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Sealing performance comparison of flanged joint with octagonal gasket and double wedge ring gasket
Topic Started: 21 Nov 2017, 04:54 PM (19 Views)
zhangxiaosan
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Bolted flange joint using ABAQUS finite element software to bring a new double wedge angle ring gasket octagonal ring with numerical simulation analysis, the maximum value, the maximum value of the contact pressure on the sealing surface and sealing width to analyze the stress ratio of bolt and flange Pretight mode and operating conditions. The results show that the medium pressure flange with double wedge angle ring gasket stress maximum value decreased, but the flange and bolt stress value is still higher than the flange bolts with octagon gasket stress value; flange nominal diameter increases, effective sealing width of octagon gasket inner and outer surface decreased gradually, and the double wedge angle ring the main pad from the surface, effective sealing width increases; double wedge angle wedge ring structure special cushion makes the winner, from the surface contact stress of pressure in the medium after decreased less than the octagon gasket inner and outer surface, so it has better sealing performance, especially for large diameter flange seal.CE certificated dental vacuum porcelain furnace
The development and design of new sealing elements is one of the development directions of gasket sealing technology. In 2001, Kurokouchi and other ring metal pad structure improvements, first put forward a wedge gasket. Because of its good sealing performance, the new wedge gasket has been widely concerned by researchers, and has been improved on the basis of different engineering requirements. In 2003, Aaron and John proposed the application of wedge gasket in underwater pipeline sealing in order to solve the requirements of underwater sealing technology for a large number of subsea pipeline construction projects. Referring to its design concept, China has begun to apply the wedge gasket to the subsea pipeline connection. In 2009, American Taper-lok company put forward a new type of double wedge angle ring gasket. In order to study the sealing performance of the new double wedge gasket, Madazhy et al. Carried out the finite element analysis and the hydrostatic test on the contact pressure distribution of the new double wedge ring gasket with 3 bolts in the flange joint, and compared it with the traditional flat gasket. The results show that the new ring gasket has better sealing effect. At the ASME pressure vessel and Piping Conference in 2010, Gardner et al. Applied the double wedge ring gasket to the high pressure heat exchanger, replacing the welded clapboard to prevent leakage, and achieved good results. In 2013, Xu Yongjie and Lu Xiaofeng studied the influence of the structure size of double wedge ring gasket on its sealing contact pressure by numerical simulation.
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At present, there are few reports on the performance of this new type of double wedge ring gasket at home and abroad, especially its structural integrity and leakage tight sealing are not systematically studied. Bolted flange joint by using ABAQUS finite element software respectively using the new double wedge angle ring gasket and the octagonal pad bolted flange joints are simulated, value, sealing surface contact pressure and sealing width are analyzed on the stress of the flange and the 2 flange joint bolt pre tightening condition and operation in the condition, which provides a reference for exploring the application of this new type of double wedge ring gasket in practical production.
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