What Are AWWA Flanges?
An AWWA flange is a type of pipe flange designed for waterworks service. It follows standards developed by the American Water Works Association and is specifically intended for low-pressure water applications. AWWA flanges are governed by standards such as C207 and C228, which guide the design, manufacturing, and application of flanges used in water systems.
AWWA Flanges Main Application:
Due to their large size, availability and affordability, AWWA flanges are ideal for:
- Water Treatment Plants
- Water Distribution Systems
- Sewage and Wastewater Systems
- Irrigation Systems
- Pump Stations
- Stormwater Systems
- Water Distribution Systems
- Stormwater Systems
Key features of AWWA flanges
| Feature | Details |
| Standards | AWWA C207 (carbon steel), AWWA C228 (stainless steel) |
| Pressure Ratings | From Class A (up to 50 psi) to Class F (up to 300 psi) |
| Sizes | Typically available from 2″-144″ |
| Materials | Carbon steel, ductile iron, stainless steel |
| Types | Slip-on-ring (2″-144″), blind (4″72″), hub ring (4″-96″) |
| Applications | Waterworks piping systems, irrigation, fire protection |
AWWA Flange vs. ANSI/ASME Flanges
While AWWA flanges (C207 and C228) are specifically designed for waterworks applications, ANSI flanges cater to a broader range of industries, including oil and gas, chemical, and power generation.
Here are some key differences:
| Feature | AWWA Flange | ANSI/ASME Flange |
|---|---|---|
| Applications | Waterworks, utility piping | Industrial, chemical, high-temp/pressure |
| Pressure Range | Up to 300 psi | Up to 6170 psi or more (per ASME B16.5 Class 2500) |
| Standards | AWWA C207, C228 | ASME B16.5, B16.47 |
| Size Range | 4″ to 144″ | ½” to 24″ (larger via B16.47 Series B) |
| Material | Carbon steel and stainless steel | Stainless steel, alloy, exotic metals |
| Cost | Lower—ideal for large systems | Higher—engineered for specific tolerances |
If your project involves municipal water distribution, irrigation or non-critical wastewater pipelines, AWWA flanges are a smart and reliable choice. Designed for low-pressure environments, their design ensures easy installation, durability, and compatibility with various piping systems—making them a preferred option for waterworks engineers and contractors.
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