15 8月 20250 コメント

ねじ付きフランジについて知っておくべきことすべて

ねじ付きフランジは、パイプを接続するためにさまざまな業界で使用される重要なタイプのパイプフランジです。, バルブ, 溶接を必要としないその他の機器. 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, 材料, or operational constraints.

この記事では, we will cover what threaded flanges are, 彼らの利点, アプリケーション, 材料, 圧力定格, インストールのベスト プラクティス, 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″ NPS24へ″.

  • Designed according to standards like ASME B16.5.

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

  • 組み立てと分解が簡単.

ねじ込みフランジの利点

1. 溶接は不要です

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

  • Prevents heat-related damage to pipe material.

2. 設置の容易さ

  • Can be installed quickly with basic tools.

  • No need for specialized welding equipment or personnel.

3. 再利用性

  • 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. 多用途性

  • 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, 高温, 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, 空気, and non-hazardous fluid systems.

  5. 海洋および海洋

    • Suitable for low-pressure seawater systems.

Threaded Flange Design Features

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

  • 盛り上がった顔 (RF) or Flat Face (FF) – Common facing options.

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

  • Standard Pressure Ratings – Commonly Class 150 とクラス 300.

Materials for Threaded Flanges

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

材質の種類 利点 一般的なアプリケーション
炭素鋼 費用対効果の高い, good strength General industrial
ステンレス鋼 耐食性, 衛生的な 食べ物, 化学薬品
合金鋼 High strength and heat resistance High-temp service
Brass/Bronze Excellent for water and non-corrosive applications 海兵隊, plumbing
ニッケル合金 Excellent chemical resistance 化学プラント

圧力と温度の定格

Threaded flanges are typically used in lower pressure classes:

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

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

高圧用途向け, other flange types like weld neck or socket weld are preferred.

インストールのベストプラクティス

  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. 位置合わせ

    • Properly align to prevent stress on threads.

  4. トルク

    • Avoid over-tightening to prevent cracking or distortion.

  5. 検査

    • Check threads for wear or damage before installation.

Threaded Flange vs. Other Flange Types

特徴 ねじ付きフランジ 溶接ネックフランジ スリップオンフランジ
Welding Required いいえ はい はい
圧力定格 Low to Medium 中～高 Low to Medium
インストール 簡単, quick より複雑な 適度
再利用性 高い 低い 低い

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

  • 油 & ガス (low-pressure lines, temporary connections)

  • 水処理

  • 食品加工

  • HVAC システム

  • 海洋用途

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 ササフランジ 保証します:

  • 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

  • 定期点検: 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, 油, or old sealant before installation.

結論

Threaded flanges offer a convenient, 費用対効果の高い, 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, 工業用, および海洋部門.

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

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