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Compressed air quality to ISO 8573.1 : 2001 (E)

The International Standard for compressed airquality introduces a simple system of classification for for the three main contaminants present in any compressed air system - DIRT, WATER and OIL.

To specify the quality class required for a particular application, simply list the class for each contaminant in turn.

For Example:
Compressed air to Quality Class: 2.2.2. (Dirt: 1 micron. Water: -40°C PDP. Oil: 0.1 mg/m³)

ISO8573.1 : 2001 (E)

quality class	solid particles maximum number of particles per m³			water pressure dewpoint °c (ppm. vol.) at 7 bar g	oil (including vapour) mg/m³
quality class	0.1-0.5 micron	0.5-1.0 micron	1.0-5.0 micron	water pressure dewpoint °c (ppm. vol.) at 7 bar g	oil (including vapour) mg/m³
1	100	1	0	-70 (0.3)	0.01
2	100,000	1,000	10	-40 (16)	0.1
3	-	10,000	500	-20 (128)	1.0
4	-	-	1,000	+3 (940)	5
5	-	-	20,000	+7 (1240)	-
6	-	-	-	+10 (1500)	-

Filter Grades

GRADE PF
Coarse Pre-Filtration. Particle removal down to 25 microns.

GRADE AO
High Efficiency General Purpose Protection. For the removal of particles down to 1 micron including coalesced liquid water and oil, providing a maximum remaining oil aerosol content of 0.5 mg/m³ @ 21°C.

GRADE AA
High Efficiency Oil Removal Filtration. For the removal of particles down to 0.01 micron including water and oil aerosols, providing a maximum remaining oil aerosol content of 0.01 mg/m³ @ 21°C. (Precede with Grade AO filter).

GRADE AX
Ultra High Efficiency Filtration. For the removal of particles down to 0.01 micron including water and oil aerosols, providing a maximum remaining oil aerosol content of 0.001 mg/m³ @ 21°C. (Precede with Grade AO filter).

GRADE AC & ACS
Activated Carbon Filtration. For the removal of oil vapour and hydrocarbon odours giving a maximum remaining oil content of <0.003 mg/m³ (<0.003 ppm) (excluding methane) @21°C. (Precede Grade ACS with Grade AA filter). (AC filter combines AA and AC Grades).

GRADE AR
General Purpose Dust Filtration. For the removal of dust particles down to 1 micron.

GRADE AAR
High Efficiency Dust Filtration. For the removal of dust particles down to 0.01 micron.

General Purpose Protection
(Air Quality to ISO 8573.1: Class 2.-.3)

• General Ring Main Protection
• Liquid and Solid - Bulk Contamination Removal
• Particle Removal Only in ‘Dry Systems’
• Large Pneumatic Tools
• Low Cost Automation
• Pre-Filtration for Refrigeration Type Air Dryers
• Pre-Filtration to High Efficiency Filters (Grade AA)
• Pre-Filtration to Adsorption Type Air Dryers in ‘Oil Free’ Systems
• Pre-Filtration to Air Sterilisation Filters in ‘Oil-Free’ Systems

'Oil-Free' Air
(Air Quality to ISO 8573.1: Class 1.-.2)

• ‘Oil-Free' Air
• Robotics
• Air Logistics
• Fine Pneumatic Tools
• Instrumentation
• Spray Painting
• Air Gauging
• Air Conveying
• Air Bearings
• Air Motors
• Pipeline Purging
• Temperature Control Systems
• Pre-Filtration to Adsorption Type Air Dryers in Oil Contaminated Systems
• Pre-Filtration to Air Sterilisation Filters in Oil Contaminated Systems

Critical Applications
(Air Quality to ISO 8573.1: Class 1.-.1)

• Highest Quality - Clean, Oil and Odour Free Air
• Breathing Air (Not when CO/CO₂ removal required, see our Breathing Air Purifiers)
• Blow Moulding of Plastics e.g. P.E.T. Bottles
• Film Processing
• Critical Instrumentation
• Advanced Pneumatics
• Air - Blast Circuit - Breakers
• Decompression Chambers
• Cosmetic Production
• Foodstuffs Production/Packaging
• Dairies Production/Packaging/Transport
• Breweries Production/Packaging/Transport

Reduced Dewpoint System
(Air Quality to ISO 8573.1: Class 1.4.1)

Where dewpoint is not required to be less than 3-10°C.

Extremely Low Dewpoint System
(Air Quality to ISO 8573.1: Class 1.1.1 and 1.2.1)

Where totally dry compressed air is required dewpoint between -40°C and -70°C. To stop corrosion from compressed air at 20°C and 7 bar g. A -30°C DP is the minimum requirement.

Terminal Filtration

*Where no main line filters are fitted or where the length of the pipe from the main filters is excessive. Grade AO pre-filters should be installed before the filters shown.

• Spray painting booths
• Breathing air
• Advanced pneumatics
• Instrumentation
• Blow guns
• Measuring equipment
• Gauging equipment
• Hand tools

Installation Hints

1. Generally install filters downstream of aftercoolers and air receivers at the lowest installation temperature and as close to the point of application as possible This ensures that in wet systems as much water and oil vapour has condensed out as possible which can be removed by the coalescing filters. Installing close to the application reduces the risk of pipe scale downstream or the filters contaminating the filtered air. Please refer to above installation hints.

2. Filters should not be installed downstream of quick opening valves and should be protected from possible reverse flow or other shock conditions.

3. It may he necessary to install a combination of main line filtration near the compressor installation before entry to the ring main and install terminal filtration at the critical points. Remember especially in existing installations the contamination already in the pipe system downstream of the filters will take a long time to disappear and probably never will completely.

4. Purge all lines leading to the filters before installation and connection to the final application to be protected

5. Install filters in a vertical position ensuring that there is sufficient room below the filters to facilitate element change.

6. Avoid by-pass lines whenever possible as contamination may leak through valves and by-pass the filters.

7. Provide a facility to drain away collected liquids where applicable from the filter drains via suitable tubing taking care that no restrictions are caused.

8. Install domnick hunter differential pressure gauges and kits to indicate the pressure drop across the filters. This will give an idea of the filter element condition (except Grade AC or ACS).

9. domnick hunter mounting kits are available for filter sizes up to 0620G. Care should be taken with larger filters to see that they are properly supported in the pipe line.

10. If you have a problem on filter selection or installation please contact the domnick hunter Technical Sales Department or our representatives We will be pleased to help you in selecting the installation for your requirements.