Introduction

In the pipeline industry, you may come across RTJ flanges, which are short for ring type connecting flanges. What is the difference between this type of flange and the more common ones such as weld neck flange, slide on flange, and blind flange? How is its performance? What are the main applications and how does it work? So let’s read this article with these questions in mind.

What is an RTJ Flange?

RTJ flange, also known as ring type connecting flange, is a type of flange commonly used in high-pressure pipeline systems. The appearance of this flange has a deep groove, which is mainly used for placing metal gaskets. When two flanges are connected together by bolts and nuts, the annular gasket will be compressed into the groove, so that it can be tightly connected at high temperature, high pressure or low temperature without leakage. So this type of flange is often used in the oil and gas industry to increase pipeline safety.

What does RTJ flange mean?

RTG flange is the abbreviation for ring type connecting flange,

• R stands for Ring: refers to a circular metal gasket.
• J stands for joint: refers to connecting two flanges to form a good seal at the joint plate.

The temperature and pressure that metal gaskets can withstand are higher than those of rubber gaskets, fiber gaskets, and PTEE gaskets.

How does an RTJ flange work?

The main feature of RTJ flanges is the presence of groove rings. Its working principle is:

1. Insert a metal ring gasket into the surface groove of the RTJ flange.
2. When connecting two flanges, tighten the bolts and nuts while embedding the gasket into the annular groove.
3. When bolts and nuts are tightened, they will be quite tight. There will be no leakage under high temperature or high pressure.

Where are RTJ flanges used?

RTJ flanges are commonly used in high-pressure and high-temperature industrial pipeline systems, including but not limited to:

• Oil and gas pipelines
• Offshore drilling platforms
• Petrochemical Refinery
• High pressure steam system

If a leak occurs in this type of industry, it may cause some harm, so the safety requirements are relatively high. Use RTJ flanges more often.

What is the difference between RTJ and RF flange?

For beginners, RTJ and RF flanges may be quite similar. But both represent completely two types of flanges.

• RTJ flange: It is a type of flange characterized by a concave groove for placing metal ring gaskets.
• RF flange: It is a surface type of flange that can be used for the surface condition of different types of flanges.

What are the advantages of RTJ flanges?

The main advantages of RTJ flanges are:

• High sealing performance, even under extreme conditions such as pressure and temperature.
• High pressure resistance, RTJ flanges are often chosen in high-pressure pipeline systems.
• High temperature resistance, among which RTJ flanges are commonly used in the steam pipeline industry.
• Long service life, because it is resistant to high temperature and high pressure, and will not cause damage to it due to high temperature and high pressure.
• Can be used in the chemical corrosion industry, such as the petroleum, natural gas, and corrosive chemical transportation industries.

Are there any disadvantages of RTJ flanges?

RTJ flanges are not always advantages, and there are also some shortcomings in certain aspects:

• High cost: This type of flange and matching gasket has a higher cost.
• High precision requirements: In the production of RTJ flanges, grooves require higher machining accuracy.
• Not suitable for low-pressure pipelines: It is mostly used for high pressure, so it is somewhat underutilized in low-pressure pipeline systems.

Types of RTJ Gaskets

There are two types of gaskets suitable for RTJ flanges:

• Circular gasket: It is a commonly used gasket.
• Octagonal gasket: This type of gasket is commonly used in high-pressure environments, with flat sides and higher sealing performance.

These two types of flange gaskets are suitable for different types of RTJ flange slots.

Summary

RTJ flange, also known as ring joint flange, is commonly used in high-pressure and high-temperature pipeline systems. Its main working principle is to insert the gasket into the groove of the flange, connecting it to make the connection between the two flanges tighter and achieve higher sealing performance.

RTJ flanges are commonly used for connecting important components in industries such as oil and gas.

Regardless of the pipeline system used, RTJ flanges can be chosen as long as high sealing requirements are met.

But the price of RTJ flanges is higher than some conventional flanges, such as weld neck flange, slide on flange, and blind flange. Therefore, it is often used in necessary situations.

The above article provides a detailed introduction to RTJ flanges, hoping to be helpful for both beginners and those already engaged in the flange industry.