| 摘要 |
<p>A method of testing for contaminating mineral oil in a sample of synthetic ester lubricating oil from mechanical vapour recompression type heat transfer equipment which is to be retrofilled with hydrohalocarbon working fluid, comprises mixing a predetermined quantity of the synthetic ester lubricating oil with a predetermined quantity of a polar liquid or a mixture of polar liquids and determining whether the resulting mixture is clear or turbid, a clear mixture indicating that the concentration of contaminating mineral oil in the synthetic ester lubricant is below the maximum tolerable concentration and that the system can therefore be safely retrofilled with the hydrohalocarbon working fluid; and a turbid mixture indicating that the concentration of contaminating mineral oil is above the maximum tolerable concentration and that the system must therefore be reflushed with synthetic ester lubricant to further reduce the mineral oil contamination.</p> |
