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AWWA C207 is the specific standard covering steel ring flanges for waterworks service. It defines the design, materials, dimensions, pressure ratings, and testing requirements for slip-on and blind flanges used in large-diameter water pipelines - sizes that ASME B16.5 does not cover or is not optimized for.
CNCJ manufactures AWWA C207 steel ring flanges for water infrastructure projects worldwide. Available in Class B, D, E, and F, sizes NPS 4" to NPS 96", in carbon steel and stainless steel. All flanges are produced to the current AWWA C207 edition with MTC EN 10204 3.1 as standard.
|
Class |
Pressure Rating |
Size Range |
Flange Type |
Face Type |
Primary Use |
|
Class B |
86 psi (6 bar) |
4"–144" |
Slip-On Ring |
Flat Face |
Low-pressure buried mains |
|
Class D |
150 psi (10 bar) |
4"–144" |
Slip-On Ring/Hub |
Flat Face |
Standard water mains |
|
Class E |
150 psi (10 bar) |
4"–144" |
Slip-On Ring/Hub |
Flat Face |
Heavy-duty, large diameter |
|
Class F |
300 psi (21 bar) |
4"–96" |
Slip-On Hub / |
Flat or Raised Face |
Pump stations, high pressure |
|
AWWA C207 Flange |
|
|
Material |
SS304, SS316, SS304L, SS316L, SS321, SS310 ,1.4401, 1.4403 |
|
Type |
Table2, Table 3, Table 4 |
|
Class |
Class B, Class D |
|
Standard |
AWWA C207 |
|
Size |
1/2"NB to 48"NB |
|
Connection |
FF |
|
Application |
For Water, Oil and Gas Industrial |
|
Certificate |
CE / ISO / SGS |
AWWA C207 vs ASME B16.5: Can They Be Used Together?
- Class D bolt holes for NPS 4"–24" are identical to ASME B16.5 Class 150.
- But face types differ: AWWA uses Flat Face; ASME B16.5 uses Raised Face.
- When mating, you must use a full-face gasket - ring gaskets will leak.
- Above NPS 24", ASME B16.5 has no matching specs; refer to ASME B16.47.
AWWA C207 Flange Applications
AWWA C207 flanges are used exclusively in water-related infrastructure.
Municipal Water Transmission Mains
The primary application. Large-diameter water mains (typically 12" and above) connecting reservoirs, treatment plants, and distribution networks. Class D is the standard specification for most transmission main projects.
Water Treatment Plants
Interconnecting piping within water treatment and wastewater treatment facilities, including filter trains, clarifiers, and chemical dosing systems. Class D and Class F are both commonly used depending on the pressure zone.
Pump Stations
Pump discharge lines require higher pressure ratings - Class F at 300 psi is the standard choice for the high-pressure side of pump installations. The availability of raised face and weld neck options in Class F makes it compatible with industrial pump specifications.
Reservoir and Dam Outlet Works
Large-diameter outlet and bypass piping for reservoirs and dams. The very large sizes covered by AWWA C207 (up to 144") make it uniquely suited for major water storage infrastructure.
Irrigation and Agricultural Water Systems
Large-scale irrigation infrastructure, particularly in western North America and export markets, often specifies AWWA C207 for the main distribution pipelines.
Process Flow
FAQ
Q: What does AWWA stand for in pipe?
A: AWWA stands for the American Water Works Association. In piping, AWWA refers to a family of standards developed specifically for water supply and distribution infrastructure, including C207 (steel flanges), C110 (ductile iron flanges), and C228 (stainless steel flanges).
Q: What is the pressure rating of AWWA C207 Class F?
A: AWWA C207 Class F is rated at 300 psi (approximately 21 bar) cold working pressure. It is the highest-rated class within C207, available in sizes NPS 4" to NPS 96", and is primarily used for pump station discharge piping and other high-pressure segments of water systems.
Q: Can AWWA C207 Class D flanges be used with ASME B16.5 Class 150 flanges?
A: The bolt circle diameter and bolt hole count match for sizes NPS 4" through NPS 24", so they can be bolted together in these sizes. However, AWWA C207 uses a flat face with full-face gaskets, while ASME B16.5 Class 150 uses a raised face with ring gaskets. Direct mating without a flat-face adapter risks gasket damage. Always use a full-face gasket and confirm face compatibility before connecting the two standards.
Q: What is the difference between AWWA C207 Class D and Class E?
A: Both Class D and Class E carry a 150 psi pressure rating, but Class E uses a thicker flange plate. The added thickness provides greater flange rigidity, which is important for large-diameter sizes (above 36") where a thinner flange may deflect under bolt load and compromise the gasket seal. Class E is specified when additional stiffness is required beyond what Class D provides.
Q: What is the difference between AWWA C207 and AWWA C228?
A: AWWA C207 covers carbon steel flanges for waterworks service. AWWA C228 is the equivalent standard for stainless steel flanges - used when corrosion resistance is required, such as in seawater desalination, aggressive groundwater treatment, or coastal installations. The two standards share similar dimensional logic and are designed to be used together in the same water system.
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