Extra-large flanges are typically manufactured through a segmented production process, where individual sections are produced separately and then assembled on-site. These flanges are generally defined as those exceeding the standard dimensions set by national regulations, with sizes above DN2000 commonly considered large. The manufacturing of such flanges is usually handled by the construction party or specialized fabricators.
There are several standard systems used for flange production, including:
1. **DIN Standard**
- Common pressure classes: PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250
- Flange sealing surfaces include raised face (DIN 2526C) and grooved surfaces (DIN 2512N)
2. **ANSI Standard**
- Common pressure classes: CL150, CL300, CL600, CL900, CL1500
- Flange sealing surface: ANSI B16.5 RF (Raised Face) flanges
3. **JIS Standard**
- Less commonly used in international projects
- Common pressure grades: 10K, 20K
The production process for extra-large flanges often involves forging and rolling techniques, using materials such as stainless steel, carbon steel, and alloy steel. Due to their size and complexity, these flanges are typically made in segments to facilitate transportation and on-site assembly. This approach ensures structural integrity while meeting project-specific requirements.
For more information on flange standards and manufacturing processes, visit [http://news.chinawj.com.cn](http://news.chinawj.com.cn).
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