15 Август 20250 Комментарий

Все, что вам нужно знать о резьбовых фланцах

Фланцы с резьбой — важный тип трубных фланцев, используемый в различных отраслях промышленности для соединения труб., клапаны, и другое оборудование без необходимости сварки. 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, материал, or operational constraints.

В этой статье, we will cover what threaded flanges are, их преимущества, приложения, материалы, номинальное давление, 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″ до НПС 24″.

  • Designed according to standards like ASME B16.5.

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

  • Easy to assemble and disassemble.

Преимущества резьбовых фланцев

1. Сварка не требуется

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

  • Prevents heat-related damage to pipe material.

2. Простота установки

  • Can be installed quickly with basic tools.

  • No need for specialized welding equipment or personnel.

3. Reusability

  • Can be removed and reused without damage, reducing replacement costs.

4. Minimal Heat Distortion

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

5. Универсальность

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

Limitations of Threaded Flanges

While threaded flanges offer many benefits, they have limitations:

  • Not ideal for high-pressure, высокотемпературный, 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. Hazardous Environments

    • 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, воздух, and non-hazardous fluid systems.

  5. Морской и оффшорный

    • Suitable for low-pressure seawater systems.

Threaded Flange Design Features

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

  • Поднятое лицо (РФ) or Flat Face (ФФ) – Common facing options.

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

  • Standard Pressure Ratings – Commonly Class 150 и класс 300.

Materials for Threaded Flanges

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

Тип материала Преимущества Общие приложения
Углеродистая сталь Экономичный, good strength General industrial
Нержавеющая сталь Коррозионная стойкость, гигиенический Еда, химический
Легированная сталь High strength and heat resistance High-temp service
Brass/Bronze Excellent for water and non-corrosive applications Морской, plumbing
Никелевые сплавы Excellent chemical resistance Химические заводы

Номинальные значения давления и температуры

Threaded flanges are typically used in lower pressure classes:

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

  • Сорт 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.

Рекомендации по установке

  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. Выравнивание

    • Properly align to prevent stress on threads.

  4. Крутящий момент

    • Avoid over-tightening to prevent cracking or distortion.

  5. Инспекция

    • Check threads for wear or damage before installation.

Threaded Flange vs. Other Flange Types

Особенность Резьбовой фланец Приварной фланец с горловиной Съемный фланец
Welding Required Нет Да Да
Номинальное давление Low to Medium От среднего до высокого Low to Medium
Установка Легкий, quick More complex Умеренный
Reusability Высокий Низкий Низкий

Standards for Threaded Flanges

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

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

  • JIS B2220 – Japanese standards for threaded flange dimensions.

Industries That Use Threaded Flanges

  • Масло & Газ (low-pressure lines, temporary connections)

  • Очистка воды

  • Пищевая промышленность

  • Системы отопления, вентиляции и кондиционирования

  • Морские применения

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 Сасафланж обеспечивает:

  • 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

  • Регулярный осмотр: Look for thread wear or damage.

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

  • Избегайте чрезмерного затягивания: Prevents cracking of the flange hub.

  • Clean Threads: Удалить грязь, масло, or old sealant before installation.

Заключение

Threaded flanges offer a convenient, экономически эффективный, 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, промышленный, и морской сектор.

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

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