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AWWA C207 Class D Flange
What is AWWA C207？
AWWA C207 is an American National Standard for steel pipe flanges for waterworks service, sizes 4″ to 144″ (100 mm to 3600 mm). AWWA is the acronym for the American Water Works Association. The origin of AWWA C207 can be traced back to 1942, when a paper proposed standards for slip-on steel ring flanges for welding to steel water mains. This standard was necessary because the lowest pressure ratings for steel flanges at that time were those with cold water pressure ratings of 275 psi (1896 KPa). These ratings are much higher than those normally required for water service (150 psi / 1034 kPa).
AWWA C207 flanges are intended for attachment to steel pipe, fittings, valves or other appurtenances used in water service. The standard specifies two general types of flanges: (1) slip-on ring flanges, also known as ring flanges or plate flanges; (2) blind flanges. Both ring flanges and blind flanges are steel flanges without a hub. Additional information on the dimensions of steel hub flanges is also provided in Appendix B. The AWWA C207 flange can be further divided into four classes according to its working pressure limit: Class B (86 psi), Class D (175-150 psi), Class E (275 psi), Class F (300 psi). The pressure limits are for conditions and temperatures common in water utility service.
Classes Of Flange AWWA C207
| Hub Flange | Blind Flange | Ring Flange |
|---|---|---|
| Class D | Class E | Class B | Class D Class E | Class F | Class B | Class D Class E | Class F |
AWWA Flanges Dimensions Covered Classes
| Fange type | Hub | Blind | Ring |
|---|---|---|---|
| class | D, E | B | D E | F | B | D E | F |
AWWA C207 Flange Class
| Flange class | Pressure |
|---|---|
| 6F | 300 psi |
| 5E | 275 psi |
| 4E | 275 psi |
| 3D | 175-150 psi |
| 2D | 175-150 psi |
| 2B | 86 psi |
Chemical & Mechanical Properties Of Flange AWWA C207
| Yield | 32,000 PSI (min.) |
|---|---|
| Tensile | 50,000 PSI (min.) |
| Carbon | 0..29% (max.) |
| Phosphorus | 0.04% (max.) |
| Sulfur | 0.05% (max.) |
Materials Used For Making AWWA C207 Flanges
- Nickel alloy
- MS (Mild steel)
- SS (Stainless Steel)
- Steel alloy
- Hastelloy
Dimensional Tolerance Value Of AWWA Flange
| Flange part | Tolerance value |
|---|---|
| Bolt hole spacing | +1/32 |
| Diameter of bolt circle | +1/16″ |
| Flange thickness <18 | +1/8″ |
| Flange thickness >20 | +3/16″ |
| OD (Outer diameter) | +1/8″ |
| ID (Internal diameter) | +1/6″ |
Available Sizes Of AWWA C207 Class D Flange
- Blind flange
- AWWA C207 Class D slip on flange
- Ring flange
- Hub flange
Gasket Dimensions Of AWWA C207 Class D Flange
| AWWA C207 Class | NSP in inch | NSP in MM | Face Type | Working Pressure | Working Pressure | Gaskets Material | Thickness in Inch | Thickness in MM |
|---|---|---|---|---|---|---|---|---|
| D | 26–144 | 650–3,600 | Ring | 150 PSI | 1,034 kPa | Rubber | 1/8 | 3.18 |
| D | 4–12 | 100–300 | FF | 175 PSI | 1,207 kPa | Rubber | 1/16 or 1/8 | 1.59 or 3.18 |
| D | 14–24 | 350–600 | FF | 150 PSI | 1,034 kPa | Rubber | 1/16 or 1/8 | 1.59 or 3.18 |
AWWA C207 Class D Flange Weight Chart
| Size | Weight Of blind flange In lbs | Weight Of slip on flange In lbs |
|---|---|---|
| 4 | 24.25 | 17.63 |
| 5 | 30.86 | 19.84 |
| 6 | 41.88 | 24.25 |
| 8 | 72.75 | 33.06 |
| 10 | 119.04 | 41.88 |
| 12 | 198.41 | 72.75 |
| 14 | 244.71 | 103.61 |
| 16 | 341.71 | 132.27 |
| 18 | 407.85 | 141.09 |
| 20 | 537.92 | 174.16 |
| 22 | 670.20 | 198.41 |
| 24 | 833.34 | 246.91 |
| 28 | 1245.61 | 310.85 |
| 30 | 1479.30 | 361.55 |
| 32 | 1838.65 | 465.17 |
| 34 | 2114.23 | 485.01 |
| 38 | 2921.12 | 663.59 |
| 40 | 3170.24 | 690.04 |
| 42 | 3761.08 | 802.48 |
| 44 | 4265.94 | 853.18 |
| 48 | 5335.18 | 1014.12 |
| 50 | 5978.93 | 1117.74 |
| 52 | 6660.16 | 1194.90 |
| 54 | 7396.50 | 1353.63 |
| 60 | 9878.91 | 1682.12 |
| 72 | 16442.07 | 2652.16 |
Marking & Coating
Flanges shall be stenciled with size, material and brand as well as AWWA class and heat number. For example: M 48″ AWWA C207 Class D ASTM A516 Gr.60 6558. Protective coating shall be provided in accordance with either AWWA C203, C209, C210, C213, C216, C217, C218 or C222. Flange coatings generally include yellow gold, black, anti-rust oil, PE, coal tar, etc.
C&N Hongcheng Flange Factory has more than 20 years experience in AWWA C207 standard flange products. Our design and manufacturing team will try the best to meet your requirement in these steel flanges.
