As per AWWA C207-01, Sec 4.1, flanges shall be made from seamless forgings, cut from plate as a single piece, welded bar rings or segmented and welded plates as per C207-01 Sec 4.2.4.
Forgings shall meet the minimum requirements or ASTM A105 or A181.
Steel plate or bar used in the manufacture of flanges shall meet the following requirements:
1. Tensile strength = 50,000 psi (345 mpa) (min.)
2. Yield strength = 32,000 psi (221 mpa) (min.)
3. Carbon = 0.29 percent (max.)
4. Phosphorous = 0.04 percent (max.)
5. Sulfur = 0.05 percent (max.)
Plate steel designations that will meet the previously listed requirements include but are not limited to the following designation: 1. A36
2. A516, grade 60, 65, and 70
Pacific Coast Flange Inc will provide mill test reports showing conformance to the physical and chemical requirements for all flanges ordered.
Forgings shall meet the minimum requirements or ASTM A105 or A181.
Steel plate or bar used in the manufacture of flanges shall meet the following requirements:
1. Tensile strength = 50,000 psi (345 mpa) (min.)
2. Yield strength = 32,000 psi (221 mpa) (min.)
3. Carbon = 0.29 percent (max.)
4. Phosphorous = 0.04 percent (max.)
5. Sulfur = 0.05 percent (max.)
Plate steel designations that will meet the previously listed requirements include but are not limited to the following designation: 1. A36
2. A516, grade 60, 65, and 70
Pacific Coast Flange Inc will provide mill test reports showing conformance to the physical and chemical requirements for all flanges ordered.
Flange Facing
As per AWWA C207-01 Sec 4.2.2, all AWWA flanges shall be flat-faced without projection or raised area of face. Either a serrated concentric or serrated spiral finish having from 24 grooves per inch to 470 grooves per inch shall be used. The cutting tool employed shall have an approximate 0.06 inch or larger radius. The resultant surface finish shall have a 250 to 500-uin. roughness.
Drilling Templates
As per AWWA C207-01 Sec. 4.2.3 drilling templates are in multiples of four so that fittings can be make to face any quarter. Bolt holes shall straddle the center line, except where special mating conditions exist and shall be drilled 1/8 in. (3.2mm) larger in diameter than the nominal diameter of the bolt, except on flanges larger that 84 inches (2,100mm) diameter, bolt holes shall be drilled 3/16 inches (4.8mm) larger than the nominal bolt diameter. Bolt holes may be over drilled by an additional 1/8 in (3.2mm) to accommodate insulators or to facilitate alignment with the mating flange.
Flange Marking
Flanges shall be steel stamped with the trademark, nominal size, class, material designation and material heat number.
| 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 Flange Charts and Drawings
 Ring Flange  | Standards, Dimensions & Weight |
