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What is the Classification of Flanges & Difference Between Orifice Flanges and Other Flanges?



What is the Classification of Flanges?


Flanges can be divided into threaded flanges and welded flanges. Threaded flanges are used for low pressure and small diameter circumstances while welded flanges are used for high pressure and large diameter circumstances. The thickness of the flanges of different pressures and the diameter and number of connecting bolts are different. Depending on the level of pressure, the flange gaskets are also varied from low or high-pressure asbestos gaskets to metal gaskets. Connecting with flanges are easy to operate and can withstand large pressures.


Flange connections are widely used in industrial piping. If you are in a boiler room or production site, pipes and equipment that are connected with flanges can be seen everywhere. Whereas the flange connection is hard to find in a home-used pipeline with a small diameter and low pressure.



What is the Difference Between Orifice Flanges and Other Flanges?


As we have mentioned above, a normal flange connection is to fix two pipes, fittings or equipment to a flange firstly, then add a flange gasket between the two flanges, and fasten them together by bolts. While an orifice flange is a device used to measure the flow rate of liquids and gases, for reducing pressure or for restricting flow. The orifice plate is in the middle of two flanges, and the pressure is measured through the pressure measuring point on the flange and the differential pressure transmitter.



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