Flanges são componentes críticos em sistemas de tubulação, usado para conectar tubos, válvulas, bombas, e outros equipamentos com segurança. Eles permitem fácil montagem, desmontagem, e manutenção de dutos. Entre os muitos tipos de flanges, rosto levantado (RF) flanges e cara plana (FF) flanges are two of the most commonly used. Although both serve the same general purpose, their designs, aplicações, and performance differ significantly. This article explores the differences between raised face and flat face flanges, suas vantagens, aplicações, and selection considerations.

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O que é um flange de face elevada?

A raised face flange is characterized by a small raised section around the bore where the gasket is placed. This raised portion concentrates the pressure on a smaller gasket area, which improves the sealing capability.

Principais recursos:

• Projeto: A raised area, tipicamente 1.6 mm para classe 150 e 300 flanges, e 6.4 mm for higher classes.

• Uso de junta: Compatível com uma ampla variedade de juntas, incluindo enrolamento em espiral e juntas de metal.

• Aplicativos: Used in high-pressure and high-temperature environments where strong sealing is essential.

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O que é um flange de face plana?

A flat face flange has a completely flat surface across the sealing area, with no raised portion. The gasket covers the entire flange face, and the pressure is distributed evenly across the surface.

Principais recursos:

• Projeto: Todo o rosto é plano, with bolt holes around the circumference.

• Uso de junta: Typically uses full-face gaskets that match the flange surface.

• Aplicativos: Comum em baixa pressão, low-temperature systems, especially when brittle materials like cast iron are involved.

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Face elevada vs flange de face plana: Principais diferenças

1. Projeto

• Rosto levantado: Has a protruding section around the bore.

• Rosto plano: Entire flange face is flat.

2. Sealing Efficiency

• Rosto levantado: Concentrates pressure on the gasket, improving seal reliability.

• Rosto plano: Distributes pressure evenly across the gasket surface.

3. Classificações de pressão

• Rosto levantado: Suitable for higher pressure classes (150–2500).

• Rosto plano: Typically used in lower pressure ratings (Aula 125 ou 250).

4. Aplicativos

• Rosto levantado: Used in oil & gás, petroquímico, and power industries where pressure is high.

• Rosto plano: Used in waterworks, conexões da bomba, and systems using cast iron.

5. Custo

• Rosto levantado: Slightly more expensive due to design and compatibility with high-performance gaskets.

• Rosto plano: More economical, suited for simpler applications.

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Applications of Raised Face Flanges

• Oleodutos e Gasodutos: High-pressure and high-temperature conditions.

• Plantas Petroquímicas: Where reliable sealing is critical.

• Usinas Elétricas: Linhas de vapor, trocadores de calor, and boilers.

• Industrial Equipment: Bombas, válvulas, and compressors.

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Applications of Flat Face Flanges

• Waterworks: Common in pipelines for potable water or wastewater.

• Sistemas HVAC: Low-pressure heating and cooling systems.

• Cast Iron Equipment: Prevents uneven stress on brittle cast iron.

• General Piping Systems: Baixa pressão, low-temperature applications.

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Vantagens dos flanges de face elevada

1. Provides excellent sealing in high-pressure environments.

2. Compatível com uma ampla variedade de juntas.

3. Widely accepted and standardized across industries.

4. Ensures safety and reliability in critical applications.

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Vantagens dos flanges de face plana

1. Prevents overstressing brittle materials like cast iron.

2. More economical for low-pressure systems.

3. Uses simple full-face gaskets for easy installation.

4. Provides uniform gasket compression.

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Tabela Comparativa