AWWA C207 Class D
These AWWA Class D Steel Ring Flanges meet AWWA C207 specifications and comply with ANSI #150 bolt pattern requirements. At atmospheric temperature, this slip-on style flange is pressure rated to 175psi for 4- to 12-inch flanges, and 150psi for flanges 14 inches and larger.
General Introduction
The AWWA C207 flanges are intended for attachment to steel pipes, fittings, valves or other appurtenances in water utility service. The standard has specified two general types of flange: (1) ring-type slip-on flanges, also known as ring flanges or plate flanges; (2) blind flanges. Both the ring flange and blind flange are steel flanges without hub. Besides, in Appendix B, it also provides additional information for dimensions of steel-hub flanges. The AWWA C207 flange can be further classified 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 customary in water utility service.
AWWA C207 Materials
In terms of materials, the AWWA C207 Class D standard typically specifies the use of materials with specific mechanical and chemical properties, such as carbon steel, stainless steel, or other alloy materials. The selection of these materials is to ensure the strength and corrosion resistance of the flange, in order to meet the performance requirements under specific working conditions. In addition, standards may also specify key parameters such as chemical composition, tensile strength, yield strength, and elongation of materials to ensure their quality.
AWWA C207 Manufacture
In terms of manufacturing, the AWWA C207 Class D standard specifies detailed manufacturing processes and quality control requirements. This includes various processes such as flange forming, welding, heat treatment, and mechanical processing. During the manufacturing process, it is necessary to strictly control key elements such as dimensional accuracy, surface quality, and welding quality to ensure the performance and reliability of the flange. In addition, standards may also require recording of the manufacturing process and retention of relevant quality certification documents for traceability and review.
Dimensional Tolerances
Inside diameter of flange: +1/16″ [1.6 mm], -0; Outside diameter of flange: ±1/8″ [3.2 mm]; Thickness of flange 18″ [450 mm] and smaller: +1/8″ [3.2 mm], -0; Thickness of flange 20″ [500 mm] and larger: +3/16″ [4.8 mm], -0; Bolt circle diameter: ±1/16″ [1.6 mm]; Bolt hole spacing: ±1/32 [0.79 mm].
Marking & Coating
Flanges shall be stenciled with the size, material and trademark, as well as with the AWWA class and heat number. For example: M 48″ AWWA C207 Class D ASTM A516 Gr.60 6558. Protective coating shall be furnished conforming to either AWWA C203, C209, C210, C213, C216, C217, C218, or C222. Generally, the flange-coating alternatives include yellow golden, black, anti-rust oil, PE, and coal tar, etc.
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