Differences in ANSI Flanges Across Different Pressure Ratings

Ansi Flanges: Design Variations Across Pressure Ratings

ANSI Flange is a component used to connect pipelines, valves, equipment, etc., secured via bolted joints to ensure system sealing and structural integrity. Flange design and application must comply with specific standards and codes to guarantee safety and reliability under varying operating conditions. For flanges of the same nominal diameter, design and construction differ across pressure ratings, primarily manifested in the following aspects:

1. Flange Thickness: As pressure ratings increase, Ansi Flange Standard thickness typically increases to provide greater strength and pressure resistance.
2. Bolt Hole Spacing: Bolt hole spacing may vary between pressure ratings to accommodate different fastening requirements and ensure uniform load distribution.
3. Sealing Surface Width: The width of the sealing surface may differ to maintain effective sealing performance under varying pressure conditions.
4. Flange Outer Diameter (OD): Despite identical nominal diameters, flanges across pressure ratings may have different outer diameters to meet structural and fastening needs.

Recommendations for Selecting Appropriate Pressure-Rated Flanges
When choosing flanges, select models compatible with the actual operating environment, pressure requirements, and pipe dimensions, adhering to relevant standards for design and installation. For example, lower-pressure applications may use cost-effective low-pressure flanges, while high-pressure systems require corresponding high-pressure flanges to ensure safety.

Conclusion
In summary, Ansi Standard Flanges exhibit distinct design and construction differences across pressure ratings to ensure performance and safety under varied operating conditions. Selection must prioritize practical application scenarios and relevant standards to guarantee stable pipeline system operation.