CDR Volkov & FE-1 Kononenko spent most of their workday with equipment preparations in the DC1 'Pirs' Docking Compartment for the second Orlan EVA (#20) on 7/15. In the Lab, the FE-2 (Chamitoff) serviced the US OGS (Oxygen Generation System), removing the PWR (Payload Water Reservoir) from in front of the WDS (Water Delivery System) and replacing it with a filled PWR. Like the Russian Elektron, OGS produces O2 from water by electrolysis, dumping the also generated H2 (hydrogen) through venting. - NASA ...
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