AWWA Flanges Descriptions

AWWA Flanges are designed specifically for waterworks and large-diameter pipeline applications.

Compared with many general-purpose piping flange standards, AWWA flange systems focus heavily on water transmission, wastewater treatment, pumping systems, and large-diameter steel pipe connections.

AWWA C207 provides dimensional requirements for steel ring-type slip-on flanges and blind flanges used in waterworks service.

These flanges provide standardized bolt-hole arrangements, outside diameters, thicknesses, and connection dimensions, helping simplify installation and maintenance in large pipeline systems.

AWWA Flanges Specification

Ring-Type Slip-On Flanges

Our AWWA Ring-Type Slip-On Flanges are designed to slide over large-diameter steel pipes before welding.

Their simple ring structure provides convenient alignment, economical fabrication, and reliable connection performance for waterworks pipelines.

AWWA Ring-Type Slip-On Flanges are particularly suitable for municipal water transmission, wastewater treatment, pumping stations, irrigation systems, cooling-water pipelines, and other large-diameter applications.

They can be manufactured in different flange classes and sizes according to project requirements.

Ring-Type Slip-On Flanges

Blind Flanges

AWWA Blind Flanges are solid circular flanges without a center bore and are used to close the end of pipelines, valves, equipment nozzles, and water-system branches.

Their removable bolted construction makes inspection, maintenance, cleaning, pressure testing, and future pipeline extension easier.

AWWA Blind Flanges are widely used in municipal water systems, wastewater plants, pumping stations, industrial water networks, and large pipeline projects.

They can be manufactured according to AWWA C207 dimensional requirements and customer specifications.

Blind Flanges

AWWA Class B Flanges

AWWA Class B Flanges are commonly used for lower-pressure waterworks piping applications.

Their economical design makes them suitable for large-diameter water transmission systems where moderate pressure and cost efficiency are important.

Typical applications include municipal water supply, irrigation systems, industrial water distribution, and general waterworks pipelines.

Class B Flanges

AWWA Class D Flanges

AWWA Class D Flanges are widely used in municipal and industrial water systems.

They provide a practical balance between flange strength, thickness, weight, and cost.

Class D Flanges are commonly used in water treatment plants, pumping stations, large-diameter water pipelines, wastewater treatment facilities, and industrial cooling-water systems.

Class D Flanges

AWWA Class E Flanges

AWWA Class E Flanges provide greater structural strength for applications requiring higher pressure capability.

They are suitable for demanding waterworks service, pumping facilities, industrial water systems, and large pipeline installations.

Their increased flange thickness and stronger construction make them suitable for more demanding operating conditions.

Class E Flanges

AWWA Class F Flanges

AWWA Class F Flanges are designed for higher-pressure waterworks and large-diameter piping systems.

They provide heavier construction and increased mechanical strength for demanding applications.

Class F Flanges are commonly used in high-pressure pumping stations, industrial water transmission systems, large municipal pipelines, and heavy-duty water infrastructure projects.

Class F Flanges

Advantages of AWWA Flanges

Large Diameter Capability

AWWA Flanges are particularly suitable for large-diameter pipeline systems.

Their wide size range makes them ideal for municipal water transmission, wastewater treatment, industrial water distribution, and other infrastructure applications.

Standardized Dimensions

AWWA Flanges are manufactured according to established dimensional requirements, providing consistent flange outside diameters, bolt-circle dimensions, bolt-hole arrangements, thicknesses, and bore sizes.

This helps simplify pipeline installation and component matching.

Reliable Sealing Performance

AWWA Flanges provide stable gasket contact and reliable bolted connections when correctly installed.

They are suitable for water transmission, wastewater, cooling water, irrigation, and other water-service applications.

Multiple Flange Classes

AWWA Flanges are available in several classes, including Class B, Class D, Class E, and Class F.

This allows different flange designs to be selected according to pipeline pressure and project requirements.

Economical Design

Ring-Type Slip-On Flanges provide a relatively simple structure that is well suited to large-diameter water pipelines.

This helps reduce fabrication complexity and can provide economical solutions for infrastructure projects.

Easy Installation and Maintenance

The slip-on design simplifies alignment and welding.

Blind Flanges provide removable closures that make inspection, maintenance, and future pipeline expansion easier.

Applications

Municipal Water Supply

AWWA Flanges are widely used in municipal water transmission mains, distribution pipelines, pumping stations, valves, and water-treatment facilities.

Their large-diameter capability makes them particularly suitable for water infrastructure projects.

Wastewater Treatment Systems

Wastewater treatment plants use AWWA Flanges in sewage pipelines, treatment equipment, pumps, valves, and large-diameter piping systems.

Pumping Stations

AWWA Flanges are commonly used to connect pumps, valves, manifolds, and large-diameter pipelines in water pumping stations.

Industrial Water Systems

Industrial plants use large amounts of cooling water and process water.

