What Is A Flange Gasket?

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A flange gasket is used to fit or join two sections of pipes together with each pipe typically having a flared area where the gasket attaches to. There can be many types of flange gaskets from standard, custom, ring, full face gaskets and more. They can be non-metallic, semi-metallic or metallic in material composition. Flange gasket thicknesses can vary as does shape according to what design it will be used for. Consider this basic flange gasket selection guide which can assist you in determining what type and materials of gaskets would work best with your home or business. If ever in doubt, consider further research and the help of a qualified professional.

How does flange gasket work?

A  flange gasket is used in order to create a seal between two flange faces at different conditions, pressures, and temperatures. There are microscopic spaces and irregularities on flange faces that different types of gaskets will fit into for a tight seal against both liquids and gases.

What is the difference between gasket and packing?

A flange gasket is any mechanical seal that fills the space between two objects usually to prevent leaking between them while under compression. Packing can technically be used as an action verb for gasket use. However, they are also used as a term as materials that also are used to provide compression seals for pumps and valves. They can also be referred to as valve packing, pump packing, compression packing, braided packing or mechanical packing.

What’s the best gasket material?

Gasket materials are made and manufactured for different purposes and can range in advantages for various situations. Some may even be made for specific environments which it’s why it’s not realistic to determine any best material as they are made differently to fit a specific scenario. It’s better, therefore, to consider common gasket materials with a type of use. With silicone rubber materials you’ll have resistance against high temperatures and weather while also touting exceptional electrical insulating properties. Due to these advantages, these are suitable for outside areas. With a neoprene sponge, you’ll have a material that’s chemically inert which makes it suitable for industrial applications when the use of oil, petrol or chemicals are used. They can repel moisture, dust, and water as well as withstand high compression levels. A material that works with aggressive chemical and fuels is vitrol FKM. This material is known for its high resilience properties which makes it a great choice to be used with these substances.With neoprene rubber, you’ll have a high resistance to ozone and weather which make them great for outdoor and marine applications. They are good for use of refrigerants, animal and vegetable oils. As of such another popular gasket material that is used for general use all around is natural rubber. Although it’s water resistance and can withstand mild chemicals, tearing and abrasion it should not be used near fuel. With nitrile butadiene rubber (NBR) you’ll see most effective use with oil, petroleum oils, water, and silicone greases. A material that is used with oil and fuel pumps is Cork. This material is known to be flexible, solvent resistant, resist high levels of compression and have high anti-vibration characteristics. Finally, a strong fibrous material known for high heat and chemical resistance is asbestos. Since this material is harmful there has been a rise in non-asbestos reinforcement fibers that can take its place.

Set of Gaskets With Calculations of Flange Boltings on a Paper Below

What are the types of flange?

Here are some example of flange gasket types and uses.

Flange Gasket Types and Uses

  • Spiral Wound (used for higher temperatures and pressures)
  • Ring Joint, styles R, RX, BX (used for RTJ flange faces)
  • Non-Asbestos, full and raised face (used for low pressure and temperatures, non-critical applications)
  • Kammprofile (used for  equipment that has high movement like large vessels or heat exchangers) 
  • Jacketed (used in cases of high temperatures and pressure, high load exhaust and heat exchangers)

What is the difference between Series A and B flanges?

A Series A flange is thicker and heavier than a series B flange yet the latter will incorporate more holes, be lighter and cheaper.

What does flange class mean?

Classes of flange basically determine the temperature and pressure ratings of a particular series of flange. For example, a Class 300 flange can handle more pressure than a Class 150 one since the former is constructed with more metal and can withstand higher pressures.

Contact A Professional For Assistance

When you’re considering how to select a flange gasket than rely on the assistance of a professional to see you through! From ductwork gaskets that can assist with the finer working of indoor air quality from your HVAC unit to a flange gasket that works particularly well with your main water pipeline, there’s a professional technician out in your area that is ready and able to assist you! As with any system for your home or business be sure to have your property inspected before any installations or repairs. This will not only catch problem areas where they lie but will save you on future costs and time by localizing issues.

If you’d like help with a flange gasket in , TX call 817-770-0811 with Haltom Industries!