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FRP Backing Flanges
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FRP backing flanges are to be used with FRP
stub end flanges.
Type A FRP flanges are available in sizes through
12in. Type B FRP flanges are available in sizes 14 in. through 48 in.
Machined A-36 steel plate flanges with a constant
thickness, T, are also available.
Specialty coatings are available upon request.
Cast stainless steel flanges are available on
special order.
Drilled hole patterns per ANSI B16.1, Class
125 (identical to ANSI B16.5, Class 150 through 24in.).
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Dia |
I.D. |
O.D. |
B.C. |
T |
t |
No.
Holes |
Hole
Size |
Max
Press |
Approx
Wt. |
|
1 1/2 |
2 1/4 |
5 |
3
7/8 |
1/2 |
3/8 |
4 |
5/8 |
150 |
3 |
|
2 |
2
7/8 |
6 |
4 3/4 |
5/8 |
3/8 |
4 |
3/4 |
150 |
4 |
|
2 1/2
|
3
3/8 |
7 |
5 1/2 |
5/8 |
3/8 |
4 |
3/4 |
150 |
5 |
|
3 |
4 |
7 1/2 |
6 |
5/8 |
3/8 |
4 |
3/4 |
150 |
6 |
|
4 |
5 |
9 |
7 1/2 |
5/8 |
3/8 |
8 |
3/4 |
150 |
7 |
|
6 |
7
1/8 |
11 |
9 1/2 |
3/4 |
3/8 |
8 |
7/8 |
150 |
10 |
|
8 |
9
1/8 |
13 1/2 |
11
3/4 |
3/4 |
3/8 |
8 |
7/8 |
150 |
15 |
|
10 |
11 1/2 |
16 |
14 1/4 |
7/8 |
1/2 |
12 |
1 |
150 |
20 |
|
12 |
13
5/8 |
19 |
17 |
7/8 |
12 |
12 |
1 |
150 |
29 |
|
14 |
15
7/8 |
21 |
18
3/4 |
1
3/8 |
- |
12 |
1
1/8 |
150 |
32 |
|
16 |
18
1/8 |
23 1/2 |
21 1/4 |
1
7/16 |
- |
16 |
1
1/8 |
150 |
43 |
|
18 |
20
1/8 |
25 |
22
3/4 |
1
9/16 |
- |
16 |
1 1/4 |
150 |
41 |
|
20 |
22
15/16 |
27 1/2 |
25 |
1
11/16 |
- |
20 |
1 1/4 |
150 |
47 |
|
24 |
26
11/16 |
32 |
29 1/2 |
1 7/8 |
- |
20 |
1
3/8 |
150 |
63 |
|
26 |
28 1/2 |
34 1/4 |
31
3/4 |
2 |
- |
24 |
1
3/8 |
125 |
83 |
|
28 |
30
5/8 |
36 1/2 |
34 |
2
1/16 |
- |
28 |
1
3/8 |
125 |
102 |
|
30 |
32
3/4 |
38
3/4 |
36 |
2
1/8 |
- |
28 |
1
3/8 |
125 |
111 |
|
36 |
39
5/16 |
46 |
42
3/4 |
2
3/8 |
- |
32 |
1
5/8 |
125 |
156 |
|
42 |
45
13/16 |
53 |
49 1/2 |
2
5/8 |
- |
36 |
1
5/8 |
125 |
208 |
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48 |
52
3/8 |
59 1/2
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56 |
2
3/4 |
- |
44 |
1
5/8 |
125 |
263 |
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