Finite Filter’s large capacity ASME filter vessels have been designed specifi cally for our coalescing elements and incorporate large sump capacities and generous exit cavities for maximum performance with low differential pressures.
All units are “U” stamped and conform to ASME Section VIII standard code for pressure vessels. With flow capacities to 37,000 SCFM and optional materials of construction, most compressor source filtration requirements can be met.
ISO 8573-1 is an international standard that has become the universally accepted method for specifying and testing the purity of compressed air. ISO 8573-1 specifies a purity “class” based on contaminants in compressed air.
There are three classes that describe 1) particulate contamination concentration, 2) liquid or vaporous water contamination concentration, and 3) the contamination concentration caused by oil in the liquid, aerosol, and vapor states.
The ISO purity class is always stated using three numbers in a definite order: the solid particulate class, followed by the water contamination class, and finally the oil contamination class. Use the table below to see how the purity classes for each contaminant type are defined.
Notification as specified in ISO 8573-1
Class | Solid | Water | Oil | ||||
Maximum Particle Size | Maximum Concentration | Maximum Pressure Dew point | Maximum Concentration | ||||
μm | ppm | (mg/m3) | oF | (oC) | ppm | (mg/m3) | |
1 | 0.1 | 0.08 | (0.1) | -94 | (-70) | 0.008 | (0.01) |
2 | 1 | 0.8 | (1) | -40 | (-40) | 0.08 | (0.1) |
3 | 5 | 4.2 | (5) | -4 | (-20) | 0.83 | (1) |
4 | 15 | 6.7 | (8) | 37 | (+3) | 4.2 | (5) |
5 | 40 | 8.3 | (10) | 45 | (+7) | 21 | (25) |
6 | – | – | – | 50 | (+10) | – | – |
Note: In the pictorial examples shown above, the contribution of hydrocarbon vapors has not been taken into account in determining the oil class category.
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