||
| 175 | 193,7 | 195,5 | 255 | 22 | 295 | 18 | 8 | M 16 | 6,27 | |
| 200 | 219,1 | 221 | 280 | 22 | 320 | 18 | 8 | M 16 | 6,91 | |
| 250 | 267 | 269 | 335 | 24 | 375 | 18 | 12 | M 16 | 9,53 | |
| 273 | 275 | 9,04 | ||||||||
| 300 | 323,9 | 326 | 395 | 24 | 440 | 22 | 12 | M 20 | 12,1 | |
| 350 | 355,6 | 358 | 445 | 26 | 490 | 22 | 12 | M 20 | 17,0 | |
| 368 | 370,5 | 15,6 | ||||||||
| 400 | 406,4 | 409 | +1,5 | 495 | 28 | 540 | 22 | 16 | M 20 | 20,1 |
| 419 | 422 | 18,3 | ||||||||
| 450 | 457,2 | 460,2 | ±5 | 550 | 28 | 595 | 22 | 16 | M 20 | 25,8 |
| 500 | 508 | 511 | 600 | 30 | 645 | 22 | 20 | M 20 | 30,0 | |
| 600 | 609,6 | 612,6 | 705 | 30 | 755 | 25 | 20 | M 22 | 37,9 | |
| 700 | 711,2 | 714,2 | 810 | 32 | 860 | 25 | 24 | M 22 | 47,9 | |
| 800 | 812,8 | 815,8 | 920 | 34 | 975 | 30 | 24 | M 27 | 62,9 | |
| 900 | 914,4 | 917,4 | 1020 | 36 | 1075 | 30 | 24 | M 27 | 74,6 | |
| 1000 | 1016 | 1019 | 1120 | 36 | 1175 | 30 | 28 | M 27 | 81,9 | |
Application
- Water and Wastewater Systems: Used in municipal water distribution, sewage treatment plants, and irrigation systems.
- Oil and Gas Industry: Facilitates the safe transportation of crude oil, natural gas, and petroleum products in pipelines.
- Chemical and Petrochemical Plants: Ensures secure connections in systems handling corrosive fluids and high-pressure operations.
- Power Generation Plants: Used in cooling water systems and high-temperature steam pipelines.
- Marine and Shipbuilding: Provides reliable pipeline connections in harsh marine environments.
