Oil Return To The Multistage Systems
Whenever two or more compressors are interrelated there is no guarantee that the oil return to the individual compressors will take place in the right volumes. Therefore, some of the ways to ensure the proper distribution of oil for all compressors must be ensured. When compressors are connected in parallel, the oil can be maintained at the same level in all compressors accession crankcases, as described. However, this method of oil requires the alignment that the pressure in the crankcase all compressors be exactly the same. In direct staging systems, considerably above, there is pressure in the crankcase each higher-stage compressor. Therefore, the high level of the compressor power of their oil to the alignment of the line of low pressure, low steps crankcases. Therefore, diis method is not applicable in systems where compressors are connected in series.
One of the most common methods of alignment oil level in the crankcase compressors connected in series. Oil separator installed in the discharge line of high compressor stage.
Oil, which is separated from the steam injection is returned to the suction inlet of the high stage compressor. Because the oil is collected from the discharge line of high stage compressor contains a lubricant from all of the previous stages, the high side of a float valve is installed in tlie spacer high stage compressor. This strategy maintains the desired level of oil in a high stage of the crankcase of the compressor by drain excess fat on the next lower stage compressor oil wrapping...
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