Since the first edition of the AWWA Standard C207 was printed in 1952, AWWA flanges have commonly been used in waterworks, wastewater, slurry, plant piping, and different mild obligation purposes. Pressure rankings for AWWA flanges range from the category B flange rated at 86 psi to the class F flange rated at 300 psi. The AWWA C207-01 customary describes two types of slip-on flanges, ring type and hub type that could be used interchangeably if the dimensions given in the usual are used. The standard additionally describes blind flanges. Flanges described within the AWWA C207-01 tables are supposed to be used with steel pipe, fittings or appurtenances meeting the necessities of ANSI/AWWA C200, ANSI/AWWA C208, ASTM A134, ASTM 139, or other equal requirements. It is further meant that these flanges be hooked up by welding in accordance with AWWA C207-01 Sec.4.3.
As per AWWA C207-01 Sec. 1.3, the stress ratings listed for AWWA Class B, D, E and F flanges are for circumstances and temperatures customary in water utility companies. The pressure scores for the flange should be primarily based on the design of the maximum operating stress plus the anticipated certain pressure. Test pressures mustn’t exceed 125 percent of the ratings. Flange design is predicated on strain issues, not for stresses induced by exterior moments when pipe acts as a beam. The tables of the AWWA C207-01 normal have been developed using a design stress of 16,000 psi for the working strain design.
As per AWWA C207-01, Sec 4.1, flanges shall be made from seamless forgings, minimize 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 minimal requirements or ASTM A105 or A181.
Steel plate or bar used within the manufacture of flanges shall meet the following necessities:
1. Tensile strength = 50,000 psi (345 mpa) (min.)
2. Yield energy = 32,000 psi (221 mpa) (min.)
3. Carbon = 0.29 percent (max.)
4. Phosphorous = 0.04 percent (max.)
5. Sulfur = 0.05 % (max.)
Plate steel tube designations that can meet the beforehand listed requirements embrace however are not restricted to the following designation: 1. A36
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Pacific Coast Flange Inc will present mill check studies showing conformance to the physical and chemical necessities for all flanges ordered.
As per AWWA C207-01 Sec 4.2.2, all AWWA flanges shall be flat-confronted without projection or raised area of face. Either a serrated concentric or serrated spiral end having from 24 grooves per inch to 470 grooves per inch shall be used. The slicing instrument employed shall have an approximate 0.06 inch or larger radius. The resultant floor end shall have a 250 to 500-uin. roughness.
As per AWWA C207-01 Sec. 4.2.Three drilling templates are in multiples of 4 in order that fittings may be make to face any quarter. Bolt holes shall straddle the middle line, except the place particular mating circumstances exist and shall be drilled 1/eight in. (3.2mm) bigger 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/sixteen inches (4.8mm) larger than the nominal bolt diameter. Bolt holes may be over drilled by an extra 1/8 in (3.2mm) to accommodate insulators or to facilitate alignment with the mating flange.
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