特徴	シリーズA	シリーズB
デザイン	Heavier, 厚い	Lighter, thinner
Bolt Holes	Fewer, larger bolts	もっと, smaller bolts
強さ	Higher pressure and stress resistance	Moderate pressure handling
Space Requirement	Requires more installation space	More compact design
アプリケーション	油, ガス, 石油化学, オフショア	Waterworks, low-pressure piping
料金	More expensive due to size and strength	More economical

圧力の取り扱い

• シリーズA flanges are designed to handle higher pressures, making them suitable for critical oil and gas applications.

• シリーズB flanges handle lower pressures, but their lighter design makes them easier and cheaper to install.

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互換性

• シリーズA flanges are not interchangeable with Series B.

• シリーズB flanges are based on the older MSS SP-44 仕様, ensuring compatibility in many legacy systems.

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Material Considerations

Both Series A and Series B flanges can be manufactured from:

• 炭素鋼: For general industry use

• ステンレス鋼: For corrosion resistance in marine or chemical environments

• 合金鋼: For high-temperature and high-strength applications

ヒント: Always match flange material with pipe and gasket materials to ensure long-term performance.

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規格とコンプライアンス

• ASME B16.47 – Governs both Series A and Series B flanges

• ASME B16.5 – Governs flanges up to NPS 24

• API 6A and API 17D – Sometimes used for offshore and subsea oil and gas projects

Ensuring compliance with the right standard is critical to safety and operational success.

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Choosing Between Series A and Series B

選ぶ シリーズA if:

• You need maximum strength and reliability

• Operating in high-pressure oil, ガス, or petrochemical pipelines

• Space is not a major constraint

• Long-term safety is more important than upfront cost

選ぶ シリーズB if:

• You need a compact, lightweight flange

• Operating in low-to-medium pressure systems such as waterworks

• Working with existing MSS SP-44 piping systems

• Cost savings are a priority

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Advantages of Both Series

Series A Advantages:

• High-pressure resistance

• Fewer, stronger bolts reduce installation time

• 過酷な条件下でも長寿命

Series B Advantages:

• Cost-effective and easier to install

• Compact size saves space

• Compatible with legacy systems

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Maintenance Considerations

• Regular inspection for corrosion, ひび割れ, もしくはボルトの緩み

• Proper torque application during installation

• Use compatible gaskets for leak prevention

• Ensure material grade matches the operating environment

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結論

The main difference between ASME B16.47 Series A and Series B flanges lies in their design philosophy and application focus. Series A flanges are heavier, より強い, and designed for high-pressure environments such as oil and gas. Series B flanges are lighter, more economical, and widely used in waterworks and low-pressure piping systems.

For industries seeking high-quality large-diameter flanges, ササフランジ provides both Series A and Series B flanges manufactured to international standards. With strict quality control and a global supply network, ササフランジ ensures durable, 信頼性のある, and cost-effective flange solutions for critical industrial applications.

By understanding these differences, engineers and procurement teams can select the right flange type that balances 安全性, パフォーマンス, cost, and installation requirements.