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Slip-on flanges

Slip-on flanges

  • Description

A slip-on flange is a common type of pipe flange that is used to insert the pipe into the inner bore/center of the flange for welding on the pipe outside diameter (OD) and inside the connection. You may recognize the following types of flanges:

 

A slip-on flange is a simple and excellent alternative to weld necks because it does not have a weld bevel, so the length of the pipe can be adjusted relative to the position of the flange.

 

The inner bore of the slip-on allows ample room for the mating pipe. This gives the welder and fabricator ample working space to make the connection.

 

This flange type is very common in low pressure applications. Most slip-on flanges have a hub, which is usually similar in size to the raised face. If space is limited and the application allows for a "ring" slip-on, the hub can be omitted.

 

Higher pressure rating slip-ons are often available with a lap joint height to allow for a better connection. If hub height is not an issue and lap joints are not readily available, customers sometimes choose to use a lap joint style slip-on with a machined hub.

 

This is because the slip-on flange can connect pipes connected by fillet welds, while the bottom of the butt-weld flange has a reinforced hub that can directly form a weld groove connection with the butt-weld end of the pipe. This tapered hub can provide stronger support in a mechanical stress environment.


  • Specification

1. Slip-on flange welding type

There are two main types of slip-on (SO) flanges: SO welded plate flanges and SO welded hub steel pipe flanges.

 

This flange combines the advantages of integral flanges and loose flanges, with a simple design and easy processing, so slip-on flange welding is widely used in various fluid pipelines.

 

2. Raised slip-on flange

The bottom surface of the raised slip-on flange has a small protrusion. During installation, this convex surface can be used as a designated placement area for the gasket, thereby enhancing the overall sealing performance.

 

3. RTJ slip-on flange

For RTJ slip-on flanges, a small groove is precisely machined on its convex part. This unique RTJ design is designed for high-pressure applications and provides a secure groove for the installation of the gasket, ensuring a better sealing than the RF type.

 

Kingrail Parts stocks flanges in a variety of sizes and specifications.

 

Frequently Asked Questions (FAQ)

1. What is a slip-on flange?

A slip-on flange is a pipe flange that slips over the end of a pipe and is secured with bolts that align with pre-drilled holes.

 

Its inside diameter is designed to be slightly larger than the pipe so that it can be easily "slipped in" before being secured. It is typically used in low to medium pressure systems.

 

2. What are the advantages of a slip-on flange?

The design allows for quick assembly without complicated welding or alignment, making it ideal for projects with tight deadlines.

 

Because slip-on flanges have a simpler design and manufacturing process, they are generally less expensive than other flanges, such as weld neck flanges or blind flanges.

 

3. When should a slip-on flange be used?

These flanges are not designed to handle high pressure or high temperature systems, so they are ideal for standard applications where pressure is not a concern.

 

Slip-on flanges are a cost-effective option when budget is a key factor and the application does not require the strength and durability of more expensive flanges.

 

4. When should a slip-on flange not be used?

Slip-on flanges are not designed to work in high-pressure systems and may fail or leak under extreme pressure.

 

Slip-on flanges are not designed to provide the same vibration resistance as other types of flanges, such as welded or socket weld flanges, which can cause the connection to fail over time.

 

5. How do I install a slip-on flange?

Make sure the end of the pipe and inside the slip-on flange are free of debris. Slip the slip-on flange over the end of the pipe. The flange should fit snugly, but without force.

 

Rotate the flange as needed until the bolt holes on the flange align with the corresponding holes on the pipe or fitting. Insert the appropriate bolts through the aligned holes.

 

Tighten the bolts in a crisscross pattern to evenly distribute pressure and achieve a proper seal.

 

Get more help

Kingrail Parts offers a wide range of forged flanges. If you need a forged flange, please contact us. Our flange experts will give you the best advice and a free quote.


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