ANSI flange dimensions are special equipment for the use of construction materials in piping systems not specified in ANSI/ASME B16.5. Its systems accurately measure strength, strain, and pressure to ensure the safety and integrity of a variety of materials in the workplace. ANSI flanges are available in nominal pipe sizes (NPS) and pressure ratings, including 150, 300, 600, 900, 1,500, and 2,500 psi. ANSI flange dimensions also vary by type, including welded neck, slip-on, or blind flanges. This standardization ensures reliable performance and compatibility in industries such as oil and gas, water treatment, chemical processing, and power generation.
ANSI Flange Dimensions Types
Flange Type | Description |
Weld Neck | A flange with a tapered neck for welding to a pipe; provides strong connections and is suitable for high-pressure applications. |
Slip-On | A flange designed to slide over the pipe; easier to align but requires fillet welding to secure it. |
Blind | A solid flange used to seal the end of a piping system; prevents flow and allows for easy access for maintenance. |
Socket Weld | A flange with a socket for inserting the pipe; commonly used for small-diameter piping. |
Threaded | A flange with internal threads for connection to threaded pipes; allows for easy assembly and disassembly without welding. |
Lap Joint | A flange that requires a loose backing flange; allows for easy alignment and rotation but cannot be used for high-pressure applications. |
ANSI Weld Neck Flange Dimensions (Class 150)
NPS (Inches) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Size (Diameter) | Flange Thickness |
1 | 4.88 | 3.50 | 4 | 5/8 | 0.38 |
2 | 6.00 | 4.75 | 4 | 5/8 | 0.38 |
3 | 7.50 | 5.75 | 4 | 5/8 | 0.38 |
4 | 9.00 | 6.75 | 8 | 5/8 | 0.38 |
6 | 11.00 | 8.63 | 8 | 3/4 | 0.50 |
8 | 13.00 | 10.50 | 8 | 3/4 | 0.50 |
10 | 15.00 | 12.75 | 12 | 3/4 | 0.62 |
12 | 16.75 | 14.75 | 12 | 3/4 | 0.62 |
14 | 19.00 | 16.50 | 12 | 7/8 | 0.62 |
16 | 21.50 | 18.50 | 12 | 7/8 | 0.75 |
ANSI Slip-On Flange Dimensions (Class 150)
NPS (Inches) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Size (Diameter) | Flange Thickness |
1 | 4.88 | 3.50 | 4 | 5/8 | 0.38 |
2 | 6.00 | 4.75 | 4 | 5/8 | 0.38 |
3 | 7.50 | 5.75 | 4 | 5/8 | 0.38 |
4 | 9.00 | 6.75 | 8 | 5/8 | 0.38 |
6 | 11.00 | 8.63 | 8 | 3/4 | 0.50 |
8 | 13.00 | 10.50 | 8 | 3/4 | 0.50 |
10 | 15.00 | 12.75 | 12 | 3/4 | 0.62 |
12 | 16.75 | 14.75 | 12 | 3/4 | 0.62 |
14 | 19.00 | 16.50 | 12 | 7/8 | 0.62 |
16 | 21.50 | 18.50 | 12 | 7/8 | 0.75 |
ANSI Blind Flange Dimensions (Class 150)
NPS (Inches) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Size (Diameter) | Flange Thickness |
1 | 4.50 | 3.50 | 4 | 5/8 | 0.38 |
2 | 6.00 | 4.75 | 4 | 5/8 | 0.38 |
3 | 7.50 | 5.75 | 4 | 5/8 | 0.38 |
4 | 9.00 | 6.75 | 8 | 5/8 | 0.38 |
6 | 11.00 | 8.63 | 8 | 3/4 | 0.50 |
8 | 13.00 | 10.50 | 8 | 3/4 | 0.50 |
10 | 15.00 | 12.75 | 12 | 3/4 | 0.62 |
12 | 16.75 | 14.75 | 12 | 3/4 | 0.62 |
14 | 19.00 | 16.50 | 12 | 7/8 | 0.62 |
16 | 21.50 | 18.50 | 12 | 7/8 | 0.75 |
ANSI Socket Weld Flange Dimensions (Class 150)
NPS (Inches) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Size (Diameter) | Flange Thickness |
1 | 4.50 | 3.50 | 4 | 5/8 | 0.38 |
2 | 6.00 | 4.75 | 4 | 5/8 | 0.38 |
3 | 7.50 | 5.75 | 4 | 5/8 | 0.38 |
4 | 9.00 | 6.75 | 8 | 5/8 | 0.38 |
6 | 11.00 | 8.63 | 8 | 3/4 | 0.50 |
8 | 13.00 | 10.50 | 8 | 3/4 | 0.50 |
10 | 15.00 | 12.75 | 12 | 3/4 | 0.62 |
12 | 16.75 | 14.75 | 12 | 3/4 | 0.62 |
14 | 19.00 | 16.50 | 12 | 7/8 | 0.62 |
16 | 21.50 | 18.50 | 12 | 7/8 | 0.75 |
ANSI Threaded Flange Dimensions (Class 150)
NPS (Inches) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Size (Diameter) | Flange Thickness |
1 | 4.50 | 3.50 | 4 | 5/8 | 0.38 |
2 | 6.00 | 4.75 | 4 | 5/8 | 0.38 |
3 | 7.50 | 5.75 | 4 | 5/8 | 0.38 |
4 | 9.00 | 6.75 | 8 | 5/8 | 0.38 |
6 | 11.00 | 8.63 | 8 | 3/4 | 0.50 |
8 | 13.00 | 10.50 | 8 | 3/4 | 0.50 |
10 | 15.00 | 12.75 | 12 | 3/4 | 0.62 |
12 | 16.75 | 14.75 | 12 | 3/4 | 0.62 |
14 | 19.00 | 16.50 | 12 | 7/8 | 0.62 |
16 | 21.50 | 18.50 | 12 | 7/8 | 0.75 |
ANSI Lap Joint Flange Dimensions (Class 150)
NPS (Inches) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Size (Diameter) | Flange Thickness |
1 | 4.50 | 3.50 | 4 | 5/8 | 0.38 |
2 | 6.00 | 4.75 | 4 | 5/8 | 0.38 |
3 | 7.50 | 5.75 | 4 | 5/8 | 0.38 |
4 | 9.00 | 6.75 | 8 | 5/8 | 0.38 |
6 | 11.00 | 8.63 | 8 | 3/4 | 0.50 |
8 | 13.00 | 10.50 | 8 | 3/4 | 0.50 |
10 | 15.00 | 12.75 | 12 | 3/4 | 0.62 |
12 | 16.75 | 14.75 | 12 | 3/4 | 0.62 |
14 | 19.00 | 16.50 | 12 | 7/8 | 0.62 |
16 | 21.50 | 18.50 | 12 | 7/8 | 0.75 |
Understanding ANSI flange dimensions is important for engineers and technicians involved in the design and installation of pipelines. Accurate ANSI flange dimensions, as well as pressure ratings and specifications, ensure consistency and reliable performance in a variety of industrial applications. This chart, provided by Elite Piping Manufacture Co., Ltd., provides information on common ANSI flange dimensions and specifications, which help in the proper selection and use of flanges for piping. Adherence to these ANSI standards helps the industry maintain safe and efficient fluid flow, reducing the risk of corrosion and system failure.
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