API Std 650 - Roof Manholes (mm)
American Petroleum Institute (API)
standards
- API Std 650 - Standard for Welded Tanks for Oil Storage
- [a] Pipe may be used for neck, providing the minimum nominal wall thickness is 1/4 in. (\(ID\) and \(D_P\) shall be adjusted accordingly.)
API Std 650 - Roof Manholes (mm) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Size
of Manhole (NPS) | Diameter
of Neck [a]
\(ID\) | Diameter
of Cover Plate
\(D_C\) | Diameter
of Bolt Circle | Number
of Bolts
\(D_B\) | Diameter
of Gasket Inside | Diameter
of Gasket Outside | Diameter of
Hole in Roof Plate or Reinforcing Plate \(D_P\) | Outside
Diameter of Reinforcing Plate
|
| 500 | 500 | 650 | 590 | 16 | 500 | 650 | 515 | 1050 |
| 600 | 600 | 750 | 690 | 20 | 600 | 750 | 615 | 1150 |
