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Influence factors of gasket sealing effect
Topic Started: 22 Nov 2017, 05:57 PM (23 Views)
zhangxiaosan
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Gasket diameter, roundness, width, thickness will appear structural deviation. With the large-scale development of petrochemical equipment, the equipment flange and its gasket are also designed with large diameter. For the graphite wave gear composite gaskets commonly used in petrochemical plants, the enlargement of the gasket diameter and the rough holes in the standard provisions of the gasket increase the complexity of the gasket products. In fact, the large diameter gasket will cause the increase of the circumferential joint of the material, resulting in the difference of the material properties and the possibility of cracking between the joint and the base metal, and the size machining accuracy is difficult to guarantee. The actual value of gasket coefficient or preload pressure does not necessarily meet the recommended value of product design because of the quality of gasket manufacturing.
Gasket structure deviation will affect the gasket installation effect, gasket installation deviation can further reveal the consequences of gasket structure beyond the error. The sealing structure usually rules that the inner diameter of the gasket is larger than the inner diameter of the flange, and its allowance does not intercept the inner diameter of the flange as long as the gasket is pressed or expanded by the medium. The outer diameter of the gasket is smaller than the diameter of the sealing surface of the flange, so that the gasket can be easily loaded into the flange of the concave flange, but the gap can not be too large, otherwise it will increase the stress level of the flange stud, and it is difficult to install the gasket in the process.1300 degree celsius vacuum quenching furnace
In general, the unilateral radial clearance between the nominal diameter of more than 2000 mm pipe flange of the heat exchanger concave rabbet diameter and the outer diameter of pad basic value reached 5.5 mm, accounting for common gasket width N = 20 mm 27.5%, accounting for the gasket effective width b = 2.53, B0 = 0. =2.53, 5N 8 mm 68.8%. If the installation is improper, the effective sealing width of gasket will be seriously weakened. Therefore, the gap should be considered together with the shim size deviation and should be controlled to be 2 mm.directly drive two stage sliding vane vacuum pump with long life
The traditional method of mounting pad, is on the side of the sealing surface to a few points last week with a small amount of grease, pressure on the gasket, with viscous grease under normal temperature the gasket stick, then the other side of the sealing surface to cover gasket, and then through the bolt fastening sealing surface. For the horizontal heat exchanger sealing surface of the vertical installation, large size and more self adhesion gasket, gasket are falling offset problems; for the large size of the sealing surface of the sealing gasket installation level, the surface cover behind and in front of the sealing surface is not completely parallel, or every bolt tightening force is not uniform, will make shim is the horizontal offset of the extrusion. As shown in Fig. 2, when the gasket center O1 is left offset (B1 - B2) along the XX axis, the gasket basic sealing width is reduced from B1 to B2, and the effective sealing width is also reduced correspondingly.PVD vacuum coating machine system
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