ASME Flange
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ASME Flange B16.5-1996 and B16.47-1996
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed. Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.
| ASME/ANSI B16.5-1996 and B16.47-1996 | |||
| Tolerances on flange dimensions (ASME/ANSI B16.5 and B16.7, and MSS SP-44) | |||
| Dimension | Range | Tolerance | |
| in | mm | ||
| General and Blind Flanges(For blind flange dimendions see page 8-23 for B16.5, page8-46 for B16.47 Series A/ MSS SP-44 and page 8-51 for B16.47 Series B/ API 605): | |||
| G(raised face diameter) | ≤NPS 24 | ±0.03 | ±0.76 |
| ≥NPS 26,with 0.06 in raised face | ±0.08 | ±2.03 | |
| ≥NPS 26,with 0.25 in raised face | ±0.04 | ±1.02 | |
| I(bolt hole diameter) | All | No tolerance in B16.5 or B 16.47 | |
| J(bolt circle diameter) | All | ±0.06 | ±1.52 |
| Center to center of adjacent bolt holes | All | ±0.03 | ±0.76 |
| Eccenticity of bolt circle and machined facing diameters | ≤NPS 2½ | ±0.03 | ±0.76 |
| ≥NPS 3 | ±0.06 | ±1.52 | |
| Weld Neck Flanges1 (For dimensions see page 8-10 for B 16.5, page 8-46 for B16.47 Series A/ MSS SP-44 and page 8-51 for B16.47 Series B/ API 605): | |||
| D(overall length) | ≤NPS 4 | ﹢0.06 | ﹢1.52 |
| NPS 5 to 10 | ﹢0.06,﹣0.12 | ﹢1.52,﹣3.05 | |
| NPS 12 to 24 | ﹢0.12,﹣0.18 | ﹢3.05,﹣4.57 | |
| ≥NPS 26 | ±0.19 | ±4.83 | |
| Thickness of hub | All | ＞87.5% of pipe nominal wall thickness | |
| Slip on(see page 8-17),Lap Joint(see page8-32) and Socket Welding(see page 8-30 for dimensions) Flanges: | |||
| B(inside diameter,or bore) | ≤NPS10 | ﹢0.03,﹣0.0 | ﹢0.76,﹣0.0 |
| ≥NPS12 | ﹢0.06,﹣0.0 | ﹢1.52,﹣0.0 | |
| Threaded Flanges (see page 8-40 for dimensions): | |||
| B(counterbore) (Not applicable for Class 150 lb | ≤NPS10 | ﹢0.03,﹣0.0 | ﹢0.76,﹣0.0 |
| ≥NPS12 | ﹢0.06,﹣0.0 | ﹢1.52,﹣0.0 | |
Learn More About Kaysuns
Kaysuns supplies ASME flanges manufactured from stainless steel, alloy steel, carbon steel, and other materials. If you have specific material requirements, please don’t hesitate to contact us.
How to Select A ASME Flange
The selection of ASME flanges primarily depends on the application scenario,pipe size,pressure rating,operating temperature,material,flange type and flange face.They must comply with ASME B16.5 (small bore) or B16.47 (large bore) standards to ensure proper pressure and size matching,while also considering the corrosiveness of the medium and sealing requirements.
Standards,Dimensions And NPS
- ASME B16.5:Applies to flanges from 1/2“ to 24”.
- ASME B16.47:Applies to large flanges of 26″ and above,divided into Series A and Series B.
- Matches the NPS of the connected pipe.
Working temperature
The flange must be capable of withstanding the maximum operating temperature of the system medium, with the pressure rating corresponding to the temperature.
Flange Type
- Weld Neck Flange (WN):Preferred for high-pressure and high-temperature applications, providing a secure connection.
- Socket Weld Flange (SO):Suitable for medium and low-pressure applications, offering easy installation.
- Blind Flange (BL): Used to seal off the end of a pipeline.
- Threaded Flange (TH), Socket Weld Flange (SW), Lap Joint Flange (LAP), etc.
Flange sealing face
- Raised Face (RF): Most common,used for medium and high pressure.
- Flat Face (FF): Used for low pressure and non-metallic piping.
- Mismatched Face (MFM), Ring Type Joint (RTJ),etc.,require matching with gaskets.
Pressure Class
Determined based on the system’s maximum working pressure, such as Class 150, 300, 600, 900, etc.
Material
It must be compatible with the conveyed medium and the working environment, such as carbon steel, stainless steel, or alloy steel. Find the most suitable one.
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- RM901 No.22 Tangjiaqiao Road Wenzhou China
- +86 577 8551 1171
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- https://www.kaysuns.com/
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