API Std 650 - Roof Manholes (mm)

Written by Jerry Ratzlaff on . Posted in American Petroleum Institute

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.)
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


\(D_R\)

500 500 650 590 16 500 650 515 1050
600 600 750 690 20 600 750 615 1150