As an important part of piping system, flanges play a vital role in connecting pipes, valves, pumps and other equipment. The products are used in oil and gas, chemical or water treatment plants and these places.
Flanges are flanges or ridges used to connect pipes, fittings or machinery. Flanges are bolted or welded to form a strong connection for easy assembly, disassembly and inspection. Flanges come in a variety of shapes and sizes to withstand different pressures, temperatures and environmental conditions. By standardizing connections, flanges promote interoperability between systems, thereby reducing downtime and maintenance costs.
Size: refers to the nominal pipe size (NPS) or diameter, which must be matched to the connected components.
Pressure Rating: indicates the maximum pressure that the flange can withstand, usually classified according to standards such as ANSI/ASME (e.g. Class 150, Class 300, Class 600).
Materials: Commonly used materials include carbon steel, stainless steel, alloy steel, and non-ferrous metals such as brass or copper, which are selected for their corrosion resistance and strength.
Face types: These include flat faces (FF), raised faces (RF) and ring joints (RTJ), which affect sealing efficiency.
Bolt hole layout: the number and diameter of bolt holes, which are critical for alignment and tightening.
Standards: Compliance with international standards such as ANSI, ASME, DIN or JIS ensures compatibility and safety.
| Parameter | Description | Common Values |
|---|---|---|
| Nominal Size | Diameter of the pipe connection | 1/2" to 24" (or larger) |
| Pressure Class | Maximum pressure rating | Class 150, 300, 600, 900, 1500, 2500 |
| Material Grade | Type of material used | A105 (Carbon Steel), SS304 (Stainless Steel), Alloy 20 |
| Face Type | Surface design for gasket sealing | Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ) |
| Bolt Circle Diameter | Diameter of the bolt hole circle | Varies by size and class (e.g., 3.5" for 2" Class 150) |
| Standards | Governing specifications | ANSI/ASME B16.5, DIN 2527, JIS B2220 |
Flanges are categorized based on their design and application. Here are the most common types:
