🔷 Overview of RF and RTJ flanges

In piping and industrial valve systems, flanges are essential components used to connect pipelines and ensure sealing performance.

The two most common types are:

• RF (Raised Face flange)
• RTJ (Ring Type Joint flange)

👉 Both are used in high-pressure systems, but their sealing performance is different.

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⚙️ What is an RF flange?

An RF (Raised Face) flange has a slightly raised sealing surface and uses soft gaskets such as:

• Spiral wound gasket
• PTFE gasket
• Graphite gasket

📌 Key features:

• Most commonly used flange type
• Easy installation and maintenance
• Sealing depends on soft gasket compression
• Suitable for medium to high pressure systems

👉 RF flanges are widely used in general industrial applications.

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⚙️ What is an RTJ flange?

An RTJ (Ring Type Joint) flange has a machined groove that uses a metal ring gasket (oval or octagonal shape).

📌 Key features:

• Extremely high sealing performance
• Suitable for very high pressure (Class 600 – Class 2500)
• Uses metal-to-metal sealing
• Requires precise machining

👉 RTJ flanges are commonly used in oil & gas and critical services

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📊 RF vs RTJ comparison

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🏭 When should you use RF flanges?

Choose RF flanges when:

✔️ General industrial systems

• Water, steam, gas
• HVAC systems
• Industrial plants

✔️ Medium to high pressure systems

✔️ Easy maintenance is required

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🏭 When should you use RTJ flanges?

Choose RTJ flanges when:

✔️ Extremely high-pressure systems

• Offshore oil & gas
• Refineries

✔️ Critical and hazardous applications

✔️ Zero-leakage requirements

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❓ Which one seals better: RF or RTJ?

👉 RTJ provides better sealing performance than RF

Because:

• RTJ uses metal-to-metal sealing
• Gasket is compressed inside a machined groove
• Less affected by pressure and temperature changes

However:

• RF is sufficient for about 90% of industrial applications
• RTJ is required only for high-end critical systems

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⚠️ Common mistakes

• Using RF in ultra-high pressure systems → risk of leakage
• Using RTJ in simple systems → unnecessary cost increase
• Using incompatible gaskets

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🔥 Quick selection tips

👉 Standard industrial systems → choose RF
👉 Oil & gas / high-pressure systems → choose RTJ

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🏁 Conclusion

RF and RTJ flanges are both important sealing solutions:

• RF = economical, flexible, widely used
• RTJ = maximum sealing, used for extreme pressure

👉 Choosing the correct flange helps:

• Improve system safety
• Prevent leakage
• Optimize cost efficiency

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📞 Contact Information

Phuc Minh Engineering Co., Ltd (PM-E) specializes in supplying flanges, valves, gaskets, and piping components meeting international standards.

• 🌐 Website: pm-e.vn
• 📧 Email: info@pm-e.vn
• 📱 Hotline: +84 907 450 506 – +84 902 720 814 – +84 979 737 351