Abu Dhabi Gas Liquefaction Company Ltd Job Training Mechanical Technician Course Module 9 Compressors
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- 1 Introduction
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Inter-stage
Between stages. Leaf spring Spring made from a flat or slightly curved strip of metal. Process gas Gas being processed in the LNG Plant. (See also feed gas.) Side-stream Gas entering or leaving a compressor between stages. Upstream Located before something, against the direction of flow. Vapour recovery Removal and re-liquefaction of vapour from LPG held in tanks. Personnel & Training Division Job Training—Mechanical Technician Compressors/Rev. 0.0 Page 6 of 90 1 Introduction The main purpose of a compressor is to increase the pressure of a gas. ADGAS uses compressors: • to supply compressed air for use throughout the plant • to raise the pressure of process gas (or feed gas) received from the ADMA gas-oil separation plant going to Trains I and II for liquefaction • in refrigeration processes that cool gas to liquefy it • to re-compress boil-off-gas (LNG) and vapour recovery (LPG) in the STOREX area • in gas turbines, to increase the pressure if air entering the turbine Compressors are also needed where gas has to be moved through long pipelines. As gas flows along a pipeline, some of its pressure energy changes to heat energy because of fluid friction. This results in a loss of pressure. Compressors are located at points along the pipeline to boost the pressure. You can think of compressors as ‘gas pumps’. They do a similar job to a pump, have similar components and can often look like pumps. Most of the compressors on the ADGAS plant are centrifugal compressors. They have the same principal of operation as a centrifugal pump but run at much higher speeds than a pump. They are often driven directly by turbines. If they are driven by electric motors, a gearbox may be needed to increase the drive speed to the compressor. Reciprocating compressors are used mainly in the STOREX area. The only axial-flow compressor on the plant is located in the gas turbine drive for an electrical generator. Other common types of compressors are described in this module to give you an awareness of the full range available. To boost something is to increase it. Personnel & Training Division Job Training—Mechanical Technician Compressors/Rev. 0.0 Page 7 of 90 Download 0.5 Mb. Do'stlaringiz bilan baham: 
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