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Flat welding flange vs butt-welding flange

Views: 0     Author: Site Editor     Publish Time: 2021-06-21      Origin: Site

The two sealing faces of the bolt knead each other to form the flange gasket and seal, but this together also leads to the failure of the seal.  In order to maintain the seal, you have to maintain a huge bolt force, and for that, you have to make the bolt very large.  Large bolts have to match large nuts, which means that bolts with large diameters are needed to tighten the nuts.  However, the larger the diameter of the bolt, the applicable flange will become tortuous, the method is to increase the thickness of the flange part.  The entire installation will require a great deal of scale and component, which is a particular problem in offshore environments where component is always a major concern.  And, fundamentally, flat-welded flanges are an ineffective seal, requiring 50% of the bolt load to be used for kneading the gaskets and only 50% of the load to be used for holding the pressure.  

Flat welding flange features:  

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Flat welding flange not only saves space, reduces the component, it is very important to ensure that the joint part will not leak, with excellent sealing function.  The compact flange size is reduced by reducing the diameter of the seal, which reduces the cross section of the sealing face.  Second, the flange gasket has been replaced by a sealing ring to ensure that the sealing face matches the sealing face.  In this way, very little pressure is required to compress the cover tightly.  With the reduction of the required pressure, the size and number of bolts required can be reduced accordingly, so a new product with small volume and light weight (70%~80% less than the weight of the traditional flange) is eventually planned.  Therefore, flat welding flange type is a kind of relatively high quality flange products, reduce the quality and space, has played an important role in industrial use.  

Butt-welding flanges are suitable for pipelines with large fluctuations in pressure or temperature or pipelines with high temperature, high pressure and low temperature. Butt-welding flanges are also used for conveying expensive, flammable and explosive media on the pipeline.  Butt-welded flange is not easy to deformation, good sealing, widely used, the nominal pressure of butt-welded flange PN at about 16MPa.  Butt-welded flange connection is easy to use and can withstand greater pressure.  

Butt-welding flange features:  

1. The fluid resistance is small, and the sealing surface is subject to small attack and erosion by the medium.  

2. Open and close with less effort.  

3. The flow direction of the medium is not restricted, not disturbing, not reducing the pressure.  

4. Simple shape, short structure length, good manufacturing technology, wide range of application.  


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