Selecting a flange

Working Pressures:

Working pressures indicated are based on atmospheric temperatures. Refer to specification for additional details on pressure ratings based on other temperatures, and materials as well as gasket and bolt requirements.

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Helpful when Selecting:

When choosing a flange for your application, it is helpful to know that the most commonly available flanges are ASME/ANSI B16.5 and AWWA C207 series flanges. This generally means that these flange selections are the most economical choices.

Domestic Capabilities:

100% US Manufactured Flanges Available on Request.

AWWA THINGS TO KNOW

Note this is a limited summary based on most commonly used AWWA flange types. Please contact CAB, or consult the latest AWWA C207 or C228 specification for more detailed information.

AWWA FLANGE MATERIAL

AWWA flanges may be produced from plate, bar or forged materials. Steel must meet following requirements:

Minimum Tensile Strength 50,000 psi / 345 Mpa Minimum Yield Strength 32,000 psi / 221 Mpa Elongation based on 2" gage length min 18% Elongation based on 8" gage length min 14% Carbon maximum .29 percent Phosphorus maximum .04 percent Sulfur maximum .05 percent

AWWA BOLTING

• Bolts shall be ASTM A193 B7
• Nuts shall be ASTM A194 2H heavy hex or ASTM A563 for 1" and small diameter.
• Washer, if used, must meet ASTM F436

Bolt lengths calculation:

Sum of flange maximum thickness + gasket thickness + washer thickness + depth of nut + 1/4 inch minimum. If using studs, add depth of second nut and washer plus an additional 1/8".

AWWA GASKETS

Rubber gaskets with hardness Shore A 70-85 with gasket seating stress of 200 psi conforming to ASTM D Grade 1 or Compressed Fiber (CFG) or PTFE gaskets may be used and must be suitable for minimum of psi seating stress.

Ring gasket diameters (if not using full face gaskets extending to OD) shall be:

• Inside diameter of ring gasket shall be inside diameter (ID) of flange
• Outside diameter of ring gasket shall be bolt circle diameter minus bolt hole diameter

AWWA TOLERANCES

Outside Diameter (OD) +- 1/8" (3.2mm) Inside Diameter (ID) + 1/16" (1.6mm) -0 Thickness 18" nominal and smaller +1/8 (3.2mm) -0 Thickness 20" nominal and larger +3/16" (4.8mm) -0 Bolt Circle Diameter (BC) +- 1/16" (1.6mm) Bolt Hole Spacing (aka Chord) +- 1/32" (.79mm)

AWWA FLANGE FACING

Flanges are typically supplied with spiral serrated finish with 24-55 grooves per inch. Concentric serrated finish may be available by special order though it is rarely used. A cutting tool of .06" radius or less should be used, yielding 125-500 RMS (3.2-12.7 RA) roughness.

AWWA DRILLING

• For flanges up to and including 84" nominal, bolt holes are drilled 1/8" (3.2mm) larger than the diameter of the bolt/stud.
• Flanges above 84" nominal are drilled 3/16" (4.8 mm) larger than bolt/stud diameter.
• Bolt holes may be drilled 1/8" larger diameter to accommodate insulators or alignment when needed.

AWWA Test Pressures are 1.5 times flange pressure ratings.

ASME/ANSI B16.5 THINGS TO KNOW

Note this is a limited summary based on most commonly used flange types. Please contact CAB, or consult the latest ASME/ANSI B16.5 specification for more detailed information.

ASME/ANSI B16.5 FLANGE MATERIAL

Most common carbon steel materials used on B16.5 flanges are A105, A350 LF2, A 515-70 (Blinds Only), A 516-70 (Blinds Only).

ASME/ANSI B 16.5 GASKETS

B16.5 specification allows for several types of gaskets depending on operating environment. Consult specification for details.

ASME/ANSI B 16.5 BOLTING

ASTM A193 B7 bolts are commonly used as the minimum strength requirement on bolting for ASME/ANSI B16.5 flanges. The specification allows for other options based on flange pressure class.

ASME/ANSI B16.5 TEST PRESSURE

Test pressures on B16.5 flanges are 1.5 times of pressure rating.

