API Std 650 - Flanged Roof Nozzles (mm)

Written by Jerry Ratzlaff. Posted in American Petroleum Institute

American Petroleum Institute (API)

standards

  • API Std 650 - Standard for Welded Tanks for Oil Storage

 

  • [a] Reinforcing plates are not required on nozzles NPS 6 or smaller but may be used if desired.
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 48.3 50 150 125
2 60.3 65 150 175
3 88.9 92 150 225
4 114.3 120 150 275
6 168.3 170 150 375
8 219.1 225 150 450
10 273 280 200 550
12 323.8 330 200 600