Abu Dhabi Gas Liquefaction Company Ltd Job Training Mechanical Technician Course Module 9 Compressors
Figure 5.13: Vertically-split Barrel Casing
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- 5.1.5 ADGAS Centrifugal Compressors
- Feed Gas Compressors
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Figure 5.13: Vertically-split Barrel Casing
Diffuser vanes Diaphragms Personnel & Training Division Job Training—Mechanical Technician Compressors/Rev. 0.0 Page 56 of 90 5.1.5 ADGAS Centrifugal Compressors ADGAS uses centrifugal compressors to: • raise low-pressure feed gas to 780psig/52barg for the liquefaction process in Trains I and II • compress refrigerants (MCR, propane, etc.) as part of the gas liquefaction cooling process • supply air for process, instruments and service to all areas except Sulphur STOREX Feed Gas Compressors Train III receives only high-pressure gas (780psg/52barg) directly from the gas fields. This does not need to be compressed before starting the liquefaction process. Trains I and II receive feed gas either at high pressure (780psg/52barg), direct from the gas fields or at lower pressures from ADMA gas-oil separation plant. Gas comes from different stages of the ADMA gas-oil separation process at pressures of 0psig (atmospheric), 35psig, 75psig and 230psig. All these have to be compressed to the same high pressure (780psg/52barg) before starting the liquefaction process. Two booster compressors connected in parallel take gas coming from ADMA at atmospheric pressure. They raise this gas pressure from 0psig to 35psig. This gas then goes to Train I and Train II. Each train has a feed gas compressor that increases the pressure in three compressor process stages to a final pressure of 780psg/52barg. Note: ADGAS uses barg units for pressures in the liquefaction process; psig units are used for feed gas entering the system from ADMA. The feed gas compressor process stages also take gas directly from ADMA gas-oil separation plant at 35psig, 75psig and 230psig. These enter the compressors as side streams. The feed gas compression process is shown in Figure 5.15. Personnel & Training Division Job Training—Mechanical Technician Compressors/Rev. 0.0 Page 57 of 90 Download 0.5 Mb. Do'stlaringiz bilan baham: 
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