석유 및 가스와 같은 산업의 배관 시스템, 화학 처리, 수처리, 그리고 발전은 강한 것을 요구합니다, 누출 방지, 및 분리 가능한 연결. One of the most widely used connection methods is flanging a pipe—a process that involves attaching a flange to the end of a pipe so it can be bolted to another pipe or fitting.

This comprehensive guide explains how to flange a pipe, including the tools, 기법, 재료, and safety considerations involved. Whether you’re a plant maintenance engineer, pipefitting technician, or procurement professional, understanding the correct flanging procedure ensures reliable performance, 안전, 국제 표준 준수.

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What Is Pipe Flanging?

Pipe flanging refers to the process of connecting a flange to the end of a pipe. The flange acts as a structural component that allows for easy assembly and disassembly of piping systems. Flanged joints provide:

• Leak-proof sealing

• High-pressure and high-temperature resistance

• Easy maintenance and replacement

• Versatile connection to valves, 슬리퍼, or equipment

Flanges can be welded, 스레드, or lap-jointed to pipes, depending on the application and material type.

SASAFLANGE offers a complete range of industrial flanges in carbon steel, 스테인레스 스틸, and alloy steel with global delivery and certification.

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Types of Pipe Flanges

Before beginning the flanging process, it’s important to choose the right type of flange:

• 용접 목 플랜지 (WN): For high-pressure systems; requires butt-weld connection

• 슬립온 플랜지 (그래서): Slips over the pipe and fillet welded

• 소켓 용접 플랜지 (SW): For small-diameter pipes; socket fit with fillet weld

• 스레드 플랜지 (일): For low-pressure systems without welding

• 랩 조인트 플랜지 (엘제이): Used with stub ends for systems requiring frequent dismantling

• 블라인드 플랜지 (BL): Used to block off pipe ends or vessel openings

The choice of flange type depends on pressure class, piping material, 서비스 매체, 및 유지 관리 요구 사항.

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Materials and Tools Required

재료:

• Pipe and matching flange (same material and schedule)

• 틈 메우는 물건 (spiral wound, 고무, PTFE, 석묵, 등.)

• Bolts and nuts (according to ASME B16.5 또는 EN 1092-1 기준)

• Sealant or anti-seize compound (필요한 경우)

Tools:

• Pipe cutter or saw

• Beveling machine or grinder (for weld neck flanges)

• Welding machine (TIG/MIG/SMAW)

• Torque wrench

• Flange alignment tool

• Measuring tools (caliper, level, square)

• 개인 보호 장비 (PPE)

SASAFLANGE provides flange sets with compatible gaskets and fasteners to simplify the installation process.

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파이프 플랜지를 붙이는 방법: Step-by-Step Process

1. Preparation and Safety

• Wear PPE: gloves, goggles, safety shoes, and helmet

• Clean pipe ends and flanges to remove debris, 기름, or rust

• Inspect flange surface and pipe for flatness, roundness, and cracks

• Check material specifications and dimensions

Safety first: Ensure the work area is well-ventilated and free from flammable materials if welding is involved.

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2. Cutting the Pipe to Length

• Use a pipe cutter or band saw to cut the pipe to the required length

• Ensure the cut is straight and square to allow proper flange alignment

• Deburr the edges using a file or grinder

Accurate cutting helps achieve correct gasket face alignment and prevents leaks.

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3. Beveling the Pipe (If Using Weld Neck Flange)

• Bevel the pipe end at a 37.5° angle for butt welding

• The bevel allows for full penetration welds and strong joint integrity

• Clean the bevel area with a wire brush or cloth

Use a beveling machine for consistent results on large-diameter pipes.

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4. Aligning the Flange

• Slide the flange onto the pipe end

• For lap joint flanges, ensure a stub end is used

• Use a flange alignment tool or level to align bolt holes with mating flange or template

• Ensure the gasket face is square and centered

Proper alignment avoids bolt hole mismatch and uneven gasket compression.

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5. Welding the Flange (If Required)

을 위한 용접 목 또는 슬립온 플랜지:

• Tack weld in three points to hold alignment

• Perform root pass followed by fill and cap passes

• Use appropriate welding procedures (WPS) and electrodes

Post-weld inspection should include:

• 육안검사

• 염료 침투 테스트 (for critical services)

• Radiographic or ultrasonic testing if required

SASAFLANGE flanges can be delivered with beveled or custom-machined ends to match client welding procedures.

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6. Gasket Installation

• Choose the correct gasket based on pressure, 온도, and media

• Place the gasket between the two flange faces

• Ensure it is centered and undamaged

• Avoid over-handling the gasket before installation

Gasket selection is critical—SASAFLANGE can recommend compatible gasket types for different flange materials.

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7. Bolting the Flange

• Insert bolts through aligned bolt holes

• Use a star pattern to tighten bolts incrementally

• Apply torque in 3 stages: 30%, 60%, 그리고 100% of the target torque

• Use a calibrated torque wrench for accurate loading

Uneven or over-tightening may damage the gasket and lead to leaks.

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8. 압력 테스트 및 검사

After assembly:

• Conduct 수압 테스트 to verify leak-tightness

• Inspect for visible leaks, flange rotation, or bolt loosening

• Record pressure and hold time based on project specification

Any leak or pressure drop must be investigated and corrected before commissioning.

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Flanging Best Practices

• Use compatible materials: Ensure pipe, 플랜지, 볼트, and gasket match in strength and corrosion resistance

• Always use a torque wrench: Manual tightening can lead to uneven load

• Avoid reusing gaskets: Always use a new gasket for proper sealing

• Store flanges properly: Protect machined faces from damage and corrosion

• Label and document: Track heat numbers and certificates for quality control

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피해야 할 일반적인 실수

• Misalignment of flanges leading to leakage

• Incorrect flange type selection

• Overheating during welding causing flange distortion

• Using wrong bolt torque or tightening sequence

• Neglecting NDT or pressure test after installation

Partnering with trusted suppliers like SASAFLANGE helps avoid these issues with precision-manufactured flanges and expert support.

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Applications of Flanged Piping

• 기름 & 가스: Flowlines, 정유소, 해양 장비

• Petrochemical Plants: 원자로, 파이프라인, 저장 탱크

• 발전: Steam systems, 콘덴서, cooling towers

• 수처리: Intake and discharge lines

• 음식 & 음료: Hygienic piping systems (using stainless flanges)

Every application demands flanges with specific pressure ratings, 표면 마감, and material properties.

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Why Choose sasaflange?

SASAFLANGE is a global manufacturer of high-performance forged flanges. Advantages include:

• Full range of flanges: ASME, EN, JIS, DIN, 고스트

• 재료: 스테인레스 스틸, 합금강, 탄소강, 니켈 합금

• 크기: DN15 to DN2000 (1/2″ to 80″)

• 압력 등급: 150# 에게 2500#

• 서비스: 가공, 교련, 표면 마무리, 압력 테스트

• 인증: EN10204 3.1, 3.2, 소아과, ISO 9001, CE

From standard deliveries to nuclear and offshore projects, SASAFLANGE ensures quality and reliability in every flange.

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결론

Flanging a pipe is a critical procedure in any piping system, and doing it correctly ensures leak-free performance, 안전, 그리고 긴 서비스 기간. By following the proper preparation, 조정, 용접, gasket installation, and bolting methods, you can achieve high-quality flanged joints for any industrial application.

With high-precision flanges, expert advice, and full compliance with global standards, SASAFLANGE is your trusted partner in flanged piping solutions.