23 6月 20250 コメント

フランジ圧力定格とは: 完全なガイド?

フランジは、配管システムに不可欠なコンポーネントです, 接続パイプ, バルブ, パンプス, およびその他の機器. しかし, すべてのフランジが同じように作られているわけではありません. One of the most important factors to consider when selecting a flange is its 圧力定格. This rating determines the maximum pressure the flange can handle under specific temperature conditions. この記事では, we will explain what flange pressure ratings are, 彼らはどのように働くのか, and why they matter in industrial applications.

As a professional flange supplier, ササフランジ offers a wide range of pressure-rated flanges to meet the demands of different industries and applications. Understanding these ratings can help you select the right flange for your project and ensure safety, 耐久性, とコンプライアンス.

フランジ圧力定格とは?

Flange pressure ratings, としても知られています 圧力クラス, indicate the amount of internal pressure a flange can safely withstand at a given temperature. These ratings are defined by international standards such as:

  • ASME B16.5 (used in the US and internationally)

  • EN 1092-1 (European standard)

  • DIN (German standards)

Common pressure ratings in ASME B16.5 含む:

  • クラス 150

  • クラス 300

  • クラス 600

  • クラス 900

  • クラス 1500

  • クラス 2500

Each class refers to a range of pressure capacities, not a fixed number of pounds per square inch (psi).

Pressure Rating vs Actual Pressure

It is important to note that a Class 150 flange does ない mean it can handle exactly 150 psi. The pressure capacity varies depending on:

  • フランジ 材料

  • 動作温度

  • 腐食代

  • パイプスケジュール

例えば, クラス 150 stainless steel flange may handle 285 psi（100°F）, but its capacity decreases as the temperature increases.

Temperature Effects on Pressure Ratings

Flange pressure ratings are temperature-dependent. The higher the temperature, the lower the pressure rating. This is due to the weakening of the flange material at elevated temperatures.

例えば:

  • クラス 300 flange in carbon steel may handle:

    • 570 psi（100°F）

    • 260 psi at 600°F

Different materials (ステンレス鋼や合金鋼のような) will have different reductions in capacity.

ササフランジ provides material-specific pressure rating tables to help customers select the right flange under their expected temperature range.

Flange Rating Conversion: ASME vs EN

If you work with global suppliers, you may encounter different rating systems:

ASMEクラス EN PN Equivalent
クラス 150 PN 20 or PN 25
クラス 300 PN 40
クラス 600 PN 64 or PN 63
クラス 900 PN 100
クラス 1500 PN 160
クラス 2500 PN 250 or PN 400

Factors That Affect Flange Pressure Ratings

  1. 材質の種類

    • 炭素鋼, ステンレス鋼, 合金鋼, and ductile iron all have different ratings.

  2. フランジタイプ

    • ウェルドネック, スリッポン, 盲目, ねじ切りされた, and lap joint flanges may vary in strength.

  3. Wall Thickness

    • Thicker flanges and connected pipes can typically withstand higher pressures.

  4. Gasket and Bolt Quality

    • The full assembly must support the pressure, not just the flange.

  5. Design Code

    • ASME, EN, and other standards calculate pressure differently.

How to Select the Correct Flange Pressure Rating

To choose the correct flange rating for your system:

  1. Determine the 最大使用圧力 そして 温度.

  2. Identify the 材料 建設の.

  3. 使用 ASME B16.5 またはEN 1092 tables to match a pressure class.

  4. Consider corrosion allowances and gasket factors.

  5. Always factor in safety margins.

不明な場合は, consult an experienced flange manufacturer like ササフランジ to verify your selection.

Common Industries Using High-Pressure Flanges

  • 石油とガス

  • 石油化学

  • 発電

  • 海兵隊

  • 化学処理

  • 水処理

High-pressure systems demand flanges that are not only strong but also reliable over time.

ササフランジ specializes in supplying pressure-rated flanges tailored for demanding environments.

最終的な考え

Understanding flange pressure ratings is critical for ensuring the safety and performance of your piping systems. These ratings are not just numbers; they are based on science, engineering, and decades of standards development. Whether you are designing a new system or replacing old components, always check the pressure class, 温度範囲, 材料の互換性.

When quality and safety matter, ササフランジ is your trusted partner for high-performance flanges and pipe fittings. Reach out to our team to get technical support, datasheets, およびカスタムソリューション.

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