SEDL / STP / STP1181-EB / STP15959S

A Selection and Evaluation Protocol for Alternatives to Halogenated Hydrocarbon Solvents for Oxygen Cleaning Applications

Million, JF
Senior Chemist, Engineering Associate and Manager, Materials Engineering Laboratory, Praxair, Inc., Tonawanda, NY

McIlroy, K
Senior Chemist, Engineering Associate and Manager, Materials Engineering Laboratory, Praxair, Inc., Tonawanda, NY

Zawierucha, R
Senior Chemist, Engineering Associate and Manager, Materials Engineering Laboratory, Praxair, Inc., Tonawanda, NY

Pages: 12    Published: Jan 1993

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Abstract

Components and systems for gaseous or liquid oxygen service must be cleaned to eliminate the presence of reactive contaminants. Halogenated solvents such as 1,1,1 trichloroethane have been commonly used as preferred cleaning agents for oxygen systems; however, due to environmental and safety concerns, suitable alternatives are needed.

A substantial amount of work has been done on alternatives by various groups. However, many of these alternatives have limitations which should be identified via standardized comparative tests to identify potential problem areas. Furthermore, guidance on the use of standard tests is required.

It is believed that there is a need to establish a standard protocol for comparative testing of environmentally acceptable Chlorofluorocarbon (CFC) alternatives. A Task Force within the ASTM G-4 Committee has been addressing this matter since January, 1992.

This paper discusses issues critical to such a protocol. In addition, it presents an interim protocol suitable for dialogue between the developers of alternatives to CFC cleaning agents and users of equipment in oxygen enriched atmospheres.