Question: The air filter element needs to be replaced when the pressure difference exceeds 0.7 bar. Where does this 0.7 bar standard come from?
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0.7 bar = 10 psi – is this done to round to an integer for easier memorization, or is there some standard behind it, or is it calculated?
Is it the filter after the air compressor?
Without understanding the structure of air filters, there are two situations regarding the pressure difference allowed by the filter: when this pressure difference reaches a certain level, it can either cause damage to the filter or result in insufficient delivery capacity.
Basically, in order to maintain stable operation of the equipment, manufacturers recommend certain operating conditions, including the pressure difference across the filter
It is a criterion that specifies when the air filter element needs to be replaced. It means that if the pressure difference exceeds 0.7 bar, there will be insufficient air flow or signs of blockage, requiring the replacement of the filter element
Thank you all. Many manufacturers follow this standard; on some differential pressure gauges, it is indicated as green for 0-0.7, and red thereafter； I’d like to know how this standard came about
Is the pressure drop of 0.7 bar mentioned by the poster really that high? Clause 3.0.4 of GB 50029-2014 \"Code for Design of Compressed Air Stations\" stipulates that: for the suction filter or suction filtering device of air compressors, the filtration efficiency for particles with a size of 15μm or greater should be no less than 99.5%, and the pressure drop under clean conditions should not exceed 800 Pa ； For the suction filter or suction filtering device of a centrifugal compressor, the filtration efficiency for particles with a size of 2μm or larger should be no less than 99.5%, and the pressure drop under clean conditions should not exceed 500 Pa. This is a relatively normal pressure drop value; if the pressure drop across a filter is already 70 kPa, then the operation and maintenance of such a device are of poor quality
It is the pipeline filter behind the screw air compressor