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Gas filters

Commonly used gaseous substances contain small fragments of solid particles that affect the lifespan of gas appliances. If a larger amount of mechanical impurities is present in the gas pipeline, appliances wear out more quickly, and clogging can lead to damage or complete destruction. Gas filters capture mechanical impurities, thereby improving the quality of operating substances. Filters are thus an ideal solution wherever a low content of solid particles is required. It is recommended to install them before boiler rooms, gas meters, gas shut-off valves, burners, etc. When selecting a gas filter, it is important to consider the amount of solid substances the filter can capture and choose the type of filter with regard to the operating gas. Common gas filters are available for heating gases, gaseous fuels including butanes and their mixtures, air, and other non-aggressive gases, but there are also variants for biogas and coke oven gas, which contain a higher proportion of mechanical impurities.

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.