Cartridge filters are developed for remove of dust, rust and other solid particles from a stream of
dry gas or air.
Design and function
Cartridge filters are encased in welded bodies designed in conformance with the standards governing
the construction of pressure vessels. Gas flows into the body of the filter through the inlet nozzle.
As the gas enters the body of the filter, major impurities and dirt particles will drop to the bottom
of the filter body because of the reduced rate of flow. The gas now passes through the filtration materials
towards the inside cartridge. Impurities are retained, and the purified gas flows out through the outlet
The filter medium consists of radially pleated pulp paper with a pore size of 2 microns and is guarantied
filtration performance of around 99.9%. The filtration paper is polyester-reinforced and impregnated
with phenol resin. All steel parts are galvanized.
Measured across the entire cartridge the maximum admissible pressure loss is 500 mbar. As soon as pressure
loss readings reach between 200 and 300 mbar, it is recommended to replace the filter cartridge. Cleaning a cartridge
polluted with dry particles with a jet of pressurized air is only a makeshift process, for even though the surface
of the filter may appear clean afterward, the cellulose material is full of deep-seated dust and dirt particles.
A filter that has been apparently cleaned in this fashion will have of no more than 50% of that of the new cartridge.