SF6 Recycling Guide; Electra No. 173 (1997), p. 43-69
Summary
This document reviews all significant aspects of the recycling of SF6 gas used in electrical power equipment. It gives recommendations for the design of electrical power equipment utilising SF6 to allow ease of gas recycling, proposes appropriate gas handling and recycling procedures to be applied and describes essential features of gas handling and recycling equipment. It identifies the origins, quantities and deteriorating effects of contaminants to be expected in SF6 used in electrical power equipment and proposes purity standards to which SF6 gas should be reclaimed to allow its safe reuse.
Methods for verifying the quality of the reclaimed gas are also given as are proposals for transportation of the gas with varying degrees of contaminants. Additionally, a final disposal concept is proposed by which SF6 can be removed from the ecocycle and transformed into environmentally compatible substances. Finally, the document gives general recommendations to be applied when handling SF6 with further specific recommendations for electrical power equipment manufacturers, users and for SF6 producers. A number of issues still require resolution. These are listed as recommendations for further work.
This document is also available as CIGRE technical brochure no.117.