웰드 넥 플랜지는 산업용 배관 시스템에서 가장 널리 사용되는 플랜지 유형 중 하나입니다.. 내구성을 인정받았습니다, 힘, 고압 및 고온 조건을 처리하는 능력, they are a top choice in industries like oil and gas, 석유화학, 발전, 조선업.

This complete guide will cover everything you need to know about weld neck flanges, including their types, 치수, 재료, 장점, and common applications.

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What is a Weld Neck Flange?

웰드 넥 플랜지 (WN플랜지) is a type of flange with a long tapered hub and a smooth transition to the wall thickness of a pipe or fitting. It is designed to be butt-welded to the pipe, 강력한 생성, leak-proof connection that can withstand high stress. The tapered hub also reduces stress concentration at the base of the flange.

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Key Features of Weld Neck Flanges

• Butt-Weld Connection: Ensures strength and minimizes stress at the joint.

• Tapered Hub: Provides reinforcement and smooth stress distribution.

• 보어 매칭: The flange bore matches the pipe’s inner diameter for smooth fluid flow.

• High Integrity: Ideal for critical service conditions.

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Types of Weld Neck Flanges

1. Standard Weld Neck Flanges

• Commonly used in pipelines where pressure and temperature are high.

• Suitable for a wide range of applications.

2. 긴 용접 넥 플랜지

• Feature an extended hub, often used in equipment like nozzles or vessels.

• Provide additional reinforcement.

3. Reducing Weld Neck Flanges

• Used to connect pipes of different diameters.

• Maintain system integrity while accommodating size changes.

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Weld Neck Flange Dimensions

Weld neck flanges are manufactured according to international standards such as ASME B16.5, ASME B16.47, DIN, EN, and others. Dimensions vary based on nominal pipe size (NPS), 압력 등급, 표준.

Key Dimensional Factors:

• 외경 (의): Overall flange size.

• Bore Diameter: Matches the pipe ID.

• Hub Length: Length of the tapered section.

• 두께: Affects pressure rating.

• 볼트 원 직경: Distance between bolt holes.

Common Pressure Ratings:

• 수업 150

• 수업 300

• 수업 600

• 수업 900

• 수업 1500

• 수업 2500

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Materials Used for Weld Neck Flanges

The choice of material depends on operating temperature, 압력, 그리고 액체형.

Common Materials:

• 탄소강: ASTM A105, A350 LF2 (low-temp service)

• 스테인레스 스틸: ASTM A182 F304, F316

• 합금강: ASTM A182 F11, F22

• 듀플렉스 & 슈퍼 듀플렉스: UNS S31803, S32750

• 니켈 합금: 인코넬, 모넬, 하스텔로이

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Manufacturing Process

1. 재료 선택 – Choose appropriate grade for service conditions.

2. 단조 – The flange is shaped through forging for strength.

3. 가공 – Precision machining ensures dimensional accuracy.

4. 열처리 – Relieves stress and enhances mechanical properties.

5. 점검 & 테스트 – Includes dimensional checks, NDT, and pressure testing.

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웰드 넥 플랜지의 장점

• 고강도: Butt-welded connection provides excellent structural integrity.

• 누출 저항: 고압 및 고온 응용 분야에 적합.

• Smooth Flow: Bore matching minimizes turbulence.

• 내구성: Long service life under extreme conditions.

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Disadvantages

• Higher Cost: More expensive than slip-on or threaded flanges.

• Installation Time: Requires welding, which can be time-consuming.

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Applications of Weld Neck Flanges

1. 기름 & 가스 파이프라인

Used in upstream, 내의 한복판, and downstream applications due to their strength and reliability.

2. Petrochemical Plants

Ideal for transporting chemicals under high pressure and temperature.

3. 발전

Used in steam, 냉각수, 및 연료 시스템.

4. 조선 & 난바다 쪽으로 부는

Withstand harsh marine environments and high-pressure systems.

5. High-Temperature Services

Maintain integrity under extreme heat in refineries and chemical plants.

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Inspection and Quality Control

Weld neck flanges must undergo rigorous testing before being approved for service:

• 육안검사: Checks for surface defects.

• Dimensional Verification: Ensures compliance with standards.

• 비파괴 테스트 (NDT): Ultrasonic or radiographic testing for internal flaws.

• 수압 테스트: Confirms pressure containment.

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설치 지침

1. 조정: Ensure the pipe and flange bores align perfectly.

2. 용접: Perform butt-welding using approved procedures.

3. Bolt Tightening: Use a cross-pattern method for even gasket compression.

4. 개스킷 선택: Match gasket type to service conditions.

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Weld Neck vs Other Flange Types