[5] The vacuum pump moves the escaping gas from the vessel discharging it to the rig's flare or environmental control system.
[7] It operates at a low pressure to maximise the amount of gas (eg methane, carbon dioxide) that is removed from the water stream.
[8] It can be located immediately downstream of the production separators prior to low pressure water treatment system such as dissolved gas flotation.
In this case the degasser may also act as a surge drum to ensure a steady flow of water to the treatment plant.
[4] In either case the degasser provides sufficient residence time to allow dissolved or entrained gases to be released from the produced water stream.