standards
- API Std 650 - Standard for Welded Tanks for Oil Storage
API Std 650 - Flanged Roof Nozzles (in)
| ||||
|---|---|---|---|---|
| Nozzle
(NPS) | Outside
Diameter of Pipe Neck | Diameter of
Hole in Roof Plate or Reinforcing Plate \(D_P\) | Minimum
Height of Nozzle
\(H_R\) | Outside
Diameter of Reinforcing Plate [a]
\(D_R\) |
| 1 1/2 | 1.90 | 2 | 6 | 5 |
| 2 | 2 3/8 | 2 1/2 | 6 | 7 |
| 3 | 3 1/2 | 3 5/8 | 6 | 9 |
| 4 | 4 1/2 | 4 5/8 | 6 | 11 |
| 6 | 6 5/8 | 6 3/4 | 6 | 15 |
| 8 | 8 5/8 | 8 7/8 | 6 | 18 |
| 10 | 10 3/4 | 11 | 8 | 22 |
| 12 | 12 3/4 | 13 | 8 | 24 |
