API Std 650 - Shell 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

flanged fitting

Size of

Nozzle

(NPS)

Outside

Diameter

of Pipe

(OD)

Nominal

Thickness

of Flanged

Nozzle

Pipe Wall [a]

 

\(t_n\)

Diameter

of Hole in

Reinforcing

Plate

 

 

\(D_R\)

Length of

Side of

Reinforcing

Plate [b] or

Diameter

 

\(L=D_o\)

Width of

Reinforcing

Plate

 

 

 

\(W\)

[c] Min. Dist.

from Shell

to Flange

Face

 

 

\(J\)

[c] Min. Dist.

from Bottom

of Tank to

Center of Nozzle

(Regular Type) [d]

 \(H_N\)

[c] Min. Dist.

from Bottom

of Tank to

Center of Nozzle

(Low Type)

\(C\)

48 1219.2 [e] 1222 2455 2970 400 1325 1230
46 1168.4 [e] 1172 2355 2845 40 1275 1180
44 1117.6 [e] 1121 2255 2725 375 1225 1125
42 1066.8 [e] 1070 2155 2605 375 1175 1075
40 1016.0 [e] 1019 2050 2485 375 1125 1025
38 965.2 [e] 968 1950 2355 350 1075 975
36 914.4 [e] 918 1850 2235 350 1025 925
34 863.6 [e] 867 1745 2115 325 975 875
32 812.8 [e] 816 1645 1995 325 925 820
30 762.0 [e] 765 1545 1865 300 875 770
28 711.2 [e] 714 1440 1745 300 825 720
26 660.4 [e] 664 1340 1625 300 750 670
24 609.6 12.7 613 1255 1525 300 700 630
22 558.8 12.7 562 1155 1405 275 650 580
20 508.0 12.7 511 1055 1285 275 600 525
18 457.2 12.7 460 950 1160 250 550 475
16 406.4 12.7 410 850 1035 250 500 425
14 355.6 12.7 359 750 915 250 450 375
12 323.8 12.7 327 685 840 225 425 345
10 273.0 12.7 276 585 720 225 375 290
8 219.1 12.7 222 485 590 200 325 240
6 168.3 10.97 171 400 495 200 275 200
4 114.3 8.56 117 305 385 175 225 150
3 88.9 7.62 92 265 345 175 200 135
2 [f] 60.3 5.54 63 - - 150 175 [h]
1 1/2 [f] 48.3 5.08 51 - - 150 150 [h]
1 [f] 33.4 6.35 - - - 150 150 [h]
3/4 [f] 26.7 5.54 - - - 150 150 [h]

threaded and socket welded couplings

Size of

Nozzle

(NPS)

Outside

Diameter

of Pipe

(OD)

Nominal

Thickness

of Flanged

Nozzle

Pipe Wall [a]

 

\(ft_n\)

Diameter

of Hole in

Reinforcing

Plate

 

 

\(D_R\)

Length of

Side of

Reinforcing

Plate [b] or

Diameter

 

\(L=D_o\)

Width of

Reinforcing

Plate

 

 

 

\(W\)

[c] Min. Dist.

from Shell

to Flange

Face

 

 

\(J\)

[c] Min. Dist.

from Bottom

of Tank to

Center of Nozzle

(Regular Type) [d]

\(H_N\)

[c] Min. Dist.

from Bottom

of Tank to

Center of Nozzle

(Low Type)

 \(C\)

3 [g] 108.0 Coupling 111.1 285 360 - 225 145
2 [f] 76.2 Coupling 79.4 - - - 175 [h]
1 1/2 [f] 63.5 Coupling 66.7 - - - 150 [h]
I [f] 44.5 Coupling 47.6 - - - 125 [h]
3/4 [f] 35.0 Coupling 38.1 - - - 100 [h]

 

  • [a] For extra-strong pipe, see ASTM A53 or ASTM A106 for other wall thicknesses; however, piping material must conform to API Std 650 4.5.
  • [b] The width of the shell plate shall be sufficient to contain the reinforcing plate and to provide clearance from the girth joint of the shell course.
  • [c] Unless otherwise specified by the Purchaser, the nozzle shall be located at the minimum distance but shall also meet the weld spacing requirements of API Std 650 5.7.3.
  • [d] The \(H_N\) dimensions given in this table are for Appendix A tank designs only; see API Std 650 5.7.3 to determine minimum \(H_N\) for basic tank designs.
  • [e] See Table API Std 650 5-7b, Column 2.
  • [f] Flanged nozzles and couplings in pipe sizes NPS 2 or smaller do not require reinforcing plates. \(D_R\) will be the diameter of the hole in the shell plate, and Weld A will be as specified in Table API Std 650 5-7b, Column 6. Reinforcing plates may be used if the construction details comply with reinĀ¬forced nozzle details.
  • [g] A coupling in an NPS 3 requires reinforcement.
  • [h] See API Std 650 5.7.3.