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AWWA Standard flange

AWWA Flange Standards differ from ANSI (American National Standards Institute) and ASME (American Society of Mechanical Engineers) certifications in a variety of ways, the most important being their specificity: AWWA standards evaluate properties that particularly affect potable water use, as opposed to broader industrial flange applications.

Our company provides an array of AWWA flanges to meet your application’s specifications.

General Information

American Water Works Association (AWWA) is an international non-profit, scientific and educational association founded to improve water quality and supply. Established in 1881, it has a membership (as of 2012) of around 50,000 members worldwide.

These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise.

Dimensional tolerances for AWWA Standard flanges

These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise.

Listed below are the Dimensional Tolerances to which flanges are manufactured.    The limits given are maximum. 

Rigid inspection procedure assures the maintenance of high standards of accuracy in regular day to day production.

Ring type Slip-on and Blind flanges HUB type slip-on
O.D. <=24" +/- 0.6"(1.6mm) O.D. <=24" +/- 0.6"(1.6mm)
>24" +/- .12"(3.2mm) >24" +/- .12"(3.2mm)
I.D. Socket-Welding 10" and Samller
+.03"(0.8mm),-0"
I.D. 10" and Samller +.03"(0.8mm)
Slip-on and
Lap Joint
12" and Larger
+.06"(1.6mm),-0"
12"-18" +/-.06"(1.6mm)
20"-42" +.12"(3.2mm)
+.06"(1.6mm)
O.D. of Hub <=12" +.09"(2.4mm),
-.06"(1.6mm)
Diameter of
Contact Face
0.06" Raised Face +/-.03"(0.8mm)
14"-42" +/-.12"(3.2mm)
Diameter of Contact face 0.06" Raised Face +/- .03"(0.8mm) Diameter of Hub at base X<=24" +/-.06"(1.6mm)
X>24" +/-.12"(3.2mm)
Deameter of Contact face <=10" +.03"(0.8mm),
-0"
Diameter of Hub at point of Welding <=5" +.09"(2.4mm),
-.03"(0.8mm)
12"-42" +.06"(1.6mm),
-0"
>=6" +.16"(4.0mm),
-.03"(0.8mm)
Drilling Bolt Circle 1/2"-24"
/26"-42"
Drilling Bolt Circle 1/2"-24"
/26"-42"
+/-.06"(1.6mm)
+/-.06"
+/-.06"(1.6mm)
+/-.06"
Bolt hole
spacing
+/-.03"(0.8mm)
Bolt hole
spacing
+/-.03"(0.8mm)
Eccentricity of Bolt circle with respect to bore .03" Max.
(0.8mm)
Eccentricity of Bolt circle with respect to bore .03" Max.
(0.8mm)
Thickness 18"& Small +.12"(3.2mm),-0" Thickness 18"& Small +.12"(3.2mm),-0"
20"-42" +.19"(1.6mm) 20"-42" +.19"(1.6mm)
Length Thru Hub <=10" +/-.06"(1.6mm) Length Thru Hub <=10" +/-.06"(1.6mm)
12"-42" +/1.12"(3.2mm) 12"-42" +/1.12"(3.2mm)

AWWA Vs. ANSI Flange Standards

Both the AWWA and ANSI have thorough standards for flanges, and the two standards are different in several ways.

AWWA standards provide flange properties intended for potable water use only. In contrast, ANSI standards are aimed at industrial flange applications.

For example, AWWA flange ratings are applicable only at atmospheric temperature, while ANSI ratings cover flange installations from -20°F to 1500°F. AWWA standards provide flange properties intended for potable water use only. In contrast, ANSI standards are aimed at industrial flange applications. For example, AWWA flange ratings are applicable only at atmospheric temperature, while ANSI ratings cover flange installations from -20°F to 1500°F.

ANSI covers numbered class flanges from 150 to 2500, and AWWA standards encompass lettered flange classes B, E, F, and the commonly used class D connection. AWWA provides ratings for a much broader range of nominal pipe sizes (3″-144″) than ANSI provides (1/2″-24″).

Finally, ANSI and AWWA flange standards differ in the breadth of applications discussed. ANSI includes information for welded auxiliary connections and tapping, while AWWA does not address those installations. Also, the AWWA standard only encompasses ring, hub type, blind flanges, and threaded iron flanges while the ANSI standard inlcudes all flange types.

This discussion on AWWA flange standards and ANSI flange standards is based on information from ANSI/AWWA C115/A21.15-99: “American National Standard for Flanged Ductile-Iron Pipe with Ductile-Iron or Gray-Iron Threaded Flanges”, ANSI/AWWA C207-94: “AWWA Standard for Steel Pipe Flanges for Waterworks Service-Sizes 4 In. Through 144 In.”, and ANSI B16.5-1981: “Pipe Flanges and Flanged Fittings”.

Note:

  1. Ring flanges available overbored or counterbored per customer specification.
  2. Bolt holes shall be drilled 1/8th inch larger in diameter than the nominal diameter of the bolt, except for flanges larger than 84 inch in diameter which shall be drilled 3/16th inch larger than the nominal diameter of the bolt.
  3. Drilling same as ANSI/ASME B16.1 125 lb and B16.5 150 lb pattern.
  4. Flanges available overdrilled to accommodate insulators.
  5. AWWA recommends the use of dished head assemblies as alternate to blind flanges, sizes over 72″ nominal.
  6. AWWA C207-01 Class B and D Hub Flanges are identical to Industry Standard Class 125 Light Weight Flanges.

American Water Works Association

American Water Works Association (AWWA) is an international non-profit professional organization founded to improve water quality and supply. Established in 1881, it has a membership (as of 2010) of around 56,000 members worldwide.

AWWA members include:

water utilities, treatment plant operators and managers, scientists, environmentalists, manufacturers, academics, regulators, and others with an interest in water supply and public health.

Water industry resources

Through QualServe, a voluntary quality improvement program for water utilities, AWWA helps water and waste water facilities improve overall operations. QualServe provides a self-assessment instrument, peer review and benchmarking to help utilities evaluate themselves and enhance performance. AWWA also works with the USEPA and other government agencies to improve operator certification and build other professional standards.

AWWA offers opportunities for people to meet, learn, and network at the international, national, and section levels. In addition to publications and conferences for water professionals, AWWA hosts a variety of workshops, symposia, teleconferences, and programs focused on specific aspects of water stewardship. In cooperation with other professional associations, AWWA is a resource for water professionals’ continuing education and development.

Awards

AWWA presents a number of awards every year to individuals who provide notable service to the drinking water community. Some of the major awards given include the Abel Wolman Award of Excellence and the George Warren Fuller Award.

sunnysteel

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.

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