How can flanges be classified based on pipe attachment?

How can flanges be classified based on pipe attachment?
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Flange joint is one of the methods of pipe joints. Piping and flanges are classified in different ways based on pipe attachment, Pressure-Temperature (PT) rating, facing, face finish. Below are the flanges based on the pipe attachments.Classification of flanges based on pipe attachment1) Slip-on Flanges:These flanges are welded on inside as well as outside to the pipe. They are generally forged type with Hub. They can also be fabricated from plates but without Hub.2) Socket-Weld Flanges:These Flanges are welded only on outside of the Pipe. They are usually used in small bore piping where the piping specification is socket weld. They are not used in severe services due to stagnation of fluid at the socket. Socket welded flanges shall be specified with connection pipe thickness to ensure pro
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