ASME/ANSI B16.5 MARKING

CAB supplied B16.5 flanges will be marked B16.5, pressure class, material grade, heat # and mfr.

ASME/ANSI B16.5 TOLERANCES

(Partial listing of common slip on flange tolerances; more details in ASME/ANSI B16.5 specification)

Outside Diameter - Inside Diameter 10" nominal and smaller +.03" -0 Inside Diameter 12" nominal and larger +.06" -0 Thickness 18" nominal and smaller +.12" -0 Thickness 20" nominal and larger +.19" -0 Bolt Circle - Bolt Hole Spacing - Bolt Circle Concentricity - 2.5" and smaller .03" Bolt Circle Concentricity - 3" and larger .06"

ASME/ANSI B16.5 FLANGE FACING

B16.5 flanges are typically supplied with a raised face, which is added to the minimum flange thickness (thickness through bolt hole). For Class 150 and 300 .06" is added. For Class 400, 600, 900, and , .25" raised face is added.

Flat faced flanges are available. Flange faces are typically supplied with a spiral serrated finish of 44-55 grooves per inch with RMS of 125-250 (3.2 to 6.3 RA) finish.

ASME B16.47 THINGS TO KNOW

Note this is a limited summary based on most commonly used flange types. Please contact CAB, or consult the latest ASME B16.47 specification for more detailed information.

ASME B16.47 FLANGE MATERIAL

Most common carbon steel materials used on B16.47 flanges are A105, A350 LF2, A 515-70 (Blinds Only), A 516-70 (Blinds Only).

ASME B16.47 GASKETS

Nonmetallic gaskets should conform to ASME B16.21; Metallic gaskets should conform to ASME B16.20.

ASME B16.47 BOLTING

ASTM A193 B7 bolts are commonly used as the minimum strength requirement on bolting for ASME B16.47 flanges. The specific allows for other options based on flange pressure class.

ASME B16.47 TEST PRESSURE

Flanges are not required to be pressure tested.

ASME B16.47 MARKING

CAB supplied B16.47 flanges will be marked B16.47, pressure class, material grade, heat # and mfr.

ASME B16.47 TOLERANCES

(Partial listing of common slip on flange tolerances; more details in ASME B16.47 specification)

Inside Diameter 10" nominal and smaller +.03" -0 Inside Diameter 12" nominal and larger +.06" -0 Thickness of Flange through bolt hole 1" or less +.12" -0 Thickness of Flange through bolt hole >1" to 2" +.19" -0 Thickness of Flange through bolt hole >2" to 3" +.31" -0 Thickness of Flange through bolt hole >3" +.38" -0 Bolt Circle .06" Bolt Hole Spacing .03" Bolt Circle Concentricity .06"

ASME B16.47 FLANGE FACING

B16.47 flanges are typically supplied with a raised face, which is added to the minimum flange thickness (thickness through bolt hole). For Class 75, 150 and 300 .06" is added. For Class 400, 600 and 900, .25" raised face is added. Flat faced flanges are available on request.

Flange faces are typically supplied with a spiral serrated finish of 44-55 grooves per inch with RMS of 125-250 (3.2 to 6.3 RA) finish.

ASME B 16.47 Series A was formerly known as MSS SP 44 specification. Series B was formerly known as API 605 specification. Now both have been combined and included in ASME B16.47 specification.

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OTHER

Lightweight

Class 125 lightweight flanges are not governed by a flange specification. They are a hub designed slip on type flange with drilling that matches 150# or 125# drill pattern. The flanges do not have an official pressure rating, however, early AWWA specifications had a Table 2, Class D hub type slip on that is same dimensions and pressure rating for that flange as 150psi.

Ductile Iron

Ductile Iron backup flanges do not have a flange specification. They are considered "unrated" flanges for use on non-pressure type applications. Drilling pattern matches 150# or 125# drilling.

Pressure Vessel

Pressure vessel flanges are designed per ASME Section VIII and are designed for pressure vessel use. They are only rarely used and are generally built to order.

Tubeturns

Tubeturns 150# and 300# slip on flanges were originally designed by Tubeturns and appeared in their flange catalog for many years. Drill patterns were designed to match up to common valve drilling patterns 150# and 125# and 300# and 250# patterns.

