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April 11 - April 17, 2011

How clean must the compressed-air supply be for blast cleaning, blow down and painting? How is cleanliness of the air determined?

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Selected Answers

From Pongpawut Onkaew of Akzo Nobel Coatings on June 16, 2011:
     Conduct a blotter test in accordance with ASTM D 4285, Acceptance criteria is no visible oil, water or other contamination  allowed.

From Aldrin Cordovez of Kuwait Oil Company on May 28, 2011:
     A compressed air free from any form of contaminants is necessary before its usage. Its cleanliness shall be checked using the blotter test method. Any traces of water, oil and foreign matters shall not be visible on the blotter test paper before it can be utilized for such purposes.

From Gary M of T & G Services on April 14, 2011:
     It is critical that the air supply is not contaminated with oil or water during all the processes you listed. To ensure that the air is dry and clean, conduct a blotter test prior to starting each work shift and at reasonable intervals throughout the day. If contaminants are evident on the blotter test, all filters and driers that should be present in the supply line must be opened and blown out until the air is clean and passes the blotter test. If you can't achieve a passing test, added filters can be used, or the air source should be replaced.

From Carl Havemann of on April 14, 2011:
     There are two contaminants to test for, oil and moisture. Check for oil using the Drager Oil Mist 1/a tube, Ref 6733031. Acceptance criteria is that no oil is allowed. To check for moisture, blow the compressed air onto clear glass for 30-60 seconds, then check for condensation. Acceptance criteriais that no moisture allowed. [A 5-minute test is too long, in my opinion]

From Lee Edelman of Independant on April 13, 2011:
     The air supply must be free of oil, water and other contaminants. Cleanliness is checked by doing a blotter test at the air manifold. The air supply should have moisture traps in-line and a proper aftercooler system.

From remko tas of Futuro SRL on April 13, 2011:
     Expose a sheet of white paper (taped to a board) at a distance of 1 meter for 1 minute to the airflow from the compressed air supply.There should be no visible oil stains on the white paper.

From John Gascoigne of Puget Sound Coatings on April 12, 2011:
    The air needs to be clean. Test for cleanliness by blowing into a white rag or a clear glass or plastic container for 5 minutes.

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