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Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
In industrial production and fluid pipeline connections, flat face flanges and raised face flanges are two commonly used flange types.
A flat face flange has a sealing surface that is flush with the flange face. Sealing is achieved by compressing a gasket between the two flat surfaces using bolts. In contrast, a raised face flange features a slightly elevated, typically curved sealing surface. The gasket is compressed on this raised area, providing better sealing performance.
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Similarities Between Flat Face Flange and Raised Face Flange
Both flange types serve the same basic purpose: connecting pipes or equipment to ensure sealed fluid transmission. They are secured using bolts and gaskets and are often made from materials like carbon steel or stainless steel, chosen based on the application environment.
Differences Between Flat Face Flange and Raised Face Flange
Sealing Method
Flat face flanges use simple flat gaskets, while raised face flanges compress sealing rings or gaskets on the raised surface for improved sealing.
Tightening Force
Both require bolts, but raised face flanges need stronger tightening due to the design and sealing surface.
Manufacturing Cost
Raised face flanges typically cost more due to the precision required and the use of sealing rings. Flat face flanges are simpler and more economical to produce.
Application Scenarios
Flat face flanges are suitable for low-pressure systems where sealing demands are minimal. Raised face flanges are preferred in high-pressure or critical sealing environments such as oil and gas pipelines, pressure vessels, and chemical lines.
Installation and Maintenance
Flat face flanges are easier to install but demand high flatness and cleanliness. Raised face flanges offer better alignment but may require full disassembly for gasket replacement, leading to higher maintenance costs.
Conclusion
Flat face and raised face flanges are chosen based on different functional needs. When selecting a flange type, factors like sealing performance, pressure level, and cost should be considered. For best results, consult a professional or flange supplier to avoid unnecessary issues or losses.
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