New Century Forging Co., Ltd
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November 02, 2020
Flange classification and application
The classification of flanges 1. The material is divided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy 2. Production methods can be divided into forging flange, casting flange, welding flange. 3. Divided into manufacturing standards can be divided into GB (gb) (Ministry of Chemical Industry standards, oil standards, power standards), American Standard (astm), German standard (din), Japanese standard (jb) and so on. China's national standards for steel pipe flange gb 1 flange nominal pressure: 0.25mpa-42.0mpa Series 1: pn1.0, pn1.6, pn2.0, pn5.0, pn10.0, pn15.0, pn25 .0, pn42 (main series) Series 2: pn0.25, pn0.6, pn2.5, pn4.0 2. Flange structure: a, flat welding flange pl; b, c, welded flange wn; d, socket welded flange sw; e, loose flange pj / se f, the overall tube if; g, Threaded Flange th; h, flange cover bl, bl (s). 3. Flange sealing surface type: plane ff, convex surface rf, concave fm, convex mf, tongue and groove tg, ring connecting surface rj Flange Applications Flat Steel Flange: For nominal pressure not More than 2.5mpa carbon steel pipe connections. Flat welding flange sealing surface can be made smooth, bump and mortise three. Smooth flat welding flange the largest number of applications, and more for medium conditions more modest circumstances, such as low pressure non-purified compressed air, low pressure circulating water, which has the advantage of cheaper prices. Butt Weld Flange: It is used for the counter welding of flange and pipe. Its structure is reasonable, its strength and degree of steel are large, it can withstand high temperature and high pressure, repeated bending and temperature fluctuation, and its sealing is reliable. Nominal pressure of 0.25-2.5mpa butt flange with concave and convex sealing surface. Socket welding flange: commonly used in the pipeline pn ≤ 10.0mpa, dn ≤ 40; Loose flanges: Loose flanges commonly known as looper flanges, looped flanges, flanging flanges and flanges Welded live sleeve flange. Commonly used in medium temperature and pressure are not high and medium corrosive strong situation. When the medium is corrosive, the part of the flange that contacts the medium (flanging section) is made of a corrosion-resistant, high-grade material, such as stainless steel, while the outside is clamped with a flange ring of a lower material, such as carbon steel In order to achieve the seal; the whole flange: often the flange and equipment, pipes, valves, etc. made of this type commonly used in equipment and valves.
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