Different types of flange faces are used as the contact surfaces to seat the sealing gasket material.
The type of flange
|
The type of sealing face
|
Pressure Class(PN,MPA)
|
Plate flange(PL)
|
Raise Face(RF)
|
0.25-2.5
|
Flat Face( FF)
|
0.25-1.6
| |
Slip on flange(SO)
|
Raise Face(RF)
|
0.6-4.0
|
Flat Face( FF)
|
0.6-1.6
| |
male and female face (MFM)
|
1.0-4.0
| |
Tongue and groove face (TG)
|
1.0-4.0
| |
Welding Neck Flange(WN)
|
Raise Face(RF)
|
1.0-25.0
|
male and female face (MFM)
|
1.0-16.0
| |
Tongue and groove face (TG)
|
1.0-16.0
| |
Ring Joint Face(RTJ)
|
6.3-25.0
| |
Flat Face( FF)
|
1.0-1.6
| |
Integral type flange(IF)
|
Raise Face(RF)
|
0.6-25.0
|
male and female face (MFM)
|
1.0-16.0
| |
Tongue and groove face (TG)
|
1.0-16.0
| |
Ring Joint Face(RTJ)
|
6.3-25.0
| |
Flat Face( FF)
|
0.6-1.6
| |
Socket Weld Flange(SW)
|
Raise Face(RF)
|
1.0-10.0
|
male and female face (MFM)
|
1.0-10.0
| |
Tongue and groove face (TG)
|
1.0-10.0
| |
Thread Flange(Th)
|
Raise Face(RF)
|
0.6-4.0
|
Flat Face( FF)
|
0.6-1.6
| |
Lap joint Flange(LP)
|
Raise Face(RF)
|
0.6-1.6
|
male and female face (MFM)
|
1.0-1.6
| |
Tongue and groove face (TG)
|
1.0-1.6
| |
Blind flange(BL)
|
Raise Face(RF)
|
0.25-25.0
|
male and female face (MFM)
|
1.0-16.0
| |
Tongue and groove face (TG)
|
1.0-16.0
| |
Ring Joint Face(RTJ)
|
6.3-25.0
| |
Flat Face( FF)
|
0.25-1.6
|
Other flange facings covered by these standards include the large and small tongue-and-groove facings, and the ring joint facing specifically for ring joint type metal gaskets.
