- AWWA C110/A21.10 - Ductile-Iron and Gray-Iron Fittings (3" to 48")
- ASME B16.1 - Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250 (Flange surfaces shall be faced and drilled in accordance with ANSI Class 125)
- The flanges of AWWA C110/A21.10 and AWWA C153/A21.53 standards conform to the drilling and facing of ASME B16.1 Class 125 flanges. This ASME B16.1 Class 125 designation leads some to conclude that these AWWA flanges are only rated at 125 psi service which is not correct.
- AWWA C110/A21.10 flanged fittings are rated for 350 psi operating pressure for 3" through 12" sizes, 250 psi operating pressure for 14" through 48" sizes and AWWA C153/A21.53 fittings are rated for 150 psi operating pressure for 54" through 64" sizes.
- Flanges of ductile iron fittings meeting the requirements of AWWA C110/A21.10 cannot be joined with ASME B16.1 class 250 flanges.
- All ductile iron flanged fittings shall be rated for water pressure of 250 PSI.
| Pipe Size | Outside Diameter of Flange A | Thickness of Flange C | Number of Bolt Holes | Diameter of Bolt Holes | Bolt Circle Diameter P |
|---|
| 2 |
6 |
5/8 ± .12 |
4 |
3/4 |
4 3/4 |
| 3 |
7 1/2 |
3/4 ± .12 |
4 |
3/4 |
6 |
| 4 |
9 |
15/16 ± .12 |
8 |
3/4 |
7 1/2 |
| 6 |
11 |
1 ± .12 |
8 |
7/8 |
9 1/2 |
| 8 |
13 1/2 |
1 1/8 ± .12 |
8 |
7/8 |
11 3/4 |
| 10 |
16 |
1 3/16 ± .12 |
12 |
1 |
14 1/4 |
| 12 |
19 |
1 1/4 ± .12 |
12 |
1 |
17 |
| 14 |
21 |
1 3/8 ± .12 |
12 |
1 1/8 |
18 3/4 |
| 16 |
23 1/2 |
1 7/16 ± .19 |
16 |
1 1/8 |
21 1/4 |
| 18 |
25 |
1 9/16 ± .19 |
16 |
1 1/4 |
22 3/4 |
| 20 |
27 1/2 |
1 11/16 ± .19 |
20 |
1 1/4 |
25 |
| 24 |
32 |
1 7/8 ± .19 |
20 |
1 3/8 |
29 1/2 |
| 30 |
38 3/4 |
2 1/8 ± .25 |
28 |
1 3/8 |
36 |
| 36 |
46 |
2 3/8 ± .25 |
32 |
1 5/8 |
42 3/4 |
| 42 |
53 |
2 5/8 ± .25 |
36 |
1 5/8 |
49 1/2 |
| 48 |
59 1/2 |
2 3/4 ± .25 |
44 |
1 5/8 |
56 |
| 54 |
66 1/4 |
3 ± .25 |
44 |
2 |
62 3/4 |
| 60 |
73 |
3 1/8 ± .25 |
52 |
2 |
69 1/4 |
| 64 |
80 |
3 3/8 ± .25 |
52 |
2 |
76 |
| Bolt Size |
|---|
| Pipe Size | Number of Bolts | Bolt Diam. and Length |
|---|
| 2 |
4 |
5/8 x 2 1/4 |
| 3 |
4 |
5/8 x 2 1/2 |
| 4 |
8 |
5/8 x 3 |
| 6 |
8 |
3/4 x 3 1/2 |
| 8 |
8 |
3/4 x 3 1/2 |
| 10 |
12 |
7/8 x 4 |
| 12 |
12 |
7/8 x 4 |
| 14 |
12 |
1 x 4 1/4 |
| 16 |
16 |
1 x 4 1/4 |
| 18 |
16 |
1 1/8 x 5 |
| 20 |
20 |
1 1/8 x 5 |
| 24 |
20 |
1 1/4 x 5 1/2 |
| 30 |
28 |
1 1/4 x 6 1/2 |
| 36 |
32 |
1 1/2 x 7 |
| 42 |
36 |
1 1/2 x 7 1/2 |
| 48 |
44 |
1 1/2 x 8 |
Ductile Iron Flange Bolt Rotation
