Every flange produced has a different face, which is dependent on the application it is used for. The surface area that hosts the gasket is what is known as a flange face. Today, with metals being used across all industrial sectors, there are many different Flange Facing Type & Finish. Some of the more common flange face types include tongue and groove, flat face, raised face, lap joint, Ring joint flange, and lastly, Male and female flange.
These faces are produced with four different finishes. The four Types Of Flange Face Finish include spirally serrated, concentric serrated, stock finish, and a smooth finish. The main purpose of using finishes on the surface of a flange is to determine the level at which a gasket would be able to secure an impervious seal. For instance, a concentric Flange Serrated Finish has an evenly spaced out groove angled at 90° with the use of a specific tool. This finish is specifically designed to meet the requirements of a piping system that ferries across fluids of very low density. Similar to concentric serrated flanges, a spiral Raised Face Serrated Finish uses a tool that marks a groove angled at 45°. On the other hand, a smooth finish flange is where the surface, on visual examinations displays no marking. Hence, this is a Flange Finish Types that are used in a combination of gaskets with metal facings. The metal facings would include a double jacketed, corrugated metal or a flat steel facing. The mating of smooth surfaces creates a seal. Though it is important to note that the smoothness of the opposite face of the mating material will determine the integrity of the seal. The smoother the Flat Face Flange Surface Finish, the better is the formation of the seal between the mating surface and the flange.
ASME/ANSI B 16.5 | Socket Weld, Welding Neck, Lap Joint, Slip on, Blind, High Hub Blind, Threaded, Ring Type Joint Flange |
PRESSURE CLASS | Class 150, 300, 400, 600, 900, 1500, 2500 LBS |
ASME/ANSI B 16.47 | Blind, Welding Neck Flange [Series A & B] |
Pressure Class | Class 75, 150, 300, 400, 600, 900 LBS |
ASME/ANSI B 16.36 | Slip on, Welding Neck, Threaded Flange |
Pressure Class | Class 300, 400, 600, 900, 1500, 2500 LBS |
BS 4504 SEC 3.1 | Welding Neck, Hubbed Slip on, Hubbed Threaded, Lapped Pipe End, Plate, Loose Plate, Loose Plate With Weld Neck, Blank Flange |
Pressure Class | PN 2.5 TO PN6, PN10, PN16, PN25, PN40 |
BS 4504 [PART 1] | Welding Neck, Hubbed Slip-On Hubbed Threaded, Plate, Loose Plate With Weld On Plate Collar, Blank Flange |
Pressure Class | PN 2.5 PN6, PN10, PN16, PN25, PN40 TO PN 400 |
BS 1560 BOSS | Welding Neck, Socket Welding, Slip-On, Blind, Screwed Boss, Lapped Flange |
Pressure Class | Class 150, 300, 400, 600, 900, 1500, 2500 LB |
BS10 | Screwed Boss, Welding Neck, Plate Slip-On, Slip-On Boss, Blind Flange |
TABLE | Table D, Table E, Table F, Table H |
DIN Flanges | DIN 2627, 2634, 2629, 2631, 2655, 2637,2638, 2576, 2633, 2573, 2527, 2566, 2636, 2632, 2656, 2673, 2628, 2635, 2641,2642, |
Pressure Class | PN6, PN10, PN16, PN25, PN40 TO PN 100 |
Nominal Pipe Size | A | B |
---|---|---|
1/2 | 3.0 | 1.5 |
8 | 8.0 | 4.5 |
1 | 3.0 | 1.5 |
1-1/4 | 3.0 | 1.5 |
1-1/2 | 3.0 | 1.5 |
2 | 3.0 | 1.5 |
2-1/2 | 3.0 | 1.5 |
3 | 4.5 | 1.5 |
3/4 | 3.0 | 1.5 |
3-1/2 | 6.0 | 3.0 |
4 | 6.0 | 3.0 |
5 | 6.0 | 3.0 |
6 | 6.0 | 3.0 |
20 | 12.0 | 6.0 |
10 | 8.0 | 4.5 |
12 | 8.0 | 4.5 |
14 | 8.0 | 4.5 |
16 | 10.0 | 4.5 |
18 | 12.0 | 6.0 |
22 | 12.0 | 6.0 |
24 | 12.0 | 6.0 |