AWWA Flanges can be used in industrial water distribution, cooling-water pipelines, steel mills, power plants, chemical plants, and manufacturing facilities.

Irrigation Systems

Large agricultural irrigation and water-transfer systems can use AWWA Flanges for pipeline connections, valves, pumps, and equipment.

Desalination and Water Treatment

AWWA Flanges can also be used in desalination facilities and large water-treatment plants where large-diameter steel piping requires reliable bolted connections.

Why Choose Us

AWWA Standards Manufacturing Capability

We manufacture AWWA Flanges according to applicable AWWA C207 dimensional requirements and customer technical specifications.

products can also be manufactured according to ASME/ANSI, EN, DIN, UNI, JIS, BS, GOST, and other international standards.

Comprehensive Production Capabilities

Our integrated manufacturing facilities cover raw material inspection, cutting, forging or plate processing, heat treatment, machining, drilling, surface finishing, testing, marking, and packaging.

This enables consistent quality control throughout the entire manufacturing process.

Large Diameter Manufacturing Capability

We can manufacture AWWA Flanges in large nominal diameters for municipal and industrial water pipeline projects.

Customized outside diameter, bore, flange thickness, bolt-circle diameter, and bolt-hole dimensions can be produced according to customer drawings.

Multiple Material Options

Available materials include carbon steel, stainless steel, alloy steel, and other customized steel grades.

Material certificates can be provided according to project requirements.

Surface Treatment Options

Surface treatment can be supplied according to operating environment and customer specifications.

Available treatments can include:

Protective Oil
Black Painting
Epoxy Coating
Hot-Dip Galvanizing
Customized Coating Systems

Quality Assurance

Our AWWA Flanges undergo dimensional inspection, visual inspection, material verification, and physical and chemical testing when required.

Additional inspections such as ultrasonic testing, magnetic particle testing, PMI, hardness testing, and third-party inspection can also be provided.

International Supply Experience

With experience supplying international industrial markets, we understand different flange standards, project documentation, inspection requirements, packaging specifications, and customized manufacturing needs.

COMPANY PROFILE

Shanxi HongKai Forging Co., Ltd. is located in Dingxiang County, Shanxi Province, China, one of China's important flange and forging manufacturing areas.

We have extensive experience in flange manufacturing and operate integrated production facilities covering forging, plate processing, heat treatment, machining, drilling, physical and chemical testing, surface treatment, packaging, and shipment.

Our production capabilities allow us to control the complete flange manufacturing process from raw material inspection through finished product delivery.

We manufacture flanges according to major international standards including:

ASME B16.5 / ASME B16.47
EN 1092-1
DIN
JIS
UNI
BS
AWWA
GOST

Available materials include carbon steel, stainless steel, alloy steel, duplex stainless steel, and other customized material grades.

Our products are widely supplied to municipal waterworks, wastewater treatment, oil and gas, petrochemical, chemical processing, power generation, industrial water systems, machinery manufacturing, and general industrial piping markets.

 

 

 

 

 

 

FAQ

Q: What are AWWA Flanges?

A: AWWA Flanges are pipeline connection components manufactured according to American Water Works Association standards. They are mainly used in waterworks and large-diameter steel piping systems.

Q: What is the common standard for AWWA Flanges?

A: AWWA C207 is the primary standard commonly used for steel pipe flanges for waterworks service.

Q: What types of AWWA Flanges can you manufacture?

A: We can manufacture Ring-Type Slip-On Flanges, Blind Flanges, and customized AWWA flange products according to customer drawings and project requirements.

Q: What flange classes are available?

A: Common AWWA flange classes include Class B, Class D, Class E, and Class F.

Q: What sizes can you manufacture?

A: AWWA Flanges can be supplied from approximately 4 inches to 144 inches, with customized large-diameter products available according to project requirements.

Q: What materials are available for AWWA Flanges?

A: Common materials include carbon steel, stainless steel, alloy steel, and other customized materials according to customer specifications.

Q: What industries use AWWA Flanges?

A: AWWA Flanges are widely used in municipal water supply, wastewater treatment, pumping stations, industrial water systems, irrigation, desalination, cooling-water pipelines, and other large-diameter water infrastructure projects.

Q: What is the difference between AWWA Flanges and ASME Flanges?

A: AWWA Flanges are primarily designed for waterworks and large-diameter water pipelines, while ASME Flanges are widely used in oil and gas, petrochemical, chemical processing, power generation, steam, and other pressure-piping systems. Their dimensions, design basis, and pressure classifications can differ.

Q: Can AWWA Flanges be customized?

A: Yes. We can manufacture customized AWWA Flanges according to customer drawings, including outside diameter, bore, flange thickness, bolt circle, bolt holes, material, coating, marking, and inspection requirements.

Contact Us

Ready to discuss your AWWA Flanges requirements?

Contact our technical team at kevin.zhao@hkflange.com for technical support, large-diameter flange selection, customized manufacturing, and competitive quotations.