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Rm906 building B, Xinke International Yuhua District
The AWWA C207 specification covers carbone steel ring type slip on flanges and blind flanges.
rnrnGeneral Information about AWWA FlangesrnrnAWWA flanges are commonly used in waterworks, wastewater, slurry, plant piping or other light duty applications generally requiring pressures of less than 300 psi. Pressure ratings for AWWA flanges range from the Class B flange rated at 86 psi to Class F flanges, both rated at 300 psi. Class D flanges are by far the most commonly specified among AWWA flange users, and carry a pressure rating of 175 psi for sizes below 12", and 150 psi for sizes 12" and larger.
rnrnThe use of AWWA ring type steel flange has long been accepted for steel and concrete piping systems, and more recently with polyethylene piping, as a backup ring. When used with low pressure piping, AWWA flanges can frequently offer the user a cost savings over common forged flanges (typically ANSI B16.5 hub type flanges) which are generally designed for higher pressure applications such as oil, steam, chemical, etc.
rnrnFlange MaterialrnrnThe AWWA C207 specification does not require a specific grade of steel. Instead it establishes minimum physical and chemical properties as follows:
rnrnMinimum Tensile 50,000 psi
rnrnMinimum Yield 32,000 psi
rnrnElongation 2" - 18%; 8" - 14"
rnrnMaximum Carbon .29%
rnrnMaximum Phosphorus .04 %
rnrnMaximum Sulfur .05 %
rnrnFrequently used materials might include: ASTM A-36 or ASTM A-283 plate steels or ASTM A181 or A105 forged steel meeting the requirements of AWWA C207.
rnrnFlange FacingrnrnFlanges shall have a serrated finish of approximately 24 to 55 grooves per inch resulting in a 125-500 RMS surface finish. Serrations may be spiral or concentric. Other types of facings are also available upon request. AWWA flanges are normally supplied as flat faced, unless raised face is specified by customer.
rnrnDrilling TemplatesrnrnDrilling templates are in multiples of four so that fittings may be made to face any quarter. Bolt holes straddle the center line. For flanges up to 84" holes are drilled 1/8 inch larger in diameter than the diameter of the bolt. For flanges larger than 84" holes are drilling 3/16" larger than the bolt diameter. Bolt holes may also be oversized by an additional 1/8" to accommodate insulators or to facilitate alignment.
rnrnFlange MarkingrnrnCAB flanges are customarily stamped with the trademark, nominal size, class, material designation and heat.
rnrnFlange TolerancesrnrnInside Diameter + 1/16" - 0
rnrnOutside Diameter +- 1/8"
rnrnThickness (18" and smaller) + 1/8" -0
rnrnThickness (20" and larger) +3/16" -0
rnrnBolt Circle Diameter +- 1/16"
rnrnBolt Hole Spacing +- 1/32"
CONTACT PERSON :marina
COMPANY:Shijiazhuang Jinmo Pipeline Technology Co.,Ltd
ADDRESS:Rm906 building B, Xinke International Yuhua District
TELEPHONE:+86 311 8388 6935
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