Когда речь идет о трубопроводных системах и промышленных соединениях, Выбор правильного типа фланца имеет важное значение для обеспечения герметичности., устойчивый к давлению, и структурно прочные соединения. One of the key factors in flange selection is the flange facing type. The two most common facing types are поднятое лицо (РФ) и плоское лицо (ФФ) фланцы.

Понимание разницы между flange raised face vs flat face is critical for engineers, группы закупок, and maintenance professionals. В этой статье, we will explain the characteristics of each flange face type, их преимущества, приложения, and how to choose the right one for your project.

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What Is a Flange Face

Before diving into the differences, it’s important to understand what a поверхность фланца является. The flange face is the surface area that comes into direct contact with a прокладка. 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.

В Сасафланж, 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.

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Что такое приподнятый торцевой фланец

А поднятое лицо (РФ) фланец is the most widely used flange facing in industrial applications. В этом дизайне, 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 и 300, the raised face height is 1.6 мм (1/16 дюйм)

• For pressure classes 400 и выше, the height increases to 6.4 мм (1/4 дюйм)

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

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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 нефтеперерабатывающие заводы, химические заводы, and oil and gas pipelines

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.

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Что такое плоский фланец

А плоское лицо (ФФ) фланец has a плоский, 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 приложения низкого давления, 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.

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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

• Совместим с full-face gaskets for even load distribution

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

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Key Differences Between Raised Face and Flat Face Flanges

1. Дизайн

   • Raised face flanges have a small elevated surface for sealing

   • Flat face flanges have a flat, сплошная уплотнительная поверхность

2. Тип прокладки

   • Поднятое лицо: спиральная рана, ring type, or flat ring gaskets

   • Плоское лицо: full-face gaskets covering the entire flange surface

3. Приложение

   • Поднятое лицо: used in high-pressure, высокотемпературные системы

   • Плоское лицо: used in low-pressure, non-critical systems

4. Совместимость материалов

   • Raised face flanges are compatible with most metallic piping systems

   • Flat face flanges are typically used with cast iron or brittle materials

5. Installation Considerations

   • 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

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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

• Тип прокладки: RF allows more gasket material flexibility

• Приложение: 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.

В Сасафланж, we help clients choose the correct flange face based on their technical requirements, отраслевые стандарты, и условия эксплуатации.

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Заключение

Понимание разницы между 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, целостность системы, и долговременная надежность. Always consult with a qualified flange supplier or engineer before making a final decision.

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