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Steel Flanges in The Waterworks Industry

Steel flanges are essential in industrial settings, particularly within the Water & Wastewater industry. These versatile units play a vital role in connecting pipes and valves, ensuring seamless fluid flow, and preventing leaks. 


At API International, we recognize the significance of quality steel flanges, offering a comprehensive range that includes AWWA C207 & C228, 1/2″-inch & 5/8″-inch Thick Light Weight, DIN (Metric), Exhaust, Backing, Plate, and ANSI-Style Forged Flanges. Let’s explore the diverse applications, technical insights, and benefits of these flanges in the Water & Wastewater industry.

304 carbon flange

Applications of Steel Flanges in the Waterworks Industry:

  1. AWWA C207 & C228 Flanges: Specifically designed for water and wastewater applications, these American Water Works Association (AWWA) standard flanges ensure dependable connections in high-pressure environments. They find use in water treatment plants, pumping stations, and distribution systems.
  2. 1/2″-inch & 5/8″-inch Thick Light Weight Flanges: These lightweight options are perfect when weight is a concern without compromising strength and durability. They are ideal for projects prioritizing efficiency and ease of handling.
  3. DIN (Metric) Flanges: Globally recognized for precision, DIN Flanges fit metric-sized pipes, ensuring compatibility for international collaboration in the Water & Wastewater sector.
  4. Exhaust Flanges: Beyond automotive use, exhaust flanges manage gas emissions in wastewater treatment plants, addressing the control of harmful gases.
  5. Backing Flanges: Essential for connecting pipes to flat surfaces, these flanges secure leak-free connections between pipes and adjacent structures, vital for constructing reservoirs and pump stations.
  6. Plate Flanges: Providing larger contact areas for stability in high-pressure applications, plate flanges minimize leaks and optimize fluid flow in water distribution systems and wastewater treatment plants.
  7. ANSI-Style Forged Flanges: Known for strength and durability, these flanges are dependable across water mains, sewage lines, and industrial water systems.

Technical Insights:

  1. Material Selection: Stainless steel is popular due to its corrosion resistance and longevity, making it suitable for water and wastewater environments. Pressure Ratings: AWWA C207 & C228 Flanges come in various pressure classes to match specific requirements.
  2. Gasket Compatibility: The suitable gasket material prevents leaks, aligning with fluid and operating conditions.
  3. Bolt and Nut Specifications: Properly sized and torque-controlled bolts and nuts maintain flange connection integrity.


In the Water & Wastewater industry, steel flanges serve as the backbone of fluid transportation and containment systems. API International offers diverse flange options, ensuring precise matches for specific project needs. From AWWA C207 & C228 to ANSI-Style Forged Flanges, each type holds unique advantages for distinct industry applications. By understanding the technicalities and selecting the appropriate flange type, reliable and efficient water and wastewater infrastructure can be established.

For all your steel flange requirements, navigate our diverse range of products at API International. Find tailored solutions compatible with your water system demands. Contact us today and get connected with a dedicated account manager!

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