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Compressors in Offshore Application

Longer Life for Old Gas-Fields: Jet Compressors helps Offshore Gas Production to Overcome Pressure Problems

| Editor: Dominik Stephan

Gea designed, manufactured and delivered a gas jet compressor system for an offshore platform in the North Sea.
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Gea designed, manufactured and delivered a gas jet compressor system for an offshore platform in the North Sea. (Picture: Gea)

When mechanical compressors are not enough: Specialist company GEA designed and delivered an new gas jet compressor system for an offshore platform in the North Sea which shall help to overcome the problems with gas field at the end of their production lifetime.

Düsseldorf/Germany – As production continues, the pressure of the natural gas decreases, so that it can no longer be delivered economically using mechanical compressors. Therefor, GEA designed, manufactured and delivered a gas jet compressor system for an offshore platform in the North Sea consisting of a jet pump (ejector) with a total length of about 4.5 m and silencers to reduce the sound pressure level. At a new drilled well natural gas is available with a pressure of up to 600 bar.

Gas jet compressors are perfect to increase the natural gas pressure and to allow extending the use of the installed mechanical compressors. In this way, the gas field life is prolonged. The system compresses a low-pressure natural gas (8 barg) by using a high-pressure natural gas (90 barg) to an intermediate gas pressure (12 barg). GEA managed to increase its portfolio by designing the ejector-body for 137 barg – and on the motive side for 213 barg.

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The material of construction is corrosion resistant and corrosion tested Duplex-stainless steel, which is coated with sprayed Aluminum. Ejectors are reliable in operation at low operating costs. They are almost maintenance-free because they are of simple construction, having no moving parts. Almost any vacuum duty can be accommodated including large suction flows.

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