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AWWA C207 Steel Pipe Flanges for Waterworks

The AWWA C207 standard provides comprehensive guidelines for the design, manufacture, and application of steel pipe flanges specifically intended for waterworks service. This standard is crucial for ensuring the reliability, safety, and performance of flanged connections in water distribution systems. Here's a more detailed description:

1. Flange Types: AWWA C207 covers a variety of flange types commonly used in waterworks service, including slip-on, blind, threaded, and lap-joint flanges. It also includes specifications for companion flanges and flanged fittings, providing flexibility for different installation requirements and configurations.
2. Materials: The standard specifies the materials for flanges, ensuring they meet specific requirements for strength, corrosion resistance, and compatibility with potable water. Common materials include carbon steel, stainless steel, and ductile iron, with provisions for coatings or linings to enhance durability and longevity.
3. Dimensions: AWWA C207 defines the dimensions and tolerances for flanges, including nominal pipe sizes, outside diameters, bolt hole patterns, facing dimensions, and thicknesses. These specifications ensure proper fit and alignment of flanges with pipes and fittings, facilitating leak-free connections.
4. Facing: The standard outlines requirements for flange facing, including options such as raised face, flat face, and ring-type joint facing. Proper facing ensures uniform contact and sealing between flange surfaces, minimizing the risk of leaks and ensuring system integrity.
5. Bolting: AWWA C207 specifies bolt sizes, types, and patterns for flange connections, ensuring adequate strength and reliability under operating conditions. It also provides guidelines for bolt tightening procedures to achieve proper sealing and prevent flange distortion.
6. Marking and Identification: The standard includes provisions for marking flanges with essential information, such as material grade, manufacturer's name or trademark, nominal size, and pressure rating. This facilitates traceability and ensures compliance with specified requirements.
7. Testing and Quality Assurance: AWWA C207 may include provisions for testing and quality assurance to verify compliance with the standard's requirements. This may include dimensional inspections, material testing, and hydrostatic or pneumatic pressure testing of flanged connections.

Overall, adherence to AWWA C207 ensures the proper selection, manufacturing, and installation of steel pipe flanges in waterworks service, contributing to the overall reliability, safety, and efficiency of water distribution systems.