Discussion on Question 43 on Page 127 of “Ethylene Technology Q&A”
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Original question: Why are high-level oil tanks installed for the three streams (pyrolysis gas, ethylene, propylene)? Answer: When the lubricating oil pressure is low, before the auxiliary oil pump starts, the high-level oil tank for lubricating oil supplies oil to the main lubricating oil pipeline, thereby reducing the extent of the drop in lubricating oil pressure and ensuring that it remains above the interlock value. This prevents the compressor from shutting down due to excessively low oil pressure. The above is the original question along with its solution. Please analyze whether there are any issues
It is not to prevent the vehicle from stopping due to low oil pressure, but rather to protect the compressor bearing shells and avoid seizure; in other words, the use of a high-level oil sump is a safety measure, not a production-related one
As I recall, high-position oil seems not to have this function
Yes, the high-level oil tank should provide the lubricating oil required for the coasting time after the unit stops, and it has little to do with the lubricating oil pressure. The compiler of this question made a mistake.
That’s right; if we had this feature, we wouldn’t experience the unit shutting down prematurely due to a failure in the turbine oil pump.