Typical slip on flanges is designed to accept pipe into the bore/center of the flange slip on to allow welding both on the outside diameter (OD) of the pipe and on the interior side of the connection. You may recognize them:

Because the slip-on flange welding do not have a weld bevel, they provide an excellent alternative to weld necks, allowing the pipe to be adjusted in length according to its position.

As the bore of the slip on weld flange is large enough for the matching pipe, there should be enough room for it to fit. Welders and fabricators can make the connection with enough space.

Applications involving lower pressures are extremely common with this flange type.

Main characteristics of the slip-on flange

Slip flanges are popular because of their low material cost and ease of installation. The flanges can also be used as lap-joint flanges if Type B or Type C ends are being handled.

There are models with low pressures and a variety of diameters to choose from. Due to the absence of a neck to rest on the pipe, this flange must be double welded instead of welding neck flanges.

In dimensional terms, most slip-on flange hubs will resemble raised faces.

There are instances when a “ring style” slip-on without a hub would be appropriate if space is limited. It is still permissible to call ring-style slip-ons without hubs slip-ons, despite the popularity of hub-style slip-ons. 

Slip-ons with higher pressures often have a lap joint-like height to provide better connection. It is sometimes preferred by customers to use a pipe slip with a machined hub that resembles a lap joint when a lap joint is not readily available or hub height is not a concern.

It is more common to find slip on pipe flanges in lower-pressure assemblies when a higher-stress service requires a superior connection. In contrast, weld neck flanges are reinforced on the hub and form weld bevel connections directly to the buttweld end of pipes instead of using slip-on style flanges. Tapered hubs are more effective at handling mechanical stress.

How do slip-on flanges work?

Before welding, slip-on flanges must be inserted into the pipe. As can be seen in this case, there are two welds, which provide durability and prevent leaks. There is approximately a two-thirds reduction in the pressure resistance of welding neck flanges when using these flanges. Suitable for low-pressure applications, slip-on flanges are convenient to install and weld onto a variety of pipes. A cost-effective manufacturing process is also another advantage of welding.

For slip-on flanges to be mounted, there does not need to be much longitudinal space. It is also easier to align the pipes without having to cut them exactly.

Applications of slip-on plate flanges

These containers are generally used for fluids with low pressures or minimal leakage risks. In today’s world, these hubbed flanges are used in water cooling systems, water firefighting systems, compressed air systems, and process lines for steam, oil, gas, condensates, etc. In addition, the working conditions are not stressful and the material to be distributed is at low pressure.

 Working conditions are not stressful, and the material to be distributed is under low pressure.

Benefits of slip-on pipe flanges

  • Quite affordable.
  • Assembling and installing the product is easy.
  • A flange occupies the minimum longitudinal space.
  • Diameters range from small to large.

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