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| Long
Welding Neck Flanges |
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| Class
400 |
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Unit: mm |
| Nominal Pipe
Size |
Outside Diameter |
O.D. of Raised face |
Hub Diameter of Bevel |
Diameter of Bore |
Thickness if Flange Min. |
Length through Hub |
Drilling |
| Diameter
or bolt circle |
Number of holes |
Diameter of holes |
| D |
G |
E |
B |
t |
L |
C |
|
d |
| ½ |
|
| ¾ |
|
| 1 |
|
| 1 ¼ |
|
| 1 ½ |
Use Class 600 Diameters in these sizes |
| 2 |
|
| 2 ½ |
|
| 3 |
|
| 3 ½ |
|
| 4 |
255 |
157.2 |
146 |
101.6 |
35.0 |
304.8 |
200.0 |
8 |
25.4 |
| 5 |
280 |
185.7 |
178 |
127.0 |
38.1 |
304.8 |
235.0 |
8 |
25.4 |
| 6 |
320 |
215.9 |
206 |
152.4 |
41.3 |
304.8 |
269.9 |
8 |
25.4 |
| 8 |
380 |
269.9 |
260 |
203.2 |
47.7 |
304.8 |
330.0 |
8 |
28.6 |
| 10 |
445 |
323.8 |
321 |
254.0 |
54.0 |
304.8 |
387.4 |
12 |
31.8 |
| 12 |
520 |
381.0 |
375 |
304.8 |
57.2 |
304.8 |
450.8 |
12 |
35.0 |
| 14 |
585 |
412.8 |
425 |
355.6 |
60.4 |
304.8 |
514.4 |
12 |
35.0 |
| 16 |
650 |
469.9 |
483 |
406.4 |
63.5 |
304.8 |
571.5 |
16 |
38.1 |
| 18 |
710 |
533.4 |
533 |
457.2 |
66.7 |
304.8 |
628.6 |
16 |
38.1 |
| 20 |
775 |
584.2 |
587 |
508.0 |
69.9 |
304.8 |
685.8 |
20 |
41.3 |
| 24 |
915 |
692.2 |
702 |
609.6 |
76.2 |
304.8 |
812.8 |
20 |
47.6 |
| Notes: |
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| (1)
Bore (B) is the same as nominal pipe size. |
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| (2)
Welding Necks longer than listed are available in all sizes on special order. |
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