플랜지는 배관 시스템의 필수 구성 요소입니다., enabling secure connections between pipes, 밸브, 슬리퍼, 그리고 다른 장비. Among the different international standards, ANSI flanges are widely used in industries such as oil and gas, 화학 처리, 발전, 수처리, 조선업. ANSI stands for the American National Standards Institute, which establishes dimensional and pressure standards for flanges to ensure safety, 호환성, 및 호환성.

When selecting or designing systems with ANSI flanges, engineers and procurement professionals must take into account several key considerations. These factors determine not only the performance and safety of the system but also its long-term reliability and cost-effectiveness.

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What Are ANSI Flanges?

ANSI flanges are piping connection components designed and manufactured according to standards set by the American National Standards Institute. The most widely referenced specification is 안시/ASME B16.5, which covers pipe flanges and flanged fittings ranging from ½ inch to 24 inches in nominal size and from Class 150 수업에 2500 in pressure ratings.

Common Types of ANSI Flanges:

• 용접 목 플랜지 – Ideal for high-pressure and high-temperature systems

• 슬립온 플랜지 – Easy to install, suitable for low-to-medium pressure

• 소켓 용접 플랜지 – Used in small-diameter, 고압 배관

• 스레드 플랜지 – Requires no welding, suitable for low-pressure applications

• 블라인드 플랜지 – Used to seal off the end of a pipe or nozzle

• 랩 조인트 플랜지 – Paired with a stub end for easy alignment and dismantling

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ANSI 플랜지의 주요 고려 사항

1. 재료 선택

The choice of material affects both performance and durability. ANSI flanges can be manufactured from:

• 탄소강 – Cost-effective, 강한, but limited corrosion resistance

• 스테인레스 스틸 – Excellent corrosion resistance, widely used in chemical and marine environments

• 합금강 – Suitable for high-temperature and high-pressure conditions

• 니켈 합금 – Best for aggressive chemical processing applications

Tip: Always match flange material with the piping material to avoid galvanic corrosion.

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2. 압력 등급

ANSI flanges are classified into different 압력 등급, 포함 150, 300, 600, 900, 1500, 그리고 2500. These ratings indicate the maximum pressure the flange can withstand at a given temperature.

• 수업 150 – Suitable for low-pressure water pipelines

• 수업 600 – Common in oil and gas pipelines

• 수업 2500 – Used in very high-pressure environments such as refineries and power plants

Tip: Always consider both 압력과 온도 simultaneously, as pressure capacity decreases at higher temperatures.

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3. 직면 유형

The facing of a flange ensures a proper seal between mating surfaces. ANSI flanges have several facing options:

• 제기된 얼굴 (RF): 가장 일반적인, provides good sealing performance

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

• 링형 조인트 (RTJ): Ideal for high-pressure and high-temperature environments

• 혀와 그루브 / Male and Female: Prevent gasket displacement and ensure precise alignment

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4. 개스킷 호환성

The gasket is critical for leak prevention. Selecting the wrong gasket can lead to system failure.

• Non-metallic gaskets (고무, PTFE) – For low-pressure systems

• 금속 개스킷 (spiral wound, ring joint) – For high-pressure, 고온 애플리케이션

Tip: Ensure the gasket material is chemically compatible with the process fluid.

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5. Bolt Selection and Torque

Bolts hold flanges together, and correct torque application is crucial to prevent leakage.

• Use high-quality, corrosion-resistant bolts.

• Follow torque tightening sequences (typically crisscross patterns).

• Avoid over-tightening, which may damage gaskets.

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6. Standards Compliance

ANSI flanges must comply with:

• ASME B16.5 – Pipe flanges and fittings up to 24 신장

• ASME B16.47 – Large diameter steel flanges

• ASME B31.3 – Process piping design codes

Ensuring compliance guarantees 호환성, 안전, and quality assurance across projects.

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7. Installation and Maintenance

Proper installation ensures long-term performance.

• Inspect flanges for cracks, 뒤틀림, or corrosion before use

• Ensure correct alignment of flanges to avoid undue stress

• Use appropriate lubricants for bolts

• Regularly inspect joints during maintenance cycles

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Advantages of ANSI Flanges

1. Global Standardization – Ensures compatibility across industries worldwide

2. 폭넓은 가용성 – Standardized sizes and materials are readily available

3. 유연성 – Multiple types for various applications

4. 내구성 – Designed to withstand high pressure and temperature conditions

5. 안전 – Compliance with ANSI standards ensures reliable performance

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Applications of ANSI Flanges

석유 및 가스

• Pipelines, 해양 플랫폼, 정유소

• 고압 및 고온 연결

화학 처리

• 원자로, distillation units, 저장 탱크

• Resistant stainless steel and alloy flanges are preferred

발전

• 스팀 라인, cooling water systems, nuclear plants

• High-strength flanges in Class 600–2500

해양 및 조선

• 안정기 시스템, desalination plants, 냉각 시스템

• Corrosion-resistant stainless steel flanges

Water Treatment and Infrastructure

• Pipelines for water distribution and wastewater management

• Large diameter flanges ensure efficient flow

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ANSI Flanges vs. Other Standards