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A Comprehensive Overview of Waterworks Flanges


Pipe flanges provide a secure and leak-proof connection between pipes in waterworks infrastructure. They allow for easy assembly and disassembly of pipes, facilitating maintenance and repairs. Furthermore, they enable the connection of different pipe materials and sizes. This guarantees compatibility within the water distribution system, which contributes to the overall efficiency of the water supply network.

At Coastal Flange, we specialize in manufacturing and distributing pipe flanges. Our facilities are located in Jersey Village, Texas, in the heart of the oil, gas, and petrochemical sector. We also prioritize quality control and customer satisfaction, ensuring that each flange meets industry standards and specifications.

The AWWA Standards

The American Water Works Association (AWWA) have established standards for the manufacturing of water pipe flanges. AWWA standards focus on water-related infrastructure — including pipe flanges — to address material composition, dimensions, and performance requirements.

AWWA standards uphold the quality and integrity of flanges, contributing to the efficiency of water supplies. They also ensure interoperability and safety across different manufacturers and regions, which promotes design and performance consistency.

Here are two relevant specifications for steel and stainless steel water pipe flanges:


AWWA C207 specifically addresses steel water pipe flanges for waterworks service. It provides detailed specifications for the design, materials, dimensions, and testing requirements of flanges in water distribution systems. It also covers various types — including slip-on, blind, threaded, and weld-neck flanges — offering flexibility to suit different application needs.


AWWA C228 defines the standards for stainless steel pipe flanges used in water service applications, with diameters ranging from 4 to 72 inches. It also shows the specific materials, dimensions, and testing methods required. These specifications ensure the proper functioning and longevity of stainless-steel pipe flange joints in water distribution systems.

Types of Flanges in the Waterworks Industry

Here are the different types of water pipe flanges:

Slip-On Flanges

Slip-on flanges slide over the pipe and are then welded in place at the inside and outside of the flange. This type is often used in water treatment plants, HVAC systems, and low-pressure piping systems. They are also employed in low-pressure applications.

Blind Flanges

Unlike other types, blind flanges lack a bore in the center, effectively sealing off the pipe or vessel. They are commonly used for isolation or termination, such as capping off pipes during maintenance or shutting down pipeline sections.

Partner With Coastal Flange Today!

At Coastal Flange, we offer a comprehensive range of flange solutions tailored to your specific project requirements. Our extensive waterwork industry inventory includes slip-on and blind flanges, available in various sizes and materials to suit diverse applications. Backed by decades of industry expertise, our team is dedicated to delivering unmatched quality, reliability, and customer satisfaction!

Contact us today or request a quote.

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