Delta Compression & Equipment

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Separation

Production Unit Systems

All natural gas wellstreams contain water vapor as they leave the reservoir. In many instances, free water is produced along with the natural gas. Natural gas cools as it travels up the wellbore to the surface as a result of pressure reduction and conduction of heat through the pipe to cooler formations. Therefore, since the ability of gas to hold water vapor decreases as the gas temperature decreases, natural gas is nearly always saturated with respect to water vapor when it reaches surface equipment. Additional cooling of the saturated gas will cause the formation of free water. Should the natural gas further cool into the hydrate range, hydrates will form and serious equipment damage and stoppage of flow will occur. Thus it is understandable why it is important to remove water vapor from natural gas. The process for removal of water vapor from natural gas is known as DEHYDRATION. It is imperative that you use a coalescing separator (filter separator) downstream from compression and it is highly recommended that you have an upstream coalescing separator (filter separator) in all applications to protect the glycol from contamination. Reasons for dehydrating:

There are three principal reasons for dehydrating natural gas. These are:

prevention of line plugging due to formation of hydrates
prevention of reduction of line capacity due to formation of free water (liquid)
elimination or retarding of corrosion in the pipeline.

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