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The importance of backup rings to O rings

Backup rings are ultimately used to help stop o ring migration, and they achieve this in both static and dynamic fluid power applications as the pressure cycles occur, preventing the extrusion of an o ring in the gap.  Ultimately a backup ring is a rigid ring that...

Gasket manufacturing process explained

Specialist Sealing Products have been providing high-quality gaskets to customers throughout the UK for many years. We pride ourselves in the range of gaskets we have available, suitable for a variety of applications across a range of industries.  Rubber gaskets are...

Designing seals for the food industry

There’s a number of factors to take into consideration when designing seals for the food industry. That’s because seals used within this sector need to work exceptionally hard in all food processing environments where hygiene and health and safety are of the utmost...

Storing your gaskets!

A strange headline for a gasket article, we know.  However, it’s an important area and one, which in this sector is often overlooked.  When we think about most products or items in and around our homes and business, we will recognise that most come with manufacturing...

Flange Gasket materials – What you need to know

Getting the most out of flange gasket materials and ensuring the performance of the gasket is not affected when you come to use it, means several things must be taken into consideration.  For example, factors such as their design, how they’re manufactured, installed,...

Spiral Wound Gaskets and Sheet Gaskets

Gaskets come in a range of different shapes and sizes.  All are offering similar functionality; gaskets are produced using a range of different materials to suit a range and a variety of environmental factors, industrial uses, and product requirements.  When it comes...

Benefits of Kammprofile Gaskets

Used to prevent leakage, gaskets are constructed to fit between a range of different sizes and types of surfaces in order to provide the perfect seal.  Typically used in pipes and heat exchangers, gaskets are widely used as industrial sealants.  Kammprofile gaskets,...

Purpose of a Kammprofile Gasket

The ultimate purpose of a gasket is to stop leaks while being able to deal with varying levels of compression.  When it comes to Kammprofile gaskets, these are ideal for standard pipeline and heat exchanger applications.  As due to their grooved metalcore, with a...

Are your gaskets completely compliant?

In industries where gaskets are not just important but essential, there are numerous challenges to be faced and considerations to take on board.  This is especially true when it comes to making sure this “essential” element is also compliant.  With the implementation...

Everything you need to know about Manway Gaskets

When it comes to manway gaskets, we want to keep things simple, introducing them as the small sealing ring found in hatches/openings that are constructed for large tanks. Openings which give people access to the inside of the aforementioned tanks and vessels. The...

Difference Between Ring Type Joint and Raised Face

Difference Between Ring Type Joint and Raised FaceIntroduction 

If you are new to the industry, you might not know the difference between Ring Type Joint and Raised Face. The difference is actually pretty simple and refers to the type of flange that you need to use when making your join.   

In this post, we will compare RTJ and RF so that you understand the differences more completely. Both types of joins are useful, but each has their own advantages and disadvantages. This post should give you more clarity and help you to identify what projects the different flanges are best suited for.   

 

Differences: Ring Type Joint vs Raised Face

Raised Face 

This is the type most commonly found in processing plants. When you see it, you will be able to recognise it straight away. In this model, the surfaces to attach the gasket to are raised. The bolting circle will always be lower than the gasket surfaces.  

The advantages are : 

  • You can use a wider range of gaskets – from spiral wound types to flat ring sheet types.  
  • As the surface is raised, it is more easily accessible. Replacing a worn gasket is thus a lot easier.  
  • This design enables more pressure to be concentrated onto a smaller gasket area. This, in turn, helps the joint handle pressure containment better.   
  • It is also useful when you need better separation between the two flanges being joined.  

  

Ring-Type Joint  

These are more commonly used in applications where either high pressure or high temperature is an issue. These are Class 600 or more flanges or where temperatures typically exceed 427° Centigrade.  

These flanges can be identified because they have grooves that are cut into their service. A metallic gasket is fitted into these grooves and then compressed to create a solid seal. The gasket is somewhat mangled in the process but fits into space perfectly.  

The advantages are:  

  • Metal to metal seals is made possible. These are a lot stronger and will withstand high heat, pressure and corrosion caused by chemicals.  
  • The grooves allow for a tighter fit and can be useful in situations where space is an issue.   
  • Depending on the type of gasket used, the faces may be in direct contact with one another.  
  • The gasket is not going to compress any more once it has been tightened. This makes it more resistant to movement and vibration.  
  • You have a reduced range of options when it comes to the type of gaskets that you can use. However, if you choose the right type for the job, the seal is highly reliable and strong. 

Conclusion 

As you can see, there are advantages to both types of flanges. You need to use the best design option for your project. It just pays to remember that you should always use the right connections for the best join possible.  

Using an RF connection on an RTJ is a recipe for disaster. It may hold initially, but something is bound to go wrong further down the line with this kind of tinkering.   

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