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Figure-8 blank
Figure-8 blank
Description
Compilation method for type of insert plate, pad ring and 8 word blind plate for pipeline.
The type marking of steel insert plate, gasket ring and 8 character blind plate for pipeline shall comply with the provisions of table 1.
Table 1 type marking of steel insert plates, gasket rings and figure 8 blind plates for pipelines
| Type | Code name |
| Paddle spacer | BLB |
| Ring gasket | BLS |
| Figure-8 blank | BLF |
Table 2 Seal Surface Type Code Marking
| Sealing surface type | Code name |
| The plane | FF |
| Concave and convex surface | MFM |
| Grooved surface | TG |
| RTJ | RJ |
Note: The sealing face code FF is suitable for flanges with flat and convex sealing faces.
Table 3 Surface roughness of the sealing surface
| Sealing surface | Ra/μm | ||
| Type | Code name | The minimum | The biggest |
| The plane | FF | 3.2 | 6.3 |
| Concave and convex surface | MFM | 3.2 | 6.3 |
| Tongue and groove surface | TG | 0.8 | 3.2 |
| Ring connection surface | RJ | 0.4 | 1.6 |