What are AWWA Flanges? - Wermac.org

An AWWA flange is a type of pipe flange designed for waterworks applications. They follow standards developed by the American Water Works Association and are specifically designed for low-pressure water applications.

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AWWA flanges fall under standards such as C207 and C228, which govern the design, manufacture and application of flanges in water 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

There are two AWWA standards for flanges

The American Water Works Association offers two official flange standards for water supply systems: AWWA C207 and AWWA C228. These standards define critical properties such as: bolt patterns and drilling specifications, flange thickness, pressure ratings and acceptable material grades.

The difference between AWWA C207 and C228 ...

AWWA C207 is a standard for steel ring flanges for water utilities and provides guidelines for the design, materials, sizing and testing of flanges used in water systems. The C207 standard includes several classes of flanges, each designed to handle different pressures. These flanges are usually made of carbon steel and are designed to meet the pressure requirements of water piping systems in industrial applications. They are often used in pipelines, water treatment plants and other infrastructure projects.

AWWA C228 is a newer standard that specifies stainless steel pipe flanges for water pipelines. It contains guidelines for the design, material, sizing and testing of stainless steel flanges used in potable and non-potable water systems. Stainless steel offers enhanced corrosion resistance, making C228 flanges suitable for environments where water quality and longevity are critical.

Specification AWWA C207 AWWA C228 Material Steel material conforms to the requirements of AWWA C207 specifications. Dual grade 304/304L  316/316L stainless steel material conforms to the requirements of AWWA C228 specifications. Dimensions The flange thickness and bolt circle diameters vary according to pipe size, following specific tables in the standard. Conforms to the same dimensional criteria as the C207 standard, ensuring compatibility with existing systems. Pressure Classes A, B, D, E, F Various classes are defined in the standard, similar to C207. Use Case Standard waterworks systems Corrosive environments, potable water Corrosion Resistance Requires protective coating High resistance, no coating needed Availability Common for large-diameter piping Ideal for treatment plants and coastal use Design Ring-type flange suitable for slip-on or weld-neck connection. These can be slip-on, weld-neck, or blind types, depending on application requirements.

Pressure Classes of AWWA Flanges

Flange Class Max Pressure (psi) Use Case Class A Up to 50 psi (3.5 bar) Low-pressure systems, limited-duty use Class B Up to 86 psi (6 bar) Light-duty water distribution lines Class D Up to 175 psi (12 bar) Standard municipal water systems Class E Up to 275 psi (19 bar) High-flow or elevated pressure zones Class F Up to 300 psi (21 bar) Extra-duty or critical water lines

Application areas for AWWA flanges

Due to their high availability and affordability, AWWA flanges are ideal for..

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• Water treatment plants
• Water distribution systems
• Sewer and wastewater systems
• Irrigation systems
• Pumping stations
• Stormwater systems
• Water distribution systems

AWWA vs. ASME Flanges

Feature AWWA Flange ANSI/ASME Flange Applications Waterworks, utility piping Industrial, chemical, high-temp/pressure Pressure Range Up to 300 psi Up to psi or more (per ASME B16.5 Class ) Standards AWWA C207, C228 ASME B16.5, B16.47 Size Range 4" to 144" 1/2" 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

Concluding Remarks

If a project involves municipal water distribution, irrigation or non-critical wastewater pipelines, AWWA flanges are a smart and reliable choice. Designed for low-pressure environments, they are backed by more than a century of AWWA technology. Therefore, they remain the ultimate solution for water pipeline infrastructure.

Reference(s) ..
www.awwa.org
https://apiint.com

Related Post(s)

AWWA C207: Applicable to steel pipe flanges, covering sizes from 4 inches to 144 inches, and is suitable for water treatment plants, wastewater treatment plants, and similar applications.

StandardAWWA C207TypeSteel Ring FlangesBlind FlangesSteel Hub FlangesSize Range4”-144”4”-144”4”-144”4”-48”4”-72”4”-72”4”-72”4”-72”4”-96”4”-96”Pressure RatingClass BClass DClass EClass FClass BClass DClass EClass FClass DClass EWorking Pressure86 psi175-150 psi275 psi300 psi86 psi175-150 psi275 psi300 psi175-150 psi275 psi

AWWA C228: Applicable to stainless steel pipe flanges, with sizes ranging from 2 inches to 72 inches, primarily used in environments requiring corrosion resistance.

StandardAWWA C228TypeSteel Ring FlangesBlind FlangesSize Range2”-72”2”-72”2”-72”4”-48”4”-48”2”-72”2”-72”2”-72”2”-72”2”-72”Pressure RatingClass SAClass SBClass SDClass SEClass SFClass SAClass SBClass SDClass SEClass SFWorking Pressure50 psi86 psi175-150 psi275 psi300 psi50 psi86 psi175-150 psi275 psi300 psi

AWWA C207: Provides multiple pressure ratings (e.g., Class B, D, E, F) to accommodate different working pressures.

AWWA C228: Pressure ratings are similar to C207, but due to the material differences, it is more suitable for corrosive environments.

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