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在过滤工艺中 ,首先要求过滤元件具有特定的过滤精度 ,即滤除特定大小粒子的能力。这一特性常用元件在液体过滤过程中阻挡某尺寸粒子的过滤效率为 98%时的值来表征 ,这样就使过滤元件基本特性的表征方式更接近实际使用状态的概念 ,使用部门便可根据各自的工艺特性很方便地选用不同等级的过滤元件。GB/T6 886 - 1986“烧结不锈钢过滤元件”中 ,元件阻挡某尺寸粒子的特性用“气泡试验孔径”值来表征 ,由于测定原理表征方式不同 ,这种孔径值与实际使用要求值有着较大的差异 ,往往形成使用部门对元件的可靠性产生疑惑甚至误解 ,因此国家有色金属工业局提出对该标准的修订 ,采用国际标准ISO - 45 72检测特定过滤效率值时所阻挡的固体颗粒尺寸值作为过滤元件等级的区分标准 ;采用国标规定的不锈钢牌号名称 ,并将C %含量严格限制在该牌号允许的含量范围内 ;将法兰的规格及联接形式作了适当变动 ;同时增加6 0mm管、删除部分规格 ;增加了附录A“烧结金属过滤元件耐压强度试验”。该标准由西北有色金属研究院负责起草 ,修订后的该标准GB/T6 886 - 2 0 0 1代替GB/T6 886 - 1986。
In the filtration process, it is first required that the filter element have a specific filtration precision, ie the ability to filter out particles of a particular size. This feature commonly used components in the liquid filtration process to block the particle size of a filter efficiency of 98% when the value of the characterization, so that the basic characteristics of the filter element to characterize the way closer to the actual use of the concept, the use of the Department according to their respective The process characteristics are easy to use different levels of filter components. GB / T6 886-1986 “sintered stainless steel filter element”, the characteristics of the components to block a certain size particles with “bubble test pore size” value to characterize, due to the determination of the principle of characterization of different ways, the aperture value and the actual use of the required value has a larger Of the difference, often forming the use of the Department of the reliability of the components have doubts or misunderstandings, the National Nonferrous Metals Industry Bureau proposed the revision of this standard, the use of international standards ISO - 45 72 detection of specific filtration efficiency value when the value of the solid particles blocked by the value As a filter element level of the distinction between the standard; the use of national standards of stainless steel grades, and the C% content is strictly limited to the allowable content of the grade range; the flange of the specifications and connections made the appropriate changes; while increasing 660mm Tube, delete some of the specifications; Added Appendix A “sintered metal filter element compressive strength test.” The standard is drafted by Northwest Nonferrous Metal Research Institute. The revised standard GB / T6 886-2001 replaces GB / T6 886-1986.