Filter selection

Filter design is mainly empirical, experience and experiment are the determining considerations when designing new equipment. The question arises, to what extent this approach takes adequate account of all influencing parameters and relationships and how far technical theorems could offer a design aid. This implies the consideration as to what degree an analytical calculation is permissible.

The following data, forms part of the material specification of a filter:
• Type of material
• Weight per unit area
• Thickness of layer
• Volume flow per unit of surface
• Pressure loss at nominal volume flow
• Permissible static pressure difference.