플랜지 돌출면과 평면면이란??

When it comes to piping systems and industrial connections, selecting the right type of flange is essential to ensure leak-proof, pressure-resistant, and structurally sound joints. One of the key factors in flange selection is the flange facing type. The two most common facing types are 제기된 얼굴 (RF) 그리고 평평한 얼굴 (FF) 플랜지.

Understanding the difference between flange raised face vs flat face is critical for engineers, 조달팀, and maintenance professionals. 이 기사에서는, we will explain the characteristics of each flange face type, 그들의 장점, 애플리케이션, and how to choose the right one for your project.

What Is a Flange Face

Before diving into the differences, it’s important to understand what a 플랜지면 ~이다. The flange face is the surface area that comes into direct contact with a 틈 메우는 물건. It plays a vital role in sealing the connection between two pipe flanges. The design of the face affects how well the joint seals under pressure and how the gasket behaves during tightening.

~에 SASAFLANGE, we manufacture a wide range of flanges with different facing types to meet global standards and industry demands. Whether you require RF or FF flanges, choosing the right face type is crucial to the safety and efficiency of your system.

What Is a Raised Face Flange

에이 제기된 얼굴 (RF) 플랜지 is the most widely used flange facing in industrial applications. In this design, the sealing surface is slightly raised above the flange’s bolt circle area. The standard height of the raised face depends on the pressure class:

For flanges in pressure classes 150 그리고 300, the raised face height is 1.6 mm (1/16 인치)
For pressure classes 400 이상, the height increases to 6.4 mm (1/4 인치)

The raised face allows the gasket to be concentrated on a smaller surface area, which improves the sealing capability under high pressure.

Benefits of Raised Face Flanges

Better sealing performance due to concentrated gasket compression
Suitable for higher pressure and temperature applications
Widely available and compatible with standard gasket types
Ideal for critical systems such as 정유소, 화학공장, 석유 및 가스 파이프라인

Raised face flanges are designed to work with spiral wound, ring, or flat gaskets and are the preferred choice for most industrial applications requiring tight, high-pressure seals.

What Is a Flat Face Flange

에이 평평한 얼굴 (FF) 플랜지 has a 평평한, even gasket surface that is level with the bolt circle area of the flange. There is no raised section, and the entire face is used for sealing.

Flat face flanges are typically used in 저압 애플리케이션, such as water treatment systems, low-pressure steam lines, and cast iron piping systems. The design helps distribute the load evenly across the entire gasket surface and is ideal where flange deformation must be avoided.

Benefits of Flat Face Flanges

Suitable for use with cast iron equipment and fittings, which are brittle and sensitive to uneven pressure
Helps prevent flange warping or cracking
Ideal for systems operating at low pressure and low temperature
Compatible with full-face gaskets for even load distribution

~에 SASAFLANGE, we offer flat face flanges specifically designed for municipal and water works projects where safety and simplicity are prioritized.

Key Differences Between Raised Face and Flat Face Flanges

설계
- Raised face flanges have a small elevated surface for sealing
- Flat face flanges have a flat, continuous sealing surface
Gasket Type
- 올려진 얼굴: spiral wound, ring type, or flat ring gaskets
- 평평한 얼굴: full-face gaskets covering the entire flange surface
애플리케이션
- 올려진 얼굴: used in high-pressure, high-temperature systems
- 평평한 얼굴: used in low-pressure, non-critical systems
재료 호환성
- Raised face flanges are compatible with most metallic piping systems
- Flat face flanges are typically used with cast iron or brittle materials
설치 고려 사항
- Raised face flanges require proper torque to compress the gasket in a smaller area
- Flat face flanges require careful bolting to avoid uneven stress and potential breakage

Choosing the Right Flange Face Type

The choice between raised face and flat face flanges depends on several factors:

Pressure and temperature rating: RF is better for high-pressure systems
Piping material: Use FF when connecting to cast iron or fiberglass
가스켓 종류: RF allows more gasket material flexibility
애플리케이션: Critical industrial systems often require RF, while municipal piping may use FF

For systems involving different flange face types, always match the same facing types on both ends of the connection. Mixing RF with FF can lead to gasket failure and joint leakage.

~에 SASAFLANGE, we help clients choose the correct flange face based on their technical requirements, 업계 표준, 및 작동 조건.

결론

Understanding the difference between flange raised face vs flat face is key to building safe and effective piping systems. Raised face flanges offer high sealing efficiency for demanding industrial environments, while flat face flanges are ideal for low-pressure systems and connections involving brittle materials.

Choosing the correct flange face type ensures proper gasket performance, system integrity, 장기적인 신뢰성. Always consult with a qualified flange supplier or engineer before making a final decision.

For premium flange solutions tailored to your project needs, 신뢰하다 SASAFLANGE — your reliable partner for high-quality flange products and expert guidance in the piping industry.