Raised Face Flanges
Technology brief:
ASME B16.5 Raised Face Flanges
Materia:
ASTM / ASME A/SA 105 ASTM / ASME A 350, ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706
Size:
1/2″ (15 NB) to 48″ (1200NB) or custom
Production Description
A Raised Face (RF) flange is the most common type of pipe flange used in process industries, featuring a small, elevated surface (or “raised face”) around the pipe bore above the bolt circle. This design concentrates bolt pressure onto a smaller gasket area, creating a stronger, tighter seal compared to flat-faced flanges.
| Dimensions | ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings |
| Size | 1/2″ (15 NB) to 48″ (1200NB) |
| Class | 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc. |
| DIN | DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673 |
| BS | BS4504 , BS4504, BS1560, BS10 |
| Coating/Surface Treatment | Antirust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized |
| Flange Face Type | Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Value Added Services | CNC Machining, Customised Flanges |
Standard Specification for Raised Face Flanges
Dimensions : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Size : 1/2″ (15 NB) to 48″ (1200NB)
Class: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
Flange Face Type: Flat Face (FF), Raised Face (RF)
Material & Grades of Raised Face Flanges :
Carbon Steel Raised Face Flanges :
ASTM / ASME A/SA 105 ASTM / ASME A 350, ASTM A 181 LF 2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706
Stainless Steel Raised Face Flanges :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Low Temperature Carbon Steel Raised Face Flanges: ASTM A350, LF2, LF3
Alloy Steel Raised Face Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Key Characteristics and Uses Design:
The sealing face is raised above the bolting circle plane by roughly 1/16 inch for lower pressure classes and 1/4 inch for higher classes.
Purpose: The raised surface creates higher pressure on the gasket, increasing the sealing strength and pressure containment capability.
Applications: Widely used in oil & gas, petrochemical, water and sewage, and power generation industries for piping systems, valves, and equipment.
Gaskets: Suitable for use with flat ring sheet gaskets, spiral wound gaskets, and double-jacketed gaskets.
Standards: Defined by ASME B16.5 and ASME B16.47 standards
Raised Face vs. Other
- FacesFlat Face (FF): Typically used for lower-pressure applications (like cast iron) where the entire face is flat, requiring a full-face gasket.
- Ring Type Joint (RTJ): Specifically for high-pressure, severe, or high-temperature applications where a metal ring is used as a seal, sometimes utilizing a specially machined groove within a raised face.
Raised Face Flanges vs Flat Face Pipe Flanges
Raised Face Flange Pressure Ratings
| Flanges pressure rating in psig for Raised Face Flange ASME | |||||||
| Temperature (F°) | 150# | 300# | 400# | 600# | 900# | 1500# | 2500# |
| -20 to 100 | 285 | 740 | 985 | 1480 | 2220 | 3705 | 6170 |
| 200 | 260 | 680 | 905 | 1360 | 2035 | 3395 | 5655 |
| 300 | 230 | 655 | 870 | 1310 | 1965 | 3270 | 5450 |
| 400 | 200 | 635 | 845 | 1265 | 1900 | 3170 | 5280 |
| 500 | 170 | 605 | 805 | 1205 | 1810 | 3015 | 5025 |
| 600 | 140 | 570 | 755 | 1135 | 1705 | 2840 | 4730 |
| 650 | 125 | 550 | 730 | 1100 | 1650 | 2745 | 4575 |
| 700 | 110 | 530 | 710 | 1060 | 1590 | 2655 | 4425 |
| 750 | 95 | 505 | 675 | 1015 | 1520 | 2535 | 4230 |
| 800 | 80 | 410 | 550 | 825 | 1235 | 2055 | 3430 |
| 850 | 65 | 320 | 425 | 640 | 955 | 1595 | 2655 |
| 900 | 50 | 230 | 305 | 460 | 690 | 1150 | 1915 |
| 950 | 35 | 135 | 185 | 275 | 410 | 685 | 1145 |
| 1000 | 20 | 85 | 115 | 170 | 255 | 430 | 715 |
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