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ISO 8573 Compressed Air Quality

ISO 8573 is the group of international standards relating to the quality of compresed air. These documents are broken down into nine parts, part one specifies the quality requirements of the compressed air and parts two to nine specify the methods of testing for a range of contaminates.

ISO 8573.1

Purity levels for the main contaminates are shown in seperate tables, however below we have cobined all three to make it easier to follow.

Solid Particles
Water      
 
Oil
Purity Class
 
Max No. of particles per m3
 
Particle Size
Concentration
   
Total Oil
 
0.1-0.5 micron
0.5-1 micron
1-5 micron
micron
mg/m3
Pressure Dewpoint
g/m3
mg/m3
   
0
NA*
NA*
NA*
NA*
NA*
NA*
NA*
NA*
1
100
1
0
-
-
-70c
-
0.01
2
100,000
1000
10
-
-
-40c
-
0.1
3
-
10,000
500
-
-
-20c
-
1
4
-
-
1000
-
-
+3c
-
5
5
-
-
20,000
-
-
+7c
-
-
6
-
-
-
5
5
+10c
-
-
7
-
-
-
40
10
-
0.5
-
8
-
-
-
-
-
-
5
-
9
-
-
-
-
-
-
10
-

* As specified by the equipent user or supplier

When writing a a purity specification it should be in the form ISO 8573.1 : 2001 Class S.W.O
For example ISO 8573.1 : 2001 Class 1.2.1 - would mean class one for solid particles, class two for water, class one for oil.

Equipment required to meet the grades

The following table shows what equipment is required to meet each grade specified above

Solid Particles
Solid Particles
Water
Oil
Purity Class
 Wet Particulate
Dry Particulate
Vapour
Total Oil
1
Pre-filter, Micronic filter, & High efficiency filter
AR Pre filter, AAR Micronic filter, High efficiency filter
Adsorption dryer
Pre-filter, Micronic filter & Activated carbon filter
2
Pre-filter, Micronic filter
AR Pre filter, AAR Micronic
Adsorption dryer
Pre-filter, Micronic filter
3
Pre-filter
AR Pre filter
Adsorption dryer
Pre-filter
4
Pre-filter
AR Pre filter
Refrigeration dryer
Pre-filter
5
Pre-filter
AR Pre filter
Refrigeration dryer
-
6
-
-
Refrigeration dryer
-

General purpose oil free air is considered ISO 8573.1 Class 2.4.2
In a typical environment this is achieved by installing a pre-filter, refrigeration dryer, micronic filter.

For further advice and information on current standards for compressed air systems please contact us here

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