Flanges Dimensions | Best Quality SS Tube, Pipe, Valve, Ferrule Fittings Supplier in India
Flange dimensions are critical in industries like plumbing, construction, and mechanical engineering, as they determine how flanges will fit together and perform under pressure. Flanges are used to connect pipes, valves, pumps, and other equipment, and ensuring they are correctly sized is essential for safety and performance.
Here’s an outline of common flange dimensions that might appear on a technical website related to flanges:
Flange Dimensions Overview
Flanges come in various standard sizes, types, and materials, depending on their application. These dimensions are defined by standards such as ANSI (American National Standards Institute), ASME (American Society of Mechanical Engineers), DIN (German Industrial Standards), and others. The key dimensions typically include:
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Nominal Pipe Size (NPS): Refers to the pipe size to which the flange is attached. It is typically a whole number.
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Face Types: Flanges have different face designs, including:
- Flat Face (FF): Flange face is flat and does not have any raised area.
- Raised Face (RF): Has a raised area around the bore.
- Ring Type Joint (RTJ): Designed to accommodate a metal ring for a high-pressure seal.
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Bolt Circle Diameter (BCD): The diameter of the circle that passes through the center of the bolt holes on the flange.
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Bolt Hole Size: The size of the holes used for bolts, typically based on the NPS and flange class.
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Number of Bolt Holes: The number of holes in the flange, which typically increases with the size of the flange.
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Thickness of Flange: The measurement of the flange’s thickness, which varies depending on the pressure class and material.
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Outside Diameter (OD): The overall diameter of the flange, which typically increases as the pipe size increases.
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Inner Diameter (ID): The hole in the middle of the flange that connects with the pipe.
Common Flange Standards
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ASME B16.5 (ANSI Flanges): Covers flanges from 1/2” to 24” in size for pressure classes 150, 300, 600, 900, 1500, and 2500.
- Example Dimensions for a 150lb Raised Face Flange:
- NPS 1/2” - 24”
- Bolt Circle Diameter: Varies by size
- Number of Bolt Holes: 4 to 12 depending on size
- Thickness: Varies by size and pressure class
- Example Dimensions for a 150lb Raised Face Flange:
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DIN 2576 / 2573: Common in Europe for flanges up to DN 1200.
- Example Dimensions for a PN 10 Flange (Nominal Pressure):
- DN 25 to DN 600
- Bolt Circle Diameter: Varies by size
- Number of Bolt Holes: Typically 4 to 12
- Example Dimensions for a PN 10 Flange (Nominal Pressure):
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API Flanges: Used for the oil and gas industry, with larger sizes and higher pressure ratings.
- Dimensions vary significantly based on the standard (e.g., API 6A, API 5L).
Flange Dimension Chart (Example)
| Flange Type | NPS Size | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolt Holes | Bolt Hole Size | Flange Thickness |
|---|---|---|---|---|---|---|
| Raised Face | 1” | 4.5” | 3.5” | 4 | 0.5” | 0.75” |
| Raised Face | 4” | 9.0” | 7.5” | 8 | 0.75” | 1.25” |
| Flat Face | 6” | 12.0” | 9.0” | 8 | 1.0” | 1.5” |
| Raised Face | 12” | 18.0” | 14.0” | 12 | 1.5” | 2.0” |
Flange Materials
Flanges are manufactured in various materials, including:
- Carbon Steel (common in most applications)
- Stainless Steel (for high corrosion resistance)
- Alloy Steel (for high-temperature and high-pressure conditions)
- Cast Iron (used in low-pressure applications)
- Brass, Bronze, and Plastic (for specialized applications)
Pressure Classifications
Flanges are also classified by pressure rating, which determines their suitability for different operational pressures:
- Class 150
- Class 300
- Class 600
- Class 900
- Class 1500
- Class 2500
