Understanding APIICP653 Reading 2-650-Selected Reading

Column 1 Column 2 Column 3 Column 4 Column 5 Column 6
Thickness of Shell
and Reinforcing
Plate a
t and T
a
b
Table 5.7a—Dimensions for Shell Nozzles: Pipe, Plate, and Welding Schedules (SI) (Continued)
Minimum Pipe
Wall Thickness of
Flanged Nozzles b
t n
Maximum
Diameter of Hole
in Shell Plate
(D p ) Equals
Outside Diameter
of Pipe Plus
b) The portion lying within the shell-plate thickness.
Size of Fillet
Weld B
Nozzles Larger
Than NPS 2
Size of Fillet Weld A
NPS 3 / 4 to 2
Nozzles
16 12.7 20 16 8 8
17 12.7 20 18 8 8
20 12.7 20 20 8 8
21 12.7 20 21 10 8
22 12.7 20 22 10 8
24 12.7 20 24 10 8
25 12.7 20 25 11 8
27 14 20 27 11 8
28 14 20 28 11 8
30 16 20 30 13 8
32 16 20 32 13 8
33 18 20 33 13 8
35 18 20 35 14 8
36 20 20 36 14 8
38 20 20 38 14 8
40 21 20 40 14 8
41 21 20 40 16 8
43 22 20 40 16 8
45 22 20 40 16 8
If a shell plate thicker than required is used for the product and hydrostatic loading (see 5.6), the excess shell-plate thickness, within a vertical
distance both above and below the centerline of the hole in the tank shell plate equal to the vertical dimension of the hole in the tank shell
plate, may be considered as reinforcement, and the thickness T of the nozzle reinforcing plate may be decreased accordingly. In such cases,
the reinforcement and the attachment welding shall conform to the design limits for reinforcement of shell openings specified in 5.7.2.
This column applies to flanged nozzles NPS 26 and larger. See 4.5 for piping materials.
NOTE See Figure 5.8.
Dimensions in millimeters
c) The portion extending inward from the inside surface of the tank shell plate to the distance specified in Item a.