Gas filters

Special filters are used in gas pipelines, which, in addition to a stainless steel mesh, are equipped with a very fine insert for capturing mechanical impurities. Due to long-term durability, polypropylene fibre windings are preferred, but foam inserts offer greater tightness and flexibility. Choosing a gas filter should therefore be based on the amount of operating substance passing through and the expected level of contamination. The density of the insert is then selected according to the diameter of the smallest particles to be captured (this data is given in micrometres [µm]). An important criterion for selecting a gas filter is also the pressure loss, which is the filter's resistance to the flowing gas. Its value increases depending on the flow rate and the filter's clogging with impurities.

Clogging of the filter insert reduces the amount of substance passing through, which can subsequently lead to improper functioning of appliances (i.e., a drop in pressure with higher consumption), therefore, when clogged, it is necessary to replace it. Most gas filters also allow the use of a filter insert for liquid substances.

Gas filters are also available in variants for biogas and coke oven gas, where a higher content of contaminating particles is more likely. The connection of the filter to the distribution is solved by thread or flange, depending on the type of gas filter.