API Std 650 - Roof Manholes (mm)

API Std 650 - Roof Manholes (mm)

• [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.)

of

Manhole

(NPS)

of

Neck [a]

\(ID\)

of

Cover

Plate

\(D_C\)

of

Bolt

Circle

of

Bolts

\(D_B\)

of

Gasket

Inside

of

Gasket

Outside

Hole in Roof

Plate or

Reinforcing

Plate

\(D_P\)

Diameter of

Reinforcing

Plate

\(D_R\)