Pipe flanges are vital components in piping systems, 파이프 사이의 커넥터 역할, 밸브, 슬리퍼, 그리고 다른 장비. 그들은 제공합니다 힘, flexibility, and ease of maintenance in industries such as oil and gas, 화학 처리, 발전, 수처리, 조선업. Choosing the right flange is essential to ensure 안전, 신뢰할 수 있음, 그리고 비용 효율성 of the system.

이 기사에서는 설명합니다. what to look for in pipe flanges, focusing on key considerations such as materials, 압력 등급, 직면 유형, 표준, and applications. By understanding these aspects, engineers and procurement professionals can make informed decisions when selecting flanges.

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What Are Pipe Flanges?

A pipe flange is a forged or cast ring that allows the connection of pipes, 피팅, 밸브, and other components. Flanges are joined by bolting and sealing with a gasket, creating a leak-proof joint that can be dismantled when necessary.

Common Types of Pipe Flanges:

• 용접 목 플랜지 – Strong and suitable for high-pressure systems

• 슬립온 플랜지 – Easy to install, used in low-to-medium pressure pipelines

• 소켓 용접 플랜지 – Ideal for small-diameter, high-pressure systems

• 스레드 플랜지 – Used where welding is not possible

• 랩 조인트 플랜지 – Allows easy alignment, often used with stub ends

• 블라인드 플랜지 – Used to close or seal off a pipeline

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Key Factors to Look For in Pipe Flanges

1. 재료 선택

Material choice directly affects performance, 내식성, 그리고 내구성.

• 탄소강 – Economical, 고강도, used in general industry

• 스테인레스 스틸 – Excellent resistance to corrosion and oxidation

• 합금강 – Withstands high temperatures and pressures

• 니켈 합금 – Superior resistance to aggressive chemicals

• 듀플렉스 및 슈퍼듀플렉스 스테인리스 스틸 – Outstanding strength and chloride corrosion resistance

Tip: Always ensure flange material matches the pipe material to avoid galvanic corrosion.

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2. 압력 등급

Flanges are classified into 압력 등급, indicating the maximum pressure they can withstand at a specific temperature.

• Classes: 150, 300, 600, 900, 1500, 그리고 2500 (per ANSI/ASME B16.5)

• Higher class = higher pressure and temperature capability

예:

• 수업 150: Used for low-pressure water pipelines

• 수업 600 이상: Required in refineries and power plants

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3. Flange Facing Types

The flange facing ensures proper gasket seating and leak-proof connections.

• 제기된 얼굴 (RF): 가장 일반적인, good for general-purpose sealing

• 편평한 얼굴 (FF): Used in low-pressure systems or with cast iron equipment

• 링형 조인트 (RTJ): Designed for high-pressure, high-temperature conditions

• Male and Female / 혀와 그루브: Prevents gasket displacement and ensures precise alignment

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4. 개스킷 호환성

The gasket material must match the flange facing and operating environment.

• Soft Gaskets (고무, PTFE): 저압 응용 분야에 적합

• Spiral Wound Gaskets: Widely used in high-pressure and high-temperature systems

• Ring Joint Gaskets: Specifically for RTJ facings in extreme conditions

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5. 표준 및 규정 준수

Pipe flanges must comply with international standards to ensure safety and interchangeability.

• ASME/ANSI B16.5: Pipe flanges up to 24 신장

• ASME B16.47: 대구경 플랜지

• DIN/EN Standards: Widely used in Europe

• JIS Standards: Common in Japan and Asia

Tip: Always confirm client or project requirements before procurement.

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6. Dimensions and Tolerances

• 확인하다 outer diameter (의), inner diameter (ID), 볼트 원 직경 (BCD), 및 두께.

• Ensure tolerances meet project design codes to prevent misalignment.

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7. Bolt and Torque Requirements

Bolts must be selected based on:

• 재료: Corrosion resistance and strength

• Torque Application: Correct torque prevents both under-tightening (누출) and over-tightening (gasket damage).

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8. 부식 저항

Pipelines exposed to seawater, 산, or chemicals require flanges with high corrosion resistance.

• Stainless steel and duplex grades are preferred in marine and chemical plants.

• Coatings and linings can be used for carbon steel flanges in corrosive service.

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9. Installation and Maintenance

• Inspect flanges before installation for cracks or warping

• Ensure proper alignment during installation

• Use torque sequences for bolts to ensure even pressure distribution

• Schedule regular maintenance checks to prevent leakage and downtime

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Applications of Pipe Flanges

1. 석유 및 가스 산업

   • Pipelines, 정유소, 해양 플랫폼

   • High-pressure weld neck and RTJ flanges

2. Chemical and Petrochemical

   • 원자로, 저장 탱크, chemical pipelines

   • Stainless steel and alloy flanges for corrosion resistance

3. 발전

   • Boilers, 증기선, nuclear plants

   • 고압, 고온 플랜지

4. 해양공학

   • 안정기 시스템, desalination plants

   • Duplex stainless steel flanges

5. 수처리

   • Distribution pipelines, wastewater systems

   • Large-diameter slip-on and lap joint flanges

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Pipe Flanges vs. Other Connection Methods