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Advantages and Disadvantages of Slip-on Flange

Slip-on Flange

Slip-on flanges are a highly popular flange used to connect pipes in various applications. They are commonly used in low-pressure and low-temperature applications and are popular because they are easy to install. Despite their popularity, they come with their advantages and disadvantages. This blog post will examine both to help you make an informed decision.

What is Slip-on Flange?

A slip-on flange, otherwise known as SO flanges, are a type of pipe fitting that makes two pipes connect securely together. This is done by inserting the end of one pipe into the lap portion or hub of the other and being held in place with a fillet weld at the intersection. The sealing of both pipes is then secured in place using either gaskets or welding.

Advantages of Slip-on Flanges:

Easy to Install:

One of the most significant advantages of slip-on flanges is that they are easy to install. They slide over the pipe and are secured to the pipe using fillet welding, which does not require a muscular man. The process is simple, and a person with basic welding skills can install it easily.


Slip-On Flanges are relatively less expensive than other flanges, making them an affordable option for low-pressure and low-temperature applications. They have no protruding hub and can fit perfectly on the pipe, saving time and cost that may be incurred when using other flange types.

Resistant to Warping:

Slip-on flanges are less prone to warping as they don’t have a hub. Because the pressure is transferred to the pipe, the chances of the flange warping are quite low. This is extremely helpful in low-pressure applications since it helps to reduce the possibility of leaks.

Disadvantages of Slip-on Flanges:

Low Pressure:

Slip-on flanges are limited to low-pressure and low-temperature applications and should not be used for high-pressure applications. They are not designed to withstand high pressure, as the lack of a protruding hub can cause the flange to peel in high-pressure areas.

Susceptible to Crevice Corrosion:

The area between the pipe and the flange can become a breeding ground for crevice corrosion that can lead to leaks. When slip-on flanges are used in environments with a possibility of exposure to corrosive chemicals, they may be more susceptible to corrosion.

Requires Skilled Welding:

Though slip-on flanges are relatively easy to install, the fillet welding process that secures the slip-on flange to the pipe requires skill. This welding process should be done correctly, or could lead to leaks and other issues.


Slip-on flanges are an excellent option for low-pressure and low-temperature applications with ease of use, lower costs, and resistance to warping. However, they are limited to such applications and can be susceptible to crevice corrosion if poorly installed. Skilled welding is also required to ensure they are adequately secured. However, slip-on flanges can be a reliable and cost-effective option for connecting pipes if used appropriately.

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