… the „mother“ of all compressed air treatment standards
The subject of the ISO 8573 series is the compressed air purity at any specific point of a compressed air system (downstream after-cooler). The ISO 8573 series defines standardized and manufacturer independent measuring methods for contaminations in compressed air and methods to express the required or measured compressed air purity.
ISO 8573-1 – a Standard of Compressed Air Quality
It is group of international standards concerning compressed air quality.
Standard consists of 9 parts. Nr. 1 defines quality requirements on compressed air,
parts Nr. 2 – 9 describe testing methods of many contaminants in the air.
PDP… pressure dew point
The individual parts of the standard deal with:
8573-1. Contaminants and purity classes
8573-3. Test methods for measurement of humidity
8573-4. Test methods for particle content
8573-5. Test methods for oil vapour and organic solvent content
8573-6. Test methods for gaseous contaminant content
8573-7. Test methods for viable microbiological contaminant content
8573-8. Test methods for solid particle content by mass concentration
8573-9. Test methods for liquid water content
The compressed air purity for the three major contaminants in compressed air, expressed as ISO 8573-1 purity classes, is stated in the following way:
ISO 8573-1:2010 [ A : B : C ]
A – is the purity class for particles
B – is the purity class for humidity and liquid water
C – is the purity class for the total oil content
When a class for any of the three major contaminants is not specified, the designation shall be replaced by a hyphen, e.g.
ISO 8573-1:2010 [ A : – : C ]
for a compressed air purity without any requirements to the humidity or water content.
When a specified contamination level falls within class X, then the highest concentration shall be given in round brackets, e.g.
ISO 8573-1:2010 [ A : X(15) : C ]
for a maximum concentration of liquid water of 15 g/m³.
When a specified contamination level falls within class 0, IT IS MANDATORY to state the highest allowable concentration (which must be better than defined for class 1), e.g.
ISO 8573-1:2010 [ 0(1000:100:1) : 0(-80) : 0(0,001) ]
ISO 8573-1:2010 [ 0 : 0 : 0 ]
Maximum particle content: 1000 pcs/m³ (0,1-0,5µ), 100 pcs/m³ (0,5-1µ), 1 pcs/m³ (1-5µ)
Maximum humidity : -80°C (PDP)
Maximum total oil content: 0,001 mg/m³
The designation itself is not defined for class 0, so it can be expressed in separate ways.