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| Long
Welding Neck Flanges |
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| Class
900 |
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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 |
Use Class 1500 Diameters in
these sizes |
| ¾ |
| 1 |
| 1 ¼ |
| 1 ½ |
| 2 |
| 2 ½ |
| 3 |
240 |
127.0 |
127 |
76.2 |
38.1 |
304.8 |
190.5 |
8 |
25.4 |
| 4 |
290 |
157.2 |
159 |
101.6 |
44.5 |
304.8 |
235.0 |
8 |
31.8 |
| 5 |
350 |
185.7 |
190 |
127.0 |
50.8 |
304.8 |
279.4 |
8 |
35.0 |
| 6 |
380 |
215.9 |
235 |
152.4 |
55.6 |
304.8 |
317.5 |
12 |
31.8 |
| 8 |
470 |
269.9 |
298 |
203.2 |
63.5 |
304.8 |
393.7 |
12 |
38.1 |
| 10 |
545 |
323.8 |
368 |
254.0 |
69.9 |
406.4 |
469.9 |
16 |
38.1 |
| 12 |
610 |
381.0 |
419 |
304.8 |
79.4 |
406.4 |
533.4 |
20 |
38.1 |
| 14 |
640 |
412.8 |
451 |
355.6 |
85.8 |
To be specified by purchaser |
558.8 |
20 |
41.3 |
| 16 |
705 |
469.9 |
508 |
406.4 |
88.9 |
616.0 |
20 |
44.5 |
| 18 |
785 |
533.4 |
565 |
457.2 |
101.6 |
685.8 |
20 |
50.8 |
| 20 |
855 |
584.2 |
622 |
508.0 |
108.0 |
749.3 |
20 |
54.0 |
| 24 |
1,040 |
692.2 |
749 |
609.6 |
139.7 |
901.7 |
20 |
66.7 |
| 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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