15 Agosto 20250 Comentário

Tudo o que você precisa saber sobre flanges roscados

Os flanges roscados são um tipo importante de flange de tubo usado em várias indústrias para conectar tubos, válvulas, e outros equipamentos sem a necessidade de soldagem. Their design allows for a secure, leak-resistant joint by using internal threads that match the external threads of the pipe. This makes them especially valuable in systems where welding is impractical or undesirable due to safety, material, or operational constraints.

Neste artigo, we will cover what threaded flanges are, seus benefícios, aplicações, materiais, classificações de pressão, installation best practices, and how they compare with other flange types.

What is a Threaded Flange?

A threaded flange, also known as a screwed flange, is a type of flange with an internal thread. This thread matches the external thread of the connecting pipe, enabling the two components to be joined without welding.

Key characteristics:

  • Available in sizes typically from NPS 1/2″ para NPS 24″.

  • Designed according to standards like ASME B16.5.

  • Suitable for low-pressure and non-cyclic service conditions.

  • Fácil de montar e desmontar.

Vantagens dos flanges roscados

1. Não é necessária soldagem

  • Ideal for applications where welding is risky, such as explosive environments.

  • Prevents heat-related damage to pipe material.

2. Facilidade de instalação

  • Can be installed quickly with basic tools.

  • No need for specialized welding equipment or personnel.

3. Reutilização

  • Can be removed and reused without damage, reduzindo custos de substituição.

4. Minimal Heat Distortion

  • Since no welding is involved, there is no risk of heat-induced warping.

5. Versatilidade

  • Works well with galvanized, brass, or other materials sensitive to welding.

Limitations of Threaded Flanges

While threaded flanges offer many benefits, they have limitations:

  • Not ideal for high-pressure, alta temperatura, or cyclic load applications.

  • Threads may become worn or damaged over time.

  • More prone to leakage compared to welded connections if not properly installed.

Common Applications of Threaded Flanges

  1. Small-Diameter Piping Systems

    • Ideal for pipe sizes typically less than NPS 2.

  2. Ambientes Perigosos

    • Used where welding could create a fire or explosion risk.

  3. Temporary Installations

    • Easily removable for system changes or maintenance.

  4. Utility Piping

    • Often used in water, ar, and non-hazardous fluid systems.

  5. Marítimo e Offshore

    • Suitable for low-pressure seawater systems.

Threaded Flange Design Features

  • Bore with Internal Threads – Matches external threads of the pipe.

  • Rosto levantado (RF) ou face plana (FF) – Common facing options.

  • Bolt Holes on Flange Rim – For secure connection to mating flanges.

  • Standard Pressure Ratings – Commonly Class 150 e classe 300.

Materials for Threaded Flanges

Threaded flanges are available in a wide range of materials to meet specific application needs:

Tipo de material Vantagens Aplicativos comuns
Aço carbono Econômico, good strength General industrial
Aço inoxidável Resistência à corrosão, higiênico Comida, químico
Liga de aço High strength and heat resistance High-temp service
Brass/Bronze Excellent for water and non-corrosive applications Marinho, plumbing
Ligas de Níquel Excellent chemical resistance Plantas químicas

Classificações de pressão-temperatura

Threaded flanges are typically used in lower pressure classes:

  • Aula 150: General service, up to ~285 psi at 100°F.

  • Aula 300: Higher pressure capacity, up to ~740 psi at 100°F.

For high-pressure applications, other flange types like weld neck or socket weld are preferred.

Melhores práticas de instalação

  1. Thread Matching

    • Ensure pipe and flange threads are compatible (NPT or BSP standards).

  2. Thread Sealant

    • Use PTFE tape or pipe dope for leak prevention.

  3. Alinhamento

    • Properly align to prevent stress on threads.

  4. Torque

    • Avoid over-tightening to prevent cracking or distortion.

  5. Inspeção

    • Check threads for wear or damage before installation.

Threaded Flange vs. Other Flange Types

Recurso Flange Rosqueada Flange de pescoço soldado Flange deslizante
Welding Required Não Sim Sim
Classificação de pressão Baixo a Médio Médio a alto Baixo a Médio
Instalação Fácil, quick More complex Moderado
Reutilização Alto Baixo Baixo

Standards for Threaded Flanges

  • ASME B16.5 – Most common for sizes up to NPS 24.

  • Bobagem 4504 / EN 1092-1 – European standards for metric dimensions.

  • JIS B2220 – Japanese standards for threaded flange dimensions.

Industries That Use Threaded Flanges

  • Óleo & Gás (low-pressure lines, temporary connections)

  • Tratamento de Água

  • Processamento de Alimentos

  • Sistemas HVAC

  • Aplicações Marinhas

Why Quality Matters in Threaded Flanges

The performance of threaded flanges heavily depends on manufacturing precision and material quality. Working with a trusted supplier like sasa oblonga garante:

  • Dimensional accuracy for leak-free connections.

  • Compliance with ASME and international standards.

  • High-quality threading for long service life.

  • Availability in multiple materials and sizes.

Maintenance Tips for Threaded Flanges

  • Inspeção Regular: Look for thread wear or damage.

  • Proper Sealing: Always use thread sealants to avoid leakage.

  • Avoid Over-Torquing: Prevents cracking of the flange hub.

  • Clean Threads: Remove dirt, óleo, or old sealant before installation.

Conclusão

Threaded flanges offer a convenient, econômico, and welding-free solution for connecting piping systems, especially in low-pressure and hazardous environments. Their reusability, ease of installation, and compatibility with various materials make them an excellent choice for specific applications in construction, industrial, e setores marinhos.

By sourcing from a reputable supplier like sasa oblonga, you can ensure your threaded flanges meet the highest quality standards, providing reliable and long-lasting performance for your projects.

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