Alloy Pipes And Seamless Tubes: AWWA And Plate Steel Flanges General Information
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, pipe fitting supply and steel bar different gentle obligation purposes. Pressure scores for AWWA flanges range from the class B flange rated at 86 psi to the class F flange rated at 300 psi. The AWWA C207-01 customary describes two forms of slip-on flanges, ring sort and hub type that may be used interchangeably if the dimensions given in the usual are used. The usual also describes blind flanges. Flanges described in 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 different equal requirements. It’s additional supposed that these flanges be attached by welding in accordance with AWWA C207-01 Sec.4.3.Pressure Ratings
As per AWWA C207-01 Sec. 1.3, the pressure ratings listed for AWWA Class B, D, E and F flanges are for conditions and temperatures customary in water utility providers. The strain ratings for the flange ought to be based on the design of the utmost working stress plus the anticipated sure stress. Test pressures should not exceed 125 % of the ratings. Flange design is based on stress concerns, not for stresses induced by exterior moments when pipe acts as a beam. The tables of the AWWA C207-01 commonplace have been developed using a design stress of 16,000 psi for alloy sheet the working strain design.Flange Material
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 necessities or ASTM A105 or A181.
Steel plate or bar used within the manufacture of flanges shall meet the following requirements:
1. Tensile energy = 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 p.c (max.)
5. Sulfur = 0.05 percent (max.)
Plate steel designations that may meet the previously listed requirements embody but are usually not restricted to the following designation: 1. A362. A516, grade 60, 65, and 70
Pacific Coast Flange Inc will provide mill check experiences exhibiting conformance to the bodily and chemical requirements for all flanges ordered.Flange Facing
As per AWWA C207-01 Sec 4.2.2, all AWWA flanges shall be flat-confronted without projection or raised space 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 instrument 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 could be make to face any quarter. Bolt holes shall straddle the middle line, besides the place special mating conditions exist and shall be drilled 1/eight in. (3. Should you have any concerns with regards to wherever as well as tips on how to utilize Pipe Fitting Supply, you can call us from the page. 2mm) larger in diameter than the nominal diameter of the bolt, except on flanges bigger that eighty four inches (2,100mm) diameter, bolt holes shall be drilled 3/16 inches (4.8mm) bigger than the nominal bolt diameter. Bolt holes could also be over drilled by a further 1/8 in (3.2mm) to accommodate insulators or to facilitate alignment with the mating flange.
