AWWA and Plate Steel Flanges 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.

AWWA flange

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

Most common flange types

Regardless of custom sizing or specifications, the fundamental design of most flanges falls under six common styles created to close, connect, cover, or support pipes and pipe systems.

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.

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”.

Material Grades and Performance

Custom pipe flanges can be manufactured from a wide variety of materials and material grades.

Stainless steel flange
Alloy Steel flanges accord to ASTM A182 F1, F5a, F9, F11, F12, F22, F91
Carbon Steel Flanges
Forged steel flange

Carbon steel is a popular solution, as are stainless steel and specialty alloys, depending upon the industry. Plate and forged are also common, as are titanium and aluminum for lightweight jobs.

Flange connection
Pipeline & fittings with flanges

Pipe Flange helps to connect piping components in a piping system with the use of bolted connections and gaskets.

Flanges Manufacturing Process

Our manufacturing process is highly sophisticated and is divided into various departments supervised by experienced industry experts.

Raw material

1. Raw Material

  • Raw Material Check
  • Quantity Check
  • Visual & Dimension Check

2. Material Inspection

  • Chemical Analysis Check
  • Preservation Analysis Certificate
Steel material cutting

3. Material Cutting

  • Weight Measuring
  • Cut Surface Check
  • Marking
Flange forging

4. Flange forging

  • Material Grade Check
  • Weight Measuring
  • Temperature Control
Heat Treatment

5. Heat Treatment

  • Normalizing
  • Tempering, Q.T
  • Solution Treatment
  • Mechanical Test
Forging Rolling

6. Forging Rolling

  • Material Grade Check
  • Weight Measuring
  • Temperature Check
  • Dimension Check
Final Inspection

7. Final Inspection

Rust Prevention

8. Rust Prevention

  • Preserve Check
  • Marking on the flange
  • Tectyl 506or Pickling or etc. Coating
Well packing

9. WellPacking

  • Packing Spec. Check
  • Packing Inspection
  • Delivery

Requirements are valid for normal situation, in special you have to contact us to introduce.

Raw Materials:
The usual materials of flanges include stainless steel, carbon steel, aluminum and plastic.

Beginning with this process,the system controls the quality of all incoming materials as per the raw material test certificate of the material. Mild Steel Flanges ( MS ) are of premium quality that ensures high durability, strength and resistivity to varied non-supporting conditions. Also, checking in each size for chemical and physical properties of these materials at Government approved laboratory.

Flange materials acc. to ASTM

Dimensions from carbon steel and stainless steel flanges are defined in the ASME B16.5 standard. The material qualities for these flanges are defined in the ASTM standards.

The Packing Works for Steel Flanges>>

Steel flanges must be packed with seaworthy packing method then delivery to customers, usually the packing way include wooden box, wooden pallet, iron & steel cage, iron & steel pallet etc. Because of the normal wooden boxes or wooden pallets have to do fumigation treatment, we usually use plywood pallet or plywood case or box to pack steel flanges without fumigation treatment. Whatever plywood or iron & steel packing way, they must be seaworthy, strong, waterproof and easy for loading and unloading.

Marking on the flange
Shipping mark stick to outside of package. Following shall be marked on flange body

Mark on the flange

 

  • Manufacturer logo
  • ASTM material code
  • Material Grade
  • Service rating (Pressure-temperature Class))
  • Size
  • Thickness (Schedule)
  • Heat No
  • Special marking if any QT (Quenched and tempered) or W (Repair by welding)


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