The CDS / StatoilHydro Degasser is an in line device which separates gas and liquids. It has no moving parts and requires no power. Due to a very effective but simple control system it reaches very high separation regardless of flow fluctuations. The separation efficiency is above 99.5% gas from liquid, while the separated gas is 100% free of liquid.

The diameter of the Degasser is generally about the same diameter as the line into which it will be installed. Because of this and the fact it can be certified as a piece of pipe as opposed to a pressure vessel the installation cost is low and maintenance is minimal.

Applications:

• Increase the capacity of existing separators by taking out the gas upstream of them.
• Reduce the size of new separator vessels
• Debottlenecking of multiphase lines
• Debottlenecking of gas limited facilities

Advantages:

• In line
• No (big) vessels necessary
• Low installation costs
• Minimal maintenance costs
• Very flexible to flow fluctuations
• Separation of gas from liquid > 99.5%
• Separated gas is 100% free of liquid
• Gas can go straight to compressors or flare with no further processing required.

In the Degasser the gas and liquid are separated when the multiphase fluid enters the separator where a stationary swirl element causes the flow to rotate. This rotation forces the liquid to flow along the outer wall with the gas flowing in the centre. The gas is removed from the centre into a scrubber section along with a portion of the liquid for control purposes. This liquid subsequently rejoins the gas free liquid flow leaving the Degasser after the main flow has passed through a counter swirl intended to provide pressure recovery and stop the swirl to prevent downstream vibrations.