Plate flange vs Slip-on Flange

There are many kinds of flanges available in the market like blind flanges, butt weld flanges, slip-on flanges, weld neck flanges, and more. Here in this blog, we’ll discuss slip-on vs. plate flanges.

Meaning of plate flanges

Plate flange is a circular, flat disc welded to the pipe’s end. It enables the flange to be bolted to another pipe. It is often referred to as the flange slip, plane flange, flat flange, etc. Two plate flanges can be bolted together with a gasket in between them, usually used in water and fuel pipelines.


The pipe length is not always known while constructing a pipeline. The plates may also be welded with a slight bias to the shaft, allowing the two pipes not to match up and join.

Plate flanges come with a notched finish on the inner mating surface that allows the plate to fit within the gasket material. In any given dimension, plate flange designs are standardized, apart from the materials used to manufacture them. It ensures that the fit is exactly like a 6-inch (15 cm) black pipe flange to a 6-inch stainless steel flange.

Meaning of slip-on flanges

Slip-on flanges are also known as reducers, or SO flanges. Long-tangent elbows and swags are built to slip over the pipe’s outer surface. The flange has low shock resistance and vibration. If you align a slip-on flange, it is easy than any other flange.

 

The slip-on flange suits the applications with less pressure compared to strength. It is around one-third of the weld neck flange while under internal pressure. SO or Slip flanges are usually cheaper than making them a common choice for the customers. A fillet weld is often welded to the exterior or back of the slip-on flange. With less initial cost, they are favored over other flanges by many customers.

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