The Ultimate Guide to AWWA C207 Compliance: Edition

Table of Contents

What is AWWA C207

AWWA C207 is a standard developed by the American Water Works Association (AWWA) that covers steel ring flanges, blind flanges, and companion flanges for waterworks service. These flanges are typically used in low-pressure water systems, such as municipal water distribution networks, and are designed to meet the specific needs of the water industry.

Size: 4-144#

Types:

Steel-ring flanges, Class B (86 psi)  Blind-flanges, Class B (86 psi)  Steel-hub flanges, Class D (175–150 psi) Steel-ring flanges, Class D (175–150 psi) Blind-flanges, Class D (175–150 psi) Steel-hub flanges, Class E (275 psi) Steel-ring flanges, Class E (275 psi) Blind-flanges, Class E (275 psi) Steel-ring flanges, Class F(300 psi) Blind-flanges, Class F(300 psi)

AWWA 207 pdf free download:

MATERIALS

Materials shall comply with the requirements of the Safe Drinking Water Act and other federal regulations for water systems as applicable.

AWWA C207 flanges are typically made from carbon steel suitable for waterworks applications.

Manufacturing Methods

Flanges shall be made from seamless forgings, cut from plate as a single piece, welded bar rings, or segmented and welded plates.
Flange materials. Steel plate, bar, and forgings used in the manufacture of flanges shall meet the following requirements:

• 1. Specified minimum tensile strength = 50,000 psi (345 MPa).
• 2. Specified minimum yield strength = 32,000 psi (221 MPa).
• 3. Elongation, 2-in. (50-mm) gauge length (minimum) = 18 percent, or 8-in. (200-mm) gauge length (minimum) = 14 percent.
• 4. Carbon (maximum) = 0.35 percent.
• 5. Phosphorus (maximum) = 0.04 percent.
• 6. Sulfur (maximum) = 0.05 percent.

MARKING

Flanges shall be impression stamped with the size and name or trademark of the manufacturer and with the AWWA class as defined in flange dimensions table.

FLANGE DIMENSIONS

Dimensions are in INCH

Steel-ring flanges, Class B (86 psi) and Class D (175–150 psi) Steel-ring flanges, Class E (275 psi) Steel-ring flanges, Class F(300 psi) B/D/E/F Blind-flange thickness Steel-hub flanges, Class D (175–150 psi) Steel-hub flanges, Class E (275 psi) Steel-ring flanges, Class B (86 psi) and Class D (175–150 psi)

Steel-ring flanges, Class B (86 psi) and Class D (175–150 psi)

Steel-ring flanges, Class E (275 psi)

AWWA standard steel-ring flanges, Class E (275 psi)

Steel-ring flanges, Class F(300 psi)

AWWA standard steel-ring flanges, Class F(300 psi)  

B/D/E/F Blind-flange thickness

B/D/E/F Blind-flange thickness

Steel-hub flanges, Class D (175–150 psi)

AWWA standard steel-hub flanges, Class D (175–150 psi)

Steel-hub flanges, Class E (275 psi)

AWWA standard steel-hub flanges, Class E (275 psi)

More information

https://engage.awwa.org/PersonifyEbusiness/Bookstore/AWWA-C207-23-Steel-Pipe-Flanges-for-Waterworks-Service-Sizes-4-In-Through-144-In-100-mm-Through--mm/ProductDetail/

FAQ

Steel-ring flanges (Classes B, D, E, F)
Blind flanges (Classes B, D, E, F)
Steel-hub flanges (Classes D, E)

Class B: 86 psi
Class D: 175–150 psi
Class E: 275 psi
Class F: 300 psi

AWWA C207 flanges are commonly used in potable water systems, wastewater treatment plants, and other low-pressure waterworks applications.

Most AWWA C207 flanges have a flat face, but raised face options are also available for specific applications.

No, AWWA C207 flanges are designed for low-pressure applications with maximum ratings up to 300 psi, depending on the class.

AWWA C207 flanges have different design criteria and pressure ratings compared to ASME flanges, so they are not always directly compatible. Always consult the specific standards and application requirements.

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