Selection of the filter screen for the pre-filter of a shielded pump? Requirements for the number of eyes?
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The liquid transported by the shielded pump contains a small amount of silicon powder. As we know, silicon powder is very fine; it’s not clear what size of filter mesh would be necessary to ensure the pump can operate for a long period of time
The specific mesh size should be determined based on the medium transported by your organization.
\"sh/t3411-1999 Selection, Inspection and Acceptance of Filters for Pumps\" 4.2.7 When the pump has no special requirements regarding the medium to be transported, a 30-mesh filter screen can be used. \"HG/T 20570.22—95 Installation of Pipeline Filters\": 2.0.1.2, 2.0.2.1 Temporary filters can be classified by structure into flat-type, basket-type, T-type, Y-type, etc. The plate (porous) type is commonly used in the suction piping of centrifugal pumps. Basket, T, and Y types are commonly used in the suction pipes of reciprocating compressors or liquids with high viscosity such as oils. For the filter media used in temporary filters, a filter medium with 100 pores/cm2 is generally selected. Mesh filters are widely used in chemical processing units; they can be used as temporary or permanent filters placed before centrifugal pumps, gear pumps, screw pumps, steam reciprocating pumps, and fuel nozzles in industrial furnaces. The number of mesh holes before the pump is generally 144–256 holes/cm2, as specified in the product data for the pump and nozzle. The maximum number of pores can reach 400 pores/cm2. It is best to separate the silicon powder before feeding it into the shielded pump. It will wear down the graphite sleeve.
The bearings of shielded pumps are made of SiC, which provides wear resistance. The filter at the pump inlet is usually 40-mesh. For the selection of shielded pumps, an option with an external sealant tank can be chosen.