As a waterworks engineer, you know that the reliability of your systems is essential. AWWA flanges play a critical role in maintaining the reliability of your systems by providing a secure and leak-free connection between pipes and other components. It is important to choose flanges that meet the standards of the American Water Works Association (AWWA). The AWWA C207 standard specifies the requirements for AWWA flanges, including material, dimensions, pressure ratings, facing, and bolting.
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Understanding AWWA C207 Steel Flanges
AWWA C207 steel flanges are pipe flanges that are specifically designed for use in waterworks applications. These flanges are often made from mild carbon steel or stainless steel and are commonly of the ring slip-on or blind disc style. AWWA C207 flanges are typically used in low-pressure applications, such as water distribution and transmission systems, wastewater treatment plants, and industrial piping systems. They are also commonly used in fire protection systems.
Types of AWWA C207 Steel Flanges
- Slip-on ring and hub-type flanges: The most common type. Easy to install, suitable for a wide range of applications.
- Blind flanges: Used to close off the end of a pipe or fitting. Also commonly used to isolate sections of a piping system.
- Threaded iron flanges: Used to connect pipes and fittings with threaded ends. Typically for low-pressure applications.
Specific Requirements For AWWA Flanges
Material
AWWA flanges must be made of steel that meets the following minimum requirements:
- Sulfur: 0.05% maximum
- Phosphorus: 0.04% maximum
- Carbon: 0.29% maximum
- Tensile strength: 50,000 psi minimum
- Yield strength: 32,000 psi minimum
Dimensions
Common dimensions of AWWA C207 slip-on ring and hub-type flanges:
| Size | OD (in) | BCD (in) | Thickness (in) | Bolt Hole Dia (in) | Bolts |
|---|---|---|---|---|---|
| 4 | 5.50 | 4.63 | 0.75 | 0.62 | 8 |
| 6 | 6.88 | 6.00 | 0.88 | 0.75 | 12 |
| 8 | 8.25 | 7.38 | 1.00 | 0.88 | 16 |
| 10 | 10.00 | 9.13 | 1.13 | 1.00 | 20 |
| 12 | 12.00 | 10.88 | 1.25 | 1.13 | 24 |
Pressure Ratings
AWWA C207 steel flanges are available in a variety of pressure ratings, from Class 2B (150 psi) to Class 6F (300 psi). The pressure rating of a flange indicates the maximum pressure that it can withstand safely.
Facing
Flat-faced flanges: The most common type. Flat surface with no projection. Typically used in low-pressure applications.
Raised-faced flanges: Have a raised rim for a tight seal. Typically used in higher-pressure applications where a leak-tight seal is essential.
Bolting
- Bolt Size: Depends on the size and pressure rating of the flange per AWWA C207.
- Bolt Tightening: Must be tightened to a specific torque per AWWA C207.
- Bolt Pattern: The arrangement of bolt holes is specified in AWWA C207.
Applications of AWWA C207 Flanges
Advantages of AWWA C207
- Reliability: Manufactured to strict standards.
- Durability: Resistant to corrosion and environmental factors.
- Versatility: Available in various sizes, pressure ratings, and facings.
- Compatibility: Compatible with other waterworks components.
- Ease of installation: Relatively easy to install.
Conclusion
AWWA C207 steel flanges are specifically designed for waterworks applications. They offer reliability, durability, versatility, compatibility, and ease of installation. Additionally, AWWA C207 flanges offer superior sealing performance, resistance to corrosion and wear, and a wide range of operating temperatures. Overall, AWWA C207 steel flanges are a good choice for waterworks applications.
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