How the Vacuum Degasser Work

Aug. 6, 2010 - PRLog -- Why Use the GN Vacuum Degasser in a Mud System?
An efficient degasser is essential to safe and productive drilling operations. Gas present in the well bore can
reduce the hydrostatic head in the well bore – with the potential for even greater gas influx and possible blow-out.
Regardless of the composition of the gas encountered, there can be pressure and/or volume problems in pumps and hydrocyclones.
Since gas is practically insoluble in water, it is relatively easy to detect and remove. By comparison, gas is readily soluble in oilbase muds – its detection is more difficult as well as its removal.
Atmospheric vs. Vacuum degasser
http://oilfield.gnsolidscontrol.com/the-difference-between-vacuum-degasser-and-poor-boy-degasser/
Atmospheric separations rely on impact, turbulence, agitation or a combination of these techniques to separate gas from the fluid. They possess few moving parts and have low initial cost. But their efficiency is limited and they may not be suitable for all conditions.
Vacuum degassers have more moving parts and higher initial cost. This is due primarily to the vacuum pump and attendant components. They are, however, much more efficient. Because gas volume is inversely proportional to pressure, gas bubbles surface from a fluid more rapidly under pressure. By combining impact and turbulence  features with low pressure, modern vacuum degassers prove to be fast acting and highly effective in separating dissolved gasses.
The GN Vacuum Degasser Design
The team of engineers who created the GN Solids Control have designed a degasser which improves on existing devices in several respects.  The more surface available – the more separation occurs. The GN Solids Control provides four times as much area as one popular unit, and 217% more than the closest competitor. This design improvement does not increase vessel size, tank space requirements, or weight. Traditionally, the inspection and/or maintenance of degassers requires unbolting and removing the vessel lid.
This door also permits fast and simple maintenance of the float valve assembly without removing any piping. These features, together with other design improvements, make the GN vacuum degasser the new leader in vacuum degassing for the drilling industry worldwide.
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