General principles of filter selection

1. Import and export diameter:

In principle, the inlet and outlet diameter of the filter should not be smaller than the inlet diameter of the matching pump, which is generally the same as the diameter of the inlet pipeline.

2. Nominal pressure:

Determine the pressure rating of the filter according to the highest possible pressure in the filter line.

3. Selection of the number of holes:

The main consideration is the particle size of impurities to be intercepted, which is determined according to the technical requirements of the medium process. For the particle size that can be intercepted by wire meshes of various specifications, please refer to the table "Filter Specifications". Generally, the water distribution network is 18-30 mesh/cm2, the ventilation network is 40-100 mesh/cm2, and the oil distribution network is 100-150 mesh/cm2.

4. Filter material:

The material of the filter is generally the same as the material of the connected process pipeline. For different service conditions, the filter of cast iron, carbon steel, low alloy steel or stainless steel can be considered.

5. Calculation of filter resistance loss

For water filters, under the general calculation of rated flow rate, the pressure loss is 0.52 ~ 1.2kpa