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Opening the System
7. Drilling and tapping of process pipe.
8. Connect dry nitrogen and equalize the pressure.
9. Open the system with capillary tube scissors and remove
the drilling and tapping valve. The tongs are removed
from the used filter drier and dry nitrogen (N2) is now blown
through the process pipe and into the system (see Section
2.1.1. + 2.1.: R600a).
23.