Alloy Pipes And Seamless Tubes: AWWA And Plate Steel Flanges General Information

Since the primary 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 functions. Pressure rankings for AWWA flanges range from the class B flange rated at 86 psi to the category F flange rated at 300 psi. The AWWA C207-01 standard describes two kinds of slip-on flanges, ring sort and hub sort which may be used interchangeably if the dimensions given in the usual are used. The usual additionally describes blind flanges. Flanges described in the AWWA C207-01 tables are intended for Alloy Sheet use with steel rod pipe, fittings or appurtenances assembly the necessities of ANSI/AWWA C200, ANSI/AWWA C208, ASTM A134, ASTM 139, or different equivalent standards. It is additional intended 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 scores listed for AWWA Class B, D, E and F flanges are for conditions and temperatures customary in water utility companies. The strain rankings for the flange should be primarily based on the design of the maximum operating pressure plus the anticipated certain strain. Test pressures should not exceed 125 p.c of the ratings. Flange design is predicated on strain concerns, not for stresses induced by exterior moments when pipe acts as a beam. The tables of the AWWA C207-01 standard have been developed using a design stress of 16,000 psi for the working strain design.Flange Material

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 xt_blog 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 within the manufacture of flanges shall meet the next requirements:

1. Tensile power = 50,000 psi (345 mpa) (min.)

2. Yield energy = 32,000 psi (221 mpa) (min.)

3. Carbon = 0.29 % (max.)

4. Phosphorous = 0.04 p.c (max.)

5. Sulfur = 0.05 % (max.)

Plate steel designations that can meet the previously listed requirements embrace but should not restricted to the following designation: 1. A362. If you have any issues regarding exactly where and how to use alloy sheet;,, you can speak to us at the web site. A516, grade 60, 65, and 70

Pacific Coast Flange Inc will provide mill take a look at reports exhibiting 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 with out 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 end 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 4 so that fittings might be make to face any quarter. Bolt holes shall straddle the middle line, alloy pipe besides the place special mating situations exist and shall be drilled 1/8 in. (3.2mm) bigger in diameter than the nominal diameter of the bolt, besides on flanges larger that eighty four inches (2,100mm) diameter, bolt holes shall be drilled 3/sixteen inches (4.8mm) larger 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.

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