International regulations and guidelines
Kyoto Protocol / Paris Agreement
SF6 gas is listed in the Kyoto protocol [external] as one of the six greenhouse gases subject to monitoring. SF6 has to be used in closed systems in order to avoid emissions. 194 member states agreed to extend the Kyoto protocol until 2020 with the aim of reducing the emission of greenhouse gases.
The Paris Convention agreed to reduce climate-damaging greenhouses gases under the United Nations Framework Convention on Climate Change (UNFCCC) [external] as of 2020. 195 member states negotiated and adopted this agreement on the twenty-first session of the Conference of the Parties under the framework convention on climate change in Paris on 12 December 2015.
IEC 62271-4 directive
This directive stipulates SF6 gas recovery down to a final vacuum of < 20 mbar. The IEC requirements are exceeded by far when using DILO devices as DILO service carts enable a final vacuum of < 1 mbar depending on the type of device.
IEC 60480 guideline
This guideline stipulates the limit values for the re-use of SF6 gas in medium and high voltage switchgear. The limit values of the IEC guideline for re-use of SF6 gas are:
Medium voltage: -23 °C* for equipment with an operating pressure of < 2 barabs
High voltage: -36 °C* for equipment with an operating pressure of > 2 barabs
* measured at ambient